GRB 080603B
GCN Circular 7975
Subject
GRB 080603B: optical observations in MAO
Date
2008-07-12T08:57:45Z (18 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
M. Ibrahimov, R. Karimov (MAO), V. Rumyantsev (CrAO), A. Pozanenko (IKI)
report on behalf of larger GRB follow-up collaboration:
We observed the afterglow (Rujopakarn, et al., GCN 7792) of the Swift GRB
080603B (Mangano et al., GCN 7794) on June 04 between (UT) 16:12:24 -
16:34:23 with AZT-22 (Maidanak) telescope of MAO observatory in R-band.
The afterglow is well detected in each individual frame.
A photometry of the two combined images is obtained in comparison with
nearby USNOB-1.0 stars:
T0+ Exposure R_mag
(mid)
0.8571 d 2x300 20.49 +/- 0.07
0.8703 d 3x300 20.71 +/- 0.08
The message may be cited.
GCN Circular 7974
Subject
GRB 080603B: optical observations in CrAO
Date
2008-07-12T08:53:15Z (18 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev, K. Antoniuk (CrAO), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed the afterglow (Rujopakarn, et al., GCN 7792) of the Swift GRB
080603B (Mangano et al., GCN 7794) on June 04 between (UT) 19:49:07 -
20:49:27 with AZT-11 (Nauchny) telescope of CrAO observatory in R-band.
In a combined image we detect the afterglow. A photometry is obtained in
comparison with nearby USNOB-1.0 stars:
T0+ Exposure R_mag UL
(mid)
1.0087 d 19x180 21.30 +/- 0.25 21.8
The message may be cited.
GCN Circular 7890
Subject
GRB 080603b: optical observation
Date
2008-06-21T11:40:18Z (18 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Klunko (ISTP), A. Pozanenko (IKI) on behalf of larger GRB follow up
collaboration report:
We observed afterglow (Rujopakarn, et al., GCN 7792) of Swift GRB 0800603b
(Mangano et al., GCN 7794) with 1.5 m telescope of Sayan observatory
(Mondy) on Jun.04 between (UT) 18:35 - 19:11. The afterglow is detected in a
combined image of 8x120 s exposure. A photometry of the afterglow obtained
against several USNO-A2.0 stars is following:
T0+ Exposure R_mag
(mid)
0.9686 d 8x120 s 21.10 +/- 0.10
This photometry confirms the steep decay of a light curve (alpha ~ 2.5)
suggested by Kann et al. (GCN 7824).
The message may be cited.
GCN Circular 7869
Subject
GRB 080603b: optical observation
Date
2008-06-11T23:29:52Z (18 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 080603b (Mangano et al., GCN 7794) on
June 06 betwen (UT) 19:20:31 - 20:27:07 with Zeiss-1000 (Simeiz) telescope
of CrAO observatory with favorable weather conditions. We do not detect
optical afterglow (Rujopakarn, et al., GCN 7792) in a combined image of
R-band up to 22.5 (3sigma). A photmetry is obtained in comparison with
nearby USNOB-1.0 stars:
UT, Exposure, UL
(mid time)
3.011 d 33x120 s 22.5 (3sigma)
The message may be cited.
GCN Circular 7865
Subject
GRB 080603B - TLS 2nd Epoch: Another Break
Date
2008-06-09T02:33:11Z (18 years ago)
From
Alexander Kann at TLS Tautenburg <kann@tls-tautenburg.de>
D. A. Kann, U. Laux and S. Ertel (TLS Tautenburg) report:
We observed again the field of the Swift GRB 080603B (Mangano et al., GCN
7794) with the TLS 1.34m Schmidt telescope. The observing conditions
changed rapidly, from passing clouds and moonlight to excellent
conditions. We obtained a total of 11 x 600 sec images in the R band. The
first five images were lost due to high background as well as passing
clouds. We stacked the final six images, which have a mid-time of June
8.98085. The afterglow (Rujopakarn, Guver, & Smith, GCN 7792) is not
detected anymore in the stack. Using the same comparison star as Kann et
al. (GCN 7823), we derive a 2 sigma upper limit of R > 23.7 at 5.132644
days after the GRB.
