def set_wherewhen(self):
'''
Add WhereWhen section to voevent object.
'''
# use astropy to convert raj and decj angles to degrees
skcoord = SkyCoord(ra=self.event['raj'], dec=self.event['decj'],
unit=(u.hourangle, u.deg))
raj = skcoord.ra.deg
decj = skcoord.dec.deg
# ra: right ascension; dec: declination; err: error radius
if self.event['beam_semi_major_axis']:
vp.add_where_when(
self.v,
coords=vp.Position2D
(ra=raj,
dec=decj,
err=self.event['beam_semi_major_axis'],
units='deg',
system=vp.definitions.sky_coord_system.utc_fk5_geo),
obs_time=pytz.utc.localize(self.event['utc']),
observatory_location=self.event['telescope'])
else:
# some of the original database entries do not have a value
# for beam_semi_major_axis, set to 0
vp.add_where_when(
self.v,
coords=vp.Position2D
(ra=raj,
dec=decj,
err=0, units='deg',
system=vp.definitions.sky_coord_system.utc_fk5_geo),
obs_time=pytz.utc.localize(self.event['utc']),
observatory_location=self.event['telescope'])
def setUp(self):
self.v = vp.Voevent(stream='voevent.soton.ac.uk/TEST',
stream_id='100',
role='test')
self.coords1 = vp.Position2D(ra=123.456, dec=45.678,
err=0.1,
units='deg', system='UTC-FK5-GEO'
)
self.coords2 = vp.Position2D(ra=355.456, dec=-57.678,
err=0.1,
units='deg', system='UTC-FK5-GEO')
def create_basic_location_alert(id, role, description,
ra, dec, err,
event_time):
"""
Create a skeleton VOEvent with a WhereWhen pointing at the given coords.
Args:
id (dict): Dictionary containing identity details,
as defined in :mod:`fourpiskytools.identity`
stream (string): Stream name, e.g. 'ProjectFooAlerts'
role (string): 'observation', 'prediction','utility' or 'test'
description (string): Description string inserted into 'What' section.
ra (float): Right ascension (J2000 degrees)
dec (float): Declination (J2000 degrees)
err (float): Positional error-radius (degrees)
event_datetime (datetime.datetime): Time of event (UTC).
"""
stream = id[id_keys.stream]
v = create_skeleton_voevent(id, stream, role)
v.What.Description = description
vp.add_where_when(v,
coords=vp.Position2D(ra=ra, dec=dec, err=err,
units='deg',
system=vp.definitions.sky_coord_system.fk5),
obs_time=event_time,
observatory_location=vp.definitions.observatory_location.geosurface)
return v
def test_get_event_position(self):
known_swift_grb_posn = vp.Position2D(ra=74.741200,
dec=-9.313700,
err=0.05,
units='deg',
system='UTC-FK5-GEO')
p = vp.get_event_position(self.swift_grb_v2_packet)
self.assertEqual(p, known_swift_grb_posn)
self.assertIsInstance(p.ra, float)
def assign_test_client_and_initdb(self, flask_test_client,
fixture_db_session):
self.c = flask_test_client # Purely for brevity
n_packets = 17
packets = heartbeat_packets(n_packets=n_packets)
for counter, pkt in enumerate(packets, start=1):
packet_dec = 180.0 / n_packets * counter - 90
coords = vp.Position2D(
ra=15, dec=packet_dec, err=0.1,
units=vp.definitions.units.degrees,
system=vp.definitions.sky_coord_system.utc_icrs_geo)
# print "Inserting coords", coords
vp.add_where_when(
pkt,
coords=coords,
obs_time=iso8601.parse_date(pkt.Who.Date.text),
observatory_location=vp.definitions.observatory_location.geosurface
)
self.packets = packets
self.ivorn_dec_map = {}
for pkt in self.packets:
posn = vp.get_event_position(pkt)
self.ivorn_dec_map[pkt.attrib['ivorn']] = posn.dec
fixture_db_session.add(Voevent.from_etree(pkt))
