[vsnet-grb-info 11457] GRB 120119A: PROMPT optical observation of early afterglow

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12864
SUBJECT: GRB 120119A: PROMPT optical observation of early afterglow
DATE:    12/01/19 05:29:06 GMT
FROM:    Aaron LaCluyze at U.North Carolina  <lacluyze at email.unc.edu>

A. LaCluyze, J. Haislip, K. Ivarsen, D. Reichart, J. Moore, M. Nysewander, 
A. Trotter, R. Egger, A. Foster, A. Oza, T. Cromartie, E. Speckhard, and J. 
A. Crain report:

Skynet observed the field of GRB 120119A with the PROMPT telescopes located 
at CTIO in Chile. Observations in B, R, and I began at 04:05:08 UT, 38 
seconds after the burst. We detect an optical source consistent with the 
UVOT position reported by Beardmore et. al. (GCN 12859) in all three 
filters.  The optical afterglow faded for the first ~2.3 minutes, then 
brightened until approximately minute 14, after which it resumed fading. 
The afterglow is red, with (I - R) ~ 1 mag and (R - B) ~ 2 mag.  

A preliminary light curve can be found at:
http://skynet.unc.edu/grb/grb120119a.png

Further observations are ongoing.