[vsnet-grb 447317] The new notice AMON_NU_EM_COINC from GCN
Bacodine
vxw at capella2.gsfc.nasa.gov
Fri May 29 07:56:57 JST 2020
TO: All GCN Notice recipients
RE: AMON NU_EM_COINC Notice type is available
DT: 28 May 2020
INTRODUCTION:
The GCN system has been modified to incorporate the distribution
of the AMON_NU_EM_COINC (Extreme High Energy) Notice type.
The NU_EM_COINC notice is due to a coincidence of high-energy neutrino data and
high-energy electromagnetic data.
Like all the other sources of transient information within the GCN system,
users can elect to receive this AMON_NU_EM_COINC Notice type.
OCCURRENCE RATE:
There will be about 4-8 AMON_NU_EM_COINC Notices per year.
TIME DELAY:
The time delays for this notice type will range from 3 to 7 hours from the event.
The delay depends on the latency of the data from the EM observatories (HAWC and Fermi).
LOCATION ERROR:
The location uncertainties are in the 0.2-0.1 deg range (radius, stat only,
50% containment and 90% containment).
It is a combination of the neutrino uncertainaty and the EM uncertainty.
The uncertainty and position are found after maximizing the best likelihood
of the coincidence given the data.
NOTICE TYPE, CONTENT, and PURPOSE:
This notice type contains a discovery of a temporal and spatial coincidence
of high-energy ( ~ TeV) neutrinos from the IceCube or the ANTARES detector
and high energy gamma-ray data from HAWC (100 GeV - 100 TeV) or
from Fermi (100MeV - 100 GeV). These can be caused by Supernova, GRBs,
GW Binary mergers, other astrophysical transients, and sometimes background.
The Notices contain the date, time, trigger number, and the FAR.
It contains the RA, Dec location of the best-combined direction from the neutrino
and gamma-ray events.
ACTION ITEM:
If, after reviewing the information below, you want to receive
these AMON_NU_EM_COINC notices, please send me a request to have them enabled.
You can do this by forwarding this email (which has your sitename identifier)
to sbarthel at milkyway.gsfc.nasa.gov .
OR
You can go to http://gcn.gsfc.nasa.gov/gcn/config_builder.html
and select "#2 Modify an existing config" (and type in your sitename).
You can also take this opportunity to make other changes to your configuration.
ARCHIVE STORAGE:
The GCN/AMON_NU_EM_COINC Notices are archived within the GCN website
in the Table of AMON_NU_EM_COINC Notices:
http://gcn.gsfc.nasa.gov/gcn/amon_nu_em_coinc_events.html
MORE INFORMATION:
Can be found at: http://gcn.gsfc.nasa.gov/gcn/amon.html
NOTICE EXAMPLES:
Here is an example of a full-format email AMON_NU_EM_COINC Notice,
in the VOEvent format, and a pointer to the 160Byte-binary packet format:
(Note all values are made up for this listing of the contents.)
========================================================================
TITLE: GCN/AMON NOTICE
NOTICE_DATE: Thu 22 May 20 20:24:59 UT
NOTICE_TYPE: AMON Neutrino-EM Coincidence
AMON_STREAM: 1
EVENT_DATE: 200522A
EVENT_NUM: 48580
REVISION: 0
RUN_NUM: 0
SRC_RA: 23.0100d {+01h 32m 02s} (J2000),
23.2633d {+01h 33m 03s} (current),
22.3889d {+01h 29m 33s} (1950)
SRC_DEC: -10.1300d {-10d 07' 47"} (J2000),
-10.0256d {-10d 01' 31"} (current),
-10.3868d {-10d 23' 12"} (1950)
SRC_ERROR: 35.93 [arcmin radius, stat-only, 90% containment]
SRC_ERROR50: 19.80 [arcmin radius, stat-only, 50% containment]
DISCOVERY_DATE: 18991 TJD; 143 DOY; 20/05/22 (yy/mm/dd)
DISCOVERY_TIME: 66098 SOD {18:21:38.00} UT
COINC_PAIR: 1 IC-HAWC [index and actual string]
DELTA_T: 17056.25 [sec]
FAR: 3.2255e+04 [yr^-1]
TRIG_ID18: 0x40
MISC19: 0xAC000000
SUN_POSTN: 66.19d {+04h 24m 45s} +21.63d {+21d 37' 55"}
SUN_DIST: 52.69 [deg] Sun_angle= 2.9 [hr] (West of Sun)
MOON_POSTN: 145.05d {+09h 40m 12s} +18.40d {+18d 23' 48"}
MOON_DIST: 123.17 [deg]
GAL_COORDS: 154.23,-70.49 [deg] galactic lon,lat of the event
ECL_COORDS: 17.35,-18.33 [deg] ecliptic lon,lat of the event
COMMENTS: AMON NEUTRINO-EM Coincidence.
