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

GCN Circular 21125

GRB 170514A CALET Gamma-Ray Burst Monitor detection
2017-05-22T11:59:25Z (7 years ago)
Takanori Sakamoto at AGU <>
S. Matsukawa, A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama,
Y. Yamada, A. Tezuka (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),
I. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu,
T. Tamura (Kanagawa U), W. Ishizaki (ICRR), M. L. Cherry (LSU),
S. Ricciarini (U of Florence), A. V. Penacchioni, P. S. Marrocchesi (U of Siena)
and the CALET collaboration:

The long-duration GRB 170514A (Bissaldi et al., GCN Circ. 21094;
Konus-Wind trigger time on 04:18:42.056 UT) triggered the CALET
Gamma-ray Burst Monitor (CGBM) at 04:19:59.08 on 14 May 2017.
The burst signal was seen by all CGBM instruments.  Because of a
problem in one of the ground alert processing script, the GCN notice
was not distributed automatically for this event.  Note that the CGBM
triggered at the 2nd bright burst episode which was ~1 min after the
initial peak.

The light curve of the SGM shows two separated peaks.  The initial peak,
which triggered Fermi-GBM and Konus-Wind, shows the emission around T-70 sec.
The 2nd peak starts from T-1 sec, peaks at T+0 sec and ends at T+10 sec.
The T90 duration measured by the SGM data is 7.8 +- 0.6 sec (40-1000 keV).

The 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