GCN Circular 10016
Subject
GRB 090531A: Skynet/PROMPT Observations
Date
2009-10-11T21:32:42Z (15 years ago)
From
Aaron LaCluyze at U.North Carolina <lacluyze@physics.unc.edu>
A. LaCluyze, D. Reichart, J. Haislip, K. Ivarsen, 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 090531A (Stamatikos et
al., GCN 9454) with three of the 16" PROMPT telescopes at CTIO beginning
6.1 minutes after the trigger in UVRI.
We do not detect the afterglow (Sbarufatti & Mangano, GCN 9525). 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)
6.5 PROMPT-5 1 x 40 I 17.6 32 SDSS 7 0.055 0.002
15.3 PROMPT-5 11 x 80 I 19.4 32 SDSS 7 0.055 0.000
84.0 PROMPT-3 75 x 80 U 19.3 7 SDSS 7 0.037 0.001
92.6 PROMPT-5 85 x 80 I 20.5 32 SDSS 7 0.055 0.000
+ 1 x 40
94.1 PROMPT-4 43 x 80 V 21.1 37 SDSS 7 0.007 0.000
104.8 PROMPT-4 54 x 80 R 21.3 40 SDSS 7 0.018 0.000
* Transformed using Jester et al., 2005, ApJ, 130, 873.