{
  "bibcode": "2018GCN.22855....1T",
  "body": "Eleonora Troja (GSFC), Nat Butler (ASU), Alan M. Watson (UNAM),\nAlexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM),\nOri Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB),\nAntonino Cucchiara (UVI), Owen Littlejohns (ASU), Enrico\nRamirez-Ruiz (UCSC), Jesus Gonzalez (UNAM), Carlos Roman-Zuniga (UNAM),\nHarvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.),\nand Vicki Toy (UMD) report:\n\nWe observed the field of GRB 180626A (Evans, et al., GCN 22850) with the\nReionization and Transients Infrared Camera (RATIR; www.ratir.org) on the\n1.5m Harold Johnson Telescope at the Observatorio Astronomico Nacional on\nSierra San Pedro Martir from 2018/06 26.42 to 2018/06 26.43 UTC (1.61\nto 2.06 hours after the BAT trigger), obtaining a total of 0.36 hours\nexposure in the r and i bands.\n\nFor a source at the position of the UVOT counterpart, in comparison\nwith the SDSS DR9 catalog, we obtain the following detections:\n\n �� r������ = 21.57 +/- 0.22\n �� i������ = 20.91 +/- 0.13\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB. These magnitudes are fainter\nthan the values reported by Martone et al. (GCN 22854) suggesting that\nthe source is indeed the fading GRB afterglow.\n\nWe thank the staff of the Observatorio Astronomico Nacional in San Pedro\nMartir.",
  "circularId": 22855,
  "createdOn": 1530016572000,
  "email": "eleonora.troja@nasa.gov",
  "subject": "GRB 180626A: RATIR Optical Detection",
  "submitter": "Eleonora Troja at GSFC  <eleonora.troja@nasa.gov>",
  "eventId": "GRB 180626A"
}