TITLE:   GCN CIRCULAR
NUMBER:  21440
SUBJECT: LIGO/Virgo G296853: no INTEGRAL data at the time of the event
DATE:    17/08/09 21:13:12 GMT
FROM:    Carlo Ferrigno at ISDC/INTEGRAL  <carlo.ferrigno@unige.ch>

C. Ferrigno (ISDC, University of Geneva, CH)
on behalf of the INTEGRAL group:
V. Savchenko (ISDC, University of Geneva, CH)
S. Mereghetti (IASF-Milano, Italy),
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)

The INTEGRAL satellite requires continuous contact between the 
spacecraft and a ground station
for operations and data down-link.
Unfortunately, at the time
of the LIGO/Virgo trigger G296853 (2017-08-09 08:28:21.747 UTC),
there was a scheduled ground-station outage. Therefore, no INTEGRAL data are
available on 2017-08-09 between 06:40:13 and 12:24:39 UTC, preventing 
any investigation of the presence of an electromagnetic signal 
temporally coincident with this gravitational wave trigger.


The field of view of the imaging instruments has not covered the 
high-probability region
of the LIGO event at any time after the trigger and it will not in the 
coming days.
As a consequence, no search of a possible GRB afterglow-like signal is 
foreseeable.