[vsnet-grb-info 14541] GRB 140215A: Continued RATIR Optical and NIR Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15855
SUBJECT: GRB 140215A: Continued RATIR Optical and NIR Observations
DATE:    14/02/17 17:12:25 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 again observed the field of GRB 140215A (Markwardt,, et al., GCN 15837)
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 2014/02 17.11 to 2014/02 17.20 UTC
(46.46 to 48.60 hours after the BAT trigger), obtaining a total of 1.41
hours exposure in the r and i bands and 0.58 hours exposure in the Z, Y, J,
and H bands.

For a source within the Swift-UVOT error circle, in comparison with 2MASS,
we obtain the following detections and upper limits (3-sigma):

  r     22.19 +/- 0.24
  i     21.65 +/- 0.16
  Z     > 21.45
  Y     > 20.71
  J     > 20.61
  H     > 20.12

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.  Compared to our observations last
night (Littlejohns et al., GCN 15849), the source flux is consistent with a
continued fading as t^-1.


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