{
  "bibcode": "2019GCN.23749....1W",
  "body": "Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), Diego\nGonz��lez (UNAM), William H. Lee (UNAM), Margarita Pereyra (UNAM), Carlos\nRom��n-Z����iga (UNAM), Alexander Kutyrev (GSFC), and Eleonora Troja\n(GSFC) report:\n\nWe observed the field of GRB 190114C (Gropp et al., GCN Circ. 23688)\nwith the COATLI 50-cm telescope and interim imager at the Observatorio\nAstron��mico Nacional on the Sierra de San Pedro M��rtir\n(http://coatli.astroscu.unam.mx) from 2019-01-17 02:25 to 2019-01-17\n07:56 (from 53.7 to 59.2 hours after the trigger), obtaining a total of\n2.93 hours of exposure in the w filter.\n\nWe detect a source coincident with the enhanced XRT position (Osborne et\nal., GCN Circ. 23704) and possible host galaxy (de Ugarte Postigo et\nal., GCN Circ. 23692) with w = 20.32 +/- 0.07.\n\nOur w magnitudes are calibrated against the USNO-B1 catalog (adjusted to\nan approximate AB system) and are not corrected for Galactic extinction\nin the direction of the GRB.\n\nWe thank the COATLI technical team (Fernando ��ngeles, Oscar Chapa,\nSalvador Cuevas, Alejandro Farah, Jorge Fuentes, Rosal��a Langarica,\nFernando Quir��s, and Carlos Tejada) and the staff of the Observatorio\nAstron��mico Nacional.",
  "circularId": 23749,
  "createdOn": 1547747623000,
  "email": "alan@astro.unam.mx",
  "subject": "GRB 190114C: COATLI Optical Detection",
  "submitter": "Alan M. Watson at Instituto de Astronomia UNAM  <alan@astro.unam.mx>",
  "eventId": "GRB 190114C"
}