TITLE:   GCN CIRCULAR
NUMBER:  14943
SUBJECT: GRB 130626A: RATIR Optical Observations
DATE:    13/06/27 21:36:50 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),
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 the short-duration GRB 130626A (De Pasquale, et
al., GCN 14931) 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 beginning 200
seconds after the BAT trigger, obtaining simultaneous 80 second exposures
in the r' and i' bands.

We note that there is DSS source at the center of the corrected candidate
Swift-XRT error circle (Page, et al., GCN 14937).  In comparison with 2MASS
and the RATIR zero points, we measure for this source:

  r'    18.69 +/- 0.07
  i'    17.40 +/- 0.05

No uncatalogued sources are detected within the XRT error circle.   We
derive the following 3-sigma limits:

  r' > 20.8
  i' > 20.5

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.