[vsnet-grb-info 24138] LIGO/Virgo S191110af: Upper limits from CALET observations.

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26237
SUBJECT: LIGO/Virgo S191110af: Upper limits from CALET observations.
DATE:    19/11/12 06:43:47 GMT
FROM:    Yuta Kawakubo at Louisiana State U./CALET  <kawakubo1 at lsu.edu>

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 
S191110af, T0 = 2019-11-10 23:06:44.183 UT (The LIGO 
Scientific Collaboration and Virgo Collaboration, GCN 
Circ. 26222), the CALET Gamma-ray Burst Monitor (CGBM)
high voltages were off (from T0-1 min to T0+31 min).

The CALET Calorimeter (CAL) was operating in the high 
energy trigger mode at the trigger time of S191110af. 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 in the overwrap region with the
LIGO-Virgo high probability localization region.  The 90% upper
limit of CAL is 8.4x10^-6 erg/cm^2/s (10-100 GeV) when the
summed LIGO-Virgo probability reaches 40%. The CAL FOV
was centered at RA= 218.6 deg, DEC= -42.7 deg at T0.