TITLE:   GCN CIRCULAR
NUMBER:  34955
SUBJECT: GRB 231104A: 3.6m DOT optical upper limit
DATE:    23/11/06 18:02:21 GMT
FROM:    Rahul Gupta at Aryabhatta Research Institute of Observational Sciences (ARIES) India <rahulbhu.c157@gmail.com>

Rahul Gupta, Amit K. Ror, Amar Aryan, and S. B. Pandey (ARIES) report on
behalf of a larger collaboration:

We observed the field of GRB 231104A detected by Fermi (Fermi GBM team, GCN
34937; Principe et al., GCN 34943), Swift (Page et al., GCN 34938), and
AstroSat (Navaneeth et al., GCN 34945) using the 3.6m Devasthal Optical
Telescope of ARIES Nainital. We have taken multiple frames having an
exposure time of 100 sec in the r and i filters, respectively. We do not
find any evidence of an afterglow candidate inside the Swift/XRT enhanced
error circle (Goad et al., GCN 34940), consistent with other non-detections
(Strausbaugh et al., GCN 34939; Kuin et al., GCN 34941; Odeh et al., GCN
34946; and Zhu et al., GCN 34951). We obtained the limiting mag of ~ 24 mag
(r-band) at ~ 0.9 days post-detection.

The limiting magnitudes quoted are not corrected for the Galactic
extinction in the direction of the burst. Photometric calibration is
performed using the standard stars from the Pan-STARRS catalog.

This circular may be cited. 3.6m Devasthal Optical Telescope (DOT) is
the recently commissioned facility in the Northern Himalayan region of
India (long:79 41 04E, lat:29 21 40N, alt:2540m) owned and operated by the
Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital (
https://www.aries.res.in). Authors of this GCN circular thankfully
acknowledge consistent support from the staff members to run and maintain
the 3.6m DOT.