TITLE: GCN CIRCULAR NUMBER: 38574 SUBJECT: GRB 241215A: GROWTH-India telescope optical upper limit DATE: 24/12/15 19:47:09 GMT FROM: V. Swain at IIT Bombay vishwajeet.s@iitb.ac.in
T. Mohan, 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 241215A (Mereghetti et al., GCN 38573) with the 0.7m GROWTH-India Telescope (GIT). Observation started at 2024-12-15T15:27:41 UT, about 1.57 hours after the trigger. We responded to the coordinates reported in GCN notices (trigger No 11001, RA = 10.5810 deg, DEC = 32.4791 deg) and obtained multiple images of 300s in r' filter. With current FOV of 7.5 x 11 arcmin and scale: 0.2 arcsec/pixel, we covered 71 percent of the localization centered around refined coordinates given in GCN 38573.
The obtained upper limit in our stacked image is:
| MJD (mid) | Filter | Exposure (s) | Limiting Magnitude (AB) | | ----------- | ------ | ------------ | ----------------------- | | 60659.65319 | r' | 5x300 | 19.9 | |
The upper limit is consistent with Lipunov et el., GCN 38572.
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/.
View this GCN Circular online at https://gcn.nasa.gov/circulars/38574. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...