{
  "bibcode": "2019GCN.25769....1W",
  "body": "Alan M. Watson (UNAM), Nat Butler (ASU), Eleonora Troja (GSFC/UMD), Rosa L.\nBecerra (UNAM), Simone Dichiara (GSFC/UMD), Diego Gonzalez (UNAM), Alexander\nKutyrev (GSFC/UMD), William H. Lee (UNAM), Margarita Pereyra\n<mpereyra@astro.unam.mx> (UNAM), and Tanner Wolfram (ASU) report:\n\nWe observed the field of HAWC-190916A (Ayala, GCN Circ 25766, 25768) with the\nDDOTI wide-field imager at the Observatorio Astronomico Nacional on Sierra San\nPedro Martir (http://ddoti.astroscu.unam.mx) from 2019-09-17 03:14 to 2019-09-17\n04:17 UTC (2.0 to 3.1 hours after the trigger).\n\nWe obtained a total of 2340 seconds of exposure in the w filter. We calibrated\nour images against the APASS catalog. Our 10-sigma limiting magnitude is w =\n19.5.\n\nComparing our 10-sigma detections against the USNO-B1 catalog, we detect no\nreliable uncataloged sources with significant fading within 1.7 degrees of the\nnominal coordinates.\n\nWe thank the staff of the Observatorio Astronomico Nacional in San Pedro Martir.",
  "circularId": 25769,
  "createdOn": 1568695182000,
  "email": "alan@astro.unam.mx",
  "subject": "HAWC-190916A: DDOTI Optical Observations",
  "submitter": "Alan M Watson at UNAM  <alan@astro.unam.mx>",
  "eventId": "HAWC-190916A"
}