GCN Circular 21061
Subject
LIGO/Virgo G284239: IceCube neutrino observations
Date
2017-05-03T15:05:09Z (8 years ago)
From
Imre Bartos at Columbia/LIGO <imrebartos@gmail.com>
I. Bartos, S. Countryman (Columbia), C. Finley (U Stockholm), E.
Blaufuss (U Maryland), R. Corley, Z. Marka, S. Marka (Columbia) on
behalf of the IceCube Collaboration
We searched IceCube online track-like neutrino candidates (GFU) detected
in a [-500,500] second interval about the LIGO-Virgo trigger G284239.
We compared the candidate source directions of 1 temporally-coincident
neutrinos to the LIB_SKYMAP skymap, with the following parameters:
# dt[s] RA[deg] Dec[deg] E[TeV] Sigma[deg]
------------------------------------------------------------------
1. 4.38 136.0 -2.9 0.79 28.2
(dt--time from GW in [seconds]; RA/Dec--sky location in [degrees];
E--reconstructed secondary muon energy in [TeV]; Sigma--uncertainty of
direction reconstruction in [degrees])
The analysis found NO COINCIDENT ONLINE TRACK-LIKE NEUTRINO CANDIDATES
detected by IceCube within the 500 second window surrounding G284239
within the LIB_SKYMAP skymap.
A coincident neutrino-GW skymap has been posted to GraceDB
(<https://gracedb.ligo.org/apiweb/events/G284239/files/coinc_skymap_initial_icecube.png,0>).
A JSON-formatted list of the above neutrinos can be downloaded from
GraceDB at:
<https://gracedb.ligo.org/apiweb/events/G284239/files/IceCubeNeutrinoList.json,0>
In addition, we are performing coincident searches with other IceCube
data streams, including the high-energy starting events (HESE) and
Supernova triggers. HESE events have typical energies > 60 TeV and
start inside the detector volume, leading to a relatively pure event
sample with a high fraction of astrophysical neutrinos. The SN trigger
system is sensitive to sudden increases in photomultiplier counts across
the detector, which could indicate a burst of MeV neutrinos. We will
submit separate GCN circulars if coincident HESE or SN triggers are found.
The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector
operating at the geographic South Pole, Antarctica. For a description
of the IceCube realtime alert system, please refer to
<http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1610.01814>; for more
information on joint neutrino and gravitational wave searches, please
refer to <http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1602.05411>.