GCN Circular 16962
Subject
GRB 141026A: Continued RATIR Optical and NIR Observations, Afterglow Detection
Date
2014-10-26T18:50:06Z (10 years ago)
From
Nat Butler at UC berkeley <natxbutler@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
(ORAU/GSFC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico
Ramirez-Ruiz (UCSC), Jos�� A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes��s
Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Neil Gehrels (GSFC), and
Harvey Moseley (GSFC) report:
We observed the field of GRB 141026A (Hagen, et al., GCN 16950)) with the
Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the
1.5m Harold Johnson Telescope at the Observatorio Astron��mico Nacional on
Sierra San Pedro M��rtir from 2014/10 26.13 to 2014/10 26.26 UTC (0.54 to
3.58 hours after the BAT trigger), obtaining a total of 2.49 hours exposure
in the r, i, and z bands.
With increased time-coverage, the source reported in Littlejohns et al.
(GCN 16952; also Perley et al., GCN 16955, Varela et al., GCN 16953,
Gorosabel et al., GCN 16954, ) appears to peak on a timescale of 1 hour,
and then fade in the r and i bands. Given also that its position is
consistent with the enhanched XRT error region (Beardmore et al., GCN
16956), this source is likely to be the afterglow to GRB 141026A. In
comparison with 2MASS, we obtain the following detections and upper limit
(3-sigma):
r 21.74 +/- 0.07
i 21.54 +/- 0.06
z > 20.5
These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB. Further observations are planned.
We thank the staff of the Observatorio Astron��mico Nacional in San Pedro
M��rtir.