GCN Circular 15235
Subject
GRB 130919A: Skynet PROMPT-CTIO optical upper limits
Date
2013-09-20T04:04:19Z (11 years ago)
From
Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet <atrotter@physics.unc.edu>
A. Trotter, D. Reichart, J. Haislip, A. LaCluyze, J. Moore, N. Frank, K.
Ivarsen, M. Nysewander, A. Foster, T. Berger, H. T. Cromartie, R. Egger,
M. Maples, and J. A. Crain report:
Skynet observed the Swift-BAT localization of GRB 130919A (Krimm et al.,
GCN 15232; Lien et al., GCN 15234, Swift trigger=571271) with three 16"
telescopes of the PROMPT array at CTIO, Chile (V, R, and I bands).
Starting at 2013-09-19, 23:29 UT and continuing until 2013-09-20, 00:00
UT (t=12.40-12.93h post-trigger), Skynet took a total of 49 160s
exposures, at high airmass >3. In stacked images, we do not detect any
uncatalogued optical source in any band in or near the Swift-BAT error
circles. The 3-sigma limiting magnitudes of our images are:
==================================
tmid scope expos fil limit
==================================
12.67h Prompt5 12x160s I >19.44
12.55h Prompt4 7x160s R >19.24
12.63m Prompt1 10x160s V >19.54
==================================
Magnitudes are in the Vega System, calibrated to 8 APASS-DR7 stars in
the field. Magnitudes have not been corrected for line-of-sight Milky
Way dust extinction, with expected E(B-V)=0.057 (Schlegel et al. 1998).
No further Skynet observations are scheduled.