# In[ ]:
v.What.append(vp.Param(name="mag", value=18.77, ucd="phot.mag"))
h_m = vp.Param(name="hist_mag", value=19.62, ucd="phot.mag")
h_s = vp.Param(name="hist_scatter", value=0.07, ucd="phot.mag")
v.What.append(vp.Group(params=[h_m, h_s], name="historic"))
# ##Adding ``WhereWhen`` details##
# Now we need to specify where and when the observation was made. Rather than trying to specify a position for Gaia, we'll just call it out by name. Note that Gaia don't provide errors on the position they cite, so we're rather optimistically using 0:
# In[ ]:
vp.add_where_when(v,
coords=vp.Position2D(
ra=168.47841,
dec=-23.01221,
err=0,
units='deg',
system=vp.definitions.sky_coord_system.fk5),
obs_time=datetime.datetime(2014, 11, 7, 1, 5, 9),
observatory_location="Gaia")
# In[ ]:
## See how much element creation that routine just saved us(!):
# print(vp.prettystr(v.WhereWhen))
# ##Adding the ``How``##
# We should also describe how this transient was detected, and refer to the name
# that Gaia have assigned it. Note that we can provide multiple descriptions
# (and/or references) here:
def create_grb_voevent(grb_dic, conf_vo, what_com, atable):
"""
Create VO event with observation plan for a given telescope in the network
:param gw_dic: dictionary with GRB infos
:param conf_vo: dictionary to be used to fill header of VO event
:param what_com: dictionary with common infos needed for VO creation
:param atable: astropy table with observation plan and meta data
:return: voevent object
"""
# get telescope name and role, will be used several time
tel_name = what_com['tel_name']
obs_mode = what_com['obs_mode']
voevent = basic_grb_voevent(grb_dic, conf_vo, what_com)
#GBM ground or final position
if grb_dic["Packet_Type"] == 112 or grb_dic["Packet_Type"] == 115:
pixloc = vp.Param(name="Loc_url",
value=str(grb_dic["skymap"]["localization_name"]),
ucd="meta.ref.url",
dataType="string")
pixloc.Description = "URL to retrieve location of the healpix skymap"
voevent.What.append(pixloc)
if tel_name != "":
name_tel = vp.Param(name="Name_tel",
value=str(tel_name),
ucd="instr",
dataType="string")
name_tel.Description = "Name of the telescope used for the observation strategy"
voevent.What.append(name_tel)
if atable and atable[0]:
# now prepare observation plan or galaxies list
fields = objectify.Element("Table", name="Obs_plan")
fields.Description = "Tiles for the observation plan"
# first field is the identificaiton of the field
# it will be different between tiling and galaxy targetting
if obs_mode == "Tiling":
field_id = objectify.SubElement(fields,
"Field",
name="Field_id",
ucd="",
unit="",
dataType="string")
field_id.Description = "ID of the field of FOV"
tel_obsplan = np.transpose(
np.array([
atable['rank_id'], atable['RA'], atable['DEC'],
atable['Prob']
]))
else:
field_id = objectify.SubElement(fields,
"Field",
name="Gal_id",
ucd="",
unit="",
dataType="string")
field_id.Description = "ID of the galaxy"
# For galaxie we will uniformize how we name them based on catalogs
gal_id = utils_too.uniformize_galnames(atable)
tel_obsplan = np.transpose(
np.array([
gal_id, atable['RAJ2000'], atable['DEJ2000'],
atable['S']
]))
# right_asc = objectify.SubElement(fields, "Field", name="RA", ucd="pos.eq.ra ", unit="deg", dataType="float")
right_asc = objectify.SubElement(fields,
"Field",
name="RA",
