GRB 080607
GCN Circular 7846
Subject
GRB 080607: ROTSE-III Detection of Optical Counterpart
Date
2008-06-07T06:11:50Z (17 years ago)
From
Wiphu Rujopakarn at U AZ/Steward <wiphu@as.arizona.edu>
W. Rujopakarn (Steward), E.S. Rykoff (UCSB), report on behalf of the ROTSE
collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
080607 (Swift trigger 313417). The first image was at 06:07:49.0 UT, 22.0
s after the burst (6.0 s after the GCN notice time). The unfiltered images
are calibrated relative to USNO A2.0. We detect a 14.8 magnitude, fading
source with coordinates:
12:59:47.3 +15:55:10.8 (J2000), with positional uncertainty
of 1" or better
start UT mag mlim(of image)
----------------------------------
06:07:49.0 14.8 16.4
This source is not visible in DSS (second epoch), 2MASS or the MPChecker
database.
A jpeg image is available at
http://www.rotse.net/images/gsb313417_3b00_img.jpg Note that the object
marked 11 is the candidate in question.
Continuing observations are in progress.
GCN Circular 7847
Subject
GRB 080607: Swift detection of a burst with optical afterglow
Date
2008-06-07T06:21:44Z (17 years ago)
From
Vanessa Mangano at INAF-IASFPA <vanessa@ifc.inaf.it>
V. Mangano (INAF-IASFPA), J. R. Cummings (NASA/UMBC),
G. Cusumano (INAF-IASFPA), N. Gehrels (NASA/GSFC),
V. La Parola (INAF-IASFPA), C. B. Markwardt (CRESST/GSFC/UMD),
J. P. Osborne (U Leicester), B. Sbarufatti (INAF-IASFPA) and
D. E. Vanden Berk (PSU) report on behalf of the Swift Team:
At 06:07:27 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 080607 (trigger=313417). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 194.967, +15.900 which is
RA(J2000) = 12h 59m 52s
Dec(J2000) = +15d 54' 01"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a multi-peak
structure with a duration of about 80 sec. The peak count rate
was ~35000 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 06:08:49.1 UT, 82.1 seconds after
the BAT trigger. XRT found a bright, uncatalogued X-ray source located
at RA, Dec 194.9462, +15.9208 which is equivalent to:
RA(J2000) = 12h 59m 47.0s
Dec(J2000) = +15d 55' 14.8"
with an uncertainty of 5.0 arcseconds (radius, 90% containment). This
location is 103 arcseconds from the BAT onboard position, within the
BAT error circle. No event data are yet available to determine the
column density using X-ray spectroscopy.
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm)
filter starting 92 seconds after the BAT trigger. There is a candidate
afterglow in the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 12:59:47.21 = 194.9467
DEC(J2000) = +15:55:10.9 = 15.9197
with a 1-sigma error radius of about 0.5 arc sec. This position is 4.9 arc sec.
from the center of the XRT error circle. The estimated magnitude is 19.7 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 0.02.
Burst Advocate for this burst is V. Mangano (vanessa AT ifc.inaf.it).
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular 7848
Subject
GRB 080607: Super-LOTIS early observations
Date
2008-06-07T06:50:38Z (17 years ago)
From
Adria C. Updike at Clemson U <aupdike@clemson.edu>
Adria C. Updike (Clemson University), Peter A. Milne (Steward
Observatory), and G. Grant Williams (MMTO) report:
Super-LOTIS began observing GRB 080607 35 second after the trigger
(313417). We detect the fading source reported by Rujopakarn et al. (GCN
7846) at R = 15.2 +/- 0.05 mag (as compared to a nearby star in the USNO
B1.0 catalog) 40 seconds after the trigger. Observations are continuing.
This message may be cited.
