GRB 071109
GCN Circular 7046
Subject
GRB 071109: A long GRB detected by INTEGRAL
Date
2007-11-09T21:41:34Z (18 years ago)
From
Volker Beckmann at ISDC <Volker.Beckmann@obs.unige.ch>
S. Mereghetti (IASF-Milano), V. Beckmann, I. Kreykenbohm, M. Beck
(ISDC, Versoix), A. Paizis (IASF-Milano), D. Gotz (CEA-Saclay), and J.
Borkowski (CAMK,
Torun) on behalf of the IBAS Localization Team report:
A GRB lasting about 30s has been detected by IBAS in IBIS/ISGRI data
on November 9 at 20:36:05 UT.
The coordinates (J2000) are:
RA: 289.913 [degrees]
DEC: +2.048 [degrees]
with an uncertainty of 2.5 arcmin. This message can be cited.
GCN Circular 7047
Subject
GRB 071109: BOOTES-2 prompt optical observations
Date
2007-11-09T23:36:20Z (18 years ago)
From
Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>
Antonio de Ugarte Postigo (ESO Santiago), Martin Jel�nek,
Petr Kub�nek, Alberto J. Castro-Tirado (IAA-CSIC Granada)
and Lola Sabau-Graziati (INTA Madrid), on behalf of the
BOOTES collaboration,
report:
"The robotic telescope BOOTES-2 located at Estaci�n Experimental
de La Mayora (EELM-CSIC) in southern Spain followed automatically
the INTEGRAL GRB 071109 (Mereghetti et al, GCN 7046). Images
were taken under non-optimum conditions (GRB location at high
airmass and thick cirruses passing) starting 59s after the GRB (31s
after the GCN notice).
We do not detect any new source within the INTEGRAL/IBIS error
box down to our unfiltered, USNO-A2 calibrated magnitude of ~13.0
in our first exposures ranging between 20:37:05 and 20:37:20 UT.
Further analysis is ongoing.
Note the moderate extinction in the line of sight: E(B-V) = 0.61,
i.e. Ar = 1.46."
GCN Circular 7048
Subject
GRB 071109: IBIS refined analysis
Date
2007-11-10T00:45:13Z (18 years ago)
From
Diego Gotz at IASF-CNR <dgotz@cea.fr>
D. Gotz (CEA-Saclay) on behalf of the IBAS Localization Team reports:
Further analysis of the INTEGRAL GRB 071109 (Mereghetti et al., GCN 7046)
using IBIS/ISGRI data yielded the following results.
The peak flux of the burst integrated over 1 s in the 20-200 keV energy
range is 0.46 photons (3.6E-8 ergs)/cmsq/s. The fluence in the same band,
integrated over 30 s, is 6.6E-7 ergs/cmsq.
This message can be cited.
GCN Circular 7050
Subject
GRB 071109: Swift-XRT possible X-ray counterpart
Date
2007-11-10T03:38:54Z (18 years ago)
From
Matteo Perri at ISAC/ASDC <perri@asdc.asi.it>
M. Perri, G. Stratta (ASDC) and D.N. Burrows (PSU) report on behalf of
the Swift-XRT team:
Swift-XRT began observing the field of view of the INTEGRAL-detected
long burst GRB 071109 (Mereghetti et al., GCN Circ. 7046) at 22:21:50 UT
on 2007 November 9, ~1.7 hours after the INTEGRAL trigger. We currently
have 4.8 ks of XRT data, in which we detect a faint, uncatalogued X-ray
source at a position of RA,Dec(J2000)= 289.974583,+2.046528 degrees, which
is equivalent to:
RA (J2000 = 19h 19m 53.9s
Dec(J2000) = +02d 02' 47.5"
with an estimated uncertainty of 9 arcsec (radius, 90% confidence).
This is 3.7 arcmin from the INTEGRAL position (Mereghetti et al.,
GCN Circ. 7046), outside its error circle. We note also that this
position is 1.1 arcmin away from the VLA radio source reported in
GCN Circ. 7049 (Chandra & Frail).
The source has a count rate of (2.5 +/-0.9)e-3 counts s-1. At present we
are unable to determine whether the source is fading, however observations
are ongoing and further analysis of these XRT data will be reported
in a subsequent circular.
This circular is an official product of the Swift-XRT team.
GCN Circular 7052
Subject
GRB 071109: TAROT Calern observatory optical observations
Date
2007-11-10T16:07:00Z (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 071109 detected by INTEGRAL
(trigger 4761) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.
The observations started 36s after the GRB trigger
(8s after the notice). The elevation of the field decreased from
from 12 degrees above horizon and weather conditions
were good.
