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GCN Circular 27372

LIGO/Virgo S200311bg: Not observable by CALET
2020-03-12T12:18:33Z (4 years ago)
Yuta Kawakubo at Louisiana State U./CALET <>
S. Torii (Waseda U), A. Yoshida, T. Sakamoto, V. Pal'shin, 
S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U),
S. Nakahira (RIKEN), Y. Asaoka (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 S200311bg,
T0 = 2020-03-11 11:58:53.398 UT (The LIGO Scientific Collaboration 
and Virgo Collaboration, GCN Circ. 27358), the CALET Gamma-ray 
Burst Monitor (CGBM) high voltages were off (from T0-3 min to 
T0+15 min).

The CALET Calorimeter (CAL) was operating in the high energy trigger
mode at the trigger time of S200311bg. 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
was no significant overlap with the LVC high probability localization 
region at T0+-60 sec.  The CAL FOV was centered at RA = 191.3 deg, 
Dec = +51.5 deg at T0.
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