- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 08 Dec 09 08:46:23 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 378554, Seg_Num: 0
GRB_RA: 0.274d {+00h 01m 06s} (J2000),
0.402d {+00h 01m 37s} (current),
359.634d {+23h 58m 32s} (1950)
GRB_DEC: +65.674d {+65d 40' 25"} (J2000),
+65.729d {+65d 43' 44"} (current),
+65.395d {+65d 23' 43"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 5962 [cnts] Image_Peak=463 [image_cnts]
TRIGGER_DUR: 1.024 [sec]
TRIGGER_INDEX: 155 E_range: 50-350 keV
BKG_INTEN: 22064 [cnts]
BKG_TIME: 31546.67 SOD {08:45:46.67} UT
BKG_DUR: 8 [sec]
GRB_DATE: 15173 TJD; 342 DOY; 09/12/08
GRB_TIME: 31560.55 SOD {08:46:00.55} UT
GRB_PHI: -177.72 [deg]
GRB_THETA: 25.74 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 55.47 [sigma]
IMAGE_SIGNIF: 14.41 [sigma]
MERIT_PARAMS: +1 +0 +0 +0 +3 +3 +0 +1 +45 +0
SUN_POSTN: 255.22d {+17h 00m 53s} -22.74d {-22d 44' 30"}
SUN_DIST: 116.85 [deg] Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN: 158.19d {+10h 32m 45s} +5.17d {+05d 10' 17"}
MOON_DIST: 107.27 [deg]
MOON_ILLUM: 57 [%]
GAL_COORDS: 117.77, 3.31 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 41.49, 56.64 [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 = 356.27,17.84 [deg].
- red DSS finding chart
ps-file
- GCN NOTICE
TITLE: GCN/INTEGRAL NOTICE
NOTICE_DATE: Tue 08 Dec 09 08:47:00 UT
NOTICE_TYPE: INTEGRAL SPI ACS Trigger
TRIGGER_NUM: 5961, Sub_Num: 0
GRB_INTEN: 9.88 [sigma]
GRB_TIME: 31558.37 SOD {08:45:58.37} UT
GRB_DATE: 15173 TJD; 342 DOY; 09/12/08
COMMENTS: INTEGRAL SPI_ACS GRB Trigger.
COMMENTS: ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2009-12/2009-12-08T08-45-58.1605-00346-00007-0.lc
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 08 Dec 09 08:49:32 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 378554, Seg_Num: 0
GRB_RA: 0.274d {+00h 01m 06s} (J2000),
0.402d {+00h 01m 37s} (current),
359.634d {+23h 58m 32s} (1950)
GRB_DEC: +65.674d {+65d 40' 25"} (J2000),
+65.729d {+65d 43' 44"} (current),
+65.395d {+65d 23' 43"} (1950)
GRB_DATE: 15173 TJD; 342 DOY; 09/12/08
GRB_TIME: 31560.55 SOD {08:46:00.55} UT
TRIGGER_INDEX: 155
GRB_PHI: -177.72 [deg]
GRB_THETA: 25.74 [deg]
DELTA_TIME: 52.00 [sec]
TRIGGER_DUR: 1.024 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 55.47 [sigma]
IMAGE_SIGNIF: 14.41 [sigma]
LC_URL: sw00378554000msb.lc
SUN_POSTN: 255.22d {+17h 00m 53s} -22.74d {-22d 44' 31"}
SUN_DIST: 116.85 [deg] Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN: 158.22d {+10h 32m 52s} +5.16d {+05d 09' 29"}
MOON_DIST: 107.28 [deg]
MOON_ILLUM: 57 [%]
GAL_COORDS: 117.77, 3.31 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 41.49, 56.64 [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 = 356.27,17.84 [deg].
- GCN Circular #10253
E. A. Hoversten (PSU), P. A. Evans (U Leicester), C. Gronwall (PSU),
J. Mao (INAF-OAB), C. B. Markwardt (CRESST/GSFC/UMD),
P. T. O'Brien (U Leicester), K. L. Page (U Leicester),
D. M. Palmer (LANL), M. Stamatikos (OSU/NASA/GSFC) and L. Vetere (PSU)
report on behalf of the Swift Team:
At 08:46:00 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 091208 (trigger=378554). Swift could not slew to the burst
due to an Earth limb constraint. The BAT on-board calculated location is
RA, Dec 0.274, +65.674 which is
RA(J2000) = 00h 01m 06s
Dec(J2000) = +65d 40' 25"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a FRED
structure with a duration of about 30 sec. The peak count rate
was ~6000 counts/sec (15-350 keV), at ~0 sec after the trigger.
Due to an observing constraint, Swift will not slew until
T0+49.7 minutes. There will be no XRT or UVOT data until
this time.
Burst Advocate for this burst is E. A. Hoversten (hoversten AT astro.psu.edu).
