[vsnet-grb-info 14942] GRB 140508A: RATIR Optical and NIR Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16236
SUBJECT: GRB 140508A: RATIR Optical and NIR Observations
DATE:    14/05/09 14:34:57 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 GRB 140508A (Yu, et al., GCN 16224) 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 2014/05 9.19 to 2014/05 9.46 UTC (25.61 to
32.04 hours after the BAT trigger), obtaining a total of 4.27 hours
exposure in the r and i bands and 1.79 hours exposure in the Z, Y, J, and H
bands.

For a source positionally coincident with the iPTF optical transient
(Singer, et al. , GCN 16226), in comparison with the SDSS DR9 and 2MASS, we
obtain the following detections:

  r     19.65 +/- 0.02
  i     19.52 +/- 0.02
  Z     19.36 +/- 0.03
  Y     19.20 +/- 0.03
  J     19.18 +/- 0.03
  H     18.98 +/- 0.03

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.  The source fades in time
approximately as t^(-1.5) in all bands during our observation.

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