Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 27232

Subject
LIGO/Virgo S200225q: Not observable by CALET
Date
2020-02-27T06:00:18Z (4 years ago)
From
Yuta Kawakubo at Louisiana State U./CALET <kawakubo1@lsu.edu>
K. Yamaoka (Nagoya U), A. Yoshida, T. Sakamoto, 
V. Pal'shin, S. Sugita (AGU),  Y. Kawakubo (LSU), 
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 S200225q,
T0 = 2020-02-25 06:04:21.397 UT (The LIGO Scientific Collaboration 
and Virgo Collaboration, GCN Circ. 27193), the CALET Gamma-ray 
Burst Monitor (CGBM) high voltages were off (from T0-23 min to 
T0+10 min).

The CALET Calorimeter (CAL) was operating in the high energy trigger
mode at the trigger time of S200225q. 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 = 157.8 deg, 
Dec= -32.7 deg at T0.
Looking for U.S. government information and services? Visit USA.gov