Comparing this value with the one determined at 1.16 days after the GRB by
Kann et al. (GCN 7823) (R = 21.32), we find a decay slope alpha > 1.47.
While this does not allow any assertion on the reality of the steep decay
slope (alpha ~ 2.5) reported by Kann et al. (GCN 7823), it is steeper than
the slope reported (alpha_R=-1.14+/-0.09) by Zhuchkov et al. (GCN 7803)
and confirmed by Xin et al. (GCN 7814), indicating that another break in
the light curve must have occurred, independent of calibration issues. As
the slope reported by Zhuchkov et al. (GCN 7803) is much too shallow to be
a post-jet break slope, this indicates that the second break is very
probably a jet break. The slope reported by Kann et al. (GCN 7823) is in
accordance with a post-jet break slope. This then leads to the interesting
question of the origin of the first break Zhuchkov et al. detected, as it
is much to strong to be a cooling break (Delta alpha_R = 0.55 versus the
theoretical value of Delta alpha = 0.25 for a cooling break).
This message may be cited.
GCN Circular 7840
Subject
GRB 080603B: VLA radio upper limit
Date
2008-06-06T17:38:37Z (18 years ago)
From
Poonam Chandra at U Virginia/NRAO <pc8s@virginia.edu>
Poonam Chandra (NRAO/UVA) and Dale A. Frail (NRAO) report on
behalf of the Caltech-NRAO-Carnegie GRB Collaboration:
"We used the Very Large Array to observe the field of view toward GRB
080603B (GCN 7794) at a frequency of 8.46 GHz on 2008 June 05.16 UT.
The GRB radio afterglow is undetected and the peak radio flux at the
SWIFT-UVOT position (GCN 7794) is 11 � 41 uJy.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities, Inc."
GCN Circular 7827
Subject
GRB 080603B: PAIRITEL infrared detection
Date
2008-06-05T22:02:59Z (18 years ago)
From
Daniel Perley at U.C. Berkeley <dperley@astro.berkeley.edu>
A. A. Miller, J. S. Bloom, and D. A. Perley (UC Berkeley) report:
We observed the optical afterglow of GRB080603B (Mangano et al., GCN
7794) with the 1.3m Peters Automated Infrared Imaging Telescope
(PAIRITEL) starting 7.66 hours post trigger on June 04, 2008 UT. We
detected the afterglow in a 2291 sec mosiac of 7.8 sec simultaneous
exposures in the J, H, and Ks filters. Preliminary photometry for the
afterglow in exposures beginning on Jun 04.14 UT yields J = 17.9 +- 0.1,
H = 17.2 +- 0.1, and Ks = 16.7 +- 0.15, calibrated to the 2MASS system.
GCN Circular 7823
Subject
GRB 080603B: TLS Afterglow Observation
Date
2008-06-05T15:24:14Z (18 years ago)
From
Alexander Kann at TLS Tautenburg <kann@tls-tautenburg.de>
D. A. Kann, U. Laux and S. Ertel (TLS Tautenburg) report:
We observed the field of the Swift GRB 080603B (Mangano et al., GCN 7794)
with the TLS 1.34m Schmidt telescope in mediocre observing conditions (low
airmass but high humidity and moderate transparency). We obtained a total
of 6 x 600 sec images at mid-time June 4.980179. The afterglow
(Rujopakarn, Guver, & Smith, GCN 7792) is faintly visible in each image.
We stacked all six images. Assuming the USNOB1.0 star with ID 1580-0163070
at RA = 11:46:29.297, Dec. +68:03:23.43 (USNOB1.0 catalog value) to have
R1 = 17.97 mag, we measure for the afterglow:
dt Rc dRc
1.16197 21.32 0.04 (statistical only)
In comparison to the magnitude measured by Xin et al. (GCN 7814) 0.8 days
after the GRB, this implies a steep decay of alpha ~ 2.5. It is unclear if
this is due to a break or to the use of different comparison stars. The
comparison star used by Zhuchkov et al. GCN 7803, and Xin et al., GCN
7814, is saturated in our images. Further observations are warranted.
