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GCN Circular 21511

Subject
LIGO/Virgo G298048: COINCIDENT IceCube neutrino candidate with Fermi GBM trigger 524666471/170817529
Date
2017-08-17T14:54:58Z (7 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

In GCN 21508 we recently reported that the identification of IceCube neutrino candidates that are temporally and directionally coincident with LIGO/Virgo G298048.

A comparison of these neutrino candidates with Fermi GBM trigger 524666471/170817529 shows that one IceCube neutrino candidate is also *directionally* coincident with 90% CL of the Fermi GRB event. The coordinates of this reconstructed neutrino source are below:

#            dt[s]     RA[deg]    Dec[deg]      E[TeV]  Sigma[deg]
------------------------------------------------------------------
4.         -153.47       182.0        -3.2        0.88         0.9

(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])

A coincident neutrino-GW skymap has been posted to GraceDB (<https://gracedb.ligo.org/apiweb/events/G298048/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/G298048/files/IceCubeNeutrinoList.json,0>
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