GRB 061222B
GCN Circular 5956
Subject
GRB 061222b: optical afterglow
Date
2006-12-22T04:33:34Z (18 years ago)
From
Edo Berger at Carnegie Obs <eberger@ociw.edu>
E. Berger (Carnegie) reports:
"We imaged the location of GRB 061222b with LDSS3 on Magellan. Within the
XRT error circle we find a bright optical afterglow at:
RA = 07:01:24.6
DEC = -25:51:36
with an uncertainty of about 1". Spectroscopic observations are in
progress."
GCN Circular 5957
Subject
GRB 061222B: Swift detection of a burst
Date
2006-12-22T04:50:44Z (18 years ago)
From
David Palmer at LANL <palmer@lanl.gov>
J. L. Racusin (PSU), L. M. Barbier (NASA/GSFC),
S. D. Barthelmy (GSFC), P. J. Brown (PSU), M. M. Chester (PSU),
J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), D. Grupe (PSU),
J. A. Kennea (PSU), F. E. Marshall (NASA/GSFC),
K. M. McLean (LANL/UTD), D. M. Palmer (LANL) and
M. Stamatikos (NASA/ORAU) report on behalf of the Swift Team:
At 04:11:02 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 061222B (trigger=252593). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 105.357, -25.855 which is
RA(J2000) = 07h 01m 26s
Dec(J2000) = -25d 51' 19"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a single rounded
peak with a duration of about 50 sec. The peak count rate
was ~800 counts/sec (15-350 keV), at ~48 sec after the trigger.
The XRT began observing the field at 04:13:27 UT, 145 seconds after the
BAT trigger. XRT found a bright, fading, uncatalogued X-ray source
located at RA, Dec 105.35372, -25.8592 which is
RA(J2000) = 07h 01m 24.89s
Dec(J2000) = -25d 51' 33.1"
with an estimated uncertainty of 4.1 arcseconds (90% confidence radius).
This location is 18.5 arcseconds from the BAT on-board position, within
the BAT error circle. The initial flux in the 2.5s image was
1.3e-09 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 400 seconds with the V filter
starting 146 seconds after the BAT trigger. No afterglow candidate
has been found in the initial data products. We note that there is no
detected source flux in the UVOT V image at the position of the
afterglow candidate reported in GCN 5956. The 2.7'x2.7' sub-image
covers 100% of the XRT error circle. The 3-sigma upper limit is 19.0
mag. The 8'x8' region for the list of sources generated on-board
covers 100% of the XRT error circle. The limiting magnitude is
expected to be about 17.8. No correction has been made for the
expected extinction of about 1.3 magnitudes.
GCN Circular 5958
Subject
GRB 061222b: Magellan redshift
Date
2006-12-22T04:55:36Z (18 years ago)
From
Edo Berger at Carnegie Obs <eberger@ociw.edu>
E. Berger (Carnegie) reports:
"Spectroscopic observations of the afterglow (GCN 5956) of GRB 061222b
(GCN 5957) with LDSS3 on Magellan reveal a strong continuum break at about
5340A corresponding to Ly-alpha at z~3.4."
GCN Circular 5959
Subject
GRB 061222B: TAROT La Silla observatory optical observations
Date
2006-12-22T05:00:20Z (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 061222B detected by SWIFT
(trigger 252593) with the TAROT robotic telescope (D=25cm)
located at the European Southern Observatory,
La Silla observatory, Chile.
The observations started 149.8s after the GRB trigger
(70.0s after the notice). The elevation of the field increased from
from 70 degrees above horizon and weather conditions
were excellents.
The date of trigger : t0 = 2006-12-22T04:11:02.112
The first image is 30.0s exposure in tracking mode.
We do not detect any OT in the XRT error box
(Racusin et al. 2006 CNC circ. 5957)
with a limiting magnitude of:
t0+149.8s to t0+179.8s : R > 17.9
It must be noticed that the XRT position is near
the star USNO-B1.0 0641-0103283 (R=9.3) that can
masks a faint afterglow on TAROT images.
The second image is 30.0s exposure in tracking mode:
t0+185.4s to t0+215.4s : R > 17.9
We co-added a series of exposures:
t0+149.8s to t0+534.5s : R > 19.9
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=237.2359 lat= -9.4366
and the galactic extinction in R band is 0.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular 5960
Subject
GRB 061222B: TAROT La Silla observatory afterglow observation
Date
2006-12-22T05:21:30Z (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 analyzed carefully the afterglow position
provided by Berger GNC Circ. 5956 on TAROT
la Silla images. A very faint source is detected
only on the first 30s image obtained from
150 to 180 seconds after the trigger.