This message may be cited.
GCN Circular 7815
Subject
GRB 080603B: Hobby-Eberly Telescope redshift confirmation
Date
2008-06-04T17:51:00Z (18 years ago)
From
Antonino Cucchiara at PSU <cucchiara@astro.psu.edu>
A. Cucchiara and D. B. Fox (Penn State) report:
"Starting on 2008 June 4.13 UT we used the Marcario LRS spectrograph
on the Hobby-Eberly Telescope (R ~ 230) to obtain 2 x 900s spectra
of the optical afterglow of GRB 080603B (GCN 7792, GCN 7794).
The spectrum covers the wavelength range 4500 to 10,000 Angstrom.
We clearly detect the Lyman break and several metal absorption features
corresponding to a redshift z = 2.69.
No other systems are detected and our result confirms the redshift
determination by Fynbo et al. (GCN 7797).
We thank the HET staff for performing this challenging observation,
in particular Matthew Shetrone."
GCN Circular 7814
Subject
GRB 080603B : Xinglong EST observations
Date
2008-06-04T17:43:05Z (18 years ago)
From
W.K. Zheng at NAOC <zwk@bao.ac.cn>
L.P.Xin, Q.C.Feng, M.Zhai, Y.L.Qiu, J.Y.Wei, J.Y.Hu, J.S.Deng,
J.Wang, Y.Urata and W.K.Zheng on behalf of EAFON report:
Xinglong EST started to observe the GRB080603B (Mangano et al.,
GCN 7794) from 14:42 UT Jun 04 with R and V filters. with the
same calibration star as used in GCN7803 (Zhuchkov et al.)
USNO-A2 1575-03195804 R=13.8 mag, we estimated the brightness
of OT R ~ 20.3 +/- 0.15, which is consistent with the powler
decay after the break given it GCN7803. Observation is still
under going.
This message may be cited
For more information about Xinglong GRBs Follow-up
observations, please visit the website:
http://www.xinglong-naoc.org/grb/
GCN Circular 7813
Subject
GRB 080603B : Liverpool Telescope Observations
Date
2008-06-04T17:13:50Z (18 years ago)
From
Andrea Melandri at Liverpool John Moores U <axm@astro.livjm.ac.uk>
A. Melandri, (Liverpool JMU), A. Gomboc (U. Ljubljana), C. Guidorzi
(INAF-OAB), R.J. Smith, I.A. Steele, D. Bersier, C.G. Mundell, D. Carter,
S. Kobayashi, M. Burgdorf, M. Bode (Liverpool JMU), E. Rol, P. O'Brien,
N. Bannister, N. Tanvir (U. Leicester) report:
On 2008 Jun 03 at 21:32:57UT we observed the Swift GRB 080603B
(trigger=313087, Mangano et al., GCN 7794) with the Liverpool Telescope
using SDSS-I, SDDS-R and Bessell-B filters.
The OT reported by Rujopakarn et al. (GCN 7792), Mangano et al. (GCN
7794), Klotz et al. (GCN 7795, 7799), Castro-Tirado et al. (GCN 7796)
and Zhuchkov et al.(GCN 7803) is well detected in all our single 300s
exposures.
We calibrated the afterglow magnitude using B, R and I magnitudes of few
USNO B1 stars in the field of view.
Our observations started soon after the plateau phase reported by Klotz et
al. (GCN 7795) and Castro-Tirado et al. (GCN 7796) but our I-band and
R-band images were acquired before and after the optical break reported by
Zhuchkov et al.(GCN 7803).
We found alpha_I= 0.55 +/- 0.03 before the optical break and
alpha_R= 1.03 +/- 0.02 after the break, confirming the values found by
Zhuchkov et al.(GCN 7803).
