Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 14778

GRB 130605A: Continued Skynet/PROMPT observations
2013-06-06T03:45:50Z (11 years ago)
Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet <>
A. Trotter, A. Lacluyze, D. Reichart, J. Haislip, 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/BAT localization of GRB 130605A (Holland et 
al., GCN 14773, Swift trigger #557508) with three 16" telescopes of the 
PROMPT array at CTIO, Chile,  starting at 2013-06-05, 23:43:23 UT 
(t=101s post-trigger), and continuing until t=3h. Exposure lengths range 
from 10s at early times to 160s at later times.  Multiple 160s exposures 
were stacked at later times to increase sensitivity.

We detect a fading afterglow in B, V and I bands at the position 
reported by Nicuesa Guelbenzu et al. (GCN 14774), at:
RA   08:50:08.6
Dec -33:27:40.3

 From t=1.7m to t=9m, the afterglow fades with an approximate temporal 
index alpha~-0.7, after which it steepens to alpha~-1.4.  A preliminary 
light curve is at:

Magnitudes are in the Vega system, calibrated to 3 APASS stars in the 
field, and are not corrected for the expected Milky Way extinction of 
E(B-V)=1.12 (Schlegel et al. 1998), which, assuming R_V=3.1, corresponds to:
band      B       V       I
A_lambda  1.57    1.17    0.71

No further Skynet observations are scheduled.
Looking for U.S. government information and services? Visit