[vsnet-grb-info 16985] GRB 150910A: LCOGT FTN afterglow observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18266
SUBJECT: GRB 150910A: LCOGT FTN afterglow observations
DATE:    15/09/10 11:05:14 GMT
FROM:    Cristiano Guidorzi at Ferrara U,Italy  <guidorzi at fe.infn.it>

S. Dichiara, C. Guidorzi (U. Ferrara), S. Kobayashi (LJMU), A. Gomboc 
(U. Ljubljana), C. Mundell (U. Bath) on behalf of a larger collaboration 
report:

The 2-m LCOGT Faulkes Telescope North in Hawaii began observing Swift 
GRB 150910A (Pagani et al. GCN 18264) on September 10, 09:33:19 UT (28 
minutes after the burst trigger) with SDSS r and i filters. We clearly 
detect the optical afterglow (Pagani et al. GCN 18264; Zheng et al. GCN 
18265) with the following magnitudes:

Mid Time      Exposure       Filter       Magnitude
(min)           (s)
-------------------------------------------------------
29.0             60          r'           16.60 +- 0.02
35.6             60          i'           16.42 +- 0.02
-------------------------------------------------------

Calibration is done against SDSS magnitudes of nearby stars.