- GCN/BACODINE POSITION NOTICE
TITLE: GCN/INTEGRAL NOTICE
NOTICE_DATE: Tue 03 Jun 08 11:18:45 UT
NOTICE_TYPE: INTEGRAL Wakeup
TRIGGER_NUM: 5283, Sub_Num: 0
GRB_RA: 279.3784d {+18h 37m 31s} (J2000),
279.3965d {+18h 37m 35s} (current),
279.2703d {+18h 37m 05s} (1950)
GRB_DEC: +62.7313d {+62d 43' 53"} (J2000),
+62.7389d {+62d 44' 20"} (current),
+62.6861d {+62d 41' 10"} (1950)
GRB_ERROR: 3.18 [arcmin, radius, statistical only]
GRB_INTEN: 8.76 [sigma]
GRB_TIME: 40712.09 SOD {11:18:32.09} UT
GRB_DATE: 14620 TJD; 155 DOY; 08/06/03
SC_RA: 274.06 [deg] (J2000)
SC_DEC: 64.65 [deg] (J2000)
SUN_POSTN: 71.84d {+04h 47m 21s} +22.39d {+22d 23' 15"}
SUN_DIST: 92.11 [deg] Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN: 65.91d {+04h 23m 39s} +26.42d {+26d 25' 04"}
MOON_DIST: 86.94 [deg]
GAL_COORDS: 92.50, 25.47 [deg] galactic lon,lat of the burst
ECL_COORDS: 320.67, 84.46 [deg] ecliptic lon,lat of the burst
COMMENTS: INTEGRAL GRB Coordinates.
COMMENTS: Possibly real GRB event
- red DSS finding chart
ps-file
- GCN Circular #7788
A. Gomboc (U. Ljubljana), I.A. Steele (Liverpool JMU), E. Rol, P. O'Brien
(U. Leicester), A, Melandri, D. Bersier, C.G. Mundell, R.J. Smith, D.
Carter, S.
Kobayashi, M. Burgdorf, M. Bode (Liverpool JMU), C. Guidorzi (INAF-OAB),
N. Bannister, N. Tanvir
(U. Leicester) report:
The 2-m Faulkes Telescope North (Hawaii) automatically reacted to the
INTEGRAL trigger 5283 and possible GRB 080603 and started observing the
field at 1.3 min after the trigger.
We detect an optical afterglow candidate at:
RA 18:37:38.1,
dec +62:44:39.4.
We estimate the magnitude of the source (calibrated to USNO-B1.0
catalogue) to be I=20.3+-0.3 at t_0+5.93 min and R=19.6+-0.3 at t_0+7.37 min.
- GCN Circular #7789
R. Chornock, D. Perley, W. Li, and A. V. Filippenko (UC Berkeley) report that:
The Katzman Automatic Imaging Telescope (KAIT) at Lick Observatory slewed to the
position of GRB 080603 and detected a new source not present in the DSS at
coordinates:
(J2000) 18:37:38.06 +62:44:39.3
The new source was first detected in a 60s image starting at 11:28:55 UT and is
near magnitude 18.7 in unfiltered and I band images.
- GCN NOTICE
TITLE: GCN/INTEGRAL NOTICE
NOTICE_DATE: Tue 03 Jun 08 12:34:21 UT
NOTICE_TYPE: INTEGRAL Offline
TRIGGER_NUM: 5283, Sub_Num: 1
GRB_RA: 279.4089d {+18h 37m 38s} (J2000),
279.4270d {+18h 37m 42s} (current),
279.3009d {+18h 37m 12s} (1950)
GRB_DEC: +62.7348d {+62d 44' 05"} (J2000),
+62.7425d {+62d 44' 33"} (current),
+62.6896d {+62d 41' 22"} (1950)
GRB_ERROR: 2.00 [arcmin, radius, statistical only]
GRB_INTEN: 8.76 [sigma]
GRB_TIME: 40712.09 SOD {11:18:32.09} UT
GRB_DATE: 14620 TJD; 155 DOY; 08/06/03
SC_RA: 274.06 [deg] (J2000)
SC_DEC: 64.65 [deg] (J2000)
SUN_POSTN: 71.89d {+04h 47m 34s} +22.39d {+22d 23' 37"}
SUN_DIST: 92.11 [deg] Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN: 66.80d {+04h 27m 11s} +26.53d {+26d 31' 31"}
MOON_DIST: 87.02 [deg]
GAL_COORDS: 92.50, 25.46 [deg] galactic lon,lat of the burst
ECL_COORDS: 320.80, 84.45 [deg] ecliptic lon,lat of the burst
COMMENTS: INTEGRAL GRB Coordinates.
