[vsnet-grb-info 12800] GRB 130122A: RATIR Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14147
SUBJECT: GRB 130122A: RATIR Detection
DATE:    13/01/24 04:58:33 GMT
FROM:    Nat Butler at Az State U  <natbutler at 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&#8208;Ruiz (UCSC), Jos&#233; A. de
Diego (UNAM), Leonid Georgiev (UNAM), Jes&#250;s Gonz&#225;lez (UNAM),
Carlos Rom&#225;n-Z&#250;&#241;iga (UNAM), Neil Gehrels (GSFC), and Harvey
Moseley (GSFC) report:

Through intermittent clouds and in poor seeing conditions, we observed the
field of GRB 130122A (Lien, et al., GCN 14140) with the Reionization and
Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold
Johnson Telescope at the Observatorio Astron&#243;mico Nacional on Sierra
San Pedro M&#225;rtir.  Between 2013 Jan 23.30 to 2013 Jan 23.52 UTC (7.6
to 12.7 hours after the BAT trigger), we obtained approximately 45 minutes
of useful data in the r', i', Z, Y, and J bands.

In comparison with SDSS DR8 and 2MASS, we derive the following detection
and upper limits (3-sigma) in the AB magnitude system for a source
spatially coincident with the UVOT position (GCN 14140):

 r' >20.7
 i' 21.1 +/- 0.2
 Z  >20.3
 Y  >20.2
 J  >18.2

These magnitudes are not corrected for Galactic extinction in the direction
of the GRB.  Continued observations are planned.

We thank the staff of the Observatorio Astron&#243;mico Nacional in San
Pedro M&#225;rtir.