GCN Circular 18028
Subject
GRB 150716A: RATIR Optical Observations
Date
2015-07-16T17:23:37Z (9 years ago)
Edited On
2024-11-07T19:43:25Z (2 months ago)
From
Alan M. Watson at Instituto de Astronomia UNAM <alan@astro.unam.mx>
Edited By
Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>
Alan M. Watson (UNAM), Nat Butler (ASU), 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 observed the field of GRB 150716A (Kocevski et al., GCN 18027) 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 2015/07 16.30 to 2015/07 16.45 UTC (0.06 to
3.61 hours after the BAT trigger), obtaining a total of 2.21 hours
exposure in the r and i bands.
The field is crowded. Nevertheless, we detect a candidate optical
afterglow within but close to the edge of the unenhanced Swift-XRT error
circle at 18:33:57.20 -12:58:40.1 (J2000, �0.5"). In comparison with the
USNO-B1 and 2MASS catalogs, we obtain the following detections:
r 20.34 ± 0.02
i 19.23 ± 0.02
At the moment, we have no information on fading, but further observations
are
planned.
These magnitudes are in the AB system and 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.