COMMENTS: refined_coordinates_after_offline_analysis
- GCN Circular #7790
A.Paizis, S.Mereghetti (IASF-Milano), D.Gotz (CEA-Saclay), M. Turler,
V.Beckmann, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on
behalf of the IBAS Localization Team report:
A GRB lasting about 180 s has been detected by IBAS in IBIS/ISGRI data at
11:18:11 UT of June 3. The coordinates (J2000) are:
RA: 279.409 [degrees]
DEC: +62.735 [degrees]
with an uncertainty of 2 arcmin (90% c.l.).
A preliminary analysis gives a peak flux in the 20-200 keV range of about
0.5 ph/cmq/s (1-s integration time) and a fluence over the same energy
range of about 10e-6 erg/cmq.
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
This message can be cited.
- GCN Circular #7791
D. A. Perley, J. S. Bloom (UC Berkeley), and J. X. Prochaska (UCO/Lick)
report on behalf of a larger collaboration:
Following the KAIT detection (Chornock et al., GCN 7789) of the
afterglow candidate of GRB 080603 (Paizis et al., GCN 7790; Gomboc et
al., GCN 7788) we began a spectroscopic sequence at Gemini-North using
GMOS. We acquired 2x1200s longslit exposures starting at UT 13:24. We
detect very strong resonance lines of MgII and FeII and the
fine-structure transitions of FeII which establish the redshift of the
GRB to be z=1.6880. In addition, we identify intervening MgII
absorption systems at z=1.5635 (90% c.l.) and z=1.271 (100% c.l.)
In addition, in a single acquisition exposure starting at UT 13:05:05
(107 minutes after the trigger) the object has a magnitude (relative to
USNO B1.0) of R~19.7, suggesting it has not faded significantly since
the observations of Gomboc et al. (GCN 7788).
We thank Richard McDermid and the Gemini staff and for support.
- GCN Circular #7793
P.A. Milne (U Arizona) and A. Updike (Clemson U) report on behalf of the
Super-LOTIS team:
The 0.6m Super-LOTIS telescope began R-band observations of the error
region of GRB080603 at 11:19:04 UT. The OT detected by Gomboc et al.
(GCN 7788) and Chornock et al. (GCN 7789) is not
apparent in the initial images, but is clearly visible in
subsequent images. Using a stack of 10 x 60sec images obtained between
11:22:44 -> 11:33:46, we estimate the magnitude of the source to be
R=19.3 +/- 0.3.
We used the USNO-B star at RA=18:37:55, Dec=+62:44:32 to derive the
R2 magnitude.
Analysis continues to better characterize the rise of the emission from
the OT.
This message can be cited.
- GCN Circular #7804
N. P. M. Kuin (MSSL/UCL), and V. Mangano (INAF), report on behalf
of the Swift UVOT team
The Swift UltraViolet/Optical Telescope (UVOT) began observations of INTEGRAL
burst GRB080603A (INTEGRAL trigger number 5283, Paizis et al., GCN Circ. 7790),
on June 3, 2008, at 14:11:20 UT, 173 minutes after the initial trigger in
the UVOT v filter.
We detect a fading source at position :
RA=18:37:38.21 Dec=+62:44:38.40 (279.40921 +62.74400 ddeg (J2000)).
The initial magnitude observed for GRB080603A is given below for the
first observation in the UVOT v filters:
Filter Tstart(s) Tstop(s) Exp(s) Magnitude
v 10389 10499 109. 19.16 +/- 0.35
The magnitude decrease observed was 1.2 magnitudes per hour.
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) = 0.044 in the direction of
the burst (Schlegel et al. 1998).
- GCN Circular #7810
B. Sbarufatti, V. Mangano, V. La Parola (INAF-IASF Pa) report on behalf
of the Swift-XRT team
The Swift XRT began observations of the INTEGRAL burst GRB 080603A
(Paizis et al., GCN Circ 7790) on June 3, 14:11 UT, 173 minutes after
the trigger. The data consist of 3.9 ks observed in Photon Counting
mode.
We detect an X-ray counterpart at position (astrometrically corrected0
using the XRT-UVOT alignment and matching UVOT field sources to the
USNO-B1 catalogue): RA, Dec =3D 279.40858, 62.74446 which is equivalent to:
RA (J2000): 18 37 38.06
Dec (J2000): +62 44 40.1
with an uncertainty of 1.9 arcsec (radius, 90% confidence).
