GRB 061109
GCN Circular 5790
Subject
GRB 061109: Swift detection of a possible burst
Date
2006-11-09T00:57:49Z (19 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
A. D. Falcone (PSU), S. D. Barthelmy (GSFC),
A. P. Beardmore (U Leicester), M. M. Chester (PSU),
J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC),
J. A. Kennea (PSU), C. B. Markwardt (GSFC/UMD),
F. E. Marshall (NASA/GSFC), K. M. McLean (LANL/UTD), C. Pagani (PSU),
D. M. Palmer (LANL), G. Sato (GSFC/ISAS) and L. Vetere (PSU) report on
behalf of the Swift Team:
At 00:30:19 UT, the Swift Burst Alert Telescope (BAT) triggered and
located a possible GRB 061109 (trigger=237821). Swift slewed
immediately to the location. The BAT on-board calculated location is
RA,Dec 311.747, +24.166 {+20h 46m 59s, +24d 09' 59"} (J2000) with an
uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty).
The XRT began taking data at 00:31:28 UT, 69 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. The prompt lightcurve
from XRT reveals no detectable emission. We are waiting for
down-linked data to detect and determine if an afterglow is present.
The usual UVOT data products (finding charts and source lists)
will be available when the full data set is down and processed
at ~02:15 UT.
Due to a problem in the telemetry stream that started part way through
the sequence of messages that come down TDRSS for each trigger, we do
not have any BAT lightcurves, XRT images or any of the UVOT messages.
GCN Circular 5791
Subject
GRB 061109: TAROT Calern observatory optical observations
Date
2006-11-09T01:37:27Z (19 years ago)
From
Alain Klotz at CESR-CNRS <Alain.Klotz@free.fr>
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 061109 detected by SWIFT
(trigger 237821) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France. When this
message is written, this trigger is only suspected
to be a GRB (Falcone et al. GCNC 5790).
The observations started 59.1s after the GRB trigger
(45s after the notice). The elevation of the field decreased from
from 2 degrees above horizon with a lot of humidity (86%).
The date of trigger : t0 = 2006-11-09T00:30:19.584
The first image is 30.0s exposure in tracking mode:
We do not detect any OT with a limiting magnitude of:
t0+59.1s to t0+89.1s : R > 14.1
The second image is 30.0s exposure in tracking mode:
t0+95.4s to t0+125.4s : R > 14.1
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon= 68.2186 lat=-11.8641
and the galactic extinction in R band is 0.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular 5792
Subject
GRB 061109: optical observation
Date
2006-11-09T02:50:57Z (19 years ago)
From
Ken ichi Torii at Osaka U <torii@ess.sci.osaka-u.ac.jp>
K. Torii (Osaka U.) reports:
The error region of the possible GRB 061109 (Falcone et al. GCN 5790)
was observed with the 0.3m telescope in the New Mexico Skies
Observatory. Starting at 261 s after the trigger time, five frames of
120s exposure were acquired through Ic filter. The first frame was
partly saturated and turned out to be useless.
We do not identify a new object within the BAT error circle and
derive the following upper limits relative to USNO-B1.0 I magnitude.
------------------------------------------
StartUT Filter Mag Nframes
------------------------------------------
00:43:30 Ic >15.0 1
00:46:25 Ic >15.5 1
------------------------------------------