[vsnet-grb-info 13173] GRB 130427A: Continued Skynet/PROMPT Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14510
SUBJECT: GRB 130427A: Continued Skynet/PROMPT Observations
DATE:    13/04/30 01:26:11 GMT
FROM:    Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet  <atrotter at physics.unc.edu>

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

Skynet continued observing the Swift/XRT localization of GRB 130427A 
(Maselli et al., GCN 14448, Swift trigger #554620) with four 16" 
telescopes of the PROMPT array at CTIO, Chile, starting at 2013-04-28, 
23:06 UT, and continuing until 04-29, 3:51 UT (t=39.28h-44.03h 
post-trigger). It took ~110 160-s exposures, simultaneously in each of 
the BVRI bands. We performed photometry on each exposure, calibrated to 
two SDSS stars in the field. B-band photometry was performed on stacks 
of 3-4 images in order to provide at least 3sigma detections.

A preliminary light curve of the second's data is at:
http://skynet.unc.edu/grb/grb130427a_2.png

A light curve of both the first and second nights' data is at:
http://skynet.unc.edu/grb/grb130427a_1_2.png

See Trotter et al. (GCN 14497) for a description of the first night's 
observations.  Further Skynet observations are ongoing.