ucd="pos.eq.ra ",
unit="deg",
dataType="float")
right_asc.Description = "The right ascension at center of fov in equatorial coordinates"
dec = objectify.SubElement(fields,
"Field",
name="Dec",
ucd="pos.eq.ra ",
unit="deg",
dataType="float")
dec.Description = "The declination at center of fov in equatorial coordinates"
os_grade = objectify.SubElement(fields,
"Field",
name="Os_score",
ucd="meta.number",
unit="None",
dataType="float")
os_grade.Description = "Gives the importance of the tile/galaxy to observe"
data = objectify.SubElement(fields, "Data")
# loop on the observation plan
# put a limit to 500 fields otherwise get an error when sending a VO event
for i in np.arange(min(500, len(tel_obsplan))):
table_row = objectify.SubElement(data, "TR")
for j in np.arange(len(tel_obsplan[i])):
# objectify.SubElement(TR, "TD",value=str(Tel_dic["OS"][i][j]))
objectify.SubElement(table_row, 'TD')
table_row.TD[-1] = str(tel_obsplan[i][j])
voevent.What.append(fields)
grb_dic["dateobs"] = grb_dic["dateobs"].replace(tzinfo=pytz.utc)
vp.add_where_when(voevent,
coords=vp.Position2D(
ra=grb_dic["ra"],
dec=grb_dic["dec"],
err=grb_dic["error"],
units='deg',
system=vp.definitions.sky_coord_system.utc_fk5_geo),
obs_time=grb_dic["dateobs"],
observatory_location=grb_dic["inst"])
# Check everything is schema compliant:
vp.assert_valid_as_v2_0(voevent)
return voevent
def generate_voevent(self, feed_id):
rowdict = self.event_id_data_map[feed_id]
params = rowdict['param']
urls = rowdict['url']
stream_id = self.feed_id_to_stream_id(feed_id)
v = create_skeleton_4pisky_voevent(substream=self.substream,
stream_id=stream_id,
role=vp.definitions.roles.observation,
date=datetime.datetime.utcnow()
)
vp.add_how(v, references=vp.Reference(uri=self.url))
v.How.Description = "Parsed from ASASSN listings page by 4PiSky-Bot."
timestamp_dt = asassn_timestamp_str_to_datetime(
params[AsassnKeys.detection_timestamp])
posn_sc = SkyCoord(params['ra'], params['dec'],
unit=(u.hourangle, u.deg))
# Couldn't find a formal analysis of positional accuracy, but
# http://dx.doi.org/10.1088/0004-637X/788/1/48
# states the angular resolution as 16 arcseconds, so we'll go with that.
err_radius_estimate = 16 * u.arcsec
posn_simple = vp.Position2D(ra=posn_sc.ra.deg,
dec=posn_sc.dec.deg,
err=err_radius_estimate.to(u.deg).value,
units=vp.definitions.units.degrees,
system=vp.definitions.sky_coord_system.utc_icrs_geo,
)
vp.add_where_when(
v,
coords=posn_simple,
obs_time=timestamp_dt,
observatory_location=vp.definitions.observatory_location.geosurface)
asassn_params = [vp.Param(key, params[key]) for key in
(AsassnKeys.id_asassn,
AsassnKeys.id_other,
AsassnKeys.detection_timestamp,
AsassnKeys.ra,
AsassnKeys.dec,
AsassnKeys.spec_class,
AsassnKeys.comment,
)
if key in params
]
if AsassnKeys.mag_v in params:
asassn_params.append(
vp.Param(AsassnKeys.mag_v, params[AsassnKeys.mag_v],
unit='mag', ucd="phot.mag",
)
)
if AsassnKeys.id_other in urls:
asassn_params.append(
vp.Param(AsassnKeys.id_other,
urls[AsassnKeys.id_other][0][0])
)
asassn_urls = [vp.Param(key, urls[key][0][1]) for key in urls]
v.What.append(vp.Group(params=asassn_params,
name=self.text_params_groupname))
v.What.append(vp.Group(params=asassn_urls,
name=self.url_params_groupname))
return v
# Note ac=True (autoconvert) is the default setting if dataType=None (the default)
amb_temp = vp.Param(name="amb_temp",
