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GCN Circular 38187

Subject

GRB 241107A: GROWTH-India telescope optical upper limit

Date

2024-11-13T02:31:29Z (5 months ago)

From

Varun Bhalerao at IIT Bombay <varunb@iitb.ac.in>

Via

Web form

T. Mohan, G. Waratkar, A.P. Saikia, V. Swain, R. Kumar, V. Bhalerao (IITB), G.C. Anupama, S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team:

We observed the field of the GRB 241107A (SVOM/GRM team, GCN 38125

, Rodi et al., GCN , IPN GCN ) with the 0.7m GROWTH-India Telescope (GIT). Once arcminute positions became available (Mereghetti et al., GCN and DeLaunay et al., GCN ), we started observations at 2024-11-12 20:10:35 UT, about 4.8 days after the trigger. We obtained multiple images of 360s each in r' and i' filters. We did not detect any new source in our stacked image around the coordinates given by INTEGRAL IBIS or Swift BAT.

Below is the upper limit in the stacked images:

MJD (mid)	Filter	Exposure (s)	Limiting Magnitude (AB)
60626.85364	r'	6x360	20.8
60626.87984	i'	6x360	20.6

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

The GROWTH India Telescope (GIT, Kumar et al. 2022) 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/.