Gamma-ray Burst 090129

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 29 Jan 09 21:07:32 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     254956037
GRB_RA:          264.617d {+17h 38m 28s} (J2000),
                 264.771d {+17h 39m 05s} (current),
                 263.765d {+17h 35m 03s} (1950)
GRB_DEC:         -37.383d {-37d 22' 59"} (J2000),
                 -37.388d {-37d 23' 16"} (current),
                 -37.355d {-37d 21' 17"} (1950)
GRB_ERROR:       7.13 [deg radius, statistical plus systematic]
GRB_INTEN:       367 [cnts/sec]
DATA_SIGNIF:     18.40 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        14860 TJD;    29 DOY;   09/01/29
GRB_TIME:        76035.42 SOD {21:07:15.42} UT
GRB_PHI:         312.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.86
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      86%  GRB
2nd_MOST_LIKELY:   6%  Generic Transient
DETECTORS:       0,0,0, 1,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       312.55d {+20h 50m 12s}  -17.71d {-17d 42' 44"}
SUN_DIST:         46.10 [deg]   Sun_angle= 3.2 [hr] (West of Sun)
MOON_POSTN:      349.71d {+23h 18m 50s}   -0.64d {-00d 38' 21"}
MOON_DIST:        85.59 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      352.03, -3.18 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      265.59,-14.03 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 150.88,16.35 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 29 Jan 09 21:07:31 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     341504,   Seg_Num: 0
GRB_RA:          269.092d {+17h 56m 22s} (J2000),
                 269.241d {+17h 56m 58s} (current),
                 268.272d {+17h 53m 05s} (1950)
GRB_DEC:         -32.826d {-32d 49' 32"} (J2000),
                 -32.827d {-32d 49' 35"} (current),
                 -32.819d {-32d 49' 09"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1888 [cnts]    Image_Peak=181 [image_cnts]
TRIGGER_DUR:     0.256 [sec] 
TRIGGER_INDEX:   123     E_range: 25-100 keV
BKG_INTEN:       33824 [cnts]
BKG_TIME:        76019.54 SOD {21:06:59.54} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14860 TJD;    29 DOY;   09/01/29
GRB_TIME:        76035.28 SOD {21:07:15.28} UT
GRB_PHI:         -129.16 [deg]
GRB_THETA:        18.11 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     24.12 [sigma]
IMAGE_SIGNIF:    11.36 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2 +19 -100  +1 -74  +0 
SUN_POSTN:       312.55d {+20h 50m 12s}  -17.71d {-17d 42' 44"}
SUN_DIST:         41.63 [deg]   Sun_angle= 2.9 [hr] (West of Sun)
MOON_POSTN:      349.71d {+23h 18m 50s}   -0.64d {-00d 38' 21"}
MOON_DIST:        81.65 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      357.83, -3.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      269.23, -9.39 [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 = 182.07,-6.40 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=254956037).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 29 Jan 09 21:07:53 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     254956037
GRB_RA:          264.733d {+17h 38m 56s} (J2000),
                 264.888d {+17h 39m 33s} (current),
                 263.881d {+17h 35m 32s} (1950)
GRB_DEC:         -37.350d {-37d 21' 00"} (J2000),
                 -37.355d {-37d 21' 15"} (current),
                 -37.322d {-37d 19' 20"} (1950)
GRB_ERROR:       6.82 [deg radius, statistical plus systematic]
GRB_INTEN:       268 [cnts/sec]
DATA_SIGNIF:     25.30 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        14860 TJD;    29 DOY;   09/01/29
GRB_TIME:        76035.42 SOD {21:07:15.42} UT
GRB_PHI:         312.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.07
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      56%  SGR_1806n20
2nd_MOST_LIKELY:  29%  GRB
DETECTORS:       0,0,0, 1,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       312.55d {+20h 50m 12s}  -17.71d {-17d 42' 44"}
SUN_DIST:         46.01 [deg]   Sun_angle= 3.2 [hr] (West of Sun)
MOON_POSTN:      349.71d {+23h 18m 51s}   -0.64d {-00d 38' 16"}
MOON_DIST:        85.50 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      352.11, -3.24 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      265.69,-13.99 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 150.88,16.35 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 29 Jan 09 21:10:45 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     341504,   Seg_Num: 0
GRB_RA:          269.092d {+17h 56m 