[vsnet-grb-info 17530] GRB 160131A: iTelescope optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18960
SUBJECT: GRB 160131A: iTelescope optical observations
DATE:    16/01/31 19:52:46 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 160131A optical afterglow at iTelescope observatory
(Siding Spring, Australia) using T9  0.32-m f/9 RCOS telescope and T17 and 
T32  0.43-m f/6.8 astrographs. The observations were started at 2016-01-31 
10:01:17 (UT). Several images using photometric R and V filters with 300 sec
and 120 sec exposure time were taken.

The afterglow was detected at the position RA 05:12:40.34 and DEC
-07:02:58.3.

The following magnitudes were obtained from the observations using
NOMAD1 0829-0078536 (R=15.390 and V=14.820) as a comparison star:

T32 observations
Tmid(s)+T0    Filter     Exp. time             Mag          Mag. Err.
6197              V          300s                   15.05          0.04
6796              V          300s                   15.17          0.04
7395              V          300s                   15.28          0.04

T17 observations
Tmid(s)+T0    Filter      Exp. time            Mag          Mag. Err.
6651              R           4x300s              15.71          0.02
7946              R           4x300s              15.96          0.02
11649            R           4x300s              16.56          0.03
12952            R           4x300s              16.68          0.03
14244            R           4x300s              16.86          0.04
15709            R           4x300s              16.99          0.04

T9 observations
Tmid(s)+T0    Filter      Exp. time             Mag          Mag. Err.
14761           V            5x120s              16.27          0.34
15454           V            5x120s              16.43          0.37
16190           V            5x120s              16.55          0.42
17083           V            5x120s              16.55          0.44
17767           V            5x120s              16.59          0.43
18452           V            5x120s              16.65          0.48
19179           V            5x120s              16.70          0.54
20295           V            5x120s              16.75          0.56

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