{
  "bibcode": "2020GCN.26754....1P",
  "body": "Margarita Pereyra (UNAM), Eleonora Troja (GSFC/UMD),  Alan M. Watson\n(UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), Diego Gonzalez (UNAM),\nAlexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), and Tanner Wolfram\n(ASU), Simone Dichiara (GSFC/UMD) report:\n\nWe observed the field of GRB 200114A detected by Fermi/GBM and AstroSat\nCZTI (Fermi GBM Team, GCN Circ. 26735; Gaikwad et al., GCN Circ. 26746),\nwith the DDOTI/OAN wide-field imager at the Observatorio Astron��mico\nNacional on Sierra San Pedro Martir (http://ddoti.astroscu.unam.mx) from\n2020-01-14 09:27 to 2020-01-14 13:18 UTC (5.78 to 9.63 hours after the\nevent).\n\nWe observed a region of 13.6 degrees in RA by 10.2 degrees in declination\ncentered on the peak of the Fermi GBM on-ground localization at 13:17:31\n-00:19:12 J2000 (Fermi GBM Team, GCN Circ. 26735). This region contains\nabout 140 square degrees. We obtained about 30 to 36 minutes total exposure\nacross the region. We calibrated our images against the APASS catalog. Our\n10-sigma limiting magnitude are typically between w = 18.70 and w = 18.80.\n\nWe found only one source with significant fading above our 10-sigma limit.\nThis source is at 12:55:26.84 -00:21:23.8 J2000 and fades from w =  17.0 to\nw = 19.5 during our observations. However, the Pan-STARRS DR1 shows a 19\nmag star at the source position, which rules it out as a GRB optical\ncounterpart.\n\nComparing to the USNO-B1 and Pan-STARRS DR1 catalogs, we detected no\nuncatalogued sources to our 10-sigma limit.\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir.\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",
  "circularId": 26754,
  "createdOn": 1579058246000,
  "email": "mpereyra@astro.unam.mx",
  "subject": "GRB 200114A: DDOTI/OAN optical observations report",
  "submitter": "Emma Margarita Pereyra Talamantes at IA-UNAM Ensenada  <mpereyra@astro.unam.mx>",
  "eventId": "GRB 200114A"
}