[vsnet-grb-info 13312] GRB 130514A: Skynet/PROMPT/DSO Detections

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14648
SUBJECT: GRB 130514A: Skynet/PROMPT/DSO Detections
DATE:    13/05/15 00:28:06 GMT
FROM:    Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet  <atrotter at physics.unc.edu>

A. Trotter, D. Reichart, J. Haislip, A. LaCluyze, A. Smith, D. Caton, L. 
Hawkins, 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 observed the Swift/XRT localization of GRB 130515A (Sonbas et 
al., GCN 14632, Swift trigger #555821) with four 16" telescopes of the 
PROMPT array at CTIO, Chile and with the 14" telescope at the 
Appalachian State University Dark Sky Observatory (DSO) in Pisgah 
National Forest, North Carolina, starting at 2013-05-14, 07:14:32 UT, 
and continuing until 10:24 UT (t=51s-3.2h post-trigger). It took ~400 
exposures, ranging from 5s at early times to 160s at late times, 
simultaneously in each of the BVRI bands. We performed photometry on 
each exposure, calibrated to seven USNO-B1/NOMAD stars in the field.

We detect a fading afterglow at t=2-12m in the I band in unstacked 
images at the position reported by the GROND team (Schmidl, Kann & 
Greiner, GCN 14640), with I~17.4 at t=2m, fading with an approximate 
temporal index alpha~-1.2.  In stacked images, we obtain weak detections 
in R band at t=2.27m and 51m, and in V band at t=3.75m; both the R and 
the V band detections are ~1mag fainter than the I band light curve.  In 
B band, we obtain three weak detections from t=5m to 15m, all ~0.6mag 
fainter than the I band light curve.

A preliminary plot of our data is at:
http://skynet.unc.edu/grb/grb130514a.png

No further Skynet observations are scheduled.