GRB 060607
GCN Circular 5233
Subject
GRB 060607: Swift detection of a burst with bright optical counterpart
Date
2006-06-07T05:43:28Z (19 years ago)
From
Jamie A. Kennea at PSU/Swift-XRT <kennea@astro.psu.edu>
H. Z. Ziaeepour (UCL-MSSL), S. D. Barthelmy (GSFC),
N. Gehrels (NASA/GSFC), M. R. Goad (U Leicester), J. A. Kennea (PSU),
H. A. Krimm (GSFC/USRA), K. M. McLean (LANL/UTD),
S.R. Oates (UCL-MSSL), K. L. Page (U Leicester) and
M. Stamatikos (NASA/ORAU) report on behalf of the Swift Team:
At 05:12:13 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 060607 (trigger=213823). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA,Dec 329.712, -22.506 {21h 58m 51s, -22d 30' 20"} (J2000)
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a double-peaked
structure with a duration of about 40 sec. The peak count rate
was ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 05:13:18 UT, 65 seconds after the
BAT trigger. XRT found a bright, variable, uncatalogued X-ray source
located at RA(J2000) = 21h 58m 50.1s, Dec(J2000) = -22d 29' 49.9", with an
estimated uncertainty of 4.7 arcseconds (90% confidence radius).
This location is 33 arcseconds from the BAT on-board position, within
the BAT error circle. The initial flux in the 2.5s image was
3.3e-09 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 100 seconds with the White
(160-650 nm) filter starting 75 seconds after the BAT trigger. There
is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image
at (RA,DEC) (J2000) of (329.7100,-22.4963) or
(21h58m50.40s,-22o29'46.7") with a 1-sigma error radius of about 0.5
arc sec. This position is 4.7 arc sec. from the center of the XRT
error circle. The estimated magnitude is 15.7 with a 1-sigma error of
about 0.5 mag. No correction has been made for the expected extinction
corresponding to E(B-V) of 0.03.
GCN Circular 5234
Subject
GRB 060607: REM NIR afterglow
Date
2006-06-07T05:47:54Z (19 years ago)
From
Stefano Covino at Brera Astronomical Observatory <stefano.covino@brera.inaf.it>
S. Covino, E. Distefano, E. Molinari, G. Chincarini, F.M. Zerbi, V.
Testa, G. Tosti, F. Vitali, P. Conconi, L.A. Antonelli, G. Cutispoto,
G. Malaspina, L. Nicastro, E. Palazzi, E. Meurs, and P. Goldoni
report on behalf of the REM/ROSS team:
We imaged the field of GRB 060607 (Ziaeepour et al. GCN 5233) the
robotic 60-cm REM telescope located at La Silla (Chile. A first set
of observations was performed automatically in the near infrared (J,
H, K, z bands) starting on June 5:13:45UT.
A preliminary analysis reveals an uncatalogued source of H ~ 13.3 at
RA,DEC = (21:58:50.4, -22:29:47).
Further observations are in progress.
This message may be cited.
[GCN OPS NOTE(07jun06): Per author's request the spelling of the second
author's name was corrected.]
GCN Circular 5236
Subject
GRB 060607: PROMPT Observations
Date
2006-06-07T06:15:38Z (19 years ago)
From
Melissa Nysewander at UNC,Chapel Hill <mnysewan@physics.unc.edu>
M. Nysewander, J. Haislip report on behalf of the UNC GRB Team:
PROMPT began observing the position of the XRT error circle (Ziaeepour et
al., GCN 5233) 44 seconds after the GRB trigger, 25 seconds after the
initial alert in Ugriz.
We confirm the presence of the bright, fading optical afterglow: in our
initial r' image, we find the source to be r' ~ 16.3 at a mean time of 65
seconds after the burst. It then brightened to r' ~ 16 at 90-s, and by
140-s it had risen to a magnitude of r' ~ 14.5.
GCN Circular 5237
Subject
VLT/UVES observations of GRB 060607
Date
2006-06-07T07:08:07Z (19 years ago)
From
Paul Vreeswijk at ESO <pvreeswi@eso.org>
Cedric Ledoux (ESO), Paul Vreeswijk (U. of Chile/ESO), Alain Smette
(ESO), Andreas Jaunsen (U. of Oslo), and Andreas Kaufer (ESO) report
on behalf of a larger collaboration:
"We triggered Rapid-Response Mode VLT observations with the
Ultraviolet and Visual Echelle Spectrograph (UVES) following the Swift
detection of GRB 060607 (Ziaeepour et al., GCN 5233). A series of
exposures were started at 5:19:52 UT, i.e. 7.5 minutes after the
Swift/BAT trigger. The spectra cover the approximate wavelength range
330-670nm at a resolving power of about 7 km/s. A preliminary analysis
shows the Lya forest up to a rather weak Lya line, as well as a CIV
doublet at a redshift of z=3.082, the presumed GRB redshift. We also
detect two probable intervening Damped Lya systems (DLAs) at z=3.050
and z=2.937.
It's a pleasure to thank the excellent support of the Paranal staff."
GCN Circular 5239
Subject
GRB 060607: IR observations
Date
2006-06-07T12:49:58Z (19 years ago)
From
Daniel Perley at U.C. Berkeley <dperley@astro.berkeley.edu>
D. Perley, N. Butler, and Y. Kemper (UCB) report:
Starting at 2006-06-07 10:34 UT (5.37 hours after the trigger) we imaged
the field of GRB060607 (GCN 5233) using the Lick 3m telescope equipped
with the Gemini IR camera under high airmass conditions and intermittent
clouds. We do not detect the afterglow (GCN 5233, GCN 5234) down to a
preliminary limiting magnitude of J=17.2 (3 sigma) in a series of
dithered exposures lasting 60 minutes.
