//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 21255 SUBJECT: GRB 170614A CALET Gamma-Ray Burst Monitor detection DATE: 17/06/16 23:00:32 GMT FROM: Takanori Sakamoto at AGU I. Takahashi (IPMU), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama, Y. Yamada, A. Tezuka, S. Matsukawa (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), 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 170614A (Fermi-GBM trigger #519133191; INTEGRAL SPI-ACS trigger #7869; Konus-Wind trigger time on 11:39:55.892) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 11:39:43.86 on 14 June 2017. The burst signal was seen by the all CGBM instruments. The light curve of the SGM shows multiple peaks. The entire burst episode starts at T+~2 sec, peaks at T+~20 sec and ends at T+~40 sec. The T90 duration measured by the SGM data is 22 +- 1 sec (40-1000 keV). The light curve is available at http://cgbm.calet.jp/cgbm_trigger/flight/1181475101/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 21256 SUBJECT: GRB 170614A: AstroSat CZTI detection DATE: 17/06/19 10:49:18 GMT FROM: Vidushi Sharma at IUCAA V. Sharma (IUCAA), V. Bhalerao (IIT-B), D. Bhattacharya (IUCAA), 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 long-duration GRB 170614A, which was also detected by Fermi-GBM (trigger #519133191), INTEGRAL SPI-ACS (trigger #7869), Konus-Wind (trigger time on 11:39:55.892) and CALET (Takahashi et al, GCN 21255). The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks emission with the strongest peak at 11:40:04.89 UT, ~21 s after the CALET Trigger. The measured peak count rate is 593.1 cts/s above the background in combined data of four quadrants, with a total of 5775 cts. The local mean background count rate was 369.9 cts/s. Using cumulative rates, we measure a T90 of 21.4 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.