GCN Circular 21113

Veli-Pekka Hentunen and Markku Nissinen (Taurus Hill Observatory (A95),
Varkaus, Finland) report:

We have detected GRB 170519A optical afterglow at iTelescope observatory
T11 (Mayhill, New Mexico) using 0.51-m/6.8 Planewave CDK telescope and
FLI ProLine PL11002M CCD camera. The observations were started at
2017-05-19 05:25:24 (UT). Eleven unfiltered images and seven photometric
R filter images with 120 sec exposure time were taken.

The optical afterglow was detected at the position RA 10:53:42.46
and DEC +25:22:27.4.

The following magnitudes were obtained from the observations using
NOMAD1  1153-0183949 (R = 12.650) as a comparison star:

Tmid(s)+T0    Filter          Exp. time     Mag                 Mag err.
1119              unfiltered    3x120         15.52CR           0.03
1452              unfiltered    2x120         15.63CR           0.03
1906              R               3x120         15.98R              0.10
2324              R               2x120         16.08R              0.11
2806              unfiltered    4x120         16.07CR           0.05
3327              unfiltered    2x120         16.17CR           0.05
3795              R               2x120         16.50R              0.16


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