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 Circular #10254
F. Yuan (U Mich), W. Rujopakarn (Steward), W. Zheng (U Mich), report
on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
091208 (Swift trigger 378554; E. A. Hoversten et al, GCN 10253),
producing images beginning 9.6 s after the GCN notice time. An
automated response took the first image at 08:46:30.5 UT, 30.0 s after
the burst. We took 10 5-sec and 42 20-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. Individual images have limiting magnitudes ranging
from 14.6-16.6; we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
08:52:40.1 08:57:21.5 281 17.3 399.6 Y
08:57:30.2 09:02:12.0 281 17.4 689.7 Y
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 08 Dec 09 09:38:19 UT
NOTICE_TYPE: Swift-XRT Nack-Position
TRIGGER_NUM: 378554, Seg_Num: 0
POINT_RA: 0.266d {+00h 01m 04s} (J2000)
POINT_DEC: +65.540d {+65d 32' 24"} (J2000)
IMG_START_DATE: 15173 TJD; 342 DOY; 09/12/08
IMG_START_TIME: 34689.15 SOD {09:38:09.15} UT, 3128.6 [sec] since BAT Trigger Time
COUNTS: 51 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 #10261
K.Noda, K.Kono, E.Sonoda, N.Ohmori, H.hayasi,
A.Daikyuji, Y.Nisioka, M.Yamauchi
(University of Miyazaki)
We have observed the field covering the error circle of
GRB GRB091208A (Swift trigger 378554, GCN 10253, Hoversten et al.)
with the unfiltered CCD camera on the 30-cm telescope
at University of Miyazaki.
The observation was started 09:04:56 UT, about 19 min
after the Swift trigger time.
We have compared our data of 30 sec exposures
with the USNO-A2.0 catalog,
There is no new source at the reported position.
the upper limits are as follows:
--------------------------------------------------------------
Start(UT) End(UT) Num. of frames Limit (mag.)
--------------------------------------------------------------
09:04:56 09:05:26 1 15.8
09:04:56 09:48:39 33 17.3
---------------------------------------------------------------
- GCN Circular #10264
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC),
E. A. Hoversten (PSU), H. A. Krimm (GSFC/USRA),
C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. M. Parsons (GSFC),
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-61 to T+242 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 091208A (trigger
#378554) (Hoversten, et al., GCN Circ. 10253). The BAT ground-
calculated position is RA, Dec = 0.295, 65.680 deg which is
RA(J2000) = 00h 01m 10.9s
Dec(J2000) = +65d 40' 47.7"
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 88%.
The mask-weighted light curve shows a single FRED with some additional
structure on the decaying side. The tail appears to be quite long at
low energy, with emission detectable for up to 200 seconds after the
trigger. T90 (15-350 keV) is 29.1 +- 2.5 sec (estimated error including
systematics).
The time-averaged spectrum from T-0.3 to T+32.8 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
0.81 +- 0.10. The fluence in the 15-150 keV band is 1.5 +- 0.1 x 10^-06
erg/cm2. The 1-sec peak photon flux measured from T+0.15 sec in the
15-150 keV band is 1.8 +- 0.2 ph/cm2/sec. 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/378554/BA/
- GCN Circular #10270
C. Pagani, L. Vetere (PSU), P.A. Evans (U. Leicester), J. L. Racusin
(NASA/GSFC) and E. A. Hoversten (PSU) report on behalf of the Swift Team:
Swift/XRT observed the field of GRB 091208A (BAT trigger number 378554;
Hoversten et al. GCN Circ. 10253) from 3.1 ks to 3.3 ks after the BAT
trigger and again from 25 ks to 27 ks after the BAT trigger. The first
observation was delayed due to an observing constraint.
During the first observation no X-ray afterglow is detected inside the BAT
error circle (Barthelmy et al. GCN Circ. 10264) in 180 seconds of Photon
Counting data. The corresponding 3-sigma upper limit is 0.04 counts/s.
For comparison, the median XRT count rate for long GRB afterglows at 3 ks
after the BAT trigger is approximately 0.1 counts/s.
During the second observation no X-ray afterglow is detected inside the BAT
error circle in 694 seconds of PC data. The corresponding 3-sigma upper
limit is 0.01 counts/s. For comparison, the median XRT count rate for long
GRB afterglows at 25 ks after the BAT trigger is approximately 0.02
counts/s. Based on the count rates of the XRT afterglows observed during
the Swift mission the chance of detecting a long GRB with the XRT in a 1 ks
observation 25 ks after the BAT trigger is 61%.
This circular is an official product of the Swift-XRT team.
- GCN Circular #10274
M. De Pasquale (MSSL/UCL) and E. Hoversten (PSU) report on the behalf of
the Swift team:
Swift/UVOT observed the field of GRB091208A from 4.32 ks to 4.33 ks after
the BAT trigger in the v filter and then from 26.01 to 26.71 ks after the
trigger in u, v and white filters. No new source is detected in the BAT
error circle (Barthelmy et al., GCN Circ. 10264). We caution though that
a small fraction of BAT error circle is not covered by UVOT exposures.
