GRB 160508A

P. S. Marrocchesi (U of Siena), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama,
Y. Yamada (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), 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)
and the CALET collaboration:

The long-duration GRB 160508A (INTEGRAL-ACS trigger #7459; Konus-Wind trigger time on
14:32:38.795 UT) triggered the CALET Gamma-Ray Burst Monitor (CGBM) at 14:32:31.73 on
8 May 2016.  The burst signal was seen by all CGBM instruments.

The light curve of the SGM shows a single spike starting at T0, peaking at T0+6 sec,
and ending at T0+35 sec.  A hint of the emission is seen up to T0+~150 sec.
The T90 duration measured by the SGM data is 20.0 +- 1.6 sec (40-450 keV).

The CGBM data used in this analysis are provided by the Waseda CALET Operation Center
located at the Waseda University.

V. Bhalerao (IUCAA), V. Kumar (IUCAA), D. Bhattacharya (IUCAA), A. R. Rao (TIFR), S. Vadawale (PRL) report on behalf of the Astrosat CZTI collaboration:

Analysis of Astrosat data showed the detection of GRB 160508A
(Marrocchesi et al., GCN 19422
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 ; INTEGRAL-ACS trigger #7459; Konus-Wind
trigger time on 14:32:38.795 UT) in CZTI data. The source was clearly
detected in the 40-240 keV energy range. The light curve shows a single
peak at UT 14:32:37.7 and a peak count rate of 416.6 counts/sec above
the background (four quadrants summed together), with a total of 3373
counts. The local mean background count rate was 84.0 counts/sec.  Using
cumulative rates, we measure a T90 of 25.0 secs.

CZTI GRB detections are reported regularly on the payload site at
http://astrosat.iucaa.in/czti/?q=node/9. 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.