{
  "bibcode": "2019GCN.24946....1B",
  "body": "Rosa L. Becerra (UNAM), Alan M. Watson (UNAM),  Nat Butler (ASU),\nDiego Gonz��lez (UNAM),Alexander Kutyrev (GSFC), William H. Lee (UNAM),\nMargarita Pereyra (UNAM), and Eleonora Troja (GSFC) report:\n\nWe observed the field of GRB 190701A (Ukwatta et al., GCN Circ.\n24934) with the COATLI 50-cm telescope and interim imager at the\nObservatorio Astron��mico Nacional on the Sierra de San Pedro M��rtir\n(http://coatli.astroscu.unam.mx) from 2019-07-01 09:47:03 to 10:05:06\n(from 25.6 seconds after the alert or 103 seconds to 0.33 hours after\nthe trigger), obtaining a total of 490 seconds of exposure in the w filter.\n\nComparing to the USNO and Pan-STARRS1 catalogs, we do not detect any new\nsources brighter than w = 20.99 (3-sigma limiting mag) in the XRT error\nregion\n(Osborne et al., GCN Circ. 24940).\n\nOur w magnitudes are calibrated against the Pan-STARRS1 catalog, are on\nan approximate AB system, and are not corrected for Galactic extinction\nin the direction of the GRB.\n\nWe thank the COATLI technical team and the staff of the Observatorio\nAstron��mico Nacional.",
  "circularId": 24946,
  "createdOn": 1562010719000,
  "email": "rbecerra@astro.unam.mx",
  "subject": "GRB 190701A: COATLI Optical Observations",
  "submitter": "Rosa Leticia Becerra Godinez at Inst. de Astronoma,UNAM  <rbecerra@astro.unam.mx>",
  "eventId": "GRB 190701A"
}