TITLE: GCN CIRCULAR NUMBER: 41222 SUBJECT: EP250802a: GROWTH-India Telescope optical upper limit DATE: 25/08/03 19:17:03 GMT FROM: V. Swain at IIT Bombay vishwajeet.s@iitb.ac.in
T. Mohan, V. Swain, A.P. Saikia, V. Bhalerao (IITB), D. Eappachen, G.C. Anupama, S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team:
We observed the field of EP transient EP250802a (Yin et al., GCN 41221), with 0.7m GROWTH-India Telescope (GIT). We started the observation at 2025-08-03 16:11:32 UT, i.e., ~29.5 hours after the EP trigger and obtained an exposure in r' filter. We do not detect any afterglow candidates within the uncertainty region of WXT localization. The photometric upper limit is as follows:
| MJD (mid) | Filter | tmid-t0 (day) | Exposure Time (sec) | Upper limit (AB) | | ------------ | ------ | ------------- | ------------------- | ---------------- | | 60890.67467 | r' | 1.23 | 300 | 20.8 |
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/.
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