{
  "bibcode": "2020GCN.28987....1W",
  "body": "Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), Simone Dichiara\n(GSFC/UMD), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Oc��lotl Lopez\n(UNAM), Diego Gonzalez (UNAM), Margarita Pereyra (UNAM), Srihari Ravi (ASU), and\nEleonora Troja (GSFC/UMD) report:\n\nWe observed the field of the Swift/BAT GRB 201203A (Dichiara et al., GCN Circ.\n28985) with the DDOTI wide-field imager at the Observatorio Astron��mico Nacional\non Sierra San Pedro Martir (http://ddoti.astroscu.unam.mx) from 2020-12-03\n06:57 UTC to 08:31 UTC (from 5.5 to 99 minutes after the trigger).\n\nWe observed a region covering aproximately 7 degrees in RA and 10 degrees in\ndeclination (about 70 square degrees), including the entire BAT uncertainty\nregion centered on 02:32:19.18 -26:32:15.0 (J2000). We obtained 4290 seconds of\nexposure in the w filter at high airmass and with almost full Moon. We\ncalibrated our images against the APASS DR10 catalog. Our 5-sigma limiting\nmagnitudes is 19.9.\n\nCompared to the USNO-B1, Pan-STARRS DR1, and APASS DR10 catalogs, we detect no\nuncataloged sources to our 5-sigma limit in the BAT 90% uncertainty region. No\nXRT detection is available at this moment.\n\nWe thank the staff of the Observatorio Astronomico Nacional in San Pedro Martir.",
  "circularId": 28987,
  "createdOn": 1606985652000,
  "email": "alan@astro.unam.mx",
  "subject": "GRB 201203A: DDOTI Observations",
  "submitter": "Alan M Watson at UNAM  <alan@astro.unam.mx>",
  "eventId": "GRB 201203A"
}