TITLE:   GCN CIRCULAR
NUMBER:  14877
SUBJECT: GRB 130612A: Skynet/PROMPT detection of the optical afterglow
DATE:    13/06/12 04:36:09 GMT
FROM:    Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet  <atrotter@physics.unc.edu>

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

Skynet observed the Swift XRT localization of the field of GRB 130612A 
(Racusin et al., GCN 14874, Swift trigger #557976), beginning at 
2013-06-12, 3:23:27 UT (t=70s post-trigger) using three 16" telescopes 
of the PROMPT array at Cerro Tololo, Chile.  We detect a fading 
afterglow in the B, V and I bands at a position (J2000.0)
RA: 17:19:10.6
Dec: 16:43:11.6,
consistent with the detections of Racusin et al. (GCN 14874), Melandri, 
Mundell & Gomboc (GCN 14875), and Morgan (GCN 14876).

A preliminary light curve is at:
http://www.skynet.unc.edu/grb/grb130612a.png

Preliminary photometry is calibrated to 5 NOMAD/USNO B1.0 stars in the 
field, and magnitudes are in the Vega system.

Skynet observations are ongoing.

[GCN OPS NOTE(12jun13): Per author's request, the typo in JH's name was corrected.]