GCN Circular 14826
Subject
GRB 130606A: Continued Skynet/PROMPT observations
Date
2013-06-08T18:21:21Z (11 years ago)
From
Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet <atrotter@physics.unc.edu>
A. Trotter, A. LaCluyze, D. Reichart, J. Haislip, T. Berger, M. Carroll,
H. T. Cromartie, R. Egger, A. Foster, C. Foster, N. Frank, K. Ivarsen,
D. James, M. Maples, J. Moore, M. Nysewander, E. Speckhard, P. Taylor
and J. A. Crain report:
Skynet continued observing the field of GRB 130606A (Ukwatta et al., GCN
14781, Swift trigger #557589), using the optical localization of Xu et
al. (GCN 14783). It took 109 160-second exposures in the z' band with
one of the 16" telescopes of the PROMPT array at CTIO, Chile, with a
mean time t=1.3d post-trigger.
In a stack of all 109 exposures, we detect the afterglow at the 5-sigma
level, with z'~20.5 at t=1.3d. Together with the z' detections we
reported in Trotter et al. (GCN 14815), this implies an approximate
temporal index alpha~-1.2. A preliminary light curve of both nights'
data is at:
http://www.skynet.unc.edu/grb/grb130606a_2.png
Photometry is calibrated to 10 SDSS stars in the field; g' and z'
magnitudes are in the AB system; R-band magnitudes are in the Vega
system, with the SDSS calibration stars transformed according to Jester
(2005). No correction has been applied for the expected line-of-sight
Milky Way extinction of E(B-V)=0.02 (Schlegel et al. 1998).
No further Skynet observations are scheduled.