GCN Circular 7849
Subject
GRB 080607: Keck/LRIS spectroscopy and redshift
Date
2008-06-07T07:47:19Z (17 years ago)
From
Daniel Perley at U.C. Berkeley <dperley@astro.berkeley.edu>
J. X. Prochaska (UCO/Lick), J. Shiode, J. S. Bloom, D. A. Perley, A. A.
Miller, J. Shiode, D. Starr, R. Kennedy, and J. Brewer (UC Berkeley) report:
Upon receiving the GCN alert we immediately slewed with Keck I (+LRIS)
to the field of GRB 080607 (GCN 7847, Mangano et al.). The optical
transient (GCN 7846, Rujopakarn et al.) was visually identified on the
guider. Spectroscopic observations began at 06:20:35 UT, 13 minutes
after the trigger, using the 600 and 400 line gratings on the blue and
red cameras, respectively, for wavelength coverage between 3000-9300 A.
Our preliminary reduction of the LRIS-b spectrum reveals a very strong,
damped Lya profile and metal-line transitions of OI, SiII, CII, SiII*
among others. These establish the redshift of the GRB to be z=3.036.
GCN Circular 7850
Subject
GRB 080607 - PAIRITEL NIR detection
Date
2008-06-07T07:53:03Z (17 years ago)
From
Adam Miller at UC Berkeley <amiller@astro.berkeley.edu>
A. A. Miller, J. S. Bloom, D. A. Perley (UC Berkeley), D. Starr (UCB,
LCOGT) report:
We observed the optical afterglow of GRB 080607 (Mangano et al., GCN
7847, Rujopakarn et al., GCN 7846) with the 1.3m Peters Automated Infrared
Imaging Telescope (PAIRITEL). Observations began at 06:08:44 Jun 07,
2008 UT. We detect the afterglow in a 612 sec mosaic of 7.8 sec
simultaneous exposures in the J, H, and Ks filters. Preliminary
photometry for the afterglow in exposures beginning on 06:10:32 Jun 07,
2008 UT yields J = 17.1 +- 0.1, H = 15.3 +- 0.1, and Ks = 13.7 +- 0.1,
calibrated to the 2MASS system.
GCN Circular 7852
Subject
GRB 080607, Swift-BAT refined analysis
Date
2008-06-07T12:03:45Z (17 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
M. Stamatikos (GSFC/ORAU), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC),
J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC),
H. Krimm (GSFC/USRA), V. Mangano (INAF-IASFPA), C. Markwardt (GSFC/UMD),
K. McLean (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC),
G. Sato (ISAS), J. Tueller (GSFC), T. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-240 to T+302 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 080607 (trigger #313417)
(Mangano, et al., GCN Circ. 7847). The BAT ground-calculated position is
RA, Dec = 194.964, 15.910 deg, which is
RA(J2000) = 12h 59m 51.4s
Dec(J2000) = +15d 54' 37.6"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 11%.
The mask-weighted light curve shows multiple peaks. The first starts at ~T-5 sec.
The main cluster of overlapping peaks starts at ~T-1 sec, with the brightest
peak at T+2.0 sec, and ending at ~T+10 sec. Following that is a series
of weak peaks out to ~T+180 sec. T90 (15-350 keV) is 79 +- 5 sec
(estimated error including systematics).
The time-averaged spectrum from T-5.9 to T+154.7 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.31 +- 0.04. The fluence in the 15-150 keV band is 2.4 +- 0.0 x 10^-05 erg/cm2.
The 1-sec peak photon flux measured from T+1.50 sec in the 15-150 keV band
is 23.1 +- 1.1 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/313417/BA/
GCN Circular 7853
Subject
GRB 080607: Enhanced Swift-XRT position
Date
2008-06-07T13:22:23Z (17 years ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester)
report on behalf of the Swift-XRT team.
Using 818 s of overlapping XRT Photon Counting mode and UVOT
data for GRB 080607, we find an astrometrically corrected X-ray
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 194.94644, +15.91935 which is equivalent
to:
RA (J2000): 12h 59m 47.15s
Dec (J2000): +15d 55' 09.7"
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position
can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is
described by Goad et al. (2007, A&A, 476, 1401
http://www.swift.ac.uk/xrt_positions/Goad.pdf), the current algorithm is an
extension of this method.
This circular was automatically generated, and is an official product of the
Swift-XRT team.
