TITLE: GCN CIRCULAR NUMBER: 36696 SUBJECT: GRB240615A: 1.3m DFOT optical upper limit DATE: 24/06/19 06:22:27 GMT FROM: ANSHIKA GUPTA at ARIES <anshika05180@gmail.com> We observed the field of GRB 240615A detected by Fermi GBM (GCN #36671) and Swift/BAT-GUANO (GCN #36672) and using the 1.3m Devasthal Fast Optical Telescope (DFOT) located at the Devasthal observatory of Aryabhatta Research Institute of observational sciencES (ARIES), Nainital, India. The observation started on 2024-06-16 at 20:07:06 UTC, i.e., ~ 26.25 hours after the trigger. 24 frames of 300 sec exposure were acquired in the R band. We do not detect the optical afterglow (earlier reported in #GCN 36676, #GCN 36680) in the stacked image down to a limiting magnitude of 22.8. The photometric calibration is performed using the standard stars from the USNO-B1.0 catalog. View this GCN Circular online at https://gcn.nasa.gov/circulars/36696. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...