[vsnet-grb-info 14807] GRB 140419A: RATIR Optical and NIR Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16121
SUBJECT: GRB 140419A: RATIR Optical and NIR Observations
DATE:    14/04/19 05:30:28 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 140419A (Marshall, et al., GCN 16118) 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 2014/04 19.18 to 2014/04 19.20 UTC (9 to 40
minutes after the BAT trigger), obtaining a total of 0.36 hours exposure in
the r and i bands and 0.15 hours exposure in the Z, Y, J, and H bands.

We detect the UVOT optical transient (see also, Zheng, et al., GCN 16116;
Guver et al., GCN 16120).  In comparison with the SDSS DR9 and 2MASS, we
obtain the following detections:

  r     16.22 +/- 0.01
  i     15.81 +/- 0.01
  Z     15.66 +/- 0.01
  Y     15.46 +/- 0.02
  J     15.31 +/- 0.01
  H     15.26 +/- 0.02

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.  The source appears to be fading
approximately as t^(-1) in all of our bands during the observation.

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