[vsnet-grb-info 18192] GRB 160625B: LCOGT FTN observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19640
SUBJECT: GRB 160625B: LCOGT FTN observations
DATE:    16/07/01 16:43:58 GMT
FROM:    Cristiano Guidorzi at Ferrara U,Italy  <guidorzi at fe.infn.it>

C. Guidorzi (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell (U. Bath), 
A. Gomboc (U. Nova Gorica), on behalf of a large collaboration report:

We observed Fermi GRB 160625B (Dirirsa et al. GCN 19580) with the 2-m 
LCOGT Faulkes Telescope North in Hawaii on July 01 from 11:12 UT to 
12:46 UT with the SDSS-r filter for a total exposure of 1500 s. We 
clearly detect the optical afterglow (Troja et al. GCN 19588; Oates et 
al. GCN 19589; Kuroda et al. GCN 19599; Xu et al. GCN 19600; D'Elia et 
al. GCN 19601; Karpov et al. GCN 19603; Mazaeva et al. GCN 19605; 
Moskvitin et al. GCN 19611; Gorbovskoy et al. GCN 19612; Batsch et al. 
GCN 19615; Cobb et al. GCN 19616) with a magnitude of r=21.15 +- 0.15 
mag at a mid epoch of 5.5 days post burst, as calibrated against nearby 
USNOB1 stars.