GCN Circular 9996

Subject

GRB 090926B: Skynet/PROMPT Observations

Event

Date

2009-10-06T04:07:49Z (16 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 090926B (Grupe et al., 
GCN 9935Loading...
 
 ) with four of the 16" PROMPT telescopes at CTIO beginning 2.7 
hours after the trigger in UVRI.

We do not detect the afterglow (Grupe et al., GCN 9935Loading...
 
 ; Malesani, Fynbo & 
D'Elia, GCN 9944Loading...
 
 ).  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)

2.7    PROMPT-4  4 x 80   R     19.9    40 USNO B1  0.424   0.002
2.7    PROMPT-2  4 x 80   V     18.2    11 NOMAD    0.099   0.003
2.7    PROMPT-5  3 x 80   I     18.2    32 USNO B1  0.414   0.003