value=15.5,
unit='degrees',
ucd='phys.temperature')
amb_temp.Description = "Ambient temperature at telescope"
v.What.append(amb_temp)
# Now we set the sky location of our event:
vp.add_where_when(
v,
coords=vp.Position2D(ra=123.5,
dec=45,
err=0.1,
units='deg',
system=vp.definitions.sky_coord_system.utc_fk5_geo),
obs_time=datetime.datetime(2013, 1, 31, 12, 5, 30, tzinfo=pytz.utc),
observatory_location=vp.definitions.observatory_location.geosurface)
# Prettyprint some sections for desk-checking:
print("\n***Here is your WhereWhen:***\n")
print(vp.prettystr(v.WhereWhen))
print("\n***And your What:***\n")
print(vp.prettystr(v.What))
# You would normally describe or reference your telescope / instrument here:
vp.add_how(v,
descriptions='Discovered via 4PiSky',
def create_voevent(jsonfile=None, deployment=False, **kwargs):
""" template syntax for voeventparse creation of voevent
"""
required = [
'internalname', 'mjds', 'dm', 'width', 'snr', 'ra', 'dec', 'radecerr'
]
preferred = ['fluence', 'p_flux', 'importance', 'dmerr']
# set values
dd = kwargs.copy()
if jsonfile is not None: # as made by caltechdata.set_metadata
for k, v in trigger.items():
if k in required + preferred:
dd[k] = v
assert all([
k in dd for k in required
]), f'Input keys {list(dd.keys())} not complete (requires {required})'
# TODO: set this correctly
dt = time.Time(dd['mjds'], format='mjd').to_datetime(timezone=pytz.utc)
# create voevent instance
role = vp.definitions.roles.observation if deployment else vp.definitions.roles.test
v = vp.Voevent(
stream='', # TODO: check
stream_id=1,
role=role)
vp.set_who(v,
date=datetime.datetime.utcnow(),
author_ivorn="voevent.dsa-110.caltech.org") # TODO: check
vp.set_author(v,
title="DSA-110 Testing Node",
contactName="Casey Law",
contactEmail="*****@*****.**")
params = []
dm = vp.Param(name="dm",
value=str(dd['dm']),
unit="pc/cm^3",
ucd="phys.dispMeasure;em.radio.750-1500MHz",
dataType='float',
ac=True)
dm.Description = 'Dispersion Measure'
params.append(dm)
width = vp.Param(name="width",
value=str(dd['width']),
unit="ms",
ucd="time.duration;src.var.pulse",
dataType='float',
ac=True)
width.Description = 'Temporal width of burst'
params.append(width)
snr = vp.Param(name="snr",
value=str(dd['snr']),
ucd="stat.snr",
dataType='float',
ac=True)
snr.Description = 'Signal to noise ratio'
params.append(snr)
if 'fluence' in dd:
fluence = vp.Param(
name='fluence',
value=str(dd['fluence']),
unit='Jansky ms',
ucd='em.radio.750-1500MHz', # TODO: check
dataType='float',
ac=False)
fluence.Description = 'Fluence'
params.append(fluence)
if 'p_flux' in dd:
p_flux = vp.Param(name='peak_flux',
value=str(dd['p_flux']),
unit='Janskys',
ucd='em.radio.750-1500MHz',
dataType='float',
ac=True)
p_flux.Description = 'Peak Flux'
params.append(p_flux)
if 'dmerr' in dd:
dmerr = vp.Param(name="dm_error",
value=str(dd['dmerr']),
unit="pc/cm^3",
ucd="phys.dispMeasure;em.radio.750-1500MHz",
dataType='float',
ac=True)
dmerr.Description = 'Dispersion Measure error'
params.append(dmerr)
v.What.append(vp.Group(params=params, name='event parameters'))
vp.add_where_when(v,
coords=vp.Position2D(
ra=str(dd['ra']),
dec=str(dd['dec']),
err=str(dd['radecerr']),
units='deg',
system=vp.definitions.sky_coord_system.utc_fk5_geo),
obs_time=dt,
observatory_location='OVRO')
print("\n***Here is your WhereWhen:***\n")