GCN Circular 7812
Subject
Konus-Wind observation of GRB 080603B
Date
2008-06-04T17:04:26Z (18 years ago)
From
Valentin Pal'shin at Ioffe Inst <val@mail.ioffe.ru>
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks,
and T. Cline on behalf of the Konus-Wind team report:
The long GRB 080603B (Swift-BAT trigger #313087: Mangano et al., GCN
7794, Tueller et al., GCN 7806) triggered Konus-Wind at T0=70692.383 s
UT (19:38:12.383).
The burst light curve shows several pulses with a total duration of ~70s.
As observed by Konus-Wind the burst
had a fluence of 4.50(-0.90, +1.53)x10^-6 erg/cm2,
and a 256-ms peak flux measured from T0+0.624 s
of 1.51(-0.38, +0.40)x10^-6 erg/cm2/s
(both in the 20 keV - 1 MeV energy range).
The time-integrated spectrum of the burst
(from T0 to T0+73.984 s) can be fitted (in the 20-500 keV range)
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -1.23(-0.54, +0.75),
and Ep = 102(-28, +119) keV (chi2 = 50.5/42 dof).
Fitting by GRBM (Band) model yields:
the low-energy photon index is alpha = -0.94(-0.75, +1.21),
the high energy photon index beta < -1.96,
the peak energy Ep = 85(-30, +91) keV (chi2 = 49.7/41 dof).
The spectrum of the most intense part (from T0 T0+16.640 s)
is well fitted (in the 20 keV - 1 MeV range)
by a power law with exponential cutoff model
with alpha = -1.20(-0.32, +0.26)
and Ep = 200(-56, +131) keV (chi2 = 63.5/56 dof).
The fluence of this part is 3.51(-0.58, +0.69)x10^-6 erg/cm2.
All the quoted errors are at the 90% confidence level.
Assuming z = 2.69 (Fynbo et al., GCN 7797) 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 ~7.7x10^52 erg,
the maximum luminosity is (L_iso)_max ~9.4x10^52 erg/s, and
Ep_rest ~350 keV.
The Konus-Wind light curve of this GRB is available
at http://www.ioffe.rssi.ru/LEA/GRBs/GRB080603_T70692/
GCN Circular 7811
Subject
GRB 080603B: Swift-XRT refined analysis
Date
2008-06-04T16:37:24Z (18 years ago)
From
Boris Sbarufatti at INAF-IASF-Pa <sbarufatti@ifc.inaf.it>
V. Mangano, V. La Parola, B. Sbarufatti (INAF-IASF PA) report on behalf
of the Swift-XRT team:
The Swift-XRT observed GRB 080603B (trigger 313087, Mangano et
al. GCN Circ 7794) for three orbits which consisted of 200 s of
Windowed Timing mode data starting 68 s after the trigger and
990 s of Photon Counting mode data, 274 s after the trigger.
We obtained a refined XRT position at
RA, Dec = 176.53312 68.06058 which is equivalent to:
RA (J2000): 11 46 07.95
Dec (J2000): 68 03 38.11
with an uncertainty of 3.7 arcsec (radius, 90% confidence).
The position is 3.2 arcsec from the on-board position reported
in GCN Circ. 7794 and 0.7 arcsec from the refined UVOT position
(Kuin et al. GCN Circ 7808).
The X-ray light curve shows an initial steep decay with a slope
of 3.4 � 0.1, breaking to a shallower decay of 0.8 � 0.1 at
a time of 161 � 6 s after the trigger.
A spectrum of the Windowed Timing data can be well fit by an absorbed
power-law, with a photon index Gamma = 1.68 � 0.06 and a column
density Nh = (7.9 � 0.2) e21 cm-2 in excess with respect to the Galactic
column density in this direction of 1.2e20 cm-2. The observed
(unabsorbed) 0.3-10 keV flux is 7.0e-10 (7.7e-10) erg cm-2 s-1.
