TITLE:   GCN CIRCULAR
NUMBER:  21658
SUBJECT: LIGO/Virgo G298936: INTEGRAL was inactive at the time of the event
DATE:    17/08/23 15:32:13 GMT
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)

The INTEGRAL spacecraft has a highly elliptical orbit and the
instruments are switched off around the perigee passage, every 2.6
days, to prevent radiation-induced damages. Unfortunately, at the time
of the LIGO/Virgo trigger G298936 (2017-08-23 13:13:58 UTC) the
spacecraft was preparing to the start the observations after the
perigee passage between the orbits number 1853 and 1854 and no
scientific instrument data are available before
2017-08-23T13:34:33.565 (~20 minutes after the event).