{
  "bibcode": "2017GCN.20681....1T",
  "body": "Eleonora Troja (GSFC), Nat Butler (ASU), Alan M. Watson (UNAM),\nAlexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer\n(UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB),\nAntonino Cucchiara (UVI), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz\n(UCSC), Jes��s Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Harvey\nMoseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and\nVicki Toy (UMD) report:\n\n\nWe observed the field of GRB 170214A (Mailyan, et al., GCN 20675;\nRacusin, et al., GCN 20676) with the Reionization and Transients\nInfrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson\nTelescope at the Observatorio Astron��mico Nacional on Sierra San Pedro\nM��rtir from 2017/02 15.44 to 2017/02 15.50 UTC (10.58 to 11.99 hours\nafter the GBM trigger). We performed a series of tiled observations\npartially covering the LAT error circle, obtaining a total of 0.40\nhours exposure in the r and i bands and 0.32 hours exposure in the Z\nand Y bands.\n\nAt the position of the first Swift/XRT source (source 1; Beardmore,\net al., GCN 20679), in comparison with the SDSS DR9 and 2MASS catalogs,\nwe obtain the following detections:\n\n   r    21.06 +/- 0.11\n   i    20.89 +/- 0.13\n   Z    20.54 +/- 0.18\n   Y    20.34 +/- 0.32\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.\n\nWe did not detect any significant fading during our observations, so\nat present we cannot confirm the nature of this source. Further\nobservations are planned.\n\nThe second, fainter XRT source (source 3; Beardmore, et al., GCN 20679)\nfalls outside our set of frames.\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir.",
  "circularId": 20681,
  "createdOn": 1487195955000,
  "email": "eleonora.troja@nasa.gov",
  "subject": "GRB170214A: RATIR Optical and NIR Observations",
  "submitter": "Eleonora Troja at GSFC  <eleonora.troja@nasa.gov>",
  "eventId": "GRB 170214A"
}