We estimate a magnitude R=18.2 +/- 0.5 (S/N=2).
N.B. As we mentioned in the GCN Circ. 5959,
the GRB position is near the star USNO-B1.0
0641-0103283 (R=9.3). The afterglow lies at the
end of a "arm spider" of the star.
GCN Circular 5961
Subject
GRB 061222b, SMARTS optical/IR afterglow observations
Date
2006-12-22T05:31:57Z (18 years ago)
From
Bethany Cobb at Yale U <cobb@astro.yale.edu>
B. E. Cobb (Yale), part of the larger SMARTS consortium, reports:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we
obtained optical/IR imaging of the error region of GRB 061222b
(GCN 5957, Racusin et al.), with a mid-exposure time of
2006-12-22 04:42:11 UT, which is ~0.5 hours post-burst.
Several dithered images were obtained in each filter,
with total summed exposure times of 180s in each of BRIYJK and
120s in each of H and V.
In the I-band a dim object is detected with a preliminary
magnitude of I=20.7+/-0.4 at the position of the afterglow
reported by Berger (GCN 5956). This source is not significantly
detected in the J-band to a limiting magnitude of J<18.
Photometry is calibrated with USNO-B1.0 stars in the optical
and 2MASS stars in the IR. Photometry is effect by high background
due to the nearby bright star.
GCN Circular 5962
Subject
GRB 061222b: Refined redshift
Date
2006-12-22T05:33:56Z (18 years ago)
From
Edo Berger at Carnegie Obs <eberger@ociw.edu>
E. Berger (Carnegie) reports:
"Using several metal absorption features (e.g., SiII, CII, SiIV, etc.) in
our first 1800 sec spectroscopic observation we determine a refined
redshift for GRB 061222b of z=3.355."
GCN Circular 5963
Subject
GRB 061222B: REM NIR/optical observations
Date
2006-12-22T05:48:20Z (18 years ago)
From
Stefano Covino at Brera Astronomical Observatory <stefano.covino@gmail.com>
S. Covino, E. Di Stefano, E. Molinari, G. Chincarini, F.M. Zerbi, V.
Testa, G. Tosti, F. Vitali, P. Conconi, L.A. Antonelli, G. Cutispoto,
G. Malaspina, L. Nicastro, E. Palazzi, E. Meurs, and P. Goldoni
report on behalf of the REM/ROSS team:
We imaged the field of GRB 061222B (Racusin et al. GCN 5957) with
the robotic 60-cm REM telescope located at La Silla (Chile). A first
set of observations was performed automatically in the optical and
near infrared (V,R,I and z', J, H, K bands).
A preliminary analysis allows to marginally detect the afterglow
identified by Berger (GCN 5956) at H ~ 16.0 at 4:14:48 UT.
This message may be cited.
GCN Circular 5967
Subject
GRB 061222B: SARA upper limit
Date
2006-12-22T08:36:17Z (18 years ago)
From
Adria C. Updike at Clemson U <aupdike@clemson.edu>
A. C. Updike and D. H. Hartmann (Clemson University)
report on behalf of the Clemson GRB Follow-Up Team:
We imaged the field of GRB 061222B 45 minutes after Swift Trigger 252593
with the SARA 0.9m at Kitt Peak under good weather conditions. We
obtained 20 180-second exposures in the R band. We find no fading OT
candidate at the position noted by E. Berger (GCN 5956) in the stacked
images down to a limiting magnitude of R = 19.0 +/- 0.2 mag (based on
calibration to USNO A2.0).
The Clemson Unversity GRB Response Site may be found at:
http://people.clemson.edu/~kgarime/burst/index.php
The SARA Homepage can be found at:
http://saraobservatory.org
This message may be cited.
GCN Circular 5968
Subject
GRB 061222B: BOOTES-IR optical observations
Date
2006-12-22T09:16:20Z (18 years ago)
Edited On
2024-11-18T10:06:47Z (7 months ago)
From
Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>
A. de Ugarte Postigo, M. Jelínek, A. J. Castro-Tirado, V. Casanova, J.
Gorosabel,
R. Cunniffe, S. Vitek (IAA-CSIC Granada), P. Kubánek (Univ. de Valencia),
R. Hudec (ASU-CAS Ondrejov) and L. Sabau-Graziati (INTA Madrid),
report:
"Following the detection of GRB 061222B by SWIFT (GCN 5957), the field was
imaged with the 60-cm BOOTES-IR robotic telescope located at Observatorio
de Sierra Nevada (Granada, Spain). Observations were taken in the R-band
starting
at 04:12:44 U.T. (i.e. 102 s after the onset of the event). On a co-add
of several images
(30s total time) taken at 04:18:46 (464 s after the GRB trigger), the
optical afterglow
(GCNC 5956) is detected with R = 17.7 +/- 0.5. The high airmass (~4.3)
prevented
taking high quality data. Further analysis is ongoing."