The light curve is dominated by a flare-like structure which covers all
the observed time interval, making it impossible to estimate the
behaviour of the underlying continuum and to predict the evolution of
the source.
The spectrum can be fitted with a powerlaw with an intrinsic absorbing
column of (8+/-5)e21 cm-2 at z=3D1.688 (Perley et al., GCN Circ 7791)
and photon index 2.4 =B10.3. The observed (unabsorbed) 0.3-10 keV flux
is 3.23 (3.57)e-12 erg cm-2 s-1.
This circular is an official product of the Swift-XRT team.
- GCN Circular #7822
D. A. Kann, U. Laux and S. Ertel (TLS Tautenburg) report:
We observed the field of the INTEGRAL GRB 080603A (Paizis et al., GCN
7790) 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 5.023368. The
afterglow (Gomboc et al., GCN 7788; Chornock et al., GCN 7789) is faintly
visible in each image. We stacked all six images. Assuming the USNOB1.0
star with ID 1527-0313986 at RA = 18:37:55.186, Dec. +62:45:32.28 to have
R1 = 16.74 mag, we measure for the afterglow:
dt Rc dRc
1.55241 21.39 0.03 (statistical only)
We note the presence of a fainter source several arcseconds east of the OT
which may slightly influence the photometry.
In comparison to the magnitude measured by Perley et al. (GCN 7791), this
implies a slow decay of alpha ~ 0.5. Further observations are warranted.
This message may be cited.
- GCN Circular #7824
X.M. Meng, Y.N. Zhu, 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:
We observed GRB080603A (Paizis et al., GCN 7790), with
Xinglong 2.16m telescope + BFOSC on Jun 4, 1.321 Days
after the burst. We marginally detected the OT (Gomboc et al.,
GCN 7788; Chornock et al., GCN 7789; Kuin et al., GCN 7804
Kann et al. GCN 7822) at 3 sigma level. With the same
calibration star as used in GCN 7822 (Kann et al.) USNOB1.0
1527-0313986 at RA = 18:37:55.186, Dec. +62:45:32.28
R1 = 16.74, we estimated the OT brightness was R ~ 21.3
+/- 0.3. We also detected the faint star at east side of OT
noted by Kann et al.
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 #7826
A. A. Miller, J. S. Bloom, and D. A. Perley (UC Berkeley) report:
We observed the optical afterglow of GRB080603A (Paizis et al., GCN
7790; Gomboc et al., GCN 7788; Chornock et al; GCN 7789) with the 1.3m
Peters Automated Infrared Imaging Telescope (PAIRITEL) starting 18.89
hours post trigger on June 04, 2008 UT. We detected the afterglow in a
2927 sec mosaic of simultaneous 7.8 sec exposures in the J, H, and Ks
filters. Preliminary photometry for the afterglow in exposures beginning
on Jun 04.26 UT yields J = 18.9 +- 0.15, H = 17.9+- 0.15, and Ks = 16.8
+- 0.15, calibrated to the 2MASS system.
- GCN Circular #7843
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 INTEGRAL
GRB 080603A (GCN 7790) at a frequency of 8.46 GHz on 2008 June 05.39 UT.
We detect a possible radio afterglow at KAIT optical afterglow position
(GCN 7789) at a flux density level of 116 +/- 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 #7855
Poonam Chandra (NRAO/UVA) and Dale A. Frail (NRAO) report on behalf of=20
the Caltech-NRAO-Carnegie GRB Collaboration:
"We used the Very Large Array to re-observe the field of view toward=20
INTEGRAL GRB 080603A (GCN 7790) at a frequency of 8.46 GHz on 2008 June=20
07.42 UT. We clearly detect a radio afterglow at KAIT optical afterglow=20
position (GCN 7789) at a flux density level of 154 =B1 28 uJy.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities, Inc."
- GCN Circular #7860
V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB
follow-up collaboration:
We observed a field of INTEGRAL GRB 080603A (Paizis et al., GCN 7790) in
R-band on June 06 between (UT) 22:32 - 23:55 with Zeiss-1000 (Simeiz)
telescope of CrAO observatory. Extended object is found ~1" south from the
position of optical afterglow (Gomboc et al., GCN 7788; Chornock et al.,
GCN 7789), and the position of the extended object is consistent with
coordinates reported by Kuin et al. (GCN 7804). Therefore, we suggest it as
a host galaxy of 080603A.
Based on USNOB1.0 star with ID 1527-0313986 at RA = 18:37:55.186, Dec.