print(vp.prettystr(v.WhereWhen))
print("\n***And your What:***\n")
print(vp.prettystr(v.What))
vp.add_how(v,
descriptions='Discovered with DSA-110',
references=vp.Reference('http://deepsynoptic.org'))
if 'importance' in dd:
vp.add_why(v, importance=str(dd['importance']))
else:
vp.add_why(v)
v.Why.Name = str(dd['internalname'])
vp.assert_valid_as_v2_0(v)
return v
def NewVOEvent(dm, dm_err, width, snr, flux, ra, dec, semiMaj, semiMin, ymw16, name, importance, utc, gl, gb):
z = dm/1200.0 #May change
errDeg = semiMaj/60.0
# Parse UTC
utc_YY = int(utc[:4])
utc_MM = int(utc[5:7])
utc_DD = int(utc[8:10])
utc_hh = int(utc[11:13])
utc_mm = int(utc[14:16])
utc_ss = float(utc[17:])
t = Time('T'.join([utc[:10], utc[11:]]), scale='utc', format='isot')
mjd = t.mjd
now = Time.now()
mjd_now = now.mjd
ivorn = ''.join([name, str(utc_hh), str(utc_mm), '/', str(mjd_now)])
v = vp.Voevent(stream='nl.astron.apertif/alert', stream_id=ivorn, role=vp.definitions.roles.test)
# v = vp.Voevent(stream='nl.astron.apertif/alert', stream_id=ivorn, role=vp.definitions.roles.observation)
# Author origin information
vp.set_who(v, date=datetime.datetime.utcnow(), author_ivorn="nl.astron")
# Author contact information
vp.set_author(v, title="ASTRON ALERT FRB Detector", contactName="Leon Oostrum", contactEmail="*****@*****.**", shortName="ALERT")
# Parameter definitions
#Apertif-specific observing configuration %%TODO: update parameters as necessary for new obs config
beam_sMa = vp.Param(name="beam_semi-major_axis", unit="MM", ucd="instr.beam;pos.errorEllipse;phys.angSize.smajAxis", ac=True, value=semiMaj)
beam_sma = vp.Param(name="beam_semi-minor_axis", unit="MM", ucd="instr.beam;pos.errorEllipse;phys.angSize.sminAxis", ac=True, value=semiMin)
beam_rot = vp.Param(name="beam_rotation_angle", value=0.0, unit="Degrees", ucd="instr.beam;pos.errorEllipse;instr.offset", ac=True)
tsamp = vp.Param(name="sampling_time", value=0.0496, unit="ms", ucd="time.resolution", ac=True)
bw = vp.Param(name="bandwidth", value=300.0, unit="MHz", ucd="instr.bandwidth", ac=True)
nchan = vp.Param(name="nchan", value="1536", dataType="int", ucd="meta.number;em.freq;em.bin", unit="None")
cf = vp.Param(name="centre_frequency", value=1400.0, unit="MHz", ucd="em.freq;instr", ac=True)
npol = vp.Param(name="npol", value="2", dataType="int", unit="None")
bits = vp.Param(name="bits_per_sample", value="8", dataType="int", unit="None")
gain = vp.Param(name="gain", value=1.0, unit="K/Jy", ac=True)
tsys = vp.Param(name="tsys", value=75.0, unit="K", ucd="phot.antennaTemp", ac=True)
backend = vp.Param(name="backend", value="ARTS")
# beam = vp.Param(name="beam", value= )
v.What.append(vp.Group(params=[beam_sMa, beam_sma, beam_rot, tsamp, bw, nchan, cf, npol, bits, gain, tsys, backend], name="observatory parameters"))
#Event parameters
DM = vp.Param(name="dm", ucd="phys.dispMeasure", unit="pc/cm^3", ac=True, value=dm )
# DM_err = vp.Param(name="dm_err", ucd="stat.error;phys.dispMeasure", unit="pc/cm^3", ac=True, value=dm_err)
Width = vp.Param(name="width", ucd="time.duration;src.var.pulse", unit="ms", ac=True, value=width)
SNR = vp.Param(name="snr", ucd="stat.snr", unit="None", ac=True, value=snr)
Flux = vp.Param(name="flux", ucd="phot.flux", unit="Jy", ac=True, value=flux)
Flux.Description = "Calculated from radiometer equation. Not calibrated."
