TITLE:   GCN CIRCULAR
NUMBER:  15762
SUBJECT: GRB 140129A: RATIR Optical and NIR Observations
DATE:    14/01/29 04:49:03 GMT
FROM:    Antonino Cucchiara at NASA/GSFC  <antonino.cucchiara@nasa.gov>

A. Cucchiara (NASA-GSFC), 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), 
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 began observing the field of GRB 140129A (Melandri, et al., GCN 15760) 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 at 2014/01 29.15 (12.6 minutes after the BAT trigger).

For a source within the Swift-XRT error circle, in comparison with the SDSS 
DR9 and 2MASS, we obtain the following detections:

Filter    mag(T0+0.12.6 minutes)	mag(12.6 to 44.4 minutes)     
  r	  18.05 +/- 0.01		18.80 +/- 0.01
  i	  17.85 +/- 0.02		18.67 +/- 0.02
  Z	  17.72 +/- 0.03		18.50 +/- 0.03
  Y	  17.82 +/- 0.04		18.33 +/- 0.03
  J	  17.65 +/- 0.05		18.35 +/- 0.04
  H	  17.68 +/- 0.07		18.19 +/- 0.05

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

We thank the staff of the Observatorio Astronómico Nacional in San Pedro 
Mártir.