[vsnet-grb-info 8437] GRB 090926A: Skynet/PROMPT Continued Observations
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Mon Sep 28 03:49:10 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 9953
SUBJECT: GRB 090926A: Skynet/PROMPT Continued Observations
DATE: 09/09/27 18:49:04 GMT
FROM: Josh Haislip at U.North Carolina <haislip at physics.unc.edu>
J. Haislip, D. Reichart, K. Ivarsen, A. LaCluyze, A. Foster, J. Moore, A.
Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. Nysewander
report:
Skynet continued to observe the afterglow (Haislip et al., GCN 9937) of GRB
090926A (Bissaldi, GCN 9933) with four of the 16" PROMPT telescopes at CTIO
throughout the night in BVRI.
We find that the light curve brightens from the beginning of our
observations (about 19 hours after the trigger) to about 1 day after the
trigger in all bands, which is consistent with the findings of Oates &
Vetere (GCN 9948) in UVOT's u band.
Around 1 day, the light curve peaks at R = 17.8 mag (calibrated to 82 USNO
B1 stars) and begins to fade. A second, smaller rebrightening begins
around 26 hours and peaks at R = 18.0 mag around 27 hours.
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