GCN Circular 10494
Subject
GRB 100316B: Skynet/PROMPT Observations of Fading
Date
2010-03-16T10:13:19Z (14 years ago)
From
Josh Haislip at U.North Carolina <haislip@physics.unc.edu>
J. Haislip, K. Ivarsen, D. Reichart, A. LaCluyze, R. Egger, A. Foster, J.
Moore, A. Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M.
Nysewander report:
Skynet observed the Swift/BAT localization of GRB 100316B (Baumgartner et
al., GCN 10489) with four of the 16" PROMPT telescopes at CTIO beginning 32
seconds after the trigger (19 seconds after notification) in BVRI.
We detect the afterglow (Baumgartner et al., GCN 10489) in all filters.
At 34 seconds after the trigger, the afterglow's magnitude was I = 15.61
+0.16 -0.14 (statistical) +/- 0.20 (systematic; calibrated to 56 USNO B1
stars).
Between 34 seconds and 2.1 minutes after the trigger, the afterglow faded
with a power-law index of about -1.0.
Between 2.1 and 35 minutes after the trigger, the afterglow faded more
slowly, with a power-law index of about -0.3.
Between 35 and 41 minutes after the trigger, the afterglow suddenly
rebrightened, with a power-law index of about +5.4.
Between 41 and 49 minutes after the trigger, the afterglow faded with a
power-law index of about -0.6.
Between 49 and 95 minutes after the trigger, the afterglow faded more
rapidly, with a power-law index of about -1.7.
At 95 minutes after the trigger, the afterglow's magnitude was R = 19.51
+0.33 -0.26 (statistical) +/- 0.28 (systematic; calibrated to 40 USNO B1
stars).
Skynet's most recent BVRI light curve, calibrated to USNO B1 and NOMAD
stars, can be found here:
http://skynet.unc.edu/grb/grb100316b.png
