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GCN Circular 32876

Subject
GRB 221028A: GIT optical upper limit
Date
2022-10-28T15:26:09Z (a year ago)
From
Harsh Kumar at Indian Inst of Tech,Bombay <harshkosli13@gmail.com>
H. Kumar (IITB), G. Waratkar, V. Swain (IITB), Anirban Dutta (IIA), G. C.
Anupama(IIA), K. Angail (IAO), V. Bhalerao (IITB), S. Barway (IIA) report
on behalf of the GIT team:

We observed GRB 221028A detected by Swift (A. Y. Lien et al. GCN # 32874)
with 0.7m GROWTH-India Telescope (GIT). We obtained two 300-sec exposures
in the r' filter. We did not detect any new source within a 5-arcsec radius
uncertainty circle around the Swift-XRT position (A. Y. Lien et al. GCN #
32874) in our stacked image. The upper limit follows as:

-------------------------------------------------------------------

 JD (mid) | T_mid-T0(hrs) | Filter | Lim_Mag (5-sigma) |

-------------------------------------------------------------------

 2459881.102968 | 1.2 | r' | > 20.24 |

-------------------------------------------------------------------

The magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016)
and not corrected for Galactic extinction.

The GROWTH India Telescope (GIT; Kumar et al. 2022
<https://iopscience.iop.org/article/10.3847/1538-3881/ac7bea>) is a 70-cm
telescope with a 0.7-degree field of view, set up by the Indian Institute
of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB)
with funding from DST-SERB and IUSSTF. It is located at the Indian
Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding
by the IITB alumni batch of 1994, which partially supports the operations
of the telescope. Telescope technical details are available at
https://sites.google.com/view/growthindia/.
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