GCN Circular 7856
Subject
GRB 080607 KAIT observations
Date
2008-06-07T19:16:14Z (17 years ago)
From
Ryan Chornock at UC Berkeley <chornock@astro.berkeley.edu>
R. Chornock, W. Li, and A. V. Filippenko (UC Berkeley) report:
The Katzman Automatic Imaging Telescope (KAIT) at Lick Observatory responded to
the Swift alert for GRB 080607 (Mangano et al., GCN 7847) and detected the
optical afterglow previously announced by several other teams (Rujopakarn et
al., GCN 7846; Mangano et al., GCN 7847; Updike et al., GCN 7848; Prochaska et
al., GCN 7849; Miller et al., GCN 7850).
KAIT took a series of V, I, and unfiltered images starting at 06:09:25 (UT),
118s after the BAT trigger. The KAIT position is:
(J2000) 12:59:47.22 +15:55:11.0
The preliminary unfiltered light curve shows a power-law decay from magnitude
17.60 at t=188s with a decay index of alpha = -1.27 +/- 0.09.
GCN Circular 7858
Subject
Swift/UVOT Observations of GRB080607
Date
2008-06-07T21:15:59Z (17 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
P. Schady (MSSL/UCL) and V. Mangano (INAF-IASFPA) report on behalf of the
Swift UVOT team
The Swift UltraViolet/Optical Telescope (UVOT) began taking settled
observations of GRB 080607 92 seconds after the initial Swift BAT trigger
(Mangano et al., GCN Circ. 7847). A faint afterglow is detected in the first
white and v-band finding chart exposures only at the refined uvot position of
RA=194.94665, Dec=+15.91965 deg.(= 12:59:47.20 +15:55:10.74), with an accuracy
of 0.5". This is consistent with the GRB being at a redshift of z=3.036, as
reported in GCN Circ. 7849 (Prochaska et al.)
The first white and v-band finding chart magnitudes with 1-sigma errors are
given below, as well as the 3-sigma upper limits for co-added images from later
observations.
Filter Tmid(s) Exp(s) Magnitude/3-sig UL
---------------------------------------------
wh 190.9 98.2 19.79 +/- 0.13
wh 4806.9 510.6 > 22.07
v 594.6 393.5 19.44 +/- 0.19
v 4048.5 300.2 > 20.11
b 5527.9 412.5 > 21.28
u 4934.2 432.2 > 20.93
uvw1 4934.2 432.1 > 20.80
uvm2 4745.1 432.1 > 20.57
uvw2 5745.6 358.5 > 20.83
---------------------------------------------
where Tmid is the weighted mid time of the observation. The values quoted above
are on the UVOT Photometric System (Poole et al, 2008, MNRAS 383,627). They are
not corrected for the expected galactic reddening of E(B-V) = 0.02 in the
direction of the burst (Schlegel et al. 1998).
GCN Circular 7859
Subject
GRB 080607: Swift-XRT refined analysis
Date
2008-06-07T22:46:45Z (17 years ago)
From
Boris Sbarufatti at INAF-IASF-Pa <sbarufatti@ifc.inaf.it>
B. Sbarufatti, V. Mangano, V. La Parola (INAF-IASF Pa) report on
behalf of
the Swift-XRT team.
Swift-XRT began observations of the field of GRB 080607 (trigger 313417,
Mangano et al., GCN circ. 7847) on date 2008 June 07, 06:08:54 UT, 87 s
after the BAT trigger. The data consist of 478 s in Windowed timing mode
and 3 ks in Photon Counting mode.
The lightcurve shows a complex behaviour. After an initial steep decay
(index 5.8 +/- 0.4) we observe a double peaked flare, starting at
T+ 118 (+/- 1) s and peaking at T+120 s and T+140 s. The underlying
decay breaks at T+ 119 (+ 5, - 2) s to a slope of 1.7 (+/- 0.1). A
second break at t+700 (+/- 300) marks the beginning of a plateau phase
(index 0.5 +/- 1.3). The lightcurve breaks again around
T+1600 (+/- 500) s, with a final decay index of -2.0 +/- 0.5.
The countrate predictions for T+24h and T+48h are 2.1E-3 counts/s
and 5.5E-4 count/s respectively.
