GCN Circular 16789

Subject

GRB 140907A : Optical observations from Nanshan

Event

Date

2014-09-07T18:03:54Z (11 years ago)

From

Dong Xu at DARK/NBI <dong.dark@gmail.com>

D. Xu (DARK/NBI), X. Gao (Urumqi No.1 Senior High School, Xinjiang),
G.-J. Feng, A. Esamdin, L. Ma (XAO), Z.-J. Xu (Nanjing Putian
Telecommunications Co. Ltd., Jiangsu) report:

We observed the field of GRB 140907A (Krimm et al., GCN 16788Loading...
 
 ) using
the 35cm robotic telescope and the 1m optical telescope located at
Nanshan, Xinjiang, China. The observations started at 16:18:42 UT on
2014-09-07 at the 35cm telescope without any filter, and 16:34:28 UT
at the 1m telescope in the R filter.

The afterglow is well detected in our images at coordinates

R.A. (J2000) = 03:12:34.98
Dec. (J2000) = +46:36:17.2

Error radius: ~ 0.7 arcsec

which is fully consistent with the UVOT position. Generally, the
afterglow has been decaying, and follows are the preliminary
measurements from the 35cm telescope:

     Mid-Time              Mag
2014/09/07.68001     16.7
2014/09/07.68083     16.7
2014/09/07.68164     16.7
2014/09/07.68244     16.9
2014/09/07.68325     17.0
2014/09/07.68405     17.1
2014/09/07.68485     17.0
2014/09/07.68565     16.9
2014/09/07.68646     17.2

with a typical error of 0.2 magnitude, calibrated with the R-band
catalog of NET CMC-14.

Observations are ongoing.