GCN Circular 10002
Subject
GRB 090518: Skynet/PROMPT Observations
Date
2009-10-09T03:19:09Z (15 years ago)
From
Josh Haislip at U.North Carolina <haislip@physics.unc.edu>
J. Haislip, D. Reichart, K. Ivarsen, A. LaCluyze, A. Foster, J. Moore, A.
Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. Nysewander
report:
Skynet observed the Swift/BAT localization of GRB 090518 (Evans et al., GCN
9386) with four of the 16" PROMPT telescopes at CTIO beginning 3.3 minutes
after the trigger in UVRI.
We do not detect the afterglow (Evans et al., GCN 9386) within the enhanced
Swift/XRT localization (Evans et al., GCN 9387). Stacking only images that
increase the limiting magnitude yields:
mean 1-sig. 1-sig.
time 3-sig. sys. stat.
since lim. cal. cal. cal.
trig. tel. exp. fil. mag. stars unc. unc.
(m) (# x s) (mag) (mag)
5.2 PROMPT-4 4 x 40 I 18.2 229 USNO B1 0.372 0.001
+ 1 x 10
5.8 PROMPT-5 2 x 40 V 18.3 72 NOMAD 0.146 0.001
6.4 PROMPT-2 1 x 80 R 19.3 217 USNO B1 0.305 0.001
+ 2 x 40