TITLE:   GCN CIRCULAR
NUMBER:  14267
SUBJECT: GRB 130305A: RATIR Observations
DATE:    13/03/07 01:47:52 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), 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 130305A (Cummings, et al., GCN 14257) 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 2013/03 6.12 to 2013/03 6.13 UTC (15.11 to
15.50 hours after the BAT trigger), obtaining a total of 0.31 hours
exposure in the r' and i' bands.

For a source within the Swift-XRT error circle (Malesani, et al., GCN
14263), in comparison with USNO-B1, we derive the following upper limits
(3-sigma) in the AB magnitude system:

  r'  > 23.4
  i'  > 23.1

These magnitudes are 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.