[vsnet-grb-info 14850] GRB 140423A, Optical Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16164
SUBJECT: GRB 140423A, Optical Observations
DATE:    14/04/24 10:12:16 GMT
FROM:    Shashi Bhushan Pandey at ROTSE  <shaship at umich.edu>

S. B. Pandey, Brajesh Kumar and Aditi Agarwal (ARIES Nainital India,
on behalf of larger Indian GRB collaboration)

We observed the Swift GRB 140423A field (Sonbas et al., GCN 16142)
using 1.3m DFOT telescope at Devasthal operated by ARIES Nainital, India.
Observations were started at 14:36:07 UT on 2014-04-23 (~6 h after the
burst).
The optical counterpart of the burst (Elenin et al., GCN 16143; Kaur et
al.,
GCN 16144; Ferrante et al., GCN 16145; Chester et al., GCN 16147) was
clearly
detected in individual frames of exposure time 300s each.

The preliminary photometry is as following:

 (UT)Start     filter    exp(sec)       mag
 14:36:07     R_c       300            20.12 +/- 0.08
 14:42:50     I_c         300           19.76 +/- 0.15

The photometry was performed in comparison to nearby USNO stars.

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