LIGO/Virgo S200115j: Upper limits from CALET observations.
Abstract
At the trigger time of the compact binary merger candidate S200115j T0 = 2020-01-15 04:23:09.742 UT (The LIGO Scientific Collaboration and Virgo Collaboration, GCN Circ. 26759), the CALET Gamma-ray Burst Monitor (CGBM) high voltages were off (from T0-5 min to T0+11 min). The CALET Calorimeter (CAL) was operating in the high energy trigger mode at the trigger time of S200115j. 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 1.7 x 10^-6 erg/cm^2/s (10-100 GeV) when the summed LIGO-Virgo probability reaches 20%. The CAL FOV was centered at RA = 84.4 deg, DEC = +45.9 deg at T0.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- January 2020
- Bibcode:
- 2020GCN.26797....1S