We analyzed carefully the following zones:
Mereghetti et al. 2007 (GCNC 7046):
Center 19h19m39.12m +02�02'52.8" radius=2.5 arcmin
Chandra & Frail 2007 (GCNC 7049):
Center 19h19m51.67m +02�01'49.9" radius=15 arcsec
Perri, Stratta et al. 2007 (GCNC 7050):
Center 19h19m53.9m +02�02'47.5" radius=9 arcsec
The first TAROT image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+36s to t0+96s : R > 15.4
The second image is 30.0s exposure in tracking mode:
t0+103s to t0+133s : R > 15.5
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon= 37.9724 lat= -5.3391
and the galactic extinction in R band is about 1.8 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular 7053
Subject
GRB 071109: further Swift-XRT analysis
Date
2007-11-10T19:05:09Z (18 years ago)
From
Matteo Perri at ISAC/ASDC <perri@asdc.asi.it>
M. Perri, G. Stratta (ASDC) and D.N. Burrows (PSU) report on behalf of
the Swift-XRT team:
We have analysed a further 4.9 ks of Swift-XRT Photon Counting mode data
of the field of the INTEGRAL burst GRB 071109 (Mereghetti et al.,
GCN Circ. 7046), beginning ~5 hours after the INTEGRAL trigger.
The possible afterglow candidate reported in GCN Circ. 7050 (Perri et al.)
is detected also in this second image with a count rate of (2.4 +/-0.8)e-3
cts/s and thus is consistent with being constant between the two
observations. We note that this X-ray source lies 3.7 arcmin from the
INTEGRAL position and outside its 2.5 arcmin error circle.
In the total Photon Counting mode exposure of 9.7 ks we did not detect
any X-ray source within the INTEGRAL error circle (Mereghetti et al.,
GCN Circ. 7046) or at the position of the VLA radio source reported in
GCN Circ. 7049 (Chandra & Frail). We estimate a three sigma upper limit
on the count rate of about 1.5e-3 cts/s. Assuming a power-law spectrum
with
photon index Gamma=2 and a Galactic column of 2.5e21 cm-2, this
corresponds
to an upper limit on the observed flux of ~7e-14 ergs/cm2/s (0.3-10 keV).
This circular is an official product of the Swift-XRT team.
GCN Circular 7054
Subject
Swift/UVOT initial analysis of GRB071109
Date
2007-11-11T01:41:58Z (18 years ago)
From
Paul Kuin at MSSL <npkuin@googlemail.com>
N.P.M. Kuin (MSSL/UCL) and M. Perri (ASDC) report on behalf of the
Swift-UVOT team:
The Swift/UVOT observed the INTEGRAL burst GRB 071109 (Mereghetti
et al. GCN Circ. 7046) starting at 22:21 UT, 105 minutes after the
trigger, cycling through exposures in the the uvw1, u, b, uvw2, v
and uvm2 filters. No afterglow is detected at the position of the VLA
measurement (Chandra et al. GCN Circ. 7049). A possible source at
position RA=19:19:42.303,DEC=+02:01:21.14(J2000) was investigated,
since it was detected at the 3-sigma level (u=20.9+/-0.6 mag) in
the coadded U-filter images. This source is considered spurious
since it was not found in any of the other filters, taken before
or after the U-filter exposures.
No other fading source is found within the INTEGRAL error circle
in this is a crowded field.
The following 3-sigma upper limits were determined at the position
of the VLA detection (RA=19:19:51.67,DEC=+02:01:49.88):
Filter Tstart(s) Tstop(s) Exp(s) Mag (3-sigma Upper Limits)
uvw1 6350 24158 1678 > 21.47
u 6782 24373 835 > 21.17
b 7000 24588 835 > 21.56
uvw2 7220 25435 3346 > 22.25
v 8078 25651 835 > 20.58
uvm2 8300 26033 2189 > 21.73
The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E_{B-V} = 0.61 mag in the
direction of the burst (Schlegel et al. 1998).
GCN Circular 7055
Subject
VLA IInd observation of INTEGRAL burst GRB 071109
Date
2007-11-11T03:56:14Z (18 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 INTEGRAL burst GRB 071109 again using the VLA at a
frequency of 8.46 GHz. The observations were taken at 0.87 UT on 2007,
November 11th. We do not detect any radio emission at the position of our
last detection (GCN 7049). The flux density limit is 33+/-28 uJy. This
probably means that either our 10th November radio detection was not real
or it was detection from the reverse shock, which faded away by now. We
still do not detect any source at Swift-XRT position (GCN 7050).
The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities, Inc."
GCN Circular 7056
Subject
GRB071109: Super-LOTIS observations
Date
2007-11-11T07:39:50Z (18 years ago)
From
Peter A. Milne at Super-LOTIS <pmilne511@cox.net>
P.A. Milne (U Arizona) reports on behalf of the
Super-LOTIS team:
The 0.60m Super-LOTIS telescope began R-band observations of the error
region of INTEGRAL burst, GRB071109 (Mereghetti et al. GCN 7046), at
02:03:35 UT on 11-09-2007, ~337 minutes after the burst. Observations
consisting of 48x60 second exposures were made through thin clouds.
An afterglow was not detected at the positions of the VLA candidate
source (Chandra et al. GCN 7049), nor the XRT candidate source
(Perri, Stratta and Burrows GCN 7050), nor the UVOT candidate
source (Kuin and Perri GCN 7054).
Based upon R2 magnitudes were derived from the USNO-B1.0 catalog,
the 3-sigma upper limit of the stacked image is R > 19.7.
This message can be cited.