GRB 060211B
GCN Circular 4925
Subject
GRB060211B: optical observation
Date
2006-03-27T11:55:31Z (20 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
D. Sharapov (MAO, and NOT, La Palma), M. Ibrahimov (MAO) and A. Pozanenko
(IKI), on behalf of larger GRB follow up collaboration report:
We observed GRB 060211B (Mateos et al., GCN 4739; Tueller et al., GCN 4747)
with 1.5m telescope of Maidanak Astronomical Observatory in R-band on Feb.
20 (UT) 16:16 - 16:50 (Salyamov et al., GCN 4744). In combined image we
marginally detect two objects within refined XRT error circle Page et al.
(GCN 4745):
id1: RA(J2000) = 05:00:17.11
Dec = +14:57:01.06
id2: RA(J2000) = 05:00:17.19
Dec = +14:56:55.74
Mid. time, Exp., id1, id2, Limit, Seeing
(UT) (s)
Feb.11.6895 6x300 22.1 +/-0.3 22.3 +/-0.3 22.1 ~1.3"
The photometry and astrometry is based on USNO B1.0. The both objects are
not detectable in separate images, in particular in the first image obtained
starting 20.7 minutes from burst onset.
Combined image can be found in
http://grb.rssi.ru/GRB060211b/grb060211b_AZT22R.jpg
GCN Circular 4778
Subject
GRB 060211B: Swift/UVOT Upper Limits
Date
2006-02-18T12:25:30Z (20 years ago)
From
Padi Boyd at GSFC <padi@milkyway.gsfc.nasa.gov>
P. Boyd (GSFC), S. Mateos (U Leicester) and F. Marshall (GSFC)
on behalf of the Swift/UVOT team report:
The Swift/UVOT began observing the field of GRB 060211B at
15:56:39 UT on 2006-02-11, approximately 83 s after the BAT
trigger (Mateos et al., GCN 4739). No source is detected in the
refined XRT error circle (Page et al., GCN 4745) in the initial
V finding chart, nor the summed images down to the following
3-sigma magnitude upper limits:
Filter T_range(s) Exp(s) 3sigUL(mag)
V 83-283 200 19.4
V 83-7768 869 20.5
B 290-7213 718 21.4
U 615-6955 301 20.4
UVW1 591-8168 550 20.8
UVM2 567-7972 490 20.8
UVW2 519-7604 278 21.2
White 494-7359 236 20.7
Reported times are in seconds since the BAT trigger.
These magnitudes are uncorrected for the expected
Galactic extinction corresponding to E(B-V) = 0.407.
GCN Circular 4772
Subject
GRB 060211B: Skynet Observations
Date
2006-02-17T21:16:27Z (20 years ago)
From
Chelsea Louise MacLeod at UNC-Chapel Hill/PROMPT <chelseam@physics.unc.edu>
C. MacLeod, A. Trotter, M. Nysewander, A. LaCluyze, D. Reichart, J.
Harvey, J. A. Crain, A. Foster, K. Ivarsen, J. Haislip, J. Kirschbrown, and
J. Carpenter report on behalf of the UNC team of the FUN GRB collaboration:
Skynet observed the localization of GRB 060211B (Mateos et al., GCN 4739)
with three of the 16-inch PROMPT telescopes at CTIO and with 14.5-inch TTT
in Colorado beginning 9.3 hours after the burst:
Filter Telescope Start (UT) Stop (UT) Exposures Total (hr)
B PROMPT-2 01:08:23 04:41:04 141 x 80s 3.13
r' PROMPT-4 01:08:26 04:41:08 84 x 80s 1.87
I PROMPT-1 01:08:23 04:41:11 140 x 80s 3.11
i' PROMPT-4 02:34:32 04:00:09 56 x 80s 1.24
Green* TTT 05:26:17 06:49:00 18 x 160s 0.80
Blue TTT 06:51:41 07:44:41 12 x 160s 0.53
* Approximates V band
No new source is found to I > 20.5 mag (3 sigma; calibrated to five
USNO-B1.0 stars).
GCN Circular 4766
Subject
GRB 060211b: WIRO NIR Observations
Date
2006-02-16T06:12:35Z (20 years ago)
From
Jay Norris at NASA-GSFC/LHEA <jnorris@lheapop.gsfc.nasa.gov>
J. Norris, A. Kutyrev (NASA/GSFC), R. Ganguly, R. Canterna,
and M. Pierce (U. Wyoming) report:
We observed the refined XRT error circle reported by Page et al. (GCN 4745)
for GRB 060211a (Swift trigger #181156; Mateos et al., GCN 4739; Tueller
et al., GCN 4747) with the 2.3-meter WIRO telescope.
Observations commenced at 2006/02/12 03:35 UT (11.7 hrs after the burst)
and continued until 04:15 UT. We obtained twenty 100-s integrations of
the target region in the J band under poor seeing conditions. In the
stacked image, no source was detected within or near the XRT error circle
to a limit of J = 19.2 (3-sigma upper limit).
