[vsnet-grb-info 15922] GRB 141221A: Skynet PROMPT-CTIO observations of the optical afterglow
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Mon Dec 22 00:16:18 JST 2014
TITLE: GCN CIRCULAR
NUMBER: 17210
SUBJECT: GRB 141221A: Skynet PROMPT-CTIO observations of the optical afterglow
DATE: 14/12/21 15:16:10 GMT
FROM: Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet <atrotter at physics.unc.edu>
A. Trotter, J. Haislip, D. Reichart, A. Aji, R. Beauchemin, T. Berger,
A. Dow, A. Foster, N. Frank, M. Hinckle, K. Ivarsen, A. LaCluyze, M.
Maples, J. Moore, M. Nysewander, C. Salemi, L. Zbinden, and J. A. Crain
report:
Skynet observed the Swift BAT/XRT localization of GRB 141221A (Sonbas et
al., GCN 17206, Swift trigger=622006) with two 14" telescopes of the
PROMPT array at Cerro Tololo, Chile. Starting at 2014-12-21 08:07:56 UT
and continuing until 08:35 UT (t=45s-28m post-trigger), Skynet took a
total of 44 exposures ranging from 5s to 160s in the V and I bands. We
clearly detect the optical afterglow (Covino, GCN 17208, Guidorzi et
al., GCN 17209) with a rising light curve prior to t=2min, where it
peaks at I=14.8.
A preliminary light curve is at:
http://www.skynet.unc.edu/grb/grb141221a.png
Magnitudes are in the Vega System, calibrated to 3 APASS stars in the
field. Magnitudes have not been corrected for line-of-sight Milky Way
dust extinction, with expected E(B-V)=0.024 (Schlafly & Finkbeiner 2011).
Skynet observations will continue.
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