GRB 060209

J. Osborne (U Leicester), S. Barthelmy (GSFC), N. Gehrels (GSFC),
J. Kennea (PSU), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
F. Marshall (GSFC), K. Page (U Leicester), D. Palmer (LANL),
T. Sakamoto (GSFC/ORAU), P. Schady (PSU/UCL-MSSL)
on behalf of the Swift team:

At 19:08:55 UT, Swift-BAT triggered and located GRB 060209 (trigger=180931).
The spacecraft slewed immediately.  The BAT on-board calculated location is
RA,Dec 65.454,+58.730d {04h 21m 49s,+58d 43' 47"} (J2000), with an uncertainty
of 3 arcmin (radius, 90% containment, stat+sys).  The TDRSS lightcurve
does not show anything significant (in T-20 to T+128 sec) which is consistant
with a weak short burst and with a cosmic ray shower.  We will not be able
to distinguish these until we get the full data in about an hour.

The XRT began taking data at 19:10:00 UT, 64 seconds after the BAT
trigger.  The XRT on-board centroid algorithm did not find a source in the
image and no prompt position is available.  We are waiting for down-linked
data to detect and determine a position for the source.

UVOT took a finding chart exposure of 200 seconds with the V filter
starting 65 seconds after the BAT trigger.  No afterglow candidate
has been found in the initial data products.  The 2.7'x2.7' sub-image
covers 25% of the BAT error circle.  The typical 3-sigma upper limit
has been about 18th mag.  The 8'x8' region for the list of sources
generated on-board covers 100% of the BAT error circle.  The list
of sources is typically complete to about 18.0 mag.  No correction
has been made for the expected extinction of about 2.9 magnitudes.

Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:

We imaged the field of GRB 060209 detected by SWIFT
(trigger 180931) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

First image was acquired 23.7s after the GCN trigger
(10s after the notice). The field elevation decreased from
74 degrees above horizon and weather conditions
were good (moon at 41.0deg, phase=0.79).
All images are not filtered.

Date of trigger : t0 = 2006 feb. 09 19:08:55.95 UTC

First image is 30s exposure trailed. No OT is visible:
t0+23.7s to t0+83.7s : R > 15.8

Second image is 30s exposure. No OT is visible:
t0+90.2s to t0+120.2s : R > 17.2

We co-added a series of exposures. No OT is visible:
t0+90.2s to t0+967.1s : R > 18.3

Galactic coordinates are lon=147.439131 lat=6.264359
and the galactic extinction in R band is 2.3 magnitudes
from D. Schlegel et al. 1998ApJ...500..525S.

Magnitudes were estimated with the nearby USNO-B1

This message may be cited.

I. Khamitov, Z. Aslan (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.),
I. Bikmaev, N. Sakhibullin (KSU/AST)
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI)

report:

    The error circle of GRB 060209 (Swift-BAT Trigger 180931,
Osborne et al., GCN 4717
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 ) was  observed with Russian-Turkish
1.5-m telescope (RTT150, Bakyrlytepe, TUBITAK National Observatory,
Turkey) in R, starting on Feb. 09, 19:17 UT, i.e. ~8min after the burst.

    A series of frames (2*60s, 9*100s exposures) were taken under bad 
weather conditions. We did not detect new source. Using USNO-B1 stars we 
estimate limiting magnitude of combined image as: R~20.3

This message may be cited.

[GCN OPS NOTE(09dec06): The Subject-line was changed from "060204"
to "060209" to match the contents of the Circular.]