{
  "circularId": 17090,
  "email": "alan@astro.unam.mx",
  "eventId": "GRB 141121A",
  "createdOn": 1416759616000,
  "subject": "GRB 141121A: Continued RATIR Optical Observations - Rebrightening",
  "body": "Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC),\nWilliam H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB),\nOri Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino\nCucchiara (ORAU/GSFC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico\nRamirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM),\nJesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC),\nand Harvey Moseley (GSFC) report:\n\nWe observed the field of GRB 141121A (Lien et al., GCN 17075) with the\nReionization and Transients Infrared Camera (RATIR; www.ratir.org) on the\n1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on\nSierra San Pedro Mártir from 2014/11 23.31 to 2014/11 23.54 UTC (51.53\nto 57.18 hours after the BAT trigger), obtaining a total of 3.80 hours\nexposure in the r, i and z bands.\n\nFor a source within the Swift-XRT error circle, in comparison with the\nSDSS DR9, we obtain the following detections:\n\n r = 20.60 +/- 0.03\n i = 20.44 +/- 0.03\n z = 20.06 +/- 0.29\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.\n\nThe afterglow appears to have rebrightened by about 0.24 magnitudes in\nr and i compared to our observations at 30 hours (Butler et al., GCN\n17087).\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro\nMártir.",
  "editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>",
  "editedOn": 1731009600974,
  "version": 2,
  "bibcode": "2014GCN.17090....1W",
  "submitter": "Alan M. Watson at Instituto de Astronomia UNAM  <alan@astro.unam.mx>",
  "format": "text/plain"
}