{
  "submitter": "Alan M. Watson at Instituto de Astronomia UNAM  <alan@astro.unam.mx>",
  "circularId": 17128,
  "eventId": "GRB 141121A",
  "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>",
  "subject": "GRB 141121A: Continued RATIR Optical Observations",
  "email": "alan@astro.unam.mx",
  "version": 2,
  "bibcode": "2014GCN.17128....1W",
  "editedOn": 1731008131272,
  "format": "text/plain",
  "body": "Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H.\nLee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J.\nXavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC),\nEleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), José\nA. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos\nRomán-Zúñiga (UNAM), Neil Gehrels (GSFC), and 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 1.5m\nHarold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San\nPedro Mártir from 2014/12 1.30 to 2014/12 1.54 UTC (243.35 to 249.19 hours after\nthe BAT trigger), obtaining a total of 4.56 hours exposure in the r, i, and z\nbands.\n\nFor a source within the Swift-XRT error circle, in comparison with the SDSS, we\nobtain the following detections and upper limits (3-sigma):\n\nr = 22.38 +/- 0.16\ni = 22.21 +/- 0.16\nz > 20.41\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.\n\nCompared to our observations on previous nights (Watson et al., GCN 17116;\nButler et al., GCN 17119), the fading appears to be slowing and is now behaving\nas t^-0.5. This may be evidence for an underlying host galaxy more closely\ncoincident with the GRB than the candidate reported by Watson et al. (GCN\n17105).\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.",
  "createdOn": 1417450028000
}