[vsnet-grb-info 27230] GRB 210112A: 3.6m DOT optical detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29333
SUBJECT: GRB 210112A: 3.6m DOT optical detection
DATE:    21/01/20 06:14:31 GMT
FROM:    Dimple Panchal at ARIES, India  <dimplepanchal96 at gmail.com>

Dimple (ARIES), K. Misra (ARIES), A. Ghosh (ARIES), R. Gupta (ARIES),  A.
Kumar (ARIES), S.B. Pandey (ARIES) report:

We carried out the follow-up observations of GRB 210112A (Ambrosi et al.
GCN #29289) with Aries Devasthal Faint Object Spectrograph and Camera
(ADFOSC) mounted on the 3.6m Devasthal Optical Telescope (DOT) at Devasthal
observatory of Aryabhatta Research Institute of observational sciencES
(ARIES), India. The observations started on 2021-01-13 at 23:59:18 UT in
i-band (sdss). We observed a series of 6 images with an exposure time of
300 seconds each. We detect the afterglow at 1.933 days after the burst,
reported by Ambrosi et al. GCN #29289; Ursi et al. GCN #29293;  Kann et al.
GCNs #29296,29300; Siegel et al. GCN #29303, in i-band with a magnitude of
23.19 +- 0.166 (AB mag), calibrated with the nearby PanSTARRS field. Our
results are consistent with the power-law decay index of 0.8 reported by
Kann et al. #29296.

The magnitude is not corrected for Galactic extinction in the direction of
the burst.