This message may be cited.
GCN Circular 5970
Subject
GRB061222B: Swift-XRT Refined Analysis
Date
2006-12-22T14:00:47Z (18 years ago)
From
Judith Racusin at PSU <racusin@astro.psu.edu>
J. L. Racusin, J. Kennea (PSU), J. P. Osborne, and K. L. Page (U
Leicester) report on behalf of the Swift XRT team:
We have analyzed the first two orbits of Swift-XRT data on GRB 061222B
(Racusin et al. GCN 5957), with a total exposure of 119 seconds in Window
Timing (WT) mode and 906 seconds in Photon Counting (PC) mode. This
provides a refined XRT position at RA, Dec = 105.35321, -25.8594 which is:
RA(J2000) = 7h 01m 24.77s
Dec(J2000) = -25d 51' 33.9"
with an estimated error radius of 3.7 arcseconds (90% confidence). This
position is 20 arcseconds from the initial BAT position (Racusin et al.
GCN 5957), 1.8 arcseconds from the initial XRT position (Racusin et al.
GCN 5957), and 3.1 arcseconds from the optical candidate discovered by
Berger et al. (GCN 5956).
The 0.3-10 keV X-ray light curve between 145s and 4900s after the trigger
can be fit with a broken power-law with an initial decay slope of 3.26 +/-
0.10, a break at 450s, and a post-break slope of 1.24 +/- 0.15.
The X-ray spectrum from the WT data covering the time period from T+145s
to T+264s is well fit by an absorbed power-law with a photon index of 2.6
+/- 0.2 and column density of (4.0 +/-0.6 )e21 cm**-2. We note the
Galactic column density in the direction of the source is 2.7e20 cm**-2.
The unabsorbed 0.3-10 keV flux for this spectrum is 8.7e-10 erg/cm**2/s.
Assuming the X-ray emission continues to decline at the same rate, we
predict a 0.3-10 keV XRT count rate of 1e-3 count/s at T+24hr, which
corresponds to an observed 0.3-10 keV flux of 3.6e-14 erg/cm**2/s.
After the initial first orbit and partial second orbit of automated
observations, the automated target was changed back to GRB061222A due to
XRT thermal constraints. Observations of GRB061222B will continue at a
later time.
This circular is an official product of the Swift XRT Team.
GCN Circular 5971
Subject
GRB 061222B: Observation with the KANATA 1.5m telescope
Date
2006-12-22T15:50:42Z (18 years ago)
From
Makoto Uemura at Hiroshima U <uemuram@hiroshima-u.ac.jp>
M. Uemura, A. Arai, and T. Uehara (Hiroshima Univ.),
report on behalf of the KANATA GRB team:
We perfomed optical imaging of the field of GRB061222B (GCN 5957) at
15:10-15:17 UT 22 Dec. using the TRISPEC attached to the KANATA
1.5-m telescope at Higashi-Hiroshima Observatory, Japan.
We obtained 4 R-band images with a 123-s exposure time. The images were
calibrated with neighbor stars in the USNO A2.0 catalog (r mag.).
We cannot significantly detect the afterglow at the position reported in
GCN 5956 in our images. The limit magnitude is estimated to be 20.2
(3-sigma).
UT Time after the burst (s) Limit mag in R Exp. Time
Dec. 22.63480 39784 20.2 123 * 4
GCN Circular 5972
Subject
GRB 061222B: Swift/UVOT Upper limits
Date
2006-12-22T17:47:43Z (18 years ago)
From
Shashi Pandey at MSSL <sbp2@mssl.ucl.ac.uk>
S. B. Pandey (UCL-MSSL), J. L. Racusin (PSU), S. R. Oates (UCL-MSSL)
report on the behalf of the Swift UVOT team:
The Swift/UVOT observed the field of GRB061222B starting 136 sec
after the BAT trigger (GCN Circ. 5957). We do not detect the afterglow
candidate reported in GCN Circ.5956 in our V band exposures. This is in
accordance with the observed redshift of z=3.355 (GCN Circ. 5962) for
the burst.