+62:45:32.28 (R1 = 16.74) we estimated brightness of the extended object:
UT, Exposure, R_mag, UL
(mid time)
3.496 41x120 21.90 +/- 0.17 22.85
If the extended source is the host galaxy then contamination by the host can
explain slow decay of light curve noted by Kann et al. (GCN 7822).
A combined image can be found at
http://grb.rssi.ru/GRB080603A/GRB080603A_2080606.gif
The message may be cited.
- GCN Circular #7860
B. Sbarufatti, V. Mangano, V. La Parola (INAF-IASF Pa) report
on behalf of the Swift-XRT team.
Swift-XRT continued observing the afterglow of the INTEGRAL-detected
GRB 080603A. After the first detection of the X-ray afterglow, showing
flare like activity previously reported (Sbarufatti et al., GCN Circ.
7810) Swift detected the source also at T+234 ks, with count-rate
(8+/-2)E-3 counts/s (2.6 ks exposure) and at T+578 ks, with count-rate
(2.5+/-0.8)E-3 counts/s (6.9 ks exposure). Extrapolation from these two
points gives a power-law decay index of 1.3 +/- 0.4 (1-sigma CL) for
the afterglow.
This Circular is an official product of the Swift-XRT team.
- GCN Circular #7870
D. A. Perley, J. S. Bloom, A. A. Miller, J. Shiode, J. Brewer, D. Starr,
and R. Kennedy (UC Berkeley) report:
On the night of 2008-06-07 (UT) we re-observed the location of GRB
080603A (GCN 7790, Paizis et al.) with Keck I / LRIS in g and R filters
for 785s and 690s respectively, starting at 12:30 UT. The optical
afterglow (Gomboc et al., GCN 7788; Chornock et al., GCN 7789) is
well-detected as the northern member of a complex of sources.
Calibrating relative to four nearby USNO B1.0 stars we estimate an
afterglow magnitude of
R = 23.7 +/- 0.1 (t = 4.05 days)
The extended source reported by Rymyantsev et al. (GCN 7860) is clearly
detected and is well-resolved into the afterglow plus two extended
sources in the g-band frame, with the southern source significantly
redder than the afterglow and the faint western source.
A color image of the field is posted to:
http://lyra.berkeley.edu/~dperley/080603a/080603a_color.png
Given the very strong absorption lines reported in our spectroscopic
observations (Perley et al., GCN 7791), this complex may be a bright
host galaxy of this burst, as suggested by Rumyantsev et al. However,
the sources above are offset significantly from the afterglow (which
itself is not obviously extended), suggesting instead that they may
represent one or both of the intervening absorbers.
Later the same night, we acquired 2x900s spectra using a slit covering
the northern (afterglow) source and southern source, and an additional
1x600 spectrum using a slit covering the faint western source and the
bright, clearly separated eastern source noted by Kann et al. (GCN
7822). No obvious emission lines are evident in any spectrum. At any
of the host and absorber redshifts of z=1.688, z=1.563 and z=1.271
respectively, the bright potential emission features (Ly-alpha, OII) are
expected to fall outside our wavelength coverage, on top of sky lines,
or be strongly attenuated by the atmosphere, so this result is mildly
supportive of an association of these sources with the host and/or
absorbers. However, the integrations were relatively short, and further
follow-up is warranted.
- GCN Circular #7883
V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB
follow-up collaboration:
We observed a field of INTEGRAL GRB 080603A (Paizis et al., GCN 7790) in
R-band on June 04 between (UT) Jun.04 23:18:41 - Jun.05 00:12:41 with
Zeiss-1000 (Simeiz) telescope of CrAO observatory. At the place of the
optical afterglow (Gomboc et al., GCN 7788; Chornock et al., GCN 7789) we
detect an object with coordinates
RA(J2000): 18 37 38.02
Dec(J2000): +62 44 39.44
Within uncertainties (0.5" or better ) the coordinates of the object are
consistent with reported early (Gomboc et al., GCN 7788; Chornock et al.,
GCN 7789) and one can consider the object as afterglow of GRB 080603A.
A group of two extended sources (Perley et al., GCN 7870) is not resolved
in our later observation on 3.496 d (Rumyantsev et al. GCN 7860). The
unresolved source (Rumyantsev et al. GCN 7860) lies ~1.8" south from the
afterglow position. And tentatively one can consider the upper limit of the
observation on 3.496 days R=22.85 (3sigma) as an upper limit of the
afterglow brightness.
Based on USNOB1.0 star with ID 1527-0313986 at RA = 18:37:55.186, Dec.
+62:45:32.28 (R1 = 16.74) we estimated brightness of the afterglow on
1.521 days:
UT, Exposure, R_mag, UL
(mid time)
1.521 d 27x120 s 22.2 +/- 0.2 22.9
This message may be cited.
- GCN Circular #7887
E. Klunko (ISTP), A. Pozanenko (IKI) on behalf of larger GRB follow up
collaboration report:
We observed afterglow (Gomboc et al., GCN 7788; Chornock et al., GCN 7789)
of GRB 0800603A (Paizis et al., GCN 7790) with 1.5 m telescope of Sayan
observatory (Mondy) on Jun.03 between (UT) 18:21:30 - 18:43:55. The
afterglow is detected in each frame of 120 s exposure.
Coordinates of the afterglow obtained from a combined image are R.A.(J2000)
= 18 37 38.04 Dec.(J2000) = +62 44 39.4 with uncertainties of 0.3". A
photometry of the afterglow obtained against several USNO-A2.0 stars is
following:
T0+ Exposure R_mag
(mid)
0.3015 d 8x120 s 20.49 +/- 0.03
The photometry might be slightly contaminated by the nearby source(s)
(Perley
et al., GCN 7870, Rumyantsev et al., GCN 7860).
In comparison to the magnitude measured in early epoch (Perley et al. GCN
7791) the index of power law decay is ~ 0.5 which is compatible with slow
decay index (alpha ~ 0.5) obtained by Kann et al. (GCN 7822).
The combined image can be found at
The message may be cited.
- GCN Report 146.1
GCN_Report 146.1 has been posted:
http://gcn.gsfc.nasa.gov/reports/report_146_1.pdf
by B. Sbarufatti
at INAF-IASP Pa
titled: "Final Swift Observations on INTEGRAL GRB 080603A"
- GCN Circular #7976
V. Rumyantsev, K. Antoniuk (CrAO), E. Klunko (ISTP), A. Pozanenko (IKI)
report on behalf of larger GRB follow-up collaboration:
We observed the field of INTEGRAL GRB 080603A (Paizis et al., GCN 7790) in
R-band on June 03 between (UT) 19:16:25 - 19:43:54 with AZT-11(Nauchny)
telescope of CrAO observatory. We detect optical afterglow (Gomboc et al.,
GCN 7788; Chornock et al., GCN 7789) in coordinates
RA(J2000): 18 37 37.97
Dec(J2000): +62 44 38.9
with uncertanitie is 0.5".
Based on USNOB1.0 star with ID 1527-0313986 at RA = 18:37:55.186, Dec.
+62:45:32.28 (R1 = 16.74) we estimated brightness of the afterglow in a
combined image at 0.3424 days:
T0+, Exposure, R_mag, UL
(mid time)
0.3424 d 10x180 s 20.62 +/- 0.13 21.8
This message may be cited.
- 1105.1591 from 10 May 11
C. Guidorzi et al.: A faint optical flash in dust-obscured GRB 080603A - implications for GRB prompt emission mechanisms
We report the detection of a faint optical flash by the 2-m Faulkes Telescope North simultaneously with the second of two prompt gamma-ray
pulses in INTEGRAL gamma-ray burst (GRB) 080603A, beginning at t_rest = 37 s after the onset of the GRB. This optical flash appears to be
distinct from the subsequent emerging afterglow emission, for which we present comprehensive broadband radio to X-ray light curves to 13 days
post-burst and rigorously test the standard fireball model. The intrinsic extinction toward GRB 080603A is high (A_V,z = 0.8 mag), and the
well-sampled X-ray-to-near-infrared spectral energy distribution is interesting in requiring an LMC2 extinction profile, in contrast to the
majority of GRBs. Comparison of the gamma-ray and extinction-corrected optical flux densities of the flash rules out an inverse-Compton origin
for the prompt gamma-rays; instead, we suggest that the optical flash could originate from the inhomogeneity of the relativistic flow. In this
scenario, a large velocity irregularity in the flow produces the prompt gamma-rays, followed by a milder internal shock at a larger radius that
would cause the optical flash. Flat gamma-ray spectra, roughly F propto nu^-0.1, are observed in many GRBs. If the flat spectrum extends down
to the optical band in GRB 080603A, the optical flare could be explained as the low-energy tail of the gamma-ray emission. If this is indeed
the case, it provides an important clue to understanding the nature of the emission process in the prompt phase of GRBs and highlights the
importance of deep (R> 20 mag), rapid follow-up observations capable of detecting faint, prompt optical emission.
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