GCN Circular 44396
Subject
GRB 260421B: 3.6m DOT optical observation
Event
Date
2026-04-23T10:00:19Z (11 hours ago)
From
pawarpankaj1492@gmail.com
Via
Web form
Pankaj Pawar, Anshika Gupta, Debalina Kar, Dhruv Jain and Kuntal Misra (ARIES) report:
We observed the field of GRB 260421B (Fermi GBM team, GCN 44360; Zhao et al., GCN 44362) using the 3.6m Devasthal Optical Telescope (DOT) located at Devasthal of the Aryabhatta Research Institute of observational sciencES (ARIES), India.
The observations began on 2026-04-21 at 21:24:53 UT, approximately 17 hours after the trigger time. We obtained 2*300s frames in the SDSS r filter. We do not detect the optical counterpart (He et al., GCN 44363; Álvarez et al., GCN 44364; Turpin et al., GCN 44365; Wu et al., GCN 44366; Lipunov et al., GCN 44367; Schneider et al., GCN 44368; Li et al., GCN 44377; Pérez-Fournon et al., GCN 44383; Mo et al., GCN 44384; and Shi et al., GCN 44388) within the error circle, nor do we see a source at the reported location of the transient.
The limiting magnitude in the stacked image is:
r > 22.4 mag (AB)
The magnitude is calibrated against the Pan-STARRS PS1 catalog.
We thank the staff of Devasthal for their assistance during these observations.