Gl = vp.Param(name="gl", ucd="pos.galactic.lon", unit="Degrees", ac=True, value=gl)
Gb = vp.Param(name="gb", ucd="pos.galactic.lat", unit="Degrees", ac=True, value=gb)
v.What.append(vp.Group(params=[DM, Width, SNR, Flux, Gl, Gb], name="event parameters"))
# v.What.append(vp.Group(params=[DM, DM_err, Width, SNR, Flux, Gl, Gb], name="event parameters"))
#Advanced parameters (note, change script if using a differeing MW model)
mw_dm = vp.Param(name="MW_dm_limit", unit="pc/cm^3", ac=True, value=ymw16)
mw_model = vp.Param(name="galactic_electron_model", value="YMW16")
redshift_inferred = vp.Param(name="redshift_inferred", ucd="src.redshift", unit="None", value=z)
redshift_inferred.Description = "Redshift estimated using z = DM/1200.0 (Ioka 2003)"
v.What.append(vp.Group(params=[mw_dm, mw_model, redshift_inferred], name="advanced parameters"))
#WhereWhen
vp.add_where_when(v, coords=vp.Position2D(ra=ra, dec=dec, err=errDeg, units='deg', system=vp.definitions.sky_coord_system.utc_fk5_geo),
obs_time=datetime.datetime(utc_YY,utc_MM,utc_DD,utc_hh,utc_mm,int(utc_ss), tzinfo=pytz.UTC), observatory_location="WSRT")
#Why
vp.add_why(v, importance=imp)
v.Why.Name = name
if vp.valid_as_v2_0(v):
with open('%s.xml' % utc, 'wb') as f:
voxml = vp.dumps(v)
xmlstr = minidom.parseString(voxml).toprettyxml(indent=" ")
f.write(xmlstr)
print(vp.prettystr(v.Who))
print(vp.prettystr(v.What))
print(vp.prettystr(v.WhereWhen))
print(vp.prettystr(v.Why))
else:
print "Unable to write file %s.xml" % name
def generate_voevent(self, feed_id):
event_data = self.event_id_data_map[feed_id]
stream_id = self.feed_id_to_stream_id(feed_id)
v = create_skeleton_4pisky_voevent(substream=self.substream,
stream_id=stream_id,
role=vp.definitions.roles.observation,
date=datetime.datetime.utcnow()
)
gsaw_event_url = 'http://gsaweb.ast.cam.ac.uk/alerts/alert/'+feed_id
vp.add_how(v, references=[vp.Reference(uri=self.url),
vp.Reference(uri=gsaw_event_url)
]
)
v.How.Description = "Parsed from GAIA Science Alerts listings by 4PiSky-Bot."
posn_sc = SkyCoord(event_data[GaiaKeys.ra],
event_data[GaiaKeys.dec],
unit=(u.deg, u.deg))
