TITLE:   GCN CIRCULAR
NUMBER:  35053
SUBJECT: GRB 231115A: Upper limits from a neutrino search with IceCube
DATE:    23/11/16 02:50:50 GMT
FROM:    Sam Hori at IceCube/U Wisc-Madison <sahori@wisc.edu>

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



IceCube has performed a search for track-like muon neutrino events arriving from the direction of GRB 231115A (GCN Circ. 35035<https://gcn.nasa.gov/circulars/35035> (Fermi-GBM), INTEGRAL GCN Notice 10427<https://gcn.gsfc.nasa.gov/other/10427.integral>), a likely magnetar giant flare in M82 (D'Avanzo et al., GCN Circ. 35036<https://gcn.nasa.gov/circulars/35036>; Mereghetti et al., GCN Circ 35037<https://gcn.nasa.gov/circulars/35037>; Burns, GCN Circ 35038<https://gcn.nasa.gov/circulars/35038>).


We searched a time window off +/- 2000 seconds from the initial trigger reported by INTEGRAL (23/11/15 15:36:22.88 UT), during which IceCube was collecting good quality data. We used the offline direction reported by INTEGRAL (INTEGRAL GCN Notice 10427<https://gcn.gsfc.nasa.gov/other/10427.integral>).  Zero track-like events are found in coincidence with the position of the GRB. We accordingly derive a time-integrated muon-neutrino flux upper limit for this source of E^2 dN/ dE = 7.6*10^-2 GeV cm^-2 at 90% CL, under the assumption of an E^-2 power-law spectrum. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum have energies in the approximate energy range between 500 GeV and 130 TeV.


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<mailto:roc@icecube.wisc.edu>.


[1] IceCube Collaboration, R. Abbasi  et al., ApJ 910 4 (2021)