GCN Circular 5240
Subject
GRB 060607: Swift-XRT Team refined analysis
Date
2006-06-07T13:10:12Z (19 years ago)
From
Kim Page at U.of Leicester <kpa@star.le.ac.uk>
Kim Page, Mike Goad & Andy Beardmore (U. Leicester) report on behalf of
the Swift-XRT team:
We have analysed the first 3 orbits of X-ray data obtained for GRB 060607
(BAT trigger 213823; Ziaeepour et al., GCN 5233).
The data show 3 flares, superimposed on a decay of alpha_1 = 1.09 +/-
0.04. Around 740 seconds after the trigger, the slope flattens, becoming
alpha_2 = 0.45 +/- 0.03.
The flares in the WT data show spectral evolution. The later PC data are
well-fitted by a single power-law with Gamma = 1.64 +/- 0.07, with excess
NH above the Galactic value. Taking the redshift to be 3.082 (Ledoux et
al; GCN 5237), the intrinsic NH is (7.9 +3.8/-3.5)e21 cm^-2.
Assuming the shallow decay of alpha_2 = 0.37 continues, the count rate is
estimated to be 0.49 count s^-1 at 24 hours. This corresponds to an
observed (unabsorbed) flux of 2.22e-11 (2.44e-11) erg cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.
GCN Circular 5241
Subject
GRB 060607: optical limit by "Pi of the Sky"
Date
2006-06-07T13:39:01Z (19 years ago)
From
Grzegorz Wrochna at Soltan Inst.for Nuclear Studies <wrochna@fuw.edu.pl>
M.Cwiok, W.Dominik, G.Kasprowicz, K.Malek, L.Mankiewicz, M.Molak,
J.Mrowca-Ciulacz, K.Nawrocki, L.W.Piotrowski, P. Sitek, M.Sokolowski,
J.Uzycki, G.Wrochna, on behalf of "Pi of the Sky" collaboration
"Pi of the Sky" apparatus located at Las Campanas Observatory
has moved to the Swift-BAT trigger 213823 and it has taken a series
of 10s exposures starting 124s after the GRB (105s after the alert).
No new object has been found within the Swift-BAT error box.
The limiting magnitude is 12.5m (unfiltered) for single exposures
and 13.4m for the sum of 10 images.
More information at http://grb.fuw.edu.pl/pi/grb.htm
GCN Circular 5242
Subject
GRB 060607: Swift-BAT Refined Analysis
Date
2006-06-07T19:41:47Z (19 years ago)
From
Hans Krimm at NASA-GSFC <krimm@milkyway.gsfc.nasa.gov>
J. Tueller (GSFC), L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (BYU-Idaho), M. Koss (GSFC/UMD), H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC),
T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/JSPS/USRA), M. Stamatikos (GSFC/ORAU),
on behalf of the Swift-BAT team:
Using the data set from T-119.6 to T+182.5 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 060607
(trigger #213823) (Ziaeepour, et al., GCN 5233). The BAT
ground-calculated position
is (RA,Dec) = 329.712, -22.500 deg {21h 58m 50.8s, -22d 30' 0.0"} (J2000)
+- 0.8 arcmin, (radius, sys+stat, 90% containment). The partial
coding was 99%.
The mask weighted light curve consists of two overlapping FRED peaks from
T-5 sec to T+40 sec. There is a second double peaked structure between
T+95 sec and T+105 sec. T90 (15-350 keV) is 100 +- 5 sec
(estimated error including systematics).
The time-averaged spectrum from T-14.1 to T+104.5 is best fit by
a simple power-law model. The power law index of the time-averaged
spectrum is 1.45 +- 0.07. The fluence in the 15-150 keV band is
2.6 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured
from T-0.97 sec in the 15-150 keV band is 1.4 +- 0.1 ph/cm2/sec.
All the quoted errors are at the 90% confidence level.
Using the redshift of 3.082 reported by Ledoux et al (GCN 5237) and a
cosmology of Omega_M - 0.3, Omega_lamba = 0.7 H0 = 65, we find
Eiso (1-1000 keV in the rest frame) to be 1.1 X 10^53 ergs. This is based
on an extrapolation of the BAT power law fit into the corresponding
observer energy band.
GCN Circular 5248
Subject
GRB 060607: RTT150 optical observations
Date
2006-06-09T12:50:33Z (19 years ago)
From
Irek Khamitov at TUG <irekk@tug.tug.tubitak.gov.tr>
I. Khamitov (TUG), A.T. Saygac (Ist.Uni), Z. Aslan (TUG),
U. Kiziloglu (METU), E. Gogus (Sabanci Uni.)
R. Burenin, M. Pavlinsky (IKI)
I. Bikmaev, N. Sakhibullin (KSU/AST),
report:
We observed the field around the position of the optical/IR counterpart
(Covino et al., GCN5234, Oates et al., GCN5243) of GRB060607 (Swift
trigger 213823) with the Russian-Turkish 1.5-m telescope (RTT150,
Bakirlitepe, TUBITAK National Observatory, Turkey), at the beginning
of June 08, about 19.77 hours after the burst. A series of frames was
taken in R band with TFOSC. The afterglow is not detected on combined
image with 1500s total exposure.
http://www.tug.tubitak.gov.tr/~irekk/grb/grb060607/GRB060607_0608_RTT150.JPG
Using USNO-B1 star we estimate the limiting R magnitude
for the combined frame as R_lim~22.6
This message may be cited.