The Photon Counting mode spectrum is also well fit by an absorbed
powerlaw, with an Nh = (1.3 � 0.2) e22 cm-2 and Gamma = 2.0 � 0.2.
The observed (unabsorbed) 0.3-10 keV flux is 1.55 e-11 (1.91e-11)
erg cm-2 s-1.
The predicted XRT count rate after 24 hours from burst is 6.0e-2 counts/s
This circular is an official product of the Swift-XRT team.
GCN Circular 7808
Subject
GRB 080603B: Swift/UVOT detection of the afterglow
Date
2008-06-04T13:57:29Z (18 years ago)
From
Paul Kuin at MSSL <npkuin@googlemail.com>
N. P. M. Kuin (MSSL/UCL), and V. Mangano (INAF-IASFPA), report on behalf
of the Swift UVOT team
The Swift UltraViolet/Optical Telescope (UVOT) began observations
of GRB 080603A, on June 3, 2008, at 19:39:07 UT, 63 seconds after
the initial Swift BAT trigger (Mangano et al., GCN Circ. 7794)..
The refined uvot position is
RA = 11:46:07.66 = 176.5316
DEC =+68:03:39.99 = 68.061105
with an error or 0.3".
The first finding chart in the wh filter has problems due to the
brightness of the image, and needs detailed analysis. We start
our report with the second finding chart.
The magnitudes with 1-sigma errors for GRB080603B are given below
for the initial observation sequence.
Filter Tstart(s) Tstop(s) Exp(s) Magnitude
v 187.8 393.1 202 16.48 +/- 0.06
uvm2 5778.0 5977.8 197 > 19.51 (3-sigma UL)
uvw1 5983.9 6183.7 197 20.02 +/- 0.56
u 6188.8 6388.6 197 18.80 +/- 0.23
b 6395.3 12274.3 643 19.34 +/- 0.14
The absence of a detection in the uvm2 filter is consitent with
the reported redshift of 2.69 (Fynbo et al., GCN Circ. 7797).
Magnitude variation in the b observations shor evidence
of flaring or rebrightening..
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) = 0.013 in the direction of
the burst (Schlegel et al. 1998).
GCN Circular 7806
Subject
GRB 080603B, Swift-BAT refined analysis
Date
2008-06-04T12:32:40Z (18 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
J. Tueller (GSFC), 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), A. M. Parsons (GSFC),
T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU),
T. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+470 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 080603B (trigger #313087)
(Mongano, et al., GCN Circ. 7794). The BAT ground-calculated position is
RA, Dec = 176.554, 68.061 deg, which is
RA(J2000) = 11h 46m 13.0s
Dec(J2000) = +68d 03' 40.5"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
The mask-weighted light curve shows three main clusters of peaks. The first
starts at T-1 sec, peaks at T+1 sec, and ends at ~T+7 sec. The second
starts at T+8 sec and ends at T+20 sec. The third starts at ~T+42 sec
and ends at ~T+80 sec. T90 (15-350 keV) is 60 +- 4 sec (estimated error
including systematics).
The time-averaged spectrum from T-0.1 to T+68.6 sec is best fit by a power law
with an exponential cutoff. This fit gives a photon index 1.21 +- 0.30,
and Epeak of 71.0 +- 16.0 keV (chi squared 63.16 for 56 d.o.f.). For this
model the total fluence in the 15-150 keV band is 2.4 +- 0.1 x 10^-6 erg/cm2
and the 1-sec peak flux measured from T+0.96 sec in the 15-150 keV band is
3.5 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index
of 1.78 +- 0.07 (chi squared 75.18 for 57 d.o.f.). 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/313087/BA/
GCN Circular 7803
Subject
GRB080603B: RTT150 optical observations, break in light curves
Date
2008-06-04T09:46:50Z (18 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:
The optical counterpart (GCN7792, 7793, 7794, 7795, 7796, 7797, 7799)
of GRB 080603B (GCN 7794, SWIFT trigger=313087) was observed with
Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK
National Observatory, Turkey), starting at 03 June, 20:55 UT,
i.e. ~1.3 hours after the burst, using Andor CCD.
