GCN Circular 21507
Subject
LIGO/Virgo G298048: INTEGRAL detection of a prompt gamma-ray counterpart
Date
2017-08-17T13:57:47Z (7 years ago)
From
Volodymyr Savchenko at APC,Paris <savchenk@apc.in2p3.fr>
V. Savchenko (ISDC, University of Geneva, CH)
on behalf of the INTEGRAL group:
S. Mereghetti (IASF-Milano, Italy),
C. Ferrigno ((ISDC, University of Geneva, CH),
E. Kuulkers (ESTEC/ESA, The Netherlands),
A. Bazzano (IAPS-Roma, Italy), E. Bozzo,
T. J.-L. Courvoisier (ISDC, University of Geneva, CH)
S. Brandt (DTU - Denmark) R. Diehl (MPE-Garching, Germany)
L. Hanlon (UCD, Ireland) P. Laurent (APC, Saclay/CEA, France)
A. Lutovinov (IKI, Russia) J.P. Roques (CESR, France)
R. Sunyaev (IKI, Russia) P. Ubertini (IAPS-Roma, Italy)
We investigated serendipitous INTEGRAL observations carried out at the
time of the LIGO/Virgo burst candidate G298048. The satellite was
covering a fraction of the probability of the LIGO-Virgo
localization. The best sensitivity depends on the source location.
We investigated the SPI-ACS light curves between -30 and +30 s from
the trigger time (2017-08-17 12:41:04 UTC, T0) on temporal scales from
0.1 to 100s.
In the SPI-ACS data, we detect a short and relatively weak transient
with S/N of at T0, with an S/N larger than 3. coincident with the GBM
trigger (Connaughton 2017, GCN 21506). Further analysis is ongoing,
and will be reported in the coming circulars.