[vsnet-grb-info 13095] GRB 130420B: RATIR Optical and NIR Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14432
SUBJECT: GRB 130420B: RATIR Optical and NIR Observations
DATE:    13/04/21 17:24:52 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 (UCSC),
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 130420B (Oates et al., GCN 14411) 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 2013/04 21.15 to 2013/04 21.29 UTC (14.54 to
18.10 hours after the BAT trigger), obtaining a total of 1.32 hours
exposure in the r' and i' bands and 0.55 hours exposure in the Z, Y, J, and
H bands.

For a source within the Swift-XRT error circle (Page et al., GCN 14430), in
comparison with SDSS DR8 and 2MASS, we obtain the following upper limits
(3-sigma) in the AB magnitude system:

 r'> 23.19
 i'> 22.99
 Z > 21.87
 Y > 21.39
 J > 21.20
 H > 20.53

These magnitudes 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.