GCN Circular 17702

Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill
Observatory, Varkaus, Finland) report:

We have detected GRB 150413A optical afterglow at iTelescope
observatory T7 and T18 (AstroCamp Observatory, Nerpio, Spain)
using T7 0.43-m/6.8  and T18 0.32-m/8.0 astrographs. The observations
were started at 2015-04-13 20:29:13 (UT) and stopped at 23:54:26
(UT). Fifteen unfiltered images and four photometric R filter images with
120 sec exposure time were made.

The afterglow was detected at the following position RA 21:41:41.88
and DEC +71:50:27.9.

The following magnitude were obtained from the observations using
USNO-B1.0 1618-0098208 (R1=14.38) as a comparison star:

Telescope   Tmid(h)+T0    Filter             Exp. time         Mag
T7                6.611          unfiltered        2x120s          17.2CR  
T7                6.728          unfiltered        3x120s          17.4CR  
T7                6.976            R                 2x120s          17.7R 
T7                7.184            R                 2x120s          17.9R 
T18              9.508          unfiltered        4x120s          18.0CR
T18              9.685          unfiltered        4x120s          18.0CR
T18              9.904          unfiltered        2x120s          18.0CR

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