{
  "bibcode": "2020GCN.26792....1B",
  "body": "Rosa L. Becerra (UNAM), Margarita Pereyra (UNAM), Nat Butler (ASU), Alan M.\nWatson (UNAM),  Eleonora Troja (GSFC/UMD),  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 200115A detected by BAT/Swift (Cenko, GCN\nCirc. 26771), with the DDOTI/OAN wide-field imager at the Observatorio\nAstron��mico Nacional on Sierra San Pedro M��rtir (\nhttp://ddoti.astroscu.unam.mx) from 2020-01-16 02:01 to 2020-01-16 02:19\nUTC (14.2 to 14.48 hours after the event).\n\nWe observed a region of 6.8 degrees in RA by 10.2 degrees in declination\ncentered on the peak of the Swift-BAT on-board calculated location\n03:45:48.7 +05:36:26.0 J2000. This region contains about 70 square degrees.\nWe obtained about 16 minutes total exposure across the region.\n\nWe calibrated our images against the APASS catalog. Our 3-sigma limiting\nmagnitude is w = 19.80 for the enhanced Swift-BAT error region (Laha et\nal., GCN Circ. 26780). Comparing to the USNO-B1 and SDSS DR9 catalogs we do\nnot detect any uncataloged source  to our 3-sigma limit.\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir.\n\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": 26792,
  "createdOn": 1579208360000,
  "email": "mpereyra@astro.unam.mx",
  "subject": "GRB 200115A: DDOTI/OAN  optical observations report",
  "submitter": "Emma Margarita Pereyra Talamantes at IA-UNAM Ensenada  <mpereyra@astro.unam.mx>",
  "eventId": "GRB 200115A"
}