[AAVSO-HEN] GRB 091127: Skynet/PROMPT Continued Observations of Fading

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  10230
SUBJECT: GRB 091127: Skynet/PROMPT Continued Observations of Fading
DATE:    09/12/02 17:34:10 GMT
FROM:    Josh Haislip at U.North Carolina  <haislip at physics.unc.edu>

J. Haislip, D. Reichart, K. Ivarsen, A. LaCluyze, R. Egger, 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 (Smith et al., GCN 10192) of GRB 
091127 (Troja et al., GCN 10191) with four of the 16" PROMPT telescopes at 
CTIO in BVRI.

The light curve (Haislip et al., GCN 10107) continued to roll over. Between 
25.0 hours and 3.4 days after the trigger, the afterglow faded with a 
power-law index of about -1.4 in all bands.

At 3.2 days after the trigger, the afterglow's magnitude was R = 20.71 
+0.15 -0.13 (statistical) +/-  0.37 (systematic; calibrated to 102 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/grb091127.png