- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sun 01 Feb 09 17:47:31 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 341749, Seg_Num: 0
GRB_RA: 92.031d {+06h 08m 07s} (J2000),
92.094d {+06h 08m 23s} (current),
91.685d {+06h 06m 44s} (1950)
GRB_DEC: -46.586d {-46d 35' 10"} (J2000),
-46.588d {-46d 35' 17"} (current),
-46.577d {-46d 34' 38"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 6992 [cnts] Image_Peak=180 [image_cnts]
TRIGGER_DUR: 1.024 [sec]
TRIGGER_INDEX: 155 E_range: 50-350 keV
BKG_INTEN: 36092 [cnts]
BKG_TIME: 64011.53 SOD {17:46:51.53} UT
BKG_DUR: 8 [sec]
GRB_DATE: 14863 TJD; 32 DOY; 09/02/01
GRB_TIME: 64022.73 SOD {17:47:02.73} UT
GRB_PHI: -50.28 [deg]
GRB_THETA: 46.53 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 32.77 [sigma]
IMAGE_SIGNIF: 7.91 [sigma]
MERIT_PARAMS: +1 +0 +0 +0 +3 +20 +0 +0 +26 +0
SUN_POSTN: 315.47d {+21h 01m 54s} -16.91d {-16d 54' 34"}
SUN_DIST: 105.46 [deg] Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN: 23.66d {+01h 34m 38s} +15.49d {+15d 29' 14"}
MOON_DIST: 87.17 [deg]
MOON_ILLUM: 37 [%]
GAL_COORDS: 253.97,-26.50 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 94.08,-70.00 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Coordinates.
COMMENTS: This is a rate trigger.
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 141.12,16.29 [deg].
- red DSS finding chart
ps-file
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sun 01 Feb 09 17:50:47 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 341749, Seg_Num: 0
GRB_RA: 92.031d {+06h 08m 07s} (J2000),
92.094d {+06h 08m 23s} (current),
91.685d {+06h 06m 44s} (1950)
GRB_DEC: -46.586d {-46d 35' 10"} (J2000),
-46.588d {-46d 35' 17"} (current),
-46.577d {-46d 34' 38"} (1950)
GRB_DATE: 14863 TJD; 32 DOY; 09/02/01
GRB_TIME: 64022.73 SOD {17:47:02.73} UT
TRIGGER_INDEX: 155
GRB_PHI: -50.28 [deg]
GRB_THETA: 46.53 [deg]
DELTA_TIME: 0.00 [sec]
TRIGGER_DUR: 1.024 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 32.77 [sigma]
IMAGE_SIGNIF: 7.91 [sigma]
LC_URL: sw00341749000msb.lc
SUN_POSTN: 315.48d {+21h 01m 54s} -16.91d {-16d 54' 32"}
SUN_DIST: 105.46 [deg] Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN: 23.69d {+01h 34m 45s} +15.50d {+15d 29' 56"}
MOON_DIST: 87.16 [deg]
MOON_ILLUM: 37 [%]
GAL_COORDS: 253.97,-26.50 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 94.08,-70.00 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Lightcurve.
COMMENTS:
COMMENTS: The next comments were copied from the BAT_POS Notice:
COMMENTS: This is a rate trigger.
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 141.12,16.29 [deg].
- GCN Circular #8865
S. R. Oates (UCL-MSSL), S. D. Barthelmy (GSFC),
W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester),
O. Godet (U Leicester), S. T. Holland (CRESST/USRA/GSFC),
F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester),
D. M. Palmer (LANL), P. Schady (MSSL-UCL) and H. Ziaeepour (UCL-MSSL)
report on behalf of the Swift Team:
At 17:47:02 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 090201 (trigger=341749). Swift could not immediately slew
due to the Earth limb constraint. The BAT on-board calculated location is
RA, Dec 92.031, -46.586 which is
RA(J2000) = 06h 08m 07s
Dec(J2000) = -46d 35' 10"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a multiple-peaked
structure with a duration of about 110 sec. The peak count rate
was ~10000 counts/sec (15-350 keV), at ~7 sec after the trigger.
Due to an observing constraint, Swift will not slew until
T0+45.3 minutes. There will be no XRT or UVOT data until
this time.
Burst Advocate for this burst is S. R. Oates (sro AT mssl.ucl.ac.uk).
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.)