========================================================================
<?xml version = '1.0' encoding = 'UTF-8'?>
<voe:VOEvent
ivorn="ivo://nasa.gsfc.gcn/AMON#NU_EM_Event2020-05-22T18:21:38.00_000000_000048580-004"
role="observation" version="2.0"
xmlns:voe="http://www.ivoa.net/xml/VOEvent/v2.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.ivoa.net/xml/VOEvent/v2.0 http://www.ivoa.net/xml/VOEvent/VOEvent-v2.0.xsd" >
<Who>
<AuthorIVORN>ivo://nasa.gsfc.tan/gcn</AuthorIVORN>
<Author>
<shortName>AMON (via VO-TAN)</shortName>
<contactName>Erik Blaufuss, James DeLaunay, Hugo Ayala</contactName>
<contactEmail>blaufuss at umd.edu, jjd330 at psu.edu, hgayala at psu.edu</contactEmail>
</Author>
<Date>2020-05-22T20:24:59</Date>
<Description>This VOEvent message was created with TAN VOE version: 1.48 21may20</Description>
</Who>
<What>
<Param name="Packet_Type" value="172" >
<Description>GCN's Notice_Type ID number for the AMON_NE_EM_COINC Notice type.</Description> </Param>
<Param name="Pkt_Ser_Num" value="1" >
<Description>GCN's counting of how many are produced with GCN for each run session.</Description> </Param>
<Param name="Stream" value="1" unit="dn" ucd="meta.id" >
<Description>The AMON Alert Stream ID number.</Description> </Param>
<Param name="Event_ID" value="48580" unit="dn" ucd="meta.number" >
<Description>The AMON Event ID number.</Description> </Param>
<Param name="Event_Date" value="200522A" unit="dn" ucd="meta.number" >
<Description>The AMON Event Date.</Description> </Param>
<Param name="Run_ID" value="0" unit="dn" ucd="meta.number" >
<Description>The AMON Run ID number.</Description> </Param>
<Param name="Rev" value="0" ucd="meta.number" unit=" " >
<Description>Revision of the alert.</Description> </Param>
<Param name="Pair_Name_ID" value="1" ucd="meta.number" unit=" " >
<Description>Index number (into an aray) of the 2 instruments in the Coincidence.</Description> </Param>
<Param name="FAR" value="3.2255e+04" ucd="stat.probability" unit="yr^-1" >
<Description>False Alarm Rate, Number per year.</Description> </Param>
<Param name="deltaT" value="17056.25" ucd="time.timeduration" unit="s" >
<Description>Time window of the search</Description> </Param>
<Param name="src_err_90" value="35.93" unit="arcmin" >
<Description>Location error, statistical only. 90% containment.</Description> </Param>
<Param name="src_err_50" value="19.80" unit="arcmin" >
<Description>Location error, statistical only. 50% containment.</Description> </Param>
<Param name="private" value="0" ucd="meta.number" unit="" >
<Description>Is this notice available only to the AMON team members, not public.</Description> </Param>
<Param name="retraction" value="0" ucd="meta.number" unit="" >
<Description>If equal 1, then this event is no longer considered astrophysical.</Description> </Param>
<Param name="Trigger_ID" value="0x40" />
<Param name="Misc_flags" value="0xac000000" />
<Group name="Trigger_ID" >
<Param name="PrivateFlag" value="false" />
<Param name="Role" value="false" />
<Param name="RetractFlag" value="false" />
<Param name="InternalTest" value="false" />
</Group>
</What>
<WhereWhen>
<ObsDataLocation>
<ObservatoryLocation id="GEOLUN" />
<ObservationLocation>
<AstroCoordSystem id="UTC-FK5-GEO" />
<AstroCoords coord_system_id="UTC-FK5-GEO">
<Time unit="s">
<TimeInstant>
<ISOTime>2020-05-22T18:21:38.00</ISOTime>
</TimeInstant>
</Time>
<Position2D unit="deg">
<Name1>RA</Name1>
<Name2>Dec</Name2>
<Value2>
<C1>23.0100</C1>
<C2>-10.1300</C2>
</Value2>
<Error2Radius>0.3300</Error2Radius>
</Position2D>
</AstroCoords>
</ObservationLocation>
</ObsDataLocation>
<Description>The RA,Dec coordinates are of the type: source_object.</Description>
</WhereWhen>
<How>
<Description>GCN</Description>
<Reference uri="http://gcn.gsfc.nasa.gov/gcn/amon.html" type="url" />
<Reference uri="http://gcn.gsfc.nasa.gov/gcn/amon_events.html" type="url" />
</How>
<Why importance="1.0">
<Inference probability="1.0">
<Concept>process.variation.burst;em</Concept>
</Inference>
</Why>
<Description>
</Description>
</voe:VOEvent>
========================================================================
The socket packet (Type=172) contents can be found at:
http://gcn.gsfc.nasa.gov/gcn/sock_pkt_def_doc.html
========================================================================
REMINDER OF RECENT ADDITIONS TO GCN:
In case you have missed them, here is a brief list of the most recent additions
to the GCN system. You might consider signing up for these Notice types as well.
The full announcements/descriptions for each of these can be found at:
http://gcn.gsfc.nasa.gov/gcn/whats_new.html
LVC Notices are now public (Mar 2017) // The 4 LVC Notices going public
FERMI_GBM_SUBTHRESHOLD (July 2017) // Fermi-GBM triggers below the normal acceptance level
SWIFT_ACTUAL_POINTDIR (Nov 2016) // The actual pointing direction ~1 min after every slew
CALET_LC (Mar 2016) // The Flight- & Ground-produced CALET-GBM lightcurves
SNEWS (Dec 2015) // SNEWS neutrino coincidences and singles from supernovae
Sincerely,
Scott
Scott Barthelmy NASA-GSFC, Code 661, Greenbelt, MD 20771
PHONE: 301-286-3106 (office) CELL: 301-346-3733
EMAIL: scott at milkyway.gsfc.nasa.gov
PAGER: 3013463733 at cingularme.com
WEB: http://gcn.gsfc.nasa.gov/gcn
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