{
"subject": "LIGO/Virgo/KAGRA S230908b: one counterpart neutrino candidate from IceCube neutrino searches",
"submittedHow": "web",
"bibcode": "2023GCN.34646....1I",
"createdOn": 1694290690908,
"circularId": 34646,
"submitter": "acz2122@columbia.edu",
"body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nA search for track-like muon neutrino events detected by IceCube consistent with the sky\nlocalization of the low-significance gravitational wave candidate S230908b in a time range of 1000 seconds\ncentered on the alert event time (2023-09-08 03:41:42 UTC to 2023-09-08 03:58:22 UTC)\nhas been performed [1,2]. During this time period IceCube was collecting good quality data.\nOne hypothesis test was conducted for this low-significance gravitational wave event. The\nsearch uses a Bayesian approach to quantify the joint GW + neutrino event significance, which\nassumes a binary merger scenario and accounts for known astrophysical priors, such as GW source\ndistance, in the significance estimate [3].\n\nOne track-like event is found in spatial and temporal coincwidence with the gravitational-wave\ncandidate S230908b calculated from the map circulated by LVK as S230908b-2-Preliminary. This\nrepresents an overall pre-trial p-value of 0.0056 for the Bayesian search.\n\nThe reported p-value here does not account for any trials correction (multiple hypotheses testing). The false alarm rate of these coincidences can be obtained by multiplying the p-values with their corresponding GW trigger rates. Further details are available at https://gcn.nasa.gov/missions/icecube. \n\nProperties of the coincident event(s) are shown below.\n\ndt(s)\tRA(deg)\t\tDec(deg)\tAngular uncertainty(deg) p-value(generic transient) p-value(Bayesian)\n-----------------------------------------------------------------------------------------------------\n+144.76 186.17 \t+29.37 \t1.082 \t\tnot applicable \t0.0056\n\n\n\nwhere:\ndt = Time of track event minus time of GW trigger (sec)\nAngular uncertainty = Angular uncertainty of track event: the radius of a circle\n \trepresenting 90% CL containment by area.\np-value = the p-value for this specific track event from each search.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the\ngeographic South Pole, Antarctica. The IceCube realtime alert point of contact can be\nreached at roc@icecube.wisc.edu\n\n\n[1] M. G. Aartsen et al 2020 ApJL 898 L10\n[2] Abbasi et al. Astrophys.J. 944 (2023) 1, 80\n[3] I. Bartos et al. 2019 Phys. Rev. D 100, 083017"
}