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sun 01 Feb 09 18:37:12 UT
NOTICE_TYPE: Swift-XRT Nack-Position
TRIGGER_NUM: 341749, Seg_Num: 0
POINT_RA: 92.042d {+06h 08m 10s} (J2000)
POINT_DEC: -46.577d {-46d 34' 36"} (J2000)
IMG_START_DATE: 14863 TJD; 32 DOY; 09/02/01
IMG_START_TIME: 66858.58 SOD {18:34:18.58} UT, 2835.8 [sec] since BAT Trigger Time
COUNTS: 378 Min_needed= 20
STD_DEV: 0.00 Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER: 4 Max_iter_allowed= 4
ERROR_CODE: 2
COMMENTS: SWIFT-XRT Nack Position.
COMMENTS: Algorithm did not converge; too many iterations.
- GCN Circular #8866
B. E. Schaefer (Louisiana State) reports on behalf of the ROTSE
collaboration:
ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia,
responded to GRB 090201 (Swift trigger 341749; S. R. Oates et al., GCN
8865), producing images beginning 41 minutes after the burst trigger.
Weather constraints in Namibia were the cause of the delay, as we had to
await the clearing of the skies. Our first image was at 18:28:03.6 UT,
2460.9 s after the burst, under fair conditions. We took 10 5-sec, 10
20-sec and -8 60-sec exposures. These unfiltered images are calibrated
relative to USNO A2.0 (R). Imaging is on going.
Comparison to the DSS (second epoch) reveals no new sources within the
3-sigma Swift/BAT error circle, for both single images and coadding into
sets of 10; the field is not crowded. Swift has not slewed to this burst
yet, so there is no XRT position to examine in detail. Individual images
have limiting magnitudes ranging from 16.6-17.4; we set the following
specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
18:28:03.6 18:29:03.6 60 16.6 2460.9 N
18:28:03.6 18:30:15.5 131 16.9 2460.9 Y
18:42:25.4 18:54:11.1 705 18.2 3322.7 Y
- GCN Circular #8868
A.P. Beardmore and K.L. Page (U. Leicester) report on behalf of the
Swift-XRT team :
The Swift-XRT started observing the field of GRB 090201 (Oates et al,
GCN Circ. 8865) in photon counting mode at 18:50:40.7UT, 63.6 minutes
after the trigger. In 1.4 ks of promptly downlinked data we detect
a source at a position of RA, Dec = 92.0530, -46.5888, which is
RA (J2000) = 06h 08m 12.74s
Dec (J2000) = -46d 35m 19.8s
with an uncertainty of 3.5 arcsec (radius, 90% containment). The source is
55.5 arcsec from the reported BAT position and within its error circle.
We do not have sufficient data at this stage to tell if the source is
fading.
- GCN Circular #8869
P. D'Avanzo, C. C. Thoene, D. Fugazza (INAF-OAB), V. D'Elia (INAF-OAR),
S. Covino, S. Campana (INAF-OAB), G. Chincarini (Univ. Bicocca) report,
on behalf of the MISTICI collaboration:
We observed the field of GRB 090201 (Oates et a., GCN 8865) with the
ESO-VLT in imaging mode starting about 7.5 hours after the burst.
Observations were carried out in R and I-band with the FORS2 camera.
At the edge of the XRT error circle (Beardmore et al. GCN 8868) we find
a very faint source at the following coordinates (J2000):
R.A. = 06:08:12.92
Dec. = -46:35:17.3
+/- 0.3"
Preliminary photometry of this candidate afterglow gives R ~ 25.2 and I
~ 24.1. Further observations are ongoing.
We acknowledge the VLT staff for their support, in particular E. Valenti
and J. Smoker.
- GCN Circular #8870
W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),
E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
C. B. Markwardt (GSFC/UMD), S. R. Oates (UCL-MSSL), D. M. Palmer (LANL),
T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU),
J. Tueller (GSFC), T. N. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+363 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 090201 (trigger #341749)
(Oates, et al., GCN Circ. 8865). The BAT ground-calculated position is
RA, Dec = 92.051, -46.604 deg, which is
RA(J2000) = 06h 08m 12.3s
Dec(J2000) = -46d 36' 16.1"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 8%.
The mask-weighted light curve shows two clusters of overlapping peaks.
The first starting at ~T-20 sec and peaking at ~T+8 sec. The second peaks
at ~T+39 sec and ends at ~T+120 sec. T90 (15-350 keV) is 83 +- 4 sec
(estimated error including systematics).