A series of 70 frames with 60sec exposure in the R and V bands were taken
for a time span ~ 4.5 hours. The afterglow is clearly detected in all
images. Using RTT150 preliminary calibrated magnitudes for USNO-A2
1575-03195804 star R.A. = 11 46 09.53, Dec. = +68 01 51.3, V=14.2,
R=13.8 mag, the brightness of the OT was estimated on each frame.
V,R light curves are shown at:
http://www.tug.tubitak.gov.tr/~irekk/grb/grb080603B/GRB080603B_lc.jpg
Higher dispersion at (T-T0) > 4 hours must be due to high airmass
( Z ~ 65-70 degrees).
The VR-light curves are well fitted with two power law decay functions
with a break about 3 hours after the burst.
A power law decay indices were estimated in OT VR-light curves as follow:
before the break
alpha_R=-0.59+/-0.03
alpha_V=-0.60+/-0.03
after the break
alpha_R=-1.14+/-0.09
alpha_V=-1.03+/-0.07
The alpha indices before the break are in good agreement with Klotz et al.
(GCN7799) calculated for the time span between 1 and 4 hours after
the burst.
--
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GCN Circular 7799
Subject
GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
Date
2008-06-04T00:41:39Z (18 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 080603B from
68 min to 240 min after the trigger with TAROT.
The light curve displays a slow optical
decay compatible with alpha=0.62 +/- 0.1.
R~18.2 at t0+225 min.
GCN Circular 7797
Subject
GRB080603B: NOT redshift
Date
2008-06-03T23:00:16Z (18 years ago)
From
Johan U. Fynbo at U.Copenhagen <jfynbo@astro.ku.dk>
Johan Fynbo (DARK/NBI), Pierre-Olivier Quirion (Univ. Aarhus), Dong Xu,
Daniele Malesani, C. C. Thoene, J. Hjorth, B. Milvang-Jensen (DARK/NBI),
and Pall Jakobsson (Univ. Hertfordshire) report on behalf of a larger
collaboration:
We observed the field of GRB 080603B (Mangano et al., GCN 7794) with the
NOT telescope. We obtained R-band imaging and a low resolution
spectrum using the AlFOSC instrument. Based on the detection of
Lyman-alpha and a number of relatively strong metal lines we infer a
redshift of 2.69.
[GCN OPS NOTE(04jun08): Per author's request, a "B" was added in the Subject.
And Dong Xu was added to the author list.]
GCN Circular 7796
Subject
GRB 080603B: BOOTES2/TELMA optical observations
Date
2008-06-03T22:44:26Z (18 years ago)
From
Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>
A. J. Castro-Tirado, M. Jelinek, J. Gorosabel (IAA-CSIC Granada), P.
Kub�nek (GACE, U. Valencia), S. Vitek (CVUT Praha), A. de Ugarte Postigo
(ESO Santiago), R. Cunniffe (Cork Univ.), R. Fern�ndez-Mu�oz (EELM-CSIC
La Mayora), P. Mart�n-Almendros (Fundaci�n M�laga) and L. Sabau-Graziati
(INTA Madrid), report:
"We are observing the field of GRB 080603B (Mangano et al. GCN 7794)
with the recently installed 60cm robotic telescope BOOTES-2/TELMA in
M�laga (south Spain). The first observations (120s each, with the
r'-band filter) were obtained starting at 20:31 UT (i.e. 51 min after
the onset of the event). We detect the optical afterglow (Rujopakarn et
al. GCN 7792, Mangano et al.) with 17.3 mag, based on a preliminary
calibration using USNO-A2.0. We also confirm the early plateau phase
reported by Klotz et al.(GCNC 7795). From our last frame taken at 22:30
UT we derive a 0.3 mag decay. Further images (in g'r'i'Z filters) are
on their way. Spectroscopic observations are encouraged."
This message can be quoted.
