[vsnet-grb-info 13491] GRB 130606A: Continued RATIR Optical and NIR Monitoring

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14824
SUBJECT: GRB 130606A: Continued RATIR Optical and NIR Monitoring
DATE:    13/06/08 13:54:51 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 (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 130606A (Ukwatta, et al., GCN 14781) 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 2013/06 8.18 to 2013/06 8.46 UTC (31.14 to
37.86 hours after the BAT trigger), obtaining a total of 4.96 hours
exposure in the r' and i' bands and 2.07 hours exposure in the Z, Y, J, and
H bands.

The optical/NIR afterglow (Jelinek, et al., GCN 14782; Xu et al., GCN
14783) is well detected.   In comparison with SDSS DR9 and 2MASS, we obtain
the following detections and 3-sigma upper limit:

 r'  >24.06
 i'  24.06 +/- 0.27
 Z   21.50 +/- 0.09
 Y   21.41 +/- 0.12
 J   21.16 +/- 0.12
 H   20.78 +/- 0.12

These magnitudes are in the AB system and not corrected for Galactic
extinction in the direction of the GRB.  In comparison to our observations
on the previous night (2013/06/07; Butler, et al., GCN 14799), the
afterglow has faded by about 3 magnitudes in all bands.

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