{
  "submitter": "Nat Butler at Az State U  <natbutler@asu.edu>",
  "bibcode": "2015GCN.17762....1B",
  "subject": "GRB 150424A: RATIR Observations",
  "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>",
  "createdOn": 1429982767000,
  "version": 2,
  "eventId": "GRB 150424A",
  "editedOn": 1731009029709,
  "body": "Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William\nH. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB),\nJ. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara\n(ORAU/GSFC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico\nRamirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús\nGonzález (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and\nHarvey Moseley (GSFC) report:\n\nWe observed the field of the short-duration GRB 150424A (Beardmore, et al.,\nGCN 17743) with the Reionization and Transients Infrared Camera (RATIR;\nwww.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio\nAstronómico Nacional on Sierra San Pedro Mártir from 2015/04 25.14 to 2015/04\n25.28 UTC (19.54 to 23.05 hours after the BAT trigger), obtaining a total\nof 2.4 hours exposure in the r, i, and z bands.\n\nThe optical afterglow (Perley, GCN 17745; Marshall & Beardmore, GCN 17751;\nMalesani, et al., GCN 17756; Kann, et al., GCN 17757) is well-detected.  In\ncomparison with 2MASS and the USNO-B1 catalog, we obtain the following\ndetections and upper limit (3-sigma):\n\n  r     21.92 +/- 0.11\n  i     21.65 +/- 0.09\n  z     > 20.17\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.  Compared to the earlier NOT and\nGROND observations, the source appears to be continuing its strong fade\n(Kann, et al. GCN 17757).\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro\nMártir.",
  "circularId": 17762,
  "email": "natbutler@asu.edu",
  "format": "text/plain"
}