The time-averaged spectrum from T-10.2 to T+102.2 sec is best fit by a power law
with an exponential cutoff. This fit gives a photon index 0.88 +- 0.18,
and Epeak of 104 +- 16 keV (chi squared 39.5 for 56 d.o.f.). For this
model the total fluence in the 15-150 keV band is 3.0 +- 0.1 x 10^-5 erg/cm2
and the 1-sec peak flux measured from T+7.60 sec in the 15-150 keV band is
14.7 +- 1.0 ph/cm2/sec. A fit to a simple power law gives a photon index
of 1.50 +- 0.04 (chi squared 76.3 for 57 d.o.f.). All the quoted errors
are at the 90% confidence level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/341749/BA/
- GCN Circular #8871
P. D'Avanzo, C. C. Thoene, D. Fugazza (INAF-OAB), V. D'Elia, S.
Piranomonte (INAF-OAR), R. Salvaterra, S. Covino, S. Campana (INAF-OAB),
G. Chincarini (Univ. Bicocca) report, on behalf of the MISTICI
collaboration:
We continued observing the field of GRB 090201 (Oates et a., GCN 8865)
with the ESO-VLT in imaging mode with the ISAAC NIR camera. Observations
were carried out in J, H and K-band about 9.5 hours after the burst.
The optical afterglow candidate (D'Avanzo et al. GCN 8869) is not
visible in the coadded images down to the following upper limits (3sigma
c.l.): J = 23.0, H = 22.4, K = 21.1 (calibrated against the 2MASS
catalogue).
The absence of a NIR detection suggests that the object observed by
D'Avanzo et al. (GCN 8869) is not the optical afterglow of GRB 090201
but probably a field galaxy. Further analysis is in progress.
We acknowledge the VLT staff for their support, in particular E. Valenti
and J. Smoker.
- GCN Circular #8872
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)
report on behalf of the Swift-XRT team.
Using 3196 s of XRT Photon Counting mode data and 8 UVOT
images for GRB 090201, we find an astrometrically corrected X-ray
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 92.05202, -46.59045 which is equivalent
to:
RA (J2000): 06h 08m 12.48s
Dec (J2000): -46d 35' 25.6"
with an uncertainty of 1.4 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position
can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is
described by Goad et al. (2007, A&A, 476, 1401
http://www.swift.ac.uk/xrt_positions/Goad.pdf), the current algorithm is an
extension of this method.
This circular was automatically generated, and is an official product of the
Swift-XRT team.
- GCN Circular #8873
P. D'Avanzo, C. C. Thoene, D. Fugazza (INAF-OAB), V. D'Elia, S.
Piranomonte (INAF-OAR), R. Salvaterra, S. Covino, S. Campana (INAF-OAB),
G. Chincarini (Univ. Bicocca) report, on behalf of the MISTICI
collaboration:
Following the enhanced XRT position (Beardmore et al. GCN 8872) we
re-analyzed our VLT optical and NIR images of the field of GRB 090201
(D'Avanzo et al. GCNs 8869, 8871). We find an object at the following
coordinates (J2000):
R.A. = 06:08:12.48
Dec. = -46:35:24.2
+/- 0.5"
consistent with the enhanced XRT position. Preliminary photometry of
this object gives R ~ 24.6 and J ~ 21.8. The moderate red color suggests
that this object likely is the afterglow of
GRB 090201.
Further observations are ongoing.
- GCN Circular #8874
P. Schady (MSSL-UCL) and S. Oates (MSSL-UCL) report on behalf of the
Swift UVOT team
The Swift/UVOT began settled observations of the field of GRB 090201
3668s after the BAT trigger (Oates et al., GCN 8865). We do not detect
any source at the enhanced Swift XRT position (Beardmore et al. GCN
8872) or at the VLT optical and NIR afterglow candidate (D'Avanzo et
al. GCN 8873) down to the following 3-sigma upper limits:
Filter T_start(s) T_stop(s) Exp(s) Mag (3-sigma upper limit)
-------------------------------------------------------------
White 3668 5051 344 > 21.53
v 3825 10589 1159 > 20.63
b 4646 16906 834 > 21.38
u 4440 16245 1082 > 21.15
uvw1 4235 14730 448 > 20.16
uvm2 4030 11123 717 > 20.53
uvw2 5056 5256 197 > 20.03
The quoted upper limits have not been corrected for the expected
Galactic extinction along the line of sight of E_(B-V) = 0.07 mag. All
photometry is on the UVOT photometric system described in Poole et al.
