{
  "subject": "LIGO/Virgo S190828j: No Counterparts in DDOTI/OAN Optical Observations",
  "eventId": "LIGO/Virgo S190828j",
  "bibcode": "2019GCN.25562....1P",
  "createdOn": 1567135078000,
  "circularId": 25562,
  "submitter": "Emma Margarita Pereyra Talamantes at IA-UNAM Ensenada  <mpereyra@astro.unam.mx>",
  "email": "mpereyra@astro.unam.mx",
  "body": "Margarita Pereyra <mpereyra@astro.unam.mx> (UNAM), Simone Dichiara\n(GSFC/UMD), Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra\n(UNAM), Diego Gonzalez (UNAM), Alexander Kutyrev (GSFC/UMD), William H. Lee\n(UNAM), Eleonora Troja (GSFC/UMD), Gabriele Minervini (INAF/IAPS-Rome)  and\nTanner Wolfram (ASU) report:\n\nWe observed LIGO/Virgo S190828j event (Minazzoli et al., GCN #25497) with\nthe DDOTI/OAN wide-field imager at the Observatorio Astronomico Nacional on\nSierra San Pedro Martir (http://ddoti.astroscu.unam.mx) from 2019-08-28\n08:00 to 2019-08-28 11:57 UTC (1.4 to 5.4 hours after the event).\n\nWe observed approximately 231 square degrees of the sky, with four\npointings centered on 22:10:13.126 +45:18:17.26, 21:45:30.680 +39:42:01.13,\n21:25:37.437 +32:53:21.57 and 21:07:43.518 +24:13:55.90. We obtained about\n21, 16, 18 and 86 minutes total exposure on each pointing, respectively.\nThese regions include about 35% of the 2D probability in the current\nBAYESTAR map.\n\nWe calibrated our images against the APASS catalog. Our 10-sigma limiting\nmagnitude are typically between w = 19.2 and w = 19.8.\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.\n\n-- \n*Dr. Margarita Pereyra *\n\n*FFTF, Schlumberger Foundation Alumnae*\n----------------------------------------------------------------------------------------------------------------\n\n*Catedr��tico Conacyt*\n\n*Instituto de Astronom��a de la UNAM,*\n\n*Km. 107 Carretera Tijua**na-Ensenada, *\n\n*Ensenada Baja California, M��xico. C.P. 22860*\n\nOficina: 405\n\nSkype: margarita-pereyra"
}