# Astrometric accuracy is a guesstimate,
# http://gsaweb.ast.cam.ac.uk/alerts/tableinfo states that:
# "The sky position may either refer to a source in Gaia's own
# catalogue, or to a source in an external catalogue (e.g. SDSS) used as
# a reference for combining Gaia observations. Where the position comes
# from Gaia's catalogue, it is derived from a single, Gaia observation
# at the triggering point of the alert; this is not an astrometric
# measurement to the full precision of the Gaia main mission."
#
# We assume a 'worst-case' scenario of 100mas from SDSS at mag r=22, cf
# http://classic.sdss.org/dr7/products/general/astrometry.html
err_radius_estimate = 0.1 * u.arcsec
posn_simple = vp.Position2D(ra=posn_sc.ra.deg,
dec=posn_sc.dec.deg,
err=err_radius_estimate.to(u.deg).value,
units=vp.definitions.units.degrees,
system=vp.definitions.sky_coord_system.utc_icrs_geo,
)
# NB GAIA values are in Barycentric co-ordinate time
# (http://en.wikipedia.org/wiki/Barycentric_Coordinate_Time)
observation_time_tcb = astropy.time.Time(
event_data[GaiaKeys.obs_timestamp],
scale='tcb')
# We convert to UTC, in keeping with other feeds:
observation_time_utc_dt = observation_time_tcb.utc.datetime
observation_time_utc_dt = observation_time_utc_dt.replace(tzinfo=pytz.UTC)
vp.add_where_when(
v,
coords=posn_simple,
obs_time=observation_time_utc_dt,
observatory_location=vp.definitions.observatory_location.geosurface)
gaia_params = [vp.Param('Name', event_data[GaiaKeys.name])]
gaia_params.extend([vp.Param(key.strip(), event_data[key]) for key in
(GaiaKeys.alert_class,
GaiaKeys.obs_timestamp,
GaiaKeys.pub_timestamp,
GaiaKeys.ra,
GaiaKeys.dec,
GaiaKeys.comment,
)
])
gaia_params.extend([vp.Param(key.strip(), event_data[key],
unit='mag', ucd='phot.mag') for key in (
GaiaKeys.mag_alert,
GaiaKeys.mag_historic,
GaiaKeys.mag_historic_std_dev,
)
])
v.What.append(vp.Group(params=gaia_params,
name=self.text_params_groupname))
return v
def _NewVOEvent(self, dm, dm_err, width, snr, flux, ra, dec, semiMaj, semiMin,
ymw16, name, importance, utc, gl, gb, gain,
dt=TSAMP.to(u.ms).value, delta_nu_MHz=(BANDWIDTH / NCHAN).to(u.MHz).value,
nu_GHz=1.37, posang=0, test=None):
"""
Create a VOEvent
:param float dm: Dispersion measure (pc cm**-3)
:param float dm_err: Error on DM (pc cm**-3)
:param float width: Pulse width (ms)
:param float snr: Signal-to-noise ratio
:param float flux: flux density (mJy)
:param float ra: Right ascension (deg)
:param float dec: Declination (deg)
:param float semiMaj: Localisation region semi-major axis (arcmin)
:param float semiMin: Localisation region semi-minor axis (arcmin)
:param float ymw16: YMW16 DM (pc cm**-3)
:param str name: Source name
:param float importance: Trigger importance (0-1)
:param str utc: UTC arrival time in ISOT format
:param float gl: Galactic longitude (deg)
:param float gb: Galactic latitude (deg)
:param float gain: Telescope gain (K Jy**-1)
:param float dt: Telescope time resolution (ms)
:param float delta_nu_MHz: Telescope frequency channel width (MHz)
:param float nu_GHz: Telescope centre frequency (GHz)
:param float posang: Localisation region position angle (deg)
:param bool test: Whether to send a test event or observation event
"""
z = dm / 1000.0 # May change
errDeg = semiMaj / 60.0
# Parse UTC
utc_YY = int(utc[:4])
utc_MM = int(utc[5:7])
utc_DD = int(utc[8:10])
utc_hh = int(utc[11:13])
utc_mm = int(utc[14:16])
utc_ss = float(utc[17:])
t = Time(utc, scale='utc', format='isot')
# IERS server is down, avoid using it
t.delta_ut1_utc = 0
mjd = t.mjd
ivorn = ''.join([name, str(utc_hh), str(utc_mm), '/', str(mjd)])
# use default value for test flag if not set
if test is None:
test = self.test
# Set role to either test or real observation
if test:
self.logger.info("Event type is test")
v = vp.Voevent(stream='nl.astron.apertif/alert', stream_id=ivorn,
role=vp.definitions.roles.test)
else:
self.logger.info("Event type is observation")
v = vp.Voevent(stream='nl.astron.apertif/alert', stream_id=ivorn,