3 sigma upper limits on magnitudes are as follows:
Filter T_start(s) T_stop(s) Exp(s) Mag
v 4318 4328 10 >17.4
v 26513 26717 200 >19.4
wh 26261 26507 243 >21.1
u 26008 26255 243 >20.1
The values quoted above are on the UVOT Photometric System
(Poole et al., 2008, MNRAS 383,627). They are not corrected for
the expected strong Galactic extinction, corresponding to a reddening
of E(B-V)=1.6.
- GCN Circular #10276
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin,
P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf
of the Konus-Wind team, report:
The long GRB 091208A (Swift-BAT trigger #378554:
Hoversten et al., GCN 10253; Barthelmy et al., GCN 10264)
triggered Konus-Wind at T0=31563.038s UT (08:46:03.038).
The burst light curve shows a smooth single-pulse structure
with a total duration of ~30 s. The Konus-Wind light
curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB091208_T31563/
As observed by Konus-Wind the burst
had a fluence of 6.2(+/-1.0)x10-6 erg/cm2,
and a 256-ms peak flux measured from T0-0.256s
of 1.3(+/-0.2)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+24.832 s) can be fitted
in the 20 keV - 2 MeV range by a power law
with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), with
alpha = +0.24(-0.5, +0.7),
and Ep = 314(-50, +70) keV (chi2 = 74/61 dof).
The spectrum of the most intense part of the burst
(measured from T0 to T0+8.448 s) is well fitted
in the 20 keV - 2 MeV range by a power law
with exponential cutoff model, for which
alpha = +0.13(-0.4, +0.55),
and Ep = 316(-44, +60) keV (chi2 = 47/61 dof).
All the quoted results are preliminary.
All the quoted errors are at the 90% confidence level.
- GCN Circular #10277
K. Kinugasa, S. Honda, H. Takahashi, H. Taguchi, O. Hashimoto
(Gunma Astronomical Observatory) report:
The field of GRB 091208A (Hoversten et al. GCN 10253) was observed
with the 150 cm telescope of Gunma Astronomical Observatory. Starting
at 09:09:06 UT on Dec.8 ( 23.1 min after the trigger), both Rc and Ic
frames were acquired for sets of 5 x 0.5-min and 3 x 2-min exposures.
The limiting magnitude in combined image is estimated as Rc~20.5 and
Ic~20.0. We did not detect any new point source within the BAT error
circle down to the magnitudes of R~20.2 and I~19.5 relative to
USNO-B1.0 R2 and I magnitudes, respectively.
- GCN Circular #10278
Y. Nishioka, H. Hayashi, N. Ohmori, A. Daikyuji,E. Sonoda, K. Kono,
K. Noda, M. Yamauchi (Univ. of Miyazaki), T. Sugasahara, M. Tashiro,
Y. Terada, A. Endo, K. Onda, W. Iwakiri (Saitama U.), S. Sugita
(Nagoya U.), K. Yamaoka (Aoyama Gakuin U.), M. Ohno, M. Suzuki,
M. Kokubun, T. Takahashi (ISAS/JAXA), Y. E. Nakagawa, T. Tamagawa
(RIKEN), N. Vasquez (Tokyo Tech.), Y. Urata, H.M Lin (NCU),
Y. Hanabata, T. Uehara, T. Takahashi, Y. Fukazawa (Hiroshima U.),
T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Hong (Nihon U.),
on behalf of the Suzaku WAM team, report
The long GRB 091208A (Swift/BAT trigger #378554 ; Barthelmy et al.,
GCN 10264) triggered the Suzaku Wide-band All-sky Monitor (WAM) which
covers an energy range of 50 keV - 5 MeV at 2009-12-08 08:46:00.546 UT (=T0).
The observed light curve shows a single peak starting at T0 s,
ending at T0+10 s with a duration (T90) of about 6.6 seconds.
The fluence in 100 - 1000 keV was 4.85(-0.99, +0.65) x10^-6 erg/cm^2.
The 1-s peak flux measured from T0 s was 1.94 (-0.60, +0.61)
photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-0.5 s to
T0+10 s is well fitted by a single power-law with a photon index of
2.04 (-0.24, +0.28) (chi^2/d.o.f = 48.5/33).
All the quoted errors are at statistical 90% confidence level,
in which the systematic uncertainties are not included.
The light curves for this burst are available at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
- GCN Report 270.1
GCN_Report 270.1 has been posted:
http://gcn.gsfc.nasa.gov/reports/report_270_1.pdf
by E.A. Hoversten
at PSU
titled: "Final Swift Observations of GRB 091208A"
Previous IAU Circulars 