{
  "bibcode": "2021GCN.30135....1P",
  "body": "Margarita Pereyra (UNAM), Alan M. Watson (UNAM), Nat Butler (ASU), Camila\nAngulo,  Simone Dichiara (GSFC/UMD), Rosa L. Becerra (UNAM), William H. Lee\n(UNAM), Oc��lotl L��pez,  Eleonora Troja (GSFC/UMD), Diego Gonzalez (UNAM),\nAlexander Kutyrev (GSFC/UMD), and Srihari Ravi (ASU), report:\n\nWe observed the field of the likely Long Fermi GRB 210606A  (trigger\n644644567, GCN #30131, 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 2021/06/06 from 04:12:31.000 to\n06:46:24.000 UTC (0.27 to 2.83 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: 177.630000,\nDEC: -0.470000 (J2000 degrees). This region contains 6 instrumental fields\nor about 400 square degrees. We obtained 1075 to 1200 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 candidates for the afterglow to our 10-sigma upper\nlimits of w = 19.64 to 19.93 (inter-quartile).\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir.",
  "circularId": 30135,
  "createdOn": 1623007775000,
  "email": "mpereyra@astro.unam.mx",
  "subject": "Fermi GRB 210606A: DDOTI Upper Limits on the Afterglow",
  "submitter": "Emma Margarita Pereyra Talamantes at IA-UNAM Ensenada  <mpereyra@astro.unam.mx>",
  "eventId": "GRB 210606A"
}