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 24339

GRB 190427A: CALET Gamma-Ray Burst Monitor detection
2019-04-29T07:47:46Z (5 years ago)
Valentin Pal'shin at AGU <>
N. Cannady (LSU),
A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),
Y. Asaoka, S. Ozawa, S. Torii (Waseda U),
T. Tamura, Y. Shimizu (Kanagawa U), M. L. Cherry (LSU),
S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena)
and the CALET collaboration:

The short GRB 190427A (Swift-BAT trigger #900730:
Tohuvavohu et al., GCN Circ. 24261, Ukwatta et al., GCN Circ. 24330;
Fermi GBM detection: Malacaria, von Kienlin and Meegan, GCN Circ. 24293)
was detected in ground analysis of the CALET Gamma-ray Burst Monitor (CGBM)
data near the Swift-BAT trigger time at T0=04:34:14.95 UT on 27 April 2019.
The burst signal was seen only by the SGM detector.
The source location (Ukwatta et al., GCN Circ. 24330) was out
of the HXM detectors' FOVs and likely blocked by the ISS structures.

The burst light curve shows a single bin (125 ms) spike
with a signal-to-noise ratio of 9.0 in the 40-1000 keV range.

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