{
  "submitter": "pawarpankaj1492@gmail.com",
  "body": "Pankaj Pawar, Anshika Gupta, Debalina Kar, Dhruv Jain and Kuntal Misra (ARIES) report:\n\nWe 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.\n\nThe 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.\n\nThe limiting magnitude in the stacked image is:\nr > 22.4 mag (AB)\n\nThe magnitude is calibrated against the Pan-STARRS PS1 catalog.\n\nWe thank the staff of Devasthal for their assistance during these observations.",
  "submittedHow": "web",
  "subject": "GRB 260421B: 3.6m DOT optical observation",
  "createdOn": 1776938419621,
  "format": "text/plain",
  "circularId": 44396,
  "eventId": "GRB 260421B"
}