{
  "bibcode": "2021GCN.29957....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 HAWC GRB 210507.443 (run 1010067 event 1345) with the\nDDOTI wide-field imager at the Observatorio Astron��mico Nacional on Sierra San\nPedro Martir (http://ddoti.astroscu.unam.mx) from 2021-05-10 10:44 to 11:36 UTC\n(7 to 59 minutes after the trigger) and obtained 2520 seconds of exposure in the\nw filter.\n\nWe observed a region covering aproximately 7 degrees in RA and 10 degrees in\ndeclination (about 70 square degrees) including the entire HAWC uncertainty\nregion of 34.1 arcmin radius (90% containment, accounting for statistical\nuncertainty only and assuming a Gaussian uncertainty). We calibrated our images\nagainst the APASS catalog.\n\nWe do not detect any credible uncataloged sources to our 10-sigma limiting AB\nmagnitude of w = 20.55.\n\nWe thank the staff of the Observatorio Astronomico Nacional in San Pedro Martir.",
  "circularId": 29957,
  "createdOn": 1620394162000,
  "email": "alan@astro.unam.mx",
  "subject": "HAWC GRB 210507.443: DDOTI Upper Limit",
  "submitter": "Alan M Watson at UNAM  <alan@astro.unam.mx>",
  "eventId": "GRB 210507.443"
}