GCN Circular 20006
Subject
GRB 160925A: Kottamia R-band observation
Date
2016-10-06T23:05:13Z (8 years ago)
From
Gamal B. Ali at NRIAG <gamalali@lycos.com>
G. B. Ali, Y. Hendy, A. Takey, N. Essam, and A. Essam (NRIAG, Egypt)
report on behalf of the Kottamia collaboration:
We observed the field of the Fermi GRB 160925A (trigger #496473540) with
the 1.88m telescope of the KAO (Kottamia Astronomical Observatory),
Egypt. The observation was performed in the Rc-band at the Newtonian
camera (F4.8) and started at 2016-09-29 T19:58:17 UT (~4.08 day after
the burst).
We obtained several exposures in the Rc-band each one with 300s exposure
time. We clearly detected the optical transient (Lipunov et al., GCN
19938; Guidorzi et al., GCN 19939).
The following accurate photometry is obtained for the transient:
UT (Start) Rc error*
2016-09-29T19:58:17 17.260 0.011
2016-09-29T20:03:31 17.232 0.011
2016-09-29T20:08:42 17.252 0.012
2016-09-29T20:13:53 17.326 0.013
2016-09-29T20:19:04 17.267 0.012
2016-09-29T20:24:15 17.223 0.011
2016-09-29T20:29:26 17.305 0.011
2016-09-29T20:34:37 17.281 0.012
2016-09-29T20:39:48 17.239 0.011
----------------------------------------------------
(*) Poisson noise error only.
The Photometric calibration is based on nearby USNO-B1.0 stars
USNO-B1.0 R2
0750-0813981 13.69
0750-0813991 14.20
0750-0813958 14.93
0750-0813917 15.62
[GCN OPS NOTE(08oct16): Per author's request, the signature block and the appended
copy of the 19947 circular have been removed.]