[vsnet-grb-info 15730] GRB 141031B: RATIR Optical and NIR Observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17018
SUBJECT: GRB 141031B: RATIR Optical and NIR Observation
DATE:    14/11/01 16:05:34 GMT
FROM:    Nat Butler at UC berkeley  <natxbutler at gmail.com>

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 141031B (Gompertz, et al., GCN 16998) 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 2014/11 1.10 to 2014/11 1.11 UTC (11.34 to
11.75 hours after the BAT trigger), obtaining a total of 0.36 hours
exposure in the r, i, and z bands.

For a source within the enhanced Swift-XRT error circle (Goad, et al., GCN
17009), in comparison with the SDSS DR9, we obtain the following upper
limits (3-sigma):

  r > 22.98
  i > 22.81
  z > 19.91

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

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