GCN Circular 15148
Subject
GRB 130831A: Skynet/PROMPT-SSO detections
Date
2013-08-31T21:08:52Z (11 years ago)
From
Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet <atrotter@physics.unc.edu>
A. Trotter, J. Haislip, A. LaCluyze, J. Moore, N. Frank, D. Reichart, T.
Berger, H. T. Cromartie, R. Egger, A. Foster, K. Ivarsen, M. Maples, M.
Nysewander, and J. A. Crain report:
Skynet observed the Swift/BAT localization of GRB 130831A (Hagen et al.,
GCN 15139, Swift trigger #568849) with four 17" telescopes of the
newly-commissioned PROMPT array at Siding Spring Observatory, NSW,
Australia. Starting at 2013-08-31, 13:39 UT and continuing until 17:41
UT (t=35.5m-4.65h post-trigger), it took 615 80-s exposures in the BVRI
bands. We detect a bright fading afterglow in all four bands at RA
23:54:29.8, Dec 29:25:46.4 (J2000.0), within the error circle of the
Enhanced Swift-XRT localization (Evans et al., GCN 15147).
A preliminary light curve is at:
http://skynet.unc.edu/grb/grb130831a.png
Magnitudes are in the Vega system, calibrated to 6 APASS stars in the
field, and have not been corrected for the modest expected line-of-sight
Milky Way dust extinction E(B-V)=0.046 (Schlegel et al. 1998).
Skynet observations are ongoing.
