GCN Circular 12544
Subject
Continued Skynet observations of GRB111107A
Event
Date
2011-11-07T22:21:48Z (15 years ago)
From
Aaron LaCluyze at U.North Carolina <lacluyze@email.unc.edu>
A. LaCluyze, J. Haislip, K. Ivarsen, D. Reichart, M. Nysewander, J. Moore,
A. Trotter, R. Egger, A. Foster, A. Oza, T. Cromartie, E. Speckhard, and J.
A. Crain report:
Skynet continued observing the field of GRB 111107A (Swift trigger 507185,
Siegel et al., GCN 12534; LaCluyze et al., GCN 12535; Kruehler et al., GCN
12536; Kuin et al., GCN 12540) with the PROMPT telescopes located at CTIO
in Chile in B, R, and I. We detect the fading optical counterpart in R and
I, with limits in B. The fading is consistent with a power-law index of
~-0.7.
Preliminary light curve can be found at the following link:
http://skynet.unc.edu/grb/grb111107a.png
Prompt4, R-band, calibrated to 12 USNO B1.0 stars
T(mean) Tmean(days) Exps Mag 1-sig MagErr
14.75 m 0.01024 5 x 80 s 19.467 +0.427/-0.311
30.93 m 0.02148 13 x 80 s 19.883 +0.360/-0.273
61.87 m 0.04296 24 x 80 s 20.319 +0.337/-0.259
118.57 m 0.08234 43 x 80 s 20.818 +0.404/-0.298
3.815 h 0.15895 94 x 80 s 21.206 +0.243/-0.200
6.619 h 0.27579 102 x 80 s 21.837 +0.357/-0.271
Prompt5, I-band, calibrated to 15 USNO B1.0 stars
T(mean) Tmean(days) Exps Mag 1-sig MagErr
15.22 m 0.01057 4 x 80 s 18.443 +0.274/-0.220
24.77 m 0.01720 5 x 80 s 18.520 +0.263/-0.212
49.60 m 0.03444 24 x 80 s 19.474 +0.262/-0.212
112.45 m 0.07809 49 x 80 s 19.898 +0.300/-0.237
3.139 h 0.13081 43 x 80 s 20.297 +0.390/-0.291
6.189 h 0.25788 130 x 80 s 20.650 +0.273/-0.220
Prompt3, B-band, calibrated to 14 USNO B1.0 stars
T(mean) Tmean(days) Exps 3-SigLimMag
88.62 m 0.06154 47 x 80 s 20.3
4.738 h 0.19743 159 x 80 s 21.6
Further observations are planned. This message may be cited.