TITLE:   GCN CIRCULAR
NUMBER:  16568
SUBJECT: GRB 140710A: RATIR Optical and NIR Observations
DATE:    14/07/10 14:37:42 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
(ORAU/GSFC), 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 140710A (Siegel, et al., GCN 16563) 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 from 2014/07 10.43 to 2014/07 10.47 UTC (3.6
minutes to 1.12 hours after the BAT trigger), obtaining a total of 0.71
hours exposure in the r and i bands and 0.30 hours exposure in the Z, Y, J,
and H bands.

For a source within the Swift-XRT error circle (see also, Castro-Tirado, et
al., GCN 16564; Tanga, et al., GCN 16565), in comparison with 2MASS, we
obtain the following detections:

  r     21.36 +/- 0.08
  i     21.10 +/- 0.07
  Z     20.77 +/- 0.14
  Y     20.42 +/- 0.16
  J     20.31 +/- 0.14
  H     19.75 +/- 0.13

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.  The source appears to fade in all
bands.

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