{
  "bibcode": "2021GCN.29993....1P",
  "body": "Margarita Pereyra (UNAM), Nat Butler (ASU), Alan M. Watson (UNAM),\nEleonora Troja (GSFC/UMD),  Simone Dichiara (GSFC/UMD), Rosa L. Becerra\n(UNAM), William H. Lee (UNAM), Oc��lotl L��pez,  Diego Gonzalez (UNAM),\nAlexander Kutyrev (GSFC/UMD), and Srihari Ravi (ASU), report:\n\nWe observed the field of the likely short Fermi GRB 210510A (trigger\n642367205, GCN #29981, Fermi GBM Team) with the DDOTI/OAN wide-field imager\nat the Observatorio Astron��mico Nacional on Sierra San Pedro M��rtir (\nhttp://ddoti.astroscu.unam.mx) on 2021-05-11 from 03:24 to 10:45 UTC (8.1\nto  15.4 hours after the event).\n\nWe observed a region of 20.4 degrees in RA by 20.4 degrees in declination,\nwith a 3 x 2 grid, centered on the Fermi GBM Final Position RA = 192.330,\nDec = +44.860 (J2000 degrees). This region contains 6 instrumental fields\nor about 400 square degrees. We obtained 2280 to 2400 seconds of exposure\nper instrumental field in the w filter. We obtained AB photometry by\ncalibration against the APASS catalog.\n\nWe detect no likely candidate for the afterglow to our 10-sigma upper\nlimits of w = 20.20 to 20.42 (interquartile range).\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir.",
  "circularId": 29993,
  "createdOn": 1620762918000,
  "email": "mpereyra@astro.unam.mx",
  "subject": "Fermi GRB 210510A: DDOTI Upper Limits on the Afterglow",
  "submitter": "Emma Margarita Pereyra Talamantes at IA-UNAM Ensenada  <mpereyra@astro.unam.mx>",
  "eventId": "GRB 210510A"
}