TITLE: GCN CIRCULAR NUMBER: 38187 SUBJECT: GRB 241107A: GROWTH-India telescope optical upper limit DATE: 24/11/13 02:31:29 GMT FROM: Varun Bhalerao at IIT Bombay varunb@iitb.ac.in
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 38164, IPN GCN 38165) with the 0.7m GROWTH-India Telescope (GIT). Once arcminute positions became available (Mereghetti et al., GCN 38172 and DeLaunay et al., GCN 38177), 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 |
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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/.
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