TITLE:   GCN CIRCULAR
NUMBER:  25214
SUBJECT: LIGO/Virgo S190728q: No transient candidates in CALET observations 
DATE:    19/07/29 03:15:53 GMT
FROM:    Yuta Kawakubo at Louisiana State U./CALET  <kawakubo1@lsu.edu>

S. Nakahira (RIKEN), A. Yoshida, T. Sakamoto, V. Pal'shin,  
S. Sugita (AGU),  Y. Kawakubo (LSU), K. Yamaoka (Nagoya U),
Y. Asaoka, S. Ozawa, 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:

The CALET Gamma-ray Burst Monitor (CGBM) was operating at the trigger 
time of S190728q T0 = 2019-07-28 06:45:10.529 UT (The LIGO
Scientific Collaboration and Virgo Collaboration, GCN Circ. 25187).

No CGBM on-board trigger occurred around the event time.  Based
on the LIGO-Virgo localization sky map, the summed LIGO probabilities 
inside the CGBM HXM (7 - 3000 keV) and SGM (40 keV - 28 MeV) fields 
of view are 0 % and 0 %, respectively (and 0 % credible region of the 
initial localization map was above the horizon).  The HXM and SGM fields
of view were centered at RA = 175.7 deg, Dec = 36.7 deg and 
RA = 184.9 deg, Dec = 30.3 deg at T0, respectively.

The CALET Calorimeter (CAL) was operating in the low energy
trigger mode at the trigger time of S190728q, but the CAL FOV
does not have any overlap with LVC probability significance map.
The CAL FOV was centered at RA= 184.8 deg, DEC= 30.3 deg at T0.