GRB 060712
GCN Circular 5301
Subject
GRB 060712: Swift detection of a burst
Date
2006-07-12T21:29:42Z (19 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
J. R. Cummings (NASA/ORAU), S. D. Barthelmy (GSFC), C. Gronwall (PSU),
S. T. Holland (GSFC/USRA), J. A. Kennea (PSU),
F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), M. Perri (ASDC),
M. Stamatikos (NASA/ORAU) and L. Vetere (ASDC) report on behalf of
the Swift Team:
At 21:07:43 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 060712 (trigger=218582). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA,Dec 184.061, +35.560 {12h 16m 15s, +35d 33' 35"} (J2000)
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows very little structure
above background. This is a 6.7-sigma detection in BAT spread over ~26 sec
so little is expected to be seen in the BAT lightcurve. The peak count rate
was ~500 counts/sec (15-350 keV).
The XRT began taking data at 21:10:47 UT, 184 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. However analysis of the
downlinked Photon Counting mode data reveals a point source at the
following coordinates: RA(J2000) = 12:16:16.3, Dec(J2000) = +35:32:17.7
with an error radius of 4.2 arcseconds (90% confidence). This position
is 81 arcseconds from the BAT position.
UVOT was in an engineering mode, so no UVOT data are currently available.
GCN Circular 5303
Subject
GRB060712: MASTER optical observation
Date
2006-07-12T21:59:12Z (19 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
V. Lipunov, V.Kornilov, D.Kuvshinov, N.Tyurina, A.Belinski, E.Gorbovskoy,
A.Krylov, G.Borisov, A.Sankovich, M.Sinitsin, P.Gritsyk
Sternberg Astronomical Institute, Moscow Union 'Optic'
MASTER robotic system (http://observ.pereplet.ru) responded to
GRBGRB060712
(GRB_TIME is 2006-03-19 21:07:43.71) at high zenit distance jn the west at
white night.
The first R image was at 2006-07-12 21:10:32 UT, 72 s after notice time and
212 s after the GRB time
The robot not find OT-candidate in error box brighter then 14.5 (s/n=3).
The reduction is continuing.
This work is supported by RFFI 04-02-16411 grant.
This message can be cited.
Mailto: lipunov@sai.msu.ru
GCN Circular 5304
Subject
GRB 060712: Refined analysis of the Swift-BAT burst
Date
2006-07-13T01:47:07Z (19 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
D. Hullinger (BYU-Idaho), L. Barbier (GSFC), S. D. Barthelmy (GSFC),
J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC),
H. Krimm (GSFC/USRA), M. Koss (GSFC/UMD), C. Markwardt (GSFC/UMD),
D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU),
G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC)
on behalf of the Swift-BAT team:
Using the data set from T-119 to T+183 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 060712 (trigger #218582)
(Cummings, et al., GCN Circ. 5301). The BAT ground-calculated position
is RA,Dec = 184.065, +35.539 deg {12h 16m 15.7s, +35d 32' 21.6"} (J2000)
+- 2.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 9%.
The lightcurve for this weak source shows approximately 3 overlapping peaks
starting at T_zero and lasting unit ~T+35 sec. T90 (15-350 keV) is 26 +- 5 sec
(estimated error including systematics).
The time-averaged spectrum from T+0.6 to T+29.7 is best fit by a simple
power-law model. The power law index of the time-averaged spectrum
is 1.64 +- 0.32. The fluence in the 15-150 keV band is
1.3 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured
from T+16.76 sec in the 15-150 keV band is 1.7 +- 0.6 ph/cm2/sec.
All the quoted errors are at the 90% confidence level.
