TITLE:   GCN CIRCULAR
NUMBER:  14836
SUBJECT: GRB 130608A: RATIR Optical and NIR Observations
DATE:    13/06/09 16:26:17 GMT
FROM:    Alan M. Watson at Instituto de Astronomia UNAM  <alan@astro.unam.mx>

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 130608A (Krimm, et al., GCN 14827) 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 in morning twilight from 2013/06
9.46 to 2013/06 9.47 UTC (11.70 to 12.00 hours after the BAT trigger),
obtaining a total of 0.20 hours exposure in the r' and i' bands and 0.08
hours exposure in the Z, Y, J, and H bands.

For a source within the Swift-XRT error circle (Beardmore, et al., GCN
14832), in comparison with the RATIR zero points and 2MASS, we obtain
the following upper limits (3-sigma):

 r'    > 21.90
 i'    > 22.27
 Z     > 21.21
 Y     > 20.64
 J     > 20.12
 H     > 19.80

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 Astronómico Nacional in San Pedro
Mártir.