GCN Circular 7795
Subject
GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
Date
2008-06-03T21:54:31Z (18 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 080603 detected by SWIFT
(trigger 313087) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.
The observations started 62 min after the GRB trigger
(burst occured at the sunset). The elevation of the field
decreased from from 63 degrees above horizon and weather
conditions were good.
We detected the candidate couterpart mentioned by
Rujopakarn et al. (GCNC 7792). We note that the afterglow
stays at about the same magnitude between 68 to 109
minutes. Magnitudes derived from two R filtered images are:
t0+68 min to t0+ 71 min R=17.4
t0+106 min to t0+109 min R=17.5
The afterglow seems to exhibit a plateau phase
in its optical light curve. We continue the follow-up.
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
This message may be cited.
GCN Circular 7794
Subject
GRB 080603B: Swift detection of a burst with optical afterglow
Date
2008-06-03T19:59:18Z (18 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
V. Mangano (INAF-IASFPA), S. D. Barthelmy (GSFC),
A. P. Beardmore (U Leicester), P. J. Brown (PSU),
G. Cusumano (INAF-IASFPA), N. Gehrels (NASA/GSFC),
C. Guidorzi (INAF-OAB), S. T. Holland (CRESST/USRA/GSFC),
J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA),
N. P. M. Kuin (MSSL), C. B. Markwardt (CRESST/GSFC/UMD),
F. E. Marshall (NASA/GSFC), K. M. McLean (GSFC/UMD),
P. T. O'Brien (U Leicester), C. Pagani (PSU), D. M. Palmer (LANL),
A. M. Parsons (GSFC), J. L. Racusin (PSU), T. Sakamoto (NASA/UMBC),
B. Sbarufatti (INAF-IASFPA), M. Stamatikos (NASA/ORAU),
T. N. Ukwatta (GSFC/GWU), D. E. Vanden Berk (PSU) and
H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:
At 19:38:13 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 080603B (trigger=313087). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 176.528, +68.076 which is
RA(J2000) = 11h 46m 07s
Dec(J2000) = +68d 04' 33"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows three main peaks
with a duration of about 70 sec. The peak count rate
was ~8000 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 19:39:55 UT. XRT found a bright,
uncatalogued X-ray source located at:
RA(J2000) = 11h 46m 07.7s
Dec(J2000) = +68d 03' 35.2"
with an uncertainty of 4.7 arcseconds (radius, 90% containment).
UVOT took a finding chart exposure of nominal 100 seconds with the White
(160-650 nm) filter starting 72 seconds after the BAT trigger. There is a
candidate afterglow in the list of sources generated on-board at
RA(J2000) = 11:46:07.70 = 176.5321
DEC(J2000) = +68:03:40.0 = 68.0611
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 15.9 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 0.01.
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 7792
Subject
GRB 080603B: ROTSE-III Detection of Optical Counterpart
Date
2008-06-03T19:55:01Z (18 years ago)
From
Wiphu Rujopakarn at U AZ/Steward <wiphu@as.arizona.edu>
W. Rujopakarn (Steward), T. Guver (U Arizona), D.A. Smith (Guilford),
report on behalf of the ROTSE collaboration:
ROTSE-IIId, located at the Turkish National Observatory at Bakirlitepe,
Turkey, responded to GRB 080603B (Swift trigger 313087). The first image
was at 19:38:36.2 UT, 22.9 s after the burst (8.3 s after the GCN notice
time). The unfiltered images are calibrated relative to USNO A2.0. We
detect a new, rapidly fading object, not visible in the DSS (second
epoch), with coordinates:
11:46:07.8 +68:03:39.9 (J2000), with positional uncertainty
of 1" or better
start UT mag mlim(of image)
----------------------------------
19:38:36.2 14.1 14.9
A jpeg image is available at
http://www.rotse.net/images/gsb313087_3d00_img.jpg (OT circled in yellow
and blue)
[GCN OPS NOTE(03jun08): Per author's request, the "B" was added to the
GRB name.]