{
  "bibcode": "2021GCN.29680....1B",
  "body": "Nat Butler (ASU), Alan M. Watson (UNAM), Rosa L. Becerra (UNAM), Simone\nDichiara (GSFC/UMD), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM),\nOc��lotl Lopez (UNAM), Diego Gonzalez (UNAM), Margarita Pereyra (UNAM),\nSrihari Ravi (ASU), and Eleonora Troja (GSFC/UMD) report:\n\nWe observed the field of the Swift/BAT GRB 210321A (Dichiara et al., GCN\nCirc.  29677) with the DDOTI wide-field imager at the Observatorio\nAstron��mico Nacional on Sierra San Pedro Martir (\nhttp://ddoti.astroscu.unam.mx) starting at 2021-03-21 08:56 UTC (from 1.7\nhours after the trigger).\n\nWe observed a region covering approximately 7 degrees in RA and 10 degrees\nin declination (about 70 square degrees) centered on the XRT position\n(Perri et al., GCN 29678) in the w filter.\n\nCompared to the USNO-B1, Pan-STARRS DR1, and APASS DR10 catalogs, we detect\na bright source at 08:39:50.04 +60:12:18.9 (J2000) fading from about w =\n18. This confirms the afterglow reported in UVOT observations by Siegel et\nal. (GCN Circ.  29679).\n\nWe thank the staff of the Observatorio Astronomico Nacional in San Pedro\nMartir.",
  "circularId": 29680,
  "createdOn": 1616338440000,
  "email": "natbutler@asu.edu",
  "subject": "GRB 210321A: DDOTI Afterglow Confirmation",
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "eventId": "GRB 210321A"
}