The WT spectrum can be fit by a powerlaw with photon index 1.81 +/- 0.02
and an intrinsic absorbing column density of (4.0 +/- 0.2)E22 cm^-2 at
z=3.036 (Prochaska et al. GCN Circ. 7849), in excess with
respect to the Galactic value of 1.69E+20 cm^-2 (Kalberla et al. 2005).
The observed (unabsorbed) flux in the 0.3 - 10 keV band is
2.9 (3.0)E-9 erg cm^-2 s^-1.
The PC spectrum can be fit by a powerlaw with photon index 2.1 +/- 0.1
and an intrinsic absorbing column density of (4.0 +/- 0.8)E22 cm^-2 at
z=3.036, in excess with respect to the Galactic value. The observed
(unabsorbed) flux in the 0.3 - 10 keV band is
5.3 (5.4)E-11 erg cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.
[GCN OPS NOTE(08jun08): Per author's request, the "(4.0 +/- 0.8)E21"
was changed to "(4.0 +/- 0.8)E22".]
GCN Circular 7861
Subject
GRB080607: RTT150 optical observations
Date
2008-06-08T00:23:07Z (17 years ago)
From
Irek Khamitov at TUG <irekk@tug.tug.tubitak.gov.tr>
R. Zhuchkov, I.Bikmaev, N. Sakhibullin (KSU/AST),
I. Khamitov, Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.)
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
report:
We observed the field of optical afterglow (GCN7846) of GRB080607
(GCN 7847, SWIFT trigger=313417) with Russian-Turkish 1.5-m telescope
(RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), starting
at 07 June, 18:35 UT, i.e. ~12.4 hours after the burst, using Andor CCD.
We made a set of 4*300s exposures in BRc bands. We detect nothing at the
position of the OT (GCN7846, GCN7858) on co-added frames with limiting
magnitudes B~22.2 and Rc~22.2
--
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GCN Circular 7862
Subject
Konus-Wind observation of GRB 080607
Date
2008-06-08T15:49:55Z (17 years ago)
From
Valentin Pal'shin at Ioffe Inst <val@mail.ioffe.ru>
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P.
Oleynik, M. Ulanov, D. Svinkin, and
T. Cline on behalf of the Konus-Wind team report:
The bright GRB 080607 (Swift-BAT trigger #313417: Mangano et al., GCN
7847, Stamatikos et al., GCN 7852) triggered Konus-Wind at T0=22043.336
s UT (06:07:23.336).
The burst light curve consists of the main part, which shows a
multipeaked structure with a duration of ~16 s, and the extended
emission, which shows many weak pulses up to ~T0+85 s in the soft energy
band (~18-70 keV).
As observed by Konus-Wind the burst
had a fluence of 8.93(-0.47, +0.52)x10^-5 erg/cm2,
and a 16-ms peak flux measured from T0+7.168 s
of (2.69 +/- 0.54)x10^-5 erg/cm2/s
(both in the 20 keV - 4 MeV energy range).
The time-integrated spectrum of the burst
(from T0 to T0+84.48 s) can be fitted (in the 20 keV - 4 MeV range)
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -1.08(-0.06, +0.07),
and Ep = 419(-38, +46) keV (chi2 = 78.8/73 dof).
Fitting by GRBM (Band) model yields:
the low-energy photon index is alpha = -1.06(-0.08, +0.09),
the high energy photon index beta < -2.28,
the peak energy Ep = 394(-54, +58) keV (chi2 = 77.2/72 dof).
The spectrum of the main part
(from T0 to T0+18.944 s) can be fitted (in the 20 keV - 4 MeV range)
by GRBM (Band) model for which:
the low-energy photon index is alpha = -0.76(-0.06, +0.07),
the high energy photon index beta = -2.57(-0.26, +0.18),
the peak energy Ep = (348 +/- 27) keV (chi2 = 99.6/72 dof).
The fluence of this part is (8.59 +/- 0.40)x10^-5 erg/cm2.
All the quoted errors are at the 90% confidence level.
Assuming z = 3.036 (Prochaska et al., GCN 7849) and a standard
cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.27, Omega_\Lambda =
0.73, the isotropic energy release is E_iso = 1.87(-0.10, +0.11)x10^54
erg, the peak luminosity is (L_iso)_max = (2.27 +/- 0.46)x10^54 erg/s,
and Ep_rest ~1600 keV.
