GCN Circular 19605
Subject
GRB 160625B: TSHAO optical observations
Event
Date
2016-06-27T19:59:50Z (10 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Kusakin (Fesenkov Astrophysical Institute), P.
Minaev (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Volnova
(IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed the field of GRB 160625B (Dirirsa et al., GCN 19580; Burns
et al. GCN 19581) with Zeiss-1000 (East) 1-m telescopes of Tien Shan
Astronomical Observatory. We obtained several images in R filter
starting on June 26 (UT) 19:39:18. We detect optical afterglow of GRB
160625B (Troja et al., GCN 19588; Oates et al., GCN 19589).
Preliminary photometry of a combined image is following
Date UT start t-T0 Filter Exp. OT Err. UL
(mid, days) (s)
2016-06-26 19:39:18 0.91784 R 50*120 19.07 0.05 22.0
Photometry is based on nearby USNO-B1.0 stars
USNO-B.1_id R2
0969-0608423 16.38
0969-0608416 16.28
0969-0608335 15.00
0969-0608366 16.05
0969-0608449 17.38
0969-0608443 16.78
0969-0608456 16.79
The GRB 160625B triggered Fermi LAT and GBM (Dirirsa et al., GCN 19580;
Burns et al. GCN 19581), Konus-Wind (Svinkin et al. GCN 19604) and D.
Kann (GCN 19579) reported about CALET and SPI-ACS/INTEGRAL trigger.
A light curve of SPI-ACS/INTEGRAL can be found in
http://grb.rssi.ru/GRB160625B/GRB160625B_API-ACS.png
The SPI-ACS time profile of GRB 160625B consists of 3 episodes of total
duration about 750 seconds and compatible with time profiles reported by
GBM (Burns, GCN 19581) and Konus-Wind (Svinkin et al. GCN 19604).