GRB 080303A
GCN Circular 7349
Subject
GRB 080303A: ROTSE-III Optical Limits
Date
2008-03-03T09:38:13Z (17 years ago)
From
Brad Schaefer at LSU <schaefer@grb.phys.lsu.edu>
B. E. Schaefer (Louisiana State) and W. Rujopakarn (Steward), report on
behalf of the ROTSE collaboration:
ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded to
GRB 080303A (Swift trigger 304549), producing images beginning 8.4 s after
the GCN notice time. An automated response took the first image at
09:10:55.3 UT, 20.0 s after the burst, and during the gamma-ray emission,
under twilight conditions. We took 10 5-sec, 10 20-sec and 10 60-sec
exposures. These unfiltered images are calibrated relative to USNO A2.0
(R). Imaging is on going.
Comparison to the DSS (second epoch) reveals no new sources within the
3-sigma Swift/BAT error circle or the XRT error circle, for both single
images and coadding into sets of 10; the field is not crowded. Individual
images have limiting magnitudes ranging from 13.3-15.8, with the poor
limits at the start due to the bright twilight that was rapidly fading.
We set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
09:10:55.4 09:11:00.4 5 13.3 20.1 N
09:10:55.4 09:13:06.9 131 14.1 20.1 Y
09:21:35.1 09:29:30.1 475 16.2 659.8 Y
GCN Circular 7353
Subject
GRB 080303A: Faulkes Telescope South optical afterglow observations
Date
2008-03-03T11:19:42Z (17 years ago)
From
Andreja Gomboc at LT,ARI,Liverpool JMU <ag@astro.livjm.ac.uk>
A. Gomboc (U. Ljubljana), R.J. Smith, D.F. Bersier, S. Kobayashi, A.
Melandri, A. Monfardini, C.G. Mundell, I.A. Steele (Liverpool JMU), C.
Guidorzi (U. Bicocca & INAF-OAB), P. O'Brien, E. Rol, N. Bannister
(Leicester) report:
The 2-m Faulkes Telescope South (Siding Spring) robotically followed up
GRB 080303A (SWIFT trigger 304549) starting 3.3 min after the GRB trigger
time. We detect an optical afterglow candidate in R, B, and i' filters at
the position consistent with the UVOT (Sakamoto et al, GCN 7351),
REM (D'Avanzo et al., GCN 7350) and Mt. John (Gilmore & Kilmartin, GCN
7352) optical afterglow candidate.
The magnitude of the source was R~17.4+-0.3 and 19.7+-0.3 at 8 min and 50
min after the trigger time, respectively.