{
  "version": 2,
  "editedOn": 1731006029538,
  "eventId": "GRB 150724B",
  "submitter": "Alan M. Watson at Instituto de Astronomia UNAM  <alan@astro.unam.mx>",
  "format": "text/plain",
  "circularId": 18072,
  "email": "alan@astro.unam.mx",
  "bibcode": "2015GCN.18072....1B",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>",
  "subject": "GRB 150724B: RATIR Optical Observations",
  "createdOn": 1437968030000,
  "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), \nJesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), \nand Harvey Moseley (GSFC) report:\n\nWe observed the field of the LAT GRB 150724B (Bissaldi et al., GCN 18065) \nwith 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 2015/07 26.28 to \n2015/07 26.48 UTC (36.02 to 40.86 hours after the BAT trigger), obtaining \na total of 2.39 hours exposure in the r and i bands.\n\nFor a source within the Swift XRT error circle (Osborne et al., GCN \n18069), in comparison with the SDSS DR9 catalog, we obtain the following \ndetections:\n\n   r 23.24 +/- 0.34\n   i 22.39 +/- 0.15\n\nThese magnitudes are in the AB system and are not corrected for Galactic \nextinction in the direction of the GRB.\n\nAt this moment we have no information on fading. Further observations are \nplanned.\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro \nMártir."
}