TITLE: GCN CIRCULAR NUMBER: 38942 SUBJECT: GRB 250114B : GIT optical upper limit DATE: 25/01/14 16:28:42 GMT FROM: V. Swain at IIT Bombay vishwajeet.s@iitb.ac.in
M. Goyal, A.P. Saikia, V. Swain, T. Mohan, 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 INTEGRAL GRB 250114B (Gotz et. al., GCN 38938) with 0.7m GROWTH-India Telescope (GIT) in r' filter. We started the observation at 2025-01-14 14:43:01 UT, i.e., 1.46 hours after the INTEGRAL trigger. We did not detect any new source in our stacked image within the uncertainty region reportedd in GCN 38938. The obtained upper limit is as follows:
| MJD (mid) | Filter | Exposure (s) | Limiting Magnitude (AB) | | ----------------- |------- | ------------------ | -------------- | | 60689.62099 | r' | 3 x 300 | 20.3 |
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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