The determined 3-sigma upper limits for V band settling, finding-chart
exposures and for the co-added frames of the observed UVOT filters are:
Filter T_start T_stop Exp(s) Mag (3-sigma upper limit)
-----------------------------------------------------------------
V settling 136 145 9 17.29
V finding 146 546 393 19.77
V 136 890 475 19.86
B 624 4884 141 20.29
U 600 4755 235 19.98
UVW1 576 4551 255 19.76
UVM2 552 4346 255 19.96
UVW2 640 794 38 18.64
-----------------------------------------------------------------
The values quoted above are not corrected for the expected Galactic
extinction of E_{B-V} = 0.38 mag towards the burst direction
(Schlegel et al. 1998).
GCN Circular 5974
Subject
GRB 061222B, Swift-BAT refined analysis
Date
2006-12-22T20:38:24Z (18 years ago)
From
Jay R. Cummings at NASA/GSFC/Swift <jayc@milkyway.gsfc.nasa.gov>
L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL),
A. Parsons (GSFC), J. L. Racusin (PSU), T. Sakamoto (GSFC/ORAU),
G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC)
on behalf of the Swift-BAT team:
Using the data set from T-239.0 to T+903.1 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 061222 (trigger #252593)
(Racusin, et al., GCN Circ. 5957). The BAT ground-calculated position
is RA, Dec = 105.352, -25.865 deg which is
RA(J2000) = 7h 1m 24.6s
Dec(J2000) = -25d 51' 55.6"
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 16%.
The burst had a single gradual peak with several sub peaks.
T90 (15-350 keV) is 40 +- 5 sec (estimated error including systematics).
At this time, there is a gap in the downlinked data from T+480 sec to
T+660 and T+720 to T+840 sec. A further Circular will be issued if
burst activity is found in these intervals.
The time-averaged spectrum from T+35.1 to T+84.3 is best fit by
a simple power-law model. The power law index of the time-averaged
spectrum is 1.98 +- 0.13. The fluence in the 15-150 keV band is
2.2 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from
T+59.16 sec in the 15-150 keV band is 1.5 +- 0.4 ph/cm2/sec. All the
quoted errors are at the 90% confidence level.
GCN Circular 5977
Subject
GRB 061222B: MITSuME Akeno optical upper limits
Date
2006-12-24T15:32:47Z (18 years ago)
From
Nobuyuki Kawai at Tokyo Tech <nkawai@hp.phys.titech.ac.jp>
T. Ishimura, Y. Yatsu, T. Shimokawabe, N. Vasquez, and N. Kawai (Tokyo
Tech) report on behalf of the MITSuME collaboration:
We observed the error box of GRB061222B (Racusin et al., GCN 5957)
with the 3-color 50cm MITSuME Telescope at Akeno, Japan starting at
12:52:28 UT, 8.7 hours after the trigger.
In the co-added images of Ic, Rc, and g' bands, we did not detect
the afterglow (Berger, GCN 5956). The 3-sigma limiting
magnitudes based on USNO-B1.0 (I-band) and NOMAD (R-band,g'-band)
stars are following.
Filter start time end time Exp(s) Mag (3-sigma upper limit)
-----------------------------------------------------------------
Ic 12:52:28 13:29:50 60s * 29 18.3
Rc 12:52:28 13:29:50 60s * 29 19.7
g' 12:52:28 13:29:50 60s * 29 19.4
-----------------------------------------------------------------
GCN Circular 5981
Subject
GRB 061222B: TAROT La Silla observatory early optical observations
Date
2006-12-25T01:48:01Z (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 solve technichal problems that prevent to
acces to the first trailed image of GRB 061222B
obtained with TAROT located at the European Southern
Observatory, La Silla observatory, Chile.
The observations started 84.1s after the GRB trigger
(4s after the notice). The trailed image allows to
follow continuously variable source during the 60s
integration time (see technichal description in
Klotz et al., 2006, A&A 451, L39). The GRB expected
trail is blended with the trail of the USNO-B1 star
0641-0103259 of R=14.7 after 24s. During the 24 first
seconds we do not detect the optical transient brighter
than R~17.7. Moreover, we confirm the optical detection
in the first non trailed image (Klotz et al. GCN Circ.
5960) taken in the range t0+150 to t0+180s.
To summarize:
t0+ 84s to t0+108s : R > 17.7
t0+108s to t0+144s : R > 14.7
t0+150s to t0+180s : R = 18.2 +/- 0.5 (GCNC 5960)
t0+185s to t0+215s : R > 18.2
t0+150s to t0+534s : R = 19.9 (GCNC 5959)
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
This message may be cited.
GCN Circular 5998
Subject
VLA observation of GRB 061222B
Date
2007-01-06T02:31:25Z (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
061222B (GCN 5957) at a frequency of 8.46 GHz on 2006 December 23 at
8.11 UT. The peak radio brightness at the XRT position
(GCN 5970) is -34 uJy � 54 uJy.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities, Inc."