GCN Circular 19640

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
Not found
 
 
) 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
Not found
 
 
; Oates et 
al. GCN 19589
Not found
 
 
; Kuroda et al. GCN 19599
Not found
 
 
; Xu et al. GCN 19600
Not found
 
 
; D'Elia et 
al. GCN 19601
Not found
 
 
; Karpov et al. GCN 19603
Not found
 
 
; Mazaeva et al. GCN 19605
Not found
 
 
; 
Moskvitin et al. GCN 19611
Not found
 
 
; Gorbovskoy et al. GCN 19612
Not found
 
 
; Batsch et al. 
GCN 19615
Not found
 
 
; Cobb et al. GCN 19616
Not found
 
 
) 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.