GCN Circular 37961
Subject
GRB 241029A: GROWTH-India Telescope optical follow up
Event
Date
2024-10-30T10:03:34Z (a year ago)
Edited On
2024-10-30T15:33:33Z (a year ago)
From
vishwajeet.s@iitb.ac.in
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of V. Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>
Via
Web form
A.P. Saikia, T. Mohan, 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 GRB 241029A by Fermi/GBM (Fermi GBM team, GCN 37932), SVOM/ECLAIRs & SVOM/GRM (Schanne et al., GCN 37934; Wang et al., GCN 37935) with 0.7m GROWTH-India Telescope (GIT). We started the observation at 2024-10-29 14:08:55 UT, i.e., 11.8 hours after the Fermi GBM trigger. We obtained multiple exposures of 360 seconds in r' filter. We clearly detected the afterglow in our stacked image at the positions given by TRT (Jiang et. al., GCN 37937). The photometry result follows as:
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| JD (mid) | t-t0 (hours) | Filter | Total Exposure (s) | Magnitude (AB) |
| ----------------- | ----------- |------- | ------------------ | -------------- |
| 2460613.16666 | 13.6 | r' | 6x360 | 20.97 +/- 0.10 |
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Our result is consistent with Jiang et al., (GCN 37937), Lin et al., (GCN 37939), Jiang et al., (GCN 37940), Francile et al., (GCN 37941), Ackley et al., (GCN 37943), Odeh et al., (GCN 37944), Moskvitin et al., (GCN 37954).
The measurement 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/.