[vsnet-grb-info 12832] GRB 130131B: RATIR Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14179
SUBJECT: GRB 130131B: RATIR Upper Limits
DATE:    13/02/02 14:51:20 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), Enrico Ramirez‐Ruiz (UCSC), Jos&eacute; A. de Diego
(UNAM), Leonid Georgiev (UNAM), Jes&uacute;s Gonz&aacute;lez (UNAM), Carlos
Rom&aacute;n-Z&uacute;&ntilde;iga (UNAM), Neil Gehrels (GSFC), and Harvey
Moseley (GSFC) report:

We observed the field of GRB 130131B (Siegel et al., GCN 14159) with the
Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the
1.5m Harold Johnson Telescope at the Observatorio Astron&oacute;mico
Nacional on Sierra San Pedro M&aacute;rtir. Between 2013 February 1.42 and
2013 February 1.54 UTC (14.86 to 17.70 hrs after the BAT trigger), we
obtained 1.96 hrs exposure in the r and i bands and 0.73 hrs exposure in
the Z, Y, J, and H bands.

We detect no source within the XRT error circle (Goad et al., GCN 14165).
In comparison with SDSS DR8 and 2MASS, we derive the following upper limits
(3-sigma) in the AB magnitude system:

 r' > 23.8
 i' > 23.1
Z > 22.1
Y > 21.7
J  > 21.8
H > 21.4

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

We thank the staff of the Observatorio Astron&oacute;mico Nacional in San
Pedro M&aacute;rtir.