GRB 180711A
GCN Circular 22943
Subject
GRB 180711A: CALET Gamma-Ray Burst Monitor detection
Date
2018-07-13T04:07:39Z (7 years ago)
From
Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>
S. Ozawa (Waseda U), A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita, Y. Kawakubo,
A. Tezuka, S. Matsukawa, H. Onozawa, T. Ito, H. Morita, Y. Sone (AGU),
K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), I. Takahashi (IPMU),
Y. Asaoka, 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 weak GRB 180711A (INTEGRAL SPI-ACS trigger 8101; Konus-Wind
trigger time on 17:02:02.37 UT) triggered the CALET Gamma-ray
Burst Monitor (CGBM) at 17:02:00.439 UTC on 11 July 2018.
The burst signal was seen only by the CGBM SGM detector.
The burst light curve shows a single pulse which starts
at T+0.6 sec, peaks at ~T+2.1 sec, and ends at T+5.3 sec.
The T90 and the T50 durations measured by the SGM data are
4.3 +- 0.6 sec and 2.5 +- 0.6 sec (40-1000 keV), respectively.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1215363620/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at the Waseda University.
GCN Circular 23002
Subject
GRB 180711A: AstroSat CZTI detection
Date
2018-07-21T19:34:43Z (7 years ago)
From
Vidushi Sharma at IUCAA <vidushi@iucaa.in>
V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the Astrosat CZTI collaboration:
Analysis of Astrosat CZTI data showed the detection of a GRB 180711A, which was also detected by CALET (Sakamoto T. et al., GCN 22943).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with the strongest peak at 17:02:02.5 UT. The measured peak count rate is 327.3 cts/s above the background in combined data of four quadrants, with a total of 1186 cts. The local mean background count rate was 494.7 cts/s. Using cumulative rates, we measure a T90 of 4.9 s.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.