GCN Circular 4759
Subject
GRB060211B: REM optical and NIR observations
Date
2006-02-14T00:21:31Z (20 years ago)
From
Paul Ward at Dunsink Obs <pward@halley.dunsink.dias.ie>
P. Ward, L. A. Antonelli, E. Molinari, G. Chincarini, F.M. Zerbi, S.
Covino,
V. Testa, G. Tosti, F. Vitali, P. Conconi, G. Cutispoto, G. Malaspina,
L. Nicastro,
E. Palazzi, E. Meurs, P. Goldoni, on behalf of the REM/ROSS team,
report:
The field of GRB 060211B (Mateos et al. GCN 4739) was imaged by the REM
telescope located in La Silla (Chile).
The field was observed with the REMIR near infrared camera in the J, H,
K' filters and ROSS in the V, R, I filters, starting on Feb. 12, at 00:30
UT, approximately 8.5 hrs after the burst.
No sources are detected within the refined XRT error circle (Page et al.,
GCN 4745) down to the limiting magnitudes of J=16.4, H=16.2, K=13.9,
V=17.1, R=18.1, I=17.3 (3-sigma upper limits).
This message is citeable.
GCN Circular 4758
Subject
GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
Date
2006-02-13T18:48:00Z (20 years ago)
From
Hans Krimm at NASA-GSFC <krimm@milkyway.gsfc.nasa.gov>
A. Parsons (GSFC), L. Barbier (GSFC),S. Barthelmy (GSFC),
J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
D. Palmer (LANL), T. Sakamoto (GSFC/ORAU), G. Sato (ISAS),
J. Tueller (GSFC), on behalf of the Swift-BAT team:
We have now reviewed the recently downloaded GRB 060211B data for the
T+122 s to T+300 s interval and find no additional burst activity
beyond T+122 s. The temporal and spectral fits values given in GCN 4747
(J. Tueller et al.) have not changed.
GCN Circular 4752
Subject
GRB 060211b: P60 Observations
Date
2006-02-12T19:53:53Z (20 years ago)
From
S. Bradley Cenko at Caltech <cenko@srl.caltech.edu>
S. B. Cenko, E. O. Ofek, A. M. Soderberg (Caltech) and D. B. Fox (Penn
State) report on behalf of a larger collaboration:
We have imaged the field of GRB060211b (Mateos et al., GCN 4739) with the
automated Palomar 60-inch telescope. Our observations were taken in the R
and i' filters at a mean epoch of approximately Feb. 12.21 UT. Inside the
revised XRT error circle (Page et al., GCN 4745) we find no sources. The
limiting magnitude of our observations, calculated with respect to the
USNOB R and I filters, is approximately R,I > 21.0.
GCN Circular 4747
Subject
GRB 060211B: Swift/BAT refined analysis
Date
2006-02-11T23:52:58Z (20 years ago)
From
Hans Krimm at NASA-GSFC <krimm@milkyway.gsfc.nasa.gov>
J. Tueller (GSFC), L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU),
G. Sato (ISAS), on behalf of the Swift-BAT team:
Using the data set from T-61 to T+122 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 060211
(trigger #181156) (Mateos, et al., GCN 4739). The BAT
ground-calculated position is (RA,Dec) = 75.076, 14.954 deg
{5h 0m 18.2s, 14d 57' 14.5"} (J2000) +- 2.0 arcmin, (radius, sys+stat,
90% containment). The partial coding was 82%.
The mask-tagged light curve shows a multi-peak structure with possible
extended emission. The burst started at T-12 sec with a small peak, then a
4-sec long peak at T+0 that decays out to ~T+10 sec and low-level
emission out to T+20 sec. Additionally, there is a possible 10-sec wide weak
peak centered on T+100 sec and a possible faint precursor at T-22 sec.
T90 (15-350 keV) is (29 +- 5) sec (estimated error including systematics).
Since we do not have data past T+122 sec, we cannot say at this time anything
about the extended lightcurve. We expect that it will take at least
a day to get that data downlinked.
The time-averaged spectrum from T-11.0 to T+21.7 is best fit by
a simple power-law model. The power law index of the time-averaged spectrum
is 1.55 +- 0.21. The fluence in the 15-150 keV band is
(4.7 +- 0.6) x 10^-07 erg/cm2. The 1-sec peak photon flux measured from
T+1.84 sec in the 15-150 keV band is (0.7 +- 0.1) ph/cm2/sec.
All the quoted errors are at the 90% confidence level.
GCN Circular 4745
Subject
GRB 060211B: Swift-XRT Team refined analysis
Date
2006-02-11T22:52:30Z (20 years ago)
From
Kim Page at U.of Leicester <kpa@star.le.ac.uk>
K.L. Page, E. Rol, A.P. Beardmore (U Leicester) and A.J. Levan (U.
