TITLE:   GCN CIRCULAR
NUMBER:  14616
SUBJECT: GRB 130508A: RATIR Optical and NIR Observations
DATE:    13/05/09 16:42:06 GMT
FROM:    Nat Butler at Az State U  <natbutler@asu.edu>

Nat Butler (ASU), Alan M. Watson (UNAM), 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),
Jos� A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes�s Gonz�lez (UNAM),
Carlos Rom�n-Z��iga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC)
report:

We observed the field of GRB 130508A (Holland, et al., GCN 14607) with the
Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the
1.5m Harold Johnson Telescope at the Observatorio Astron�mico Nacional on
Sierra San Pedro M�rtir from 2013/05 9.36 to 2013/05 9.45 UTC (15.45 to
17.54 hours after the BAT trigger), obtaining a total of 1.42 hours
exposure in the r' and i' bands and 0.60 hours exposure in the Z, Y, J, and
H bands.

For a source within the Swift-XRT error circle (Evans et al., GCN 14614),
in comparison with USNO-B1 and 2MASS, we obtain the following upper limits
(3-sigma):

  r' > 23.81
  i' > 23.53
  Z  > 21.95
  Y  > 21.66
  J  > 21.00
  H  > 20.42

These magnitudes are in the AB system and not corrected for Galactic
extinction in the direction of the GRB.

We thank the staff of the Observatorio Astron�mico Nacional in San Pedro
M�rtir.