GCN Circular 5305
Subject
GRB 060712: XRT refined position
Date
2006-07-13T02:03:40Z (19 years ago)
From
Loredana Vetere at ASDC <vetere@asdc.asi.it>
L. Vetere (ADSC), M.L.Conciatore (ASDC), J. R. Cummings (NASA/ORAU)
report on behalf of the Swift/XRT team:
XRT started observing the field of GRB060712 193 s after BAT trigger
in PC mode. The 2.2 ks analysis of the first two orbits provides the
refined XRT position:
RA(J2000) = 12h 16m 16.3s,
Dec(J2000) = +35d 32m 17.8s
with an uncertainty of 3.8 arcsec (90% containment). This position is
0.1 arcsec away from the XRT position quoted in Cummings et al.
(GCN5301) and 8.2" arcseconds from the refined BAT position (GCN5304).
The light curve shows a fast initial decay.
Further osbervations are ongoing.
This circular is an official product of the Swift XRT Team.
GCN Circular 5307
Subject
GRB 060712: Swift/UVOT Upper Limits
Date
2006-07-13T15:09:29Z (19 years ago)
From
Stephen Holland at USRA/NASA/GSFC/SSC <sholland@milkyway.gsfc.nasa.gov>
GRB 060712: Swift/UVOT Upper Limits
S. T. Holland (GSFC/USRA) reports on behalf of the Swift/UVOT team:
The Swift UVOT began taking data on the field of GRB 060712 (Swift
Trigger 218582) 4983 s after the BAT trigger (Cummings et al. 2006,
GCN Circular 5301). UVOT was in an engineering mode when the burst
occurred so it did not make prompt observations of the field of this
burst. No new source, relative to the DSS, is seen in any of the UVOT
exposures inside the XRT error circle (Vetere et al. 2006, GCN
Circular 5305). The 3-sigma upper limits are:
Midpoint Exposure
Filter Time (s) (s) Mag
V 5141 197 19.44 3-sigma upper limit
B 5959 197 20.64 3-sigma upper limit
U 5754 197 20.06 3-sigma upper limit
UVW1 5550 197 20.16 3-sigma upper limit
UVM2 5345 197 19.38 3-sigma upper limit
White 4985 98 19.88 3-sigma upper limit (160-650 nm)
These upper limits have not been corrected for the estimated Galactic
reddening of E_{B-V} = 0.01 mag (Schlegel et al. 1998).
/
\
/
GCN Circular 5308
Subject
GRB 060712: XRT refined analysis
Date
2006-07-13T17:13:52Z (19 years ago)
From
Loredana Vetere at ASDC <vetere@asdc.asi.it>
L. Vetere, M.L. Conciatore (ASDC), J. R. Cummings (NASA/ORAU)
report on behalf of the Swift/XRT team:
We have analysed the first 10 orbits of X-ray data for GRB 060712 for
a total exposure time of 18 ks (up to ~14.5 h since the BAT trigger).
The PC light curve, from 300 s after the BAT trigger can be fitted
with a single powerlaw with decay index of 0.65 +/- 0.06.
The 0.3-10 keV PC spectrum is well fitted by an absorbed power law
with photon index of 2.7 +/- 0.4 with an nH value of (1.6 +/-0.9)e21
cm^-2, greater than the Galactic value of 0.13e21 cm^-2.
The predicted unabsorbed flux at 24 hours after the BAT trigger is
6.8e-13 ergs cm^-2 s^-1.
This circular is an official product of the Swift XRT Team.
GCN Circular 5309
Subject
GRB060712: P60 Observations
Date
2006-07-13T17:35:43Z (19 years ago)
From
S. Bradley Cenko at Caltech <cenko@srl.caltech.edu>
S. B. Cenko and E. O. Ofek (Caltech) report on behalf of a larger
collaboration:
We have imaged the field of GRB 060712 (Cummings et al; GCN 5301) with the
automated Palomar 60-inch telescope. Observations consisted of 5 x 180 s
exposures in the Kron R and Sloan i' filters taken at a mean epoch of
approximately UT July 13.22 (~ 8.3 hours after the burst). Inside the
revised XRT error circle (Vetere et al; GCN 5305), we find no evidence
for any sources. The limiting magnitude of our observation is R < 20.5.