TITLE: GCN CIRCULAR NUMBER: 14643 SUBJECT: GRB 130514A: RATIR Optical and NIR Observations DATE: 13/05/14 18:13:06 GMT FROM: Alan M. Watson at Instituto de Astronomia UNAM Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB) J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UCSC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 130514A (Sonbas et al., GCN 14632) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2013/05 14.30 to 2013/05 14.46 UTC (4.7 minutes to 3.90 hours after the BAT trigger), obtaining a total of 2.49 hours exposure in the r' and i' bands and 1.04 hours exposure in the Z, Y, J, and H bands. For a source within the Swift-XRT error circle, in comparison with USNO-B1 and 2MASS, we obtain the following upper limits (3-sigma): r' > 23.51 i' > 23.39 Z > 22.07 Y > 21.62 J > 21.43 H > 21.13 These magnitudes are in the AB system and not corrected for Galactic extinction in the direction of the GRB. Schmidl et al. (GCN Circular 14634) report a source with r = 20.0 and i = 19.2 in images taken from 2 to 6 minutes after the BAT trigger. Perley (GCN Circular 14633) reports a marginal detection in r and z in images taken from 12 to 27 minutes after the BAT trigger. We began exposing on this field less than 5 minutes after the BAT trigger, but due to the high airmass of almost 5 and poor transparency on the south-eastern horizon, our first useful images are not until about 17 minutes after the trigger. The evolution of our 3-sigma limits is: i' > 21.72 at 0.49 hours after the trigger i' > 22.48 at 1.14 hours i' > 23.00 at 1.59 hours i' > 23.17 at 2.02 hours i' > 23.24 at 2.60 hours i' > 23.30 at 3.34 hours i' > 23.39 at 3.90 hours If we extrapolate the Schmidl et al. measurement of i = 19.2 at 4 minutes according to t^-1, we would expect to have detected their source in our observations out to 2 hours. That we did not suggests that light curve fell faster than this. We note that quick-look light curve for Swift-XRT falls by almost three orders of magnitude between about 3 minutes and 20 minutes, which may be consistent with a rapid optical decay. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir. [GCN OPS NOTE(14may13): Per author's request,"Kann et al" was changed to "Schmidl et al", and the "approx equal" ISO-char symbols were replaced with simple equal signs (=).]