This isotropic energy release is one of the largest ever measured
(the current record holder is GRB 990123 for which the isotropic energy
release is ~2.8x10^54 erg), and this peak luminosity is the highest ever
reported.
The Konus-Wind light curve of this GRB is available
at http://www.ioffe.rssi.ru/LEA/GRBs/GRB080607_T22043/
GCN Circular 7866
Subject
GRB 080607: AGILE-MCAL observation of the prompt emission
Date
2008-06-09T15:44:57Z (17 years ago)
From
Marco Feroci at IASF/INAF <feroci@iasf-roma.inaf.it>
M. Marisaldi, F. Fuschino, M. Galli, C. Labanti, A. Bulgarelli, F.
Gianotti, M. Trifoglio, G. Di Cocco (INAF/IASF Bologna), E. Costa, E. Del
Monte, I. Donnarumma, Y. Evangelista, M. Feroci, I. Lapshov, F.
Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta (INAF/IASF Roma), F.
Fornari, A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A.
Pellizzoni, F. Perotti, M. Fiorini, P. Caraveo (INAF/IASF Milano), M.
Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois
(INAF/IASF Rome), G. Barbiellini, F. Longo, E. Vallazza (INFN Trieste), P.
Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria),
P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, (ASDC) and
L. Salotti (ASI), on behalf of the AGILE Team, report:
"The Swift localized GRB 080607 (Mangano et al., GCN 7847; Stamatikos et
al., GCN 7852) triggered the Mini-Calorimeter (MCAL) instrument onboard
the AGILE satellite at 06:07:23 UT (=T0). The MCAL instrument covers the
energy range 350 keV - 10 MeV, without imaging capabilities.
Using the preliminary in-flight calibration and assuming a Crab-like
spectrum, we can estimate the fluence in the 350-700 keV energy band to be
(23 +/- 7) photons/cm2 corresponding to (1.8 +/- 0.5)x10^-5 erg/cm2, in
the time interval T0-T0+14 s. The 1-s peak flux measured at T0+5.1 s is
(4.2 +/- 1.2) photons/cm2/s in the same energy band. The GRB was detected
also in the 1.4-2.8 MeV energy band with a 10 sigma significance in the
256-ms time window.
We note that the quoted fluence is in agreement within errors with that
obtained using the Konus-Wind spectrum reported in Golenetskii et al., GCN
7862. Assuming the spectral model reported in GCN 7862, an agreement in
flux within 10% for the energy band 350-700 keV is obtained.
The Swift localization is at about 113 degrees off-axis with respect to
the AGILE pointing, so well out of the field of view of the AGILE
Gamma-Ray Imaging Detector (GRID), sensitive in the 50 MeV - 50 GeV energy
range. Analysis of the GRID count rate does not show any detection.
This GRB triggered also SuperAGILE and was detected at about 17 sigma
significance level in the 18-60 keV band, although it was well outside the
field of view, and was detected through the collimator shielding."
This message may be cited.
GCN Circular 7891
Subject
GRB080607: optical observation
Date
2008-06-21T12:16:51Z (17 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB
follow-up collaboration:
We observed the field of Swift GRB 080607 (Mangano et al., GCN 7847) on
June 07 between (UT) 19:54 - 21:05 with Zeiss-1000 (Simeiz) telescope of
CrAO observatory. We detect faint optical source in coordinates
RA(J2000): 12 59 47.24
Dec(J2000): +15 55 08.74
with uncertainties of 0.5".
The source looks extended. The source is within enhanced XRT position
(Osborne et al., GCN 7853), however the source position is apart ~2" from
coordinates reported for the afterglow (Rujopakarn et al., GCN 7846, Mangano
et al., GCN 7847, Chornock et al., GCN 7856).
It is not clear is the source of a putative host galaxy + afterglow or the
source is not related.
A photometry is obtained in comparison with nearby USNOB-1.0 star 12 59
45.62 +15 54 19.10 assuming R=17.91:
T0+ Exposure R_mag UL
(mid)
0.5985 d 35x120 s 22.00 +/- 0.25 22.5
The message may be cited.