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GCN Circular 10035

Subject
GRB 091015: Skynet/PROMPT Observations
Date
2009-10-18T21:20:57Z (15 years ago)
From
Aaron LaCluyze at U.North Carolina <lacluyze@physics.unc.edu>
A. LaCluyze, D. Reichart, K. Ivarsen, J. Haislip, R. Egger, A. Foster, J. 
Moore, A. Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. 
Nysewander report:

Skynet observed ~90% of the INTEGRAL/IBAS localization of GRB 091015 
(Ferrigno et al., GCN 10025; Gotz, GCN 10026) with one of the 16" PROMPT 
telescopes at CTIO beginning 25.3 hours after the the trigger in z.

We do not detect any uncatalogued sources.  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.
(h)              (# x s)                              (mag)   (mag)

27.1   PROMPT-5  144 x 80  z*    21.2    319 USNO B1  0.313   0.000

* Calibrated to I
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