(2008, MNRAS, 383, 627).
- GCN Circular #8875
A.P. Beardmore, K.L. Page (U. Leicester), S.R. Oates (UCL-MSSL) report on
behalf of the Swift-XRT team.
The Swift-XRT started observing the BAT GRB 090201 (trigger #341749,
Oates et al., GCN circ. 8865) at 18:47:33 UT, 3.65ks after the trigger.
The UVOT-enhanced X-ray position has been reported in Beardmore et al.
(GCN Circ. 8872).
Using 14.5ks of photon counting mode data taken from T+3.65ks to T+39.2ks
after the trigger, we find the X-ray light curve can be described by a
broken powerlaw, with initial decay slope of 0.64 +0.17 -0.15, break time
of 7.2 +2.1 -1.5 ks and final decay slope of 1.45 +/- 0.11.
The spectrum spanning the same interval can be fit by an absorbed
powerlaw, with a photon index of 2.20 +/- 0.10 and column density of
4.78 +/- 0.42 x 10^21 cm^-2, compared with the Galactic column of 4.9
x 10^20 cm^-2 in the direction of the burst. The observed (unabsorbed)
0.3-10 keV flux is (1.00 +/- 0.06) x 10^-11 [(2.02+/-0.12) x 10^-11]
erg cm^-2 s^-1.
Assuming the decay continues at the same rate, we predict a count rate
of 0.017 count/s 1 day after the trigger, which corresponds to an observed
0.3-10 keV flux of 7.4e-13 erg cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.
- GCN Circular #8878
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P.
Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind
team, report:
The long GRB 090201 (Swift-BAT trigger #341749: Oates et al., GCN
8865; Baumgartner et al., GCN 8870)
triggered Konus-Wind at T0=64020.275 s UT (17:47:00.275).
The burst light curve shows a multipeaked structure with a duration of
~110 s.
As observed by Konus-Wind the burst
had a fluence of 6.72(-0.54, +0.47)x10^-5 erg/cm2,
and a 64-ms peak flux measured from T0+11.728 s
of 7.30(-1.28, +1.24)x10^-6 erg/cm2/s
(both in the 20 keV - 2 MeV energy range).
The time-integrated spectrum of the burst
(from T0 to T0+107.520 s) is well fitted (in the 20 keV - 2 MeV
range) by GRB (Band) model for which:
the low-energy photon index is alpha = -0.97(-0.09, +0.10),
the high energy photon index beta = -2.80(-0.92, +0.29),
the peak energy Ep = 158(-12, +13) keV (chi2 = 51.0/59 dof).
All the quoted errors are at the 90% confidence level.
The Konus-Wind light curve of this GRB is available
at http://www.ioffe.ru/LEA/GRBs/GRB090201_T64020/
- GCN Report 197.1
GCN_Report 197.1 has been posted:
http://gcn.gsfc.nasa.gov/reports/report_197_1.pdf
by S.R. Oates
at MSSL-UCL
titled: "Final Swift Observations of GRB 090201"
- GCN Circular #8955
Aquib Moin (Curtin Institute of Radio Astronomy / Australia Telescope
National Facility), Steven Tingay (Curtin Institute of Radio Astronomy),
Chris Phillips (Australia Telescope National Facility), Gregory Taylor
(University of New Mexico), Mark Wieringa (Australia Telescope National
Facility) and Ralph Martin (Perth Observatory) report:
We observed the VLT position of the GRB090201 optical afterglow (GCN
8873) at 4.800 and 4.928 GHz with the Australia Telescope Compact Array
(ATCA) between 01:00:00 UT and 22:00:00 UT on February 21/22, 2009.
We did not detect a radio source at the optical afterglow position of
the GRB090201 (GCN 8873). The data at 4.800 and 4.928 GHz were merged
and the radio flux density at the afterglow position found out to be
-0.430 +/- 0.280 mJy/beam (1-sigma).
The Australia Telescope Compact Array (/ Parkes telescope / Mopra
telescope / Long Baseline Array) is part of the Australia Telescope
which is funded by the Commonwealth of Australia for operation as a
National Facility managed by CSIRO.
See the 4.800 & 4.928 GHz combined image at:
http://cira.ivec.org/dokuwiki/doku.php/grb/grb090201/grb090201_field_image
- arXiv:1505.06743
X-shooter redshift: 2.100
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