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GCN Circular 37808

Subject

GRB 241017A: GROWTH-India Telescope optical upper limit

Date

2024-10-18T06:01:57Z (6 months ago)

From

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

Via

Web form

T. Mohan, A.P. Saikia, R. Kumar, V. Swain, 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 241017A (SVOM/ECLAIRs team, GCN 37799

) with the 0.7m GROWTH-India Telescope (GIT). With the current GIT camera with a field of view of 11' x 7', observed 12 tiles to cover the area for the statistical and systematic uncertainity regions mentioned in GCN .

Obserations started at 2024-10-17 19:02:04 UT, about 15.1 hours after the SVOM/ECLAIRs trigger. Each tile had image of 360s in r' filter. We did not detect any new source in our images. In particular, we do not find any source in the error circle of uncatalogued source at 356.1750d, +15.6574d reported in the automated Swift follow-up (GCN #37800

, https://gcn.gsfc.nasa.gov/other/21723.counterpart). Due to the proximity to the bright moon (~28 deg), the images were shallower than usual.

MJD mid	RA	Dec	Lim Mag (5-sigma)
60600.79518	356.305	15.731	19.2
60600.79972	356.637	15.726	19.3
60600.80424	356.238	15.725	19.2
60600.81313	356.515	15.894	19.3
60600.81766	356.367	15.892	19.1
60600.82209	356.382	15.563	19.5
60600.82654	356.248	15.559	19.5
60600.83556	356.101	15.723	19.1
60600.84000	356.511	15.561	19.4
60600.84452	356.096	15.892	19.1
60600.84894	356.376	15.729	19.4
60600.85339	356.513	15.734	19.6

The magnitude are 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/.