{
  "bibcode": "2021GCN.30006....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 Fermi/GBM GRB 210512.786 (trigger 642538568) with\nthe DDOTI wide-field imager at the Observatorio Astron��mico Nacional on Sierra\nSan Pedro Martir (http://ddoti.astroscu.unam.mx) from 2021-05-13 04:27 to 06:59\nUTC (from 9.5 to 12.1 hours after the trigger).\n\nWe observed a region covering aproximately 20 degrees in RA and 20 degrees in\ndeclination (6 instrumental fields or about 400 square degrees) centered on the\nfinal GBM position of 09:11:43.20 +14:09:36.0 J2000 and obtained 1680 seconds of\nexposure per 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 limits of\nw = 19.65 to 20.00 (interquartile range).\n\nWe thank the staff of the Observatorio Astronomico Nacional in San Pedro Martir.",
  "circularId": 30006,
  "createdOn": 1620921914000,
  "email": "alan@astro.unam.mx",
  "subject": "GRB 210512.786: DDOTI Upper Limits on the Afterglow",
  "submitter": "Alan M Watson at UNAM  <alan@astro.unam.mx>",
  "eventId": "GRB 210512.786"
}