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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 
9386Not found
 
 
) 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 9386Not found
 
 
) within the enhanced 
Swift/XRT localization (Evans et al., GCN 9387Not found
 
 
).  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