Hertfordshire) report on behalf of the Swift XRT team:
Analysing the first three orbits of data (28 s in Windowed Timing mode and
6.4 ks in Photon Counting mode), the following refined position for the
X-ray afterglow was determined:
RA(J2000) = 05h 00m 17.2s
Dec(J2000) = +14d 56' 58.9"
with an estimated uncertainty of 3.9 arcsec (90% containment). This is
31.6 arcsec from the on-board BAT position reported in GCN 4739 and 1.9
arcsec from the XRT position given in GCN 4743.
The light-curve shows a steep initial decay of 2.09 +/- 0.23, flattening
to a slope of 0.62 +/- 0.23 towards the end of the first orbit (at 811 +/-
373 seconds after the trigger).
The spectrum obtained for the first orbit of data (118 - 2380 s
post-trigger) can be fitted with a power-law of photon index Gamma = 1.54
+/- 0.27, assuming a Galactic column of 1.9e21 cm^-2; there is no evidence
for excess NH in these data. Over this time span, the mean 0.3-10 keV
observed (unabsorbed) flux is 4.1e-12 (4.9e-12) erg cm^-2 s^-1.
Assuming the current decay slope of 0.62 continues, and using the spectral
fit to the first orbit of data, the XRT count rate is predicted to be
0.002 at 24 hours, corresponding to an observed (unabsorbed) flux of
8.0e-14 (9.7e-14) erg cm^-2 s^-1. However, taking into account the
uncertainty in the decay slope, the observed flux at 24 hours could range
between (0.3 - 2.4)e-13 erg cm^-2 s^-1.
This circular is an official product of the Swift-XRT Team.
GCN Circular 4744
Subject
GRB060211b: optical observation
Date
2006-02-11T21:27:22Z (20 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
R. Salyamov, M. Ibrahimov, (MAO), A. Pozanenko (IKI), V. Rumyantsev (CrAO)
on behalf of larger GRB follow up collaboration report:
We observed the error box of GRB060211b (Mateos et al., GCN 4739) with
1.5m telescope of Maidanak Astronomical Observatory. We started the
observation on Jan. 11 (UT) 16:15:54 (i.e. 20.7 minutes after GRB) and took
a series of 300 sec frames in R-band. In a first frame of 300 s exposure we
do net reveal any optical source within refined XRT error circle (Kennea et
al., GCN 4743). The limiting magnitude of the first frame is 19.3R as
calibrated against USNO B1.0. Further analysis is underway.
This message may be cited
GCN Circular 4743
Subject
GRB060211B: Swift/XRT position
Date
2006-02-11T19:03:48Z (20 years ago)
From
Jamie A. Kennea at PSU/Swift-XRT <kennea@astro.psu.edu>
J. A. Kennea (PSU), K. Page and C. Hurkett (U. Leicester) report on behalf
of the Swift/XRT Team:
We have performed a preliminary analysis of Swift/XRT ground-linked data
for GRB060211B (Mateos et al., GCN 4739). We find a uncatalogued, fading
source at the following location:
RA(J2000): 05:00:17.2
Dec(J2000): +14:56:57.1
with an estimated uncertainty of 6 arcseconds (90% containment). This
position lies 33 arcseconds from the BAT position reported in GCN 4739. A
full analysis of the XRT data will follow.
GCN Circular 4739
Subject
GRB 060211B: Swift-BAT detection of a burst
Date
2006-02-11T16:23:22Z (20 years ago)
From
Scott Barthelmy at NASA/GSFC <Scott@lheamail.gsfc.nasa.gov>
S. Mateos (U Leicester), S. Barthelmy (GSFC), N. Gehrels (GSFC),
O. Godet (U Leicester), C. Hurkett (U Leicster), J. Kennea (PSU),
H. Krimm (GSFC/USRA), F. Marshall (GSFC), J. Osborne (U Leicester),
K. Page (U Leicester), D. Palmer (LANL)
on behalf of the Swift team:
At 15:55:15 UT, Swift-BAT triggered and located GRB 060211B (trigger=181156).
The spacecraft slewed immediately. The BAT on-board calculated location is
RA,Dec 75.069d,+14.958d {05h 00m 17s,+14d 57' 27"} (J2000), with an uncertainty
of 3 arcmin (radius, 90% containment, stat+sys). The BAT light curve shows
two main peaks starting about 10 sec before the trigger and extending to T+15sec,
with a total duration of ~30 sec. The peak count rate was ~1000 counts/sec
(15-350 keV), at ~0 seconds at the trigger.
The XRT began taking data at 15:56:38 UT, 83 seconds after the BAT trigger.
The XRT on-board centroid algorithm did not converge and no prompt position
is available. The lightcurve shows evidence of a fading source. We are
waiting for down-linked data to detect and determine a position for the source.
UVOT took a finding chart exposure of 200 seconds with the V filter starting
84 seconds after the BAT trigger. No afterglow candidate has been found in the
initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error
circle. The typical 3-sigma upper limit has been about 18th mag. The 8'x8'
region for the list of sources generated on-board covers 100% of the BAT error
circle. The list of sources is typically complete to about 18.0 mag.
No correction has been made for the expected extinction of about 1.4 magnitudes.