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GCN Circular 23221

Subject
INTEGRAL observation of IceCube-180908A
Date
2018-09-11T06:17:41Z (5 years ago)
From
Volodymyr Savchenko at ISDC,U of Geneve <savchenk@in2p3.fr>
V. Savchenko, C. Ferrigno (ISDC, University of Geneva, CH)
P. Ubertini, A. Bazzano, L. Natalucci, J. Rodi (INAF IAPS-Roma, Italy)
S. Mereghetti (INAF IASF-Milano, Italy)
P. Laurent (CEA, Saclay, France)
E. Kuulkers (ESTEC/ESA, Noordwijk, The Netherlands)


Using INTEGRAL, we have performed a search for a prompt gamma-ray
counterpart of the cosmic neutrino candidate IceCube-180908A
(GCN 23214).

At the time of the event (2018-09-08 19:59:32 UTC, hereafter T0),
INTEGRAL was operating in nominal mode. The peak of the neutrino
localization probability was at an angle of 80 deg with respect to
the spacecraft pointing axis. This orientation implies a strongly
suppressed response of IBIS, and somewhat suppressed response of SPI-ACS.

The background within ��300 seconds around the event was very
stable.�� We do not detect any significant counterpart and estimate
a 3-sigma upper limit on the 75-2000 keV fluence of 2.8e-07 erg/cm^^2
for a burst lasting less than 1 s with a characteristic short GRB
spectrum (an exponentially cut off power law with alpha=-0.5 and
Ep=600 keV) occurring at any time in the interval within ��300 s
around T0.

For a typical long GRB spectrum (Band function with alpha=-1,
beta=-2.5, and Ep=300 keV), the derived peak flux upper limit is
~3.2e-07 (9.4e-07) erg/cm^^2 /s at 1 s (8 s) time scale in 75-2000
keV energy range.
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