Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 31730

GRB 220310A: CALET Gamma-Ray Burst Monitor detection
2022-03-10T08:13:34Z (2 years ago)
Valentin Pal'shin at AGU <>
A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),
Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (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 long GRB 220310A detected by MAXI/GSC (Negoro et al., GCN Circ. 31725)
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 00:27:58.325 UTC
on 10 March 2022
The burst signal was seen by all CGBM detectors.

The burst light curve shows a multi-peaked structure which starts
at T+0.5 sec, peaks at T+33.6 sec,and ends at T+47.0 sec.
The T90 and T50 durations measured by the SGM data are 33.1 +- 8.3 sec
and 12.9 +- 1.2 sec (40-1000 keV), respectively.

The ground processed light curve is available at

The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at the Waseda University.
Looking for U.S. government information and services? Visit