[vsnet-grb-info 16720] GRB 150710A: RATIR Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18001
SUBJECT: GRB 150710A: RATIR Observations
DATE:    15/07/10 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
(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 possible GRB 150710A (trigger 648437; Bernardini,
et al., GCN 18000) 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 2015/07
10.16 to 2015/07 10.20 UTC (3.47 to 4.31 hours after the BAT trigger),
obtaining a total of 0.71 hours exposure in the r, i, and z bands.

For a source within the Swift-XRT error circle, in comparison with the SDSS
DR9 catalog, we obtain the following upper limits (3-sigma):

  r > 23.4
  i > 23.2
  z > 19.4

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

We thank the staff of the Observatorio Astronómico Nacional in San Pedro
Mártir.  Further observations are ongoing.