TITLE:   GCN CIRCULAR
NUMBER:  33814
SUBJECT: LIGO/Virgo S230518h: Upper limits from IceCube neutrino search
DATE:    23/05/18 14:37:41 GMT
FROM:    Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>

IceCube Collaboration (http://icecube.wisc.edu/) reports:

A search for track-like muon neutrino events detected by IceCube consistent with the sky localization of gravitational-wave candidate S230518h in a time range of 1000 seconds centered on the alert event time (2023-05-18 12:50:48.000 UTC to 2023-05-18 13:07:28.000 UTC) has been performed [1,2]. 

During this time period IceCube was collecting good quality data. No significant track-like events are found in spatial coincidence of S230518h calculated from the map circulated in the 1-Preliminary notice.

IceCube's sensitivity assuming an E^-2 spectrum (E^2 dN/dE) to neutrino point sources within the locations spanned by the 90% spatial containment of S230518h ranges from 0.028 to 1.133 GeV cm^-2 in a 1000 second time window.

The 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.

[1] M. G. Aartsen et al 2020 ApJL 898 L10
[2] Abbasi et al. Astrophys.J. 944 (2023) 1, 80