{
  "bibcode": "2019GCN.25737....1P",
  "body": "Margarita Pereyra <mpereyra@astro.unam.mx> (UNAM), Alan M. Watson (UNAM),\nNat Butler (ASU), Simone Dichiara (GSFC/UMD), Rosa L. Becerra (UNAM), Diego\nGonzalez (UNAM), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM),\nEleonora Troja (GSFC/UMD), Gabriele Minervini (INAF/IAPS-Rome)  and Tanner\nWolfram (ASU) report:\n\nWe observed LIGO/Virgo S190910d event (Badaracco F; LVC et al.; GCN #25695)\nwith the DDOTI/OAN wide-field imager at the Observatorio Astronomico\nNacional on Sierra San Pedro Martir (http://ddoti.astroscu.unam.mx) from\n2019-09-10 04:25 to 2019-09-10 08:15 UTC ( ~ 3.0 to 7.8 hours after the\nevent).\n\nWe observed approximately 289 square degrees of the sky, with 5 pointings\ncentered on 17:30:00.089 +19:08:01.30, 17:49:53.330 +17:34:38.58,\n17:49:53.330 +24:35:33.03, 18:09:04.387 +22:40:56.15 and 18:09:46.574\n+30:03:26.65. We obtained about 18, 36, 18, 30 and 18 minutes total\nexposure on each pointing, respectively. These regions include about 6% of\nthe 2D probability in the current BAYESTAR map and 5% of the 2D probability\nin the LALInference map.\n\nWe calibrated our images against the APASS catalog. Our 10-sigma limiting\nmagnitude are typically between w = 18.04 and w = 18.96.\n\nComparing our 10-sigma detections against the USNO-B1 catalog, we detect no\nuncataloged sources with significant fading.\n\nWe thank the staff of the Observatorio Astronomico Nacional in San Pedro\nMartir.",
  "circularId": 25737,
  "createdOn": 1568354564000,
  "email": "mpereyra@astro.unam.mx",
  "subject": "LIGO/Virgo S190910d: No Counterparts in DDOTI/OAN Optical Observations",
  "submitter": "Emma Margarita Pereyra Talamantes at IA-UNAM Ensenada  <mpereyra@astro.unam.mx>",
  "eventId": "LIGO/Virgo S190910d"
}