role=vp.definitions.roles.observation)
# Author origin information
vp.set_who(v, date=datetime.datetime.utcnow(), author_ivorn="nl.astron")
# Author contact information
vp.set_author(v, title="ARTS FRB alert system", contactName="Leon Oostrum",
contactEmail="*****@*****.**", shortName="ALERT")
# Parameter definitions
# Apertif-specific observing configuration
beam_sMa = vp.Param(name="beam_semi-major_axis", unit="MM",
ucd="instr.beam;pos.errorEllipse;phys.angSize.smajAxis", ac=True, value=semiMaj)
beam_sma = vp.Param(name="beam_semi-minor_axis", unit="MM",
ucd="instr.beam;pos.errorEllipse;phys.angSize.sminAxis", ac=True, value=semiMin)
beam_rot = vp.Param(name="beam_rotation_angle", value=str(posang), unit="Degrees",
ucd="instr.beam;pos.errorEllipse;instr.offset", ac=True)
tsamp = vp.Param(name="sampling_time", value=str(dt), unit="ms", ucd="time.resolution", ac=True)
bw = vp.Param(name="bandwidth", value=str(delta_nu_MHz), unit="MHz", ucd="instr.bandwidth", ac=True)
nchan = vp.Param(name="nchan", value=str(NCHAN), dataType="int",
ucd="meta.number;em.freq;em.bin", unit="None")
cf = vp.Param(name="centre_frequency", value=str(1000 * nu_GHz), unit="MHz", ucd="em.freq;instr", ac=True)
npol = vp.Param(name="npol", value="2", dataType="int", unit="None")
bits = vp.Param(name="bits_per_sample", value="8", dataType="int", unit="None")
gain = vp.Param(name="gain", value=str(gain), unit="K/Jy", ac=True)
tsys = vp.Param(name="tsys", value=str(TSYS.to(u.Kelvin).value), unit="K", ucd="phot.antennaTemp", ac=True)
backend = vp.Param(name="backend", value="ARTS")
# beam = vp.Param(name="beam", value= )
v.What.append(vp.Group(params=[beam_sMa, beam_sma, beam_rot, tsamp,
bw, nchan, cf, npol, bits, gain, tsys, backend],
name="observatory parameters"))
# Event parameters
DM = vp.Param(name="dm", ucd="phys.dispMeasure", unit="pc/cm^3", ac=True, value=str(dm))
DM_err = vp.Param(name="dm_err", ucd="stat.error;phys.dispMeasure", unit="pc/cm^3", ac=True, value=str(dm_err))
Width = vp.Param(name="width", ucd="time.duration;src.var.pulse", unit="ms", ac=True, value=str(width))
SNR = vp.Param(name="snr", ucd="stat.snr", unit="None", ac=True, value=str(snr))
Flux = vp.Param(name="flux", ucd="phot.flux", unit="Jy", ac=True, value=str(flux))
Flux.Description = "Calculated from radiometer equation. Not calibrated."
Gl = vp.Param(name="gl", ucd="pos.galactic.lon", unit="Degrees", ac=True, value=str(gl))
Gb = vp.Param(name="gb", ucd="pos.galactic.lat", unit="Degrees", ac=True, value=str(gb))
# v.What.append(vp.Group(params=[DM, Width, SNR, Flux, Gl, Gb], name="event parameters"))
v.What.append(vp.Group(params=[DM, DM_err, Width, SNR, Flux, Gl, Gb], name="event parameters"))
# Advanced parameters (note, change script if using a differeing MW model)
mw_dm = vp.Param(name="MW_dm_limit", unit="pc/cm^3", ac=True, value=str(ymw16))
mw_model = vp.Param(name="galactic_electron_model", value="YMW16")
redshift_inferred = vp.Param(name="redshift_inferred", ucd="src.redshift", unit="None", value=str(z))
redshift_inferred.Description = "Redshift estimated using z = DM/1000.0"
v.What.append(vp.Group(params=[mw_dm, mw_model, redshift_inferred], name="advanced parameters"))
# WhereWhen
vp.add_where_when(v, coords=vp.Position2D(ra=ra, dec=dec, err=errDeg, units='deg',
system=vp.definitions.sky_coord_system.utc_fk5_geo),
obs_time=datetime.datetime(utc_YY, utc_MM, utc_DD, utc_hh, utc_mm, int(utc_ss),
tzinfo=pytz.UTC),
observatory_location="WSRT")
# Why
vp.add_why(v, importance=importance)
v.Why.Name = name
if vp.valid_as_v2_0(v):
with open('{}.xml'.format(utc), 'wb') as f:
voxml = vp.dumps(v)
xmlstr = minidom.parseString(voxml).toprettyxml(indent=" ")
f.write(xmlstr.encode())
self.logger.info(vp.prettystr(v.Who))
self.logger.info(vp.prettystr(v.What))
self.logger.info(vp.prettystr(v.WhereWhen))
self.logger.info(vp.prettystr(v.Why))
else:
self.logger.error("Unable to write file {}.xml".format(name))