[vsnet-grb-info 23745] LIGO/Virgo S190924h: Not observable by CALET

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25844
SUBJECT: LIGO/Virgo S190924h: Not observable by CALET
DATE:    19/09/25 04:15:11 GMT
FROM:    Yuta Kawakubo at Louisiana State U./CALET  <kawakubo1 at lsu.edu>

T. Sakamoto, A. Yoshida, V. Pal'shin, S. Sugita (AGU), 
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),
Y. Asaoka, S. Torii (Waseda U), Y. Shimizu, 
T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), 
M. L. Cherry (LSU), S. Ricciarini (U of Florence),
P. S. Marrocchesi (U of Siena),
and the CALET collaboration:

At the trigger time of the compact binary merger candidate S190924h,
T0 = 2019-09-24 02:18:46.847 UT (The LIGO Scientific Collaboration 
and Virgo Collaboration, GCN Circ. 25829), the CALET Gamma-ray 
Burst Monitor (CGBM) high voltages were off (from T0-1 min to 
T0+16 min).

The CALET Calorimeter (CAL) was operating in the high energy
trigger mode at the trigger time of S190924h. Using the CAL data,
we have searched for gamma-ray events in the 10-100 GeV band from
-60 sec to +60 sec from the GW trigger time and found no candidates.
There is no significant overlap with the high probability 
localization region.  The CAL FOV was centered at RA=273.4 deg,
Dec=40.2 deg at T0.