[vsnet-grb-info 13076] GRB 130420A: Weihai Optical Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14413
SUBJECT: GRB 130420A: Weihai Optical Observations
DATE:    13/04/20 13:57:41 GMT
FROM:    Dong Xu at DARK/NBI  <dong.dark at gmail.com>

D. Xu (DARK/NBI), C. Cao, S.M. Hu (SDU) report:

We observed the field of GRB 130420A (Page et al., GCN 14406) using
the 1m telescope located in Weihai, Shandong Province, China.
Observations started at 11:41:32 UT, 2013-04-20 (i.e., 4.218 hr after
the BAT trigger) and 12x180s I-band frames were obtained.

The optical afterglow (Page et al., GCN 14406) is clearly detected in
our stacked image to be of I=19.4 mag, calibrated with nearby USNO B1
stars. It has decayed by about 0.5 mag, compared to the measurement in
Watson et al. (GCN 14409).

We thank Dayong Ren for carrying out these observations.