[vsnet-grb-info 17154] GRB 151027A: THO optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18503
SUBJECT: GRB 151027A: THO optical observations
DATE:    15/10/28 02:54:58 GMT
FROM:    Veli-Pekka Hentunen at Taurus Hill Obs,A95  <veli-pekka.hentunen at kassiopeia.net>

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

We have detected GRB 151027A optical afterglow at Taurus Hill Observatory
(A95) using Meade 16" ACF 0.40-m/8.0  telescope and SBIG ST-8XME CCD.
The observations were started at 2015-10-27 17:11:39 (UT). Eight photometric
R filter and eight photometric V filter images with 300 sec exposure time were
taken.

The afterglow was detected at the following position RA 18:09:56.72 and
DEC +61:21:13.2.

The following magnitudes were obtained from the observations using
NOMAD1 1512-0243178 (R=13.200 and V=13.670) as a comparison star:

Tmid(h)+T0    Filter      Exp. time         Mag          Mag. Err.
13.393              R          4x300s              17.06      0.12
13.747              V          4x300s              17.56      0.25
14.103              R          4x300s              17.06      0.09
14.457              V          4x300s              17.49      0.10


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