GRB 071010, GRB 071010A
GCN Circular 6934
Subject
GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
Date
2007-10-18T21:59:38Z (18 years ago)
From
Daniel Perley at U.C. Berkeley <dperley@astro.berkeley.edu>
D. A. Perley, A. V. Filippenko, J. M. Silverman, R. J. Foley, M. Modjaz,
D. Kocevski, and J. S. Bloom report:
We acquired an additional series of imaging observations of the field of
GRB 071010A (Moretti et al., GCN 6859) with Keck I + LRIS starting at
5:01 UT, 2007-10-16 (6.05 days after the trigger), in g and R filters.
The optical afterglow (Klotz et al. GCN 6860) has faded substantially.
An object is observed at the GRB position, resolvable into two regions:
a brighter, redder source to the east and a fainter, bluer source to the
west. Comparison with our previous Keck imaging shows the afterglow
position to be consistent only with the fainter, western source. The
two sources may be a bright elongated host galaxy, a compact host galaxy
with the afterglow offset from the center, or a foreground star with the
afterglow coincidentally located very nearby. An image of the field is
posted at: http://lyra.berkeley.edu/~dperley/071010a/071010a_keck.png
Aperture photometry shows the combined complex of both sources to have a
magnitude of R=22.5, using the same calibration system in previous
circulars. The contribution from the afterglow is limited to R>23.3,
depending on the uncertain contribution of a possible bright host galaxy.
Refined photometry of our imaging starting at 2007-10-11 UT 04:47 (GCN
6885) shows the afterglow magnitude at that time to be R = 19.82+/-0.02.
This indicates that the afterglow decay underwent a sharp break, from
alpha < 0.5 between the first and second night to a minimum of alpha >
1.7 over the following five days.
Comparison with the XRT light curve at
http://astro.berkeley.edu/~nat/swift/00293707/bat_xrt.jpg shows the
X-ray afterglow to have undergone a break at 10^5 seconds (roughly
coincident with our measurement on 2007-10-11) from approximately flat
evolution before this point to a rapidly decaying power law of alpha ~
1.8 afterward. This suggests that this sharp break may be achromatic,
and possibly indicative of a jet break.
[GCN OPS NOTE(18oct07): The "and jet break" was added back on to the
Subject-line of this circular. It was chopped off during processing
because the mail sending/delivery system chopps wrapped Subject lines.]
GCN Circular 6901
Subject
VLA non-detection of GRB 071010A
Date
2007-10-12T14:46:05Z (19 years ago)
From
Poonam Chandra at U Virginia/NRAO <pc8s@virginia.edu>
P. Chandra (UVA/NRAO) and D. A. Frail (NRAO) report on behalf of the
Caltech-NRAO-Carnegie GRB Collaboration:
"We observed the field centered on the BAT position of the Swift burst
GRB 0701010A (GCN#6859) using the VLA at a frequency of 8.46 GHz
and starting at 0.09 UT on Oct 12, 2007. We do not detect any radio emission
Keck optical position of the afterglow (GCN#6861). The flux density at
afterglow position is -4 � 35 uJy.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities, Inc."
GCN Circular 6885
Subject
GRB 071010A: Continued Keck Imaging
Date
2007-10-11T15:11:26Z (19 years ago)
From
Daniel Kocevski at UC Berkeley <kocevski@berkeley.edu>
D. Kocevski, D. A. Perley, and M. Modjaz (UC Berkeley) report:
Beginning at 04:47:42 UT (2007-10-11) we began a second series of
imaging on the field of GRB 071010A (GCN 6733) using the Keck I
telescope (+LRIS). We acquired 6 images with an effective exposure
of 270s in R band and 360s in V band.
The optical afterglow (GCN 6860) is still detected and has faded
since our previous imaging epoch (GCN 6872). Preliminary aperture
photometry of the source indicates that it has faded by 0.55
magnitudes since our previous imaging. Using the same calibration
system as in our previous circular, we estimate a preliminary
magnitude of R=19.42
GCN Circular 6881
Subject
Optical Observation: GRB 071010
Date
2007-10-11T12:40:48Z (19 years ago)
From
Rupak Roy at ARIES <roy@aries.ernet.in>
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Rupak Roy, K. Misra, and S. B. Pandey=20
(ARIES, NainiTal, India, on behalf of larger Indian GRB
collaboration)
We have imaged the field of Swift GRB 071010 (
Moretti et al. GCN6859) with the 1.04m telescope at NainiTal ~ 0.5
days after the burst. Observations were performed in R and I bands in
poor sky conditions.
We observed the afterglow candidate in R
and I bands reported by Klotz, A. et al. ( GCN 6860 ). Magnitude of=20
the OT is R ~ 20 in comparison to nearby USNO B1.0 stars.
This message can be cited.
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<p style=3D"margin-bottom: 0in;">Rupak Roy, K. Misra, and S. B. Pandey=20
(ARIES, NainiTal, India, on behalf of larger Indian GRB
collaboration)<br><br>We have imaged the field of Swift GRB 071010 (
Moretti et al. GCN6859) with the 1.04m telescope at NainiTal ~ 0.5
days after the burst. Observations were performed in R and I bands in
poor sky conditions.<br><br>We observed the afterglow candidate in R
and I bands reported by Klotz, A. et al. ( GCN 6860 ). Magnitude of=20
the OT is R ~ 20 in comparison to nearby USNO B1.0 stars.</p>
<p style=3D"margin-bottom: 0in;">This message can be cited.</p>
<br><br><br></BODY></HTML>
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GCN Circular 6880
Subject
Optical observations: GRB 071010A
Date
2007-10-11T12:12:29Z (19 years ago)
From
Kuntal Mishra at ARIES,Nainital,India <kuntal@aries.ernet.in>
Rupak Roy, K. Misra, and S. B. Pandey (ARIES, NainiTal, India, on behalf
of larger Indian GRB collaboration)
We have imaged the field of Swift GRB 071010 (Moretti et al. GCN6859)
with the 1.04m telescope at NainiTal ~ 0.5 days after the burst.
Observations were performed in R and I bands in poor sky conditions.
We observed the afterglow candidate in R and I bands reported by Klotz,
A. et al. (GCN 6860). Magnitude of the OT is R ~ 20 in comparison to
nearby USNO B1.0 stars.
This message can be cited.
GCN Circular 6876
Subject
GRB 071010A: bright NIR afterglow
Date
2007-10-11T01:07:21Z (19 years ago)
From
Daniele Malesani at Niels Bohr Inst,Dark Cosmology Center <malesani@astro.ku.dk>
D. Malesani (DARK), V. D'Elia (INAF/OAR), S. Covino (INAF/OABr), G.
Andreuzzi, A. Garcia de Gurtubai (INAF/TNG), and E. Maiorano (INAF/IASF
Bo), report on behalf of a larger collaboration:
We observed the optical afterglow of GRB 071010A (Moretti et al., GCN
6859; Klotz et al., GCN 6860) with the TNG telescope located in the
Canary Islands. Observations were carried out with the NICS instrument
equipped with the H filter, with mean time Oct 10.82 UT (15.7 hr after
the GRB).
At the position reported by Bloom et al. (GCN 6861), we clearly detect a
pointlike object, with H = 16.62 +- 0.05. We note that this value is
remarkably bright. Assuming typical afterglow colors (Fnu propto nu^-1),
this corresponds to R ~ 19. When compared to the Keck photometry
reported by Perley et al. (GCN 6872), this may suggest a flat segment or
even a flaring behaviour. Alternatively, the afterglow may be very red.
We thus encourage further observations to characterize the afterglow
light curve and spectrum.
This message can be cited.
GCN Circular 6872
Subject
GRB 071010A: Keck/LRIS Photometry
Date
2007-10-10T21:16:37Z (19 years ago)
From
Josh Bloom at UC Berkeley <jbloom@astron.berkeley.edu>
D. A. Perley, J. S. Bloom, M. Modjaz, and D. Poznanski (UC Berkeley)
report:
"In addition to the spectroscopic followup reported by Prochaska et
al. (GCN 6864), we acquired imaging of the GRB 071010A field in g and
R band with the Keck I 10m telescope (+LRIS) starting in twilight and
continuing until the object set. The fading afterglow reported by
Klotz et al. (GCN 6860) is well-detected.
Photometry, calculated relative to the USNO B1.0 catalog, is as follows:
t_start(min) R err
67.497 18.025 +/- 0.03
71.041 18.080 +/- 0.03
189.225 18.784 +/- 0.02
194.482 18.806 +/- 0.02
199.457 18.827 +/- 0.02
201.544 18.846 +/- 0.02
203.794 18.873 +/- 0.02
This photometry supersedes the preliminary report in GCN 6861 (Bloom
et al.). In addition, starting at 213 minutes after the trigger we
obtained a rapid series of 26 simultaneous g+R integrations of
typically 30 sec duration, lasting until 239 minutes after the
trigger. Analysis is ongoing."
This message may be cited.
GCN Circular 6870
Subject
GRB 071010: Swift-XRT observation
Date
2007-10-10T19:09:30Z (19 years ago)
From
Cristiano Guidorzi at INAF-OAB <cristiano.guidorzi@brera.inaf.it>
C. Guidorzi (Univ. Bicocca & INAF-OAB), V. Mangano (INAF-IASFPA)
A. Moretti (INAF-OAB), P. Romano (Univ. Bicocca & INAF-OAB),
report on behalf of the Swift-XRT team:
Swift XRT observed the GRB 071010 (trigger=293707, Moretti et al., GCN
Circ. 6859) beginning 34 ks after the BAT trigger. In 2.4 ks of Photon
Counting mode data spanning 34-40 ks after the trigger we found
the X-ray afterglow at RA,Dec =288.06008, -32.40172, which is
RA(J2000) = 19 12 14.42
Dec(J2000)= -32 24 06.2
with error circles of radius 5.3 arcsec (90%, including
boresight uncertainties).
This lies 2.8 arcsec from the position given by the Keck observation
(Bloom et al., GCN Circ. 6861) of the optical afterglow
discovered by TAROT (Klotz et al., GCN Circ. 6860) and
84.8 arcsec from the BAT refined position (Krimm et al., GCN Circ. 6868).
At present, due to the paucity of the observed events, we are unable
to determine the fading rate.
This circular is an official product of the Swift-XRT team.
GCN Circular 6868
Subject
GRB 071010, Swift-BAT refined analysis
Date
2007-10-10T15:13:28Z (19 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
H. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC),
E. Fenimore (LANL), N. Gehrels (GSFC), C. Guidorzi (U.Bicocca&INAF-OAB),
C. Markwardt (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC),
G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC),
T. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+394 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 071010 (trigger #293707)
(Moretti, et al., GCN Circ. 6859). The BAT ground-calculated position is
RA, Dec = 288.040, -32.385 deg which is
RA(J2000) = 19h 12m 9.7s
Dec(J2000) = -32d 23' 6"
with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 42%.
The mask-weighted light curve shows a single peak starting at ~T-10 sec,
peaking at ~T+1 sec, and ending at ~T+20 sec.
T90 (15-350 keV) is 6 +- 1 sec (estimated error including systematics).
The time-averaged spectrum from T-1.1 to T+5.9 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.33 +- 0.37. The fluence in the 15-150 keV band is 2.0 +- 0.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.80 sec in the 15-150 keV band
is 0.8 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
GCN Circular 6865
Subject
GRB 071010 REM NIR observations
Date
2007-10-10T08:04:22Z (19 years ago)
From
Paolo D'Avanzo at INAF-OAB <paolo.davanzo@brera.inaf.it>
P. D'Avanzo, D. Fugazza, S. Covino, L.A. Antonelli, L. Calzoletti, S.
Campana, G. Chincarini, M.L. Conciatore, S. Cutini, V. D'Elia, F.
Dalessio, F. Fiore, P. Goldoni, D. Guetta, C. Guidorzi, G.L. Israel,
N. Masetti, A. Melandri, E. Meurs, L. Nicastro, E. Palazzi, E. Pian, S.
Piranomonte, L. Stella, G. Stratta, G. Tagliaferri, G. Tosti, V.
Testa, S.D. Vergani, F. Vitali report on behalf of the REM team:
We observed the field of the GRB 071010 (Moretti et al., GCN 6859) with
the robotic 60-cm REM telescope located at La Silla (Chile). A set of
observations was performed automatically in the Z, J, H, K NIR filters
starting at 03:42:52 UT (about 100 sec after the burst) and lasted about
30 minutes due to visibility constraints.
The analysis of the first set of H-band exposures clearly show the
optical afterglow candidate reported by Klotz et al. (GCN 6860), Bloom
et al. (GCN. 6861), Haislip et al. (GCN. 6862) at a level of H =14.3 �
0.2 (calibrated against the 2MASS catalog). The afterglow is clearly
detected in all bands.
Futher analysis is in progress.
GCN Circular 6864
Subject
GRB 071010: Keck/LRIS Spectroscopy
Date
2007-10-10T07:56:39Z (19 years ago)
From
Jason Prochaska at UCO/Lick Obs <xavier@ucolick.org>
Jason X. Prochaska (UCSC), D. A. Perley, M. Modjaz, J.S. Bloom,
D. Poznanski (UC Berkeley), H.-W. Chen (U Chicago), report on behalf
of GRAASP:
"We observed the afterglow of GRB 071010 with the LRIS
dual spectrometer for a series of 900s exposures starting
at UT 05:00 under good conditions. Analysis of the blue side
reveals a strong MgII absorber and corresponding FeII lines
at z=0.98. The absence of strong features in the spectrum
redward of 5700A suggests this is the redshift of
the GRB. A more conservative upper limit is placed by
the absence of IGM signatures at 3400A which
indicates z_GRB < 1.8.
Further analysis is in progress."
This GCN may be cited.
GCN Circular 6863
Subject
GRB 071010: TAROT La Silla observatory photometry of the afterglow
Date
2007-10-10T07:35:34Z (19 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 derived accurate photometry of the afterglow
of GRB 071010 (cf. Klotz et al. GCNC 6860) from
TAROT, R and unfiltered images. We converted unfiltered
magnitudes into R band using a simple offset
assuming a low redshift (z<2) and a continuum
spectrum as described by Bloom et al. (GCNC 6861).
The afterglow is fainter than previously annonced
in GCNC 6860. We observed a rise of brightness
at a rate alpha=-0.9 (+/-0.5) until
about 470s after the trigger (+/-60s)
with a maximum brightness R=17.0.
Then the afterglow has decreased at a rate
alpha=+0.8 (+/-0.1) until at less 90 minutes
after the trigger (R=19.1 at t_trig+90min).
Observations are now finished in Chile due to
the set of the GRB.
This message may be cited..
GCN Circular 6862
Subject
GRB 071010: Rapid PROMPT Detections
Date
2007-10-10T06:45:21Z (19 years ago)
From
Josh Haislip at U.North Carolina <haislip@physics.unc.edu>
J. Haislip, D. Reichart, M. Nysewander, A. LaCluyze, K. Ivarsen, J. A.
Crain, A. Foster, M. Schubel, J. Styblova, T. Brennan, and A. Trotter
report:
Skynet observed the localization of GRB 071010 (Moretti et al., GCN 6859)
with three of the 16" PROMPT telescopes at CTIO beginning 90 seconds after
the burst (35 seconds after notification) in BVRI.
We detect the afterglow (Klotz et al., GCN 6860) in all filters. At 2.6
minutes after the burst, we measure I ~ 17.5 mag.
GCN Circular 6861
Subject
GRB 071010: Keck Observations of the Afterglow
Date
2007-10-10T05:37:15Z (19 years ago)
From
Josh Bloom at UC Berkeley <jbloom@astron.berkeley.edu>
J. S. Bloom, D. A. Perley, M. Modjaz, D. Poznanski (UC Berkeley), H.-
W. Chen (U Chicago), and J. X. Prochaska (UCSC) report:
"We have conducted preliminary imaging with the Keck I telescope
(+LRIS) of the afterglow seen in TAROT (Klotz et al. GCN 6860) of GRB
071010 (Moretti et al. 6859). In the first set of short exposures
(~100 sec) in R and G bands (starting at 04:48:34 UT) we detect a
source near that position with a magnitude comparable to the faintest
detectable DSS sources (corresponding to R~20 - 21 mag). We report a
refined position (+/- 300 mas relative to USNO B1.0):
ra= 19:12:14.624 dec= -32:24:07.16 J2000
The offset from the star at 19:12:17.121, -32:24:18.65 to the
afterglow is 31.62" W, 11.49 "N. Spectroscopy is underway and reports
from that analysis are forthcoming (the continuum is detected to the
atmospheric cutoff in the blue, implying z<~2)."
This message may be cited.
We thank A. Klotz for helpful conversations regarding the TAROT
afterglow detection.
GCN Circular 6860
Subject
GRB 071010: TAROT La Silla observatory detection of the afterglow
Date
2007-10-10T04:09:00Z (19 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 071010 detected by SWIFT
(trigger 293707) with the TAROT robotic telescope (D=25cm)
located at the European Southern Observatory,
La Silla observatory, Chile.
The observations started 124.7s after the GRB trigger
(70.5s after the notice). The elevation of the field decreased from
from 26 degrees above horizon and weather conditions
were good.
We detect a new rsising source in the error box given by SWIFT
at the following position (+/- 3 arcsec):
RA(J2000.0) = 19h 12m 14.73s
DEC(J2000.0) = -32d 24' 07.1"
OT was R~15.6 at ~400s after GRB.
We continue to observe.
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon= 5.2380 lat=-18.2310
and the galactic extinction in R band is 1.3 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular 6859
Subject
GRB 071010: Swift detection of a burst
Date
2007-10-10T03:56:03Z (19 years ago)
From
David Palmer at LANL <palmer@lanl.gov>
A. Moretti (INAF-OAB), W. H. Baumgartner (GSFC/UMBC),
N. Gehrels (NASA/GSFC), S. T. Holland (CRESST/USRA/GSFC),
D. M. Palmer (LANL), M. Stamatikos (NASA/ORAU) and
T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 03:41:12 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 071010 (trigger=293707).
The BAT on-board calculated location is
RA, Dec 288.101, -32.379 which is
RA(J2000) = 19h 12m 24s
Dec(J2000) = -32d 22' 42"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a broad
structure with a duration of about 30 sec. The peak count rate
was ~600 counts/sec (15-350 keV), at ~2 sec after the trigger.
Because Swift is in the process of returning to normal operations,
automatic slewing to GRBs is currently disabled outside of
business hours (US EDT). Therefore, there
are no prompt XRT or UVOT observations of this burst.
Burst Advocate for this burst is A. Moretti (moretti AT merate.mi.astro.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.)