{
"subject": "LIGO/Virgo/KAGRA S230522a: 2 counterpart neutrino candidates from IceCube neutrino searches",
"bibcode": "2023GCN.33850....1I",
"createdOn": 1684758395902,
"circularId": 33850,
"submitter": "Jessie Thwaites at IceCube/U Wisc-Madison ",
"body": "IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nA search for track-like muon neutrino events detected by IceCube consistent with the sky localization of gravitational-wave candidate S230522a in a time range of 1000 seconds centered on the alert event time (2023-05-22 09:29:45.000 UTC to 2023-05-22 09:46:25.000 UTC) have been performed [1,2]. During this time period IceCube was collecting good quality data. The search is a maximum likelihood analysis which searches for a generic point-like neutrino source coincident with the given GW skymap. \n\n2 track-like event(s) are found in spatial and temporal coincidence with the gravitational-wave candidate S230522a calculated from the map circulated in the 2-Preliminary notice. This represents an overall p-value of 0.04 (1.8 sigma). These p-values measure the consistency of the observed track-like events with the known atmospheric backgrounds for this single map (not trials corrected for multiple GW events). The most probable multi-messenger source direction based on the neutrinos and GW skymap is RA 78.93, dec -37.54 degrees. The false alarm rate of these coincidences can be obtained by multiplying the p-values with their corresponding GW trigger rates. \n\nProperties of the coincident events are shown below.\n\n dt ra dec Angular Uncertainty(deg) p-value(generic transient) p-value(Bayesian)\n-----------------------------------------------------------------------------------------------------\n-152.13 78.98 -37.59 0.43 0.04 n/a\n73.08 127.79 -8.33 0.43 0.09 n/a\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 representing 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 geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu.\n\n[1] M. G. Aartsen et al 2020 ApJL 898 L10\n[2] Abbasi et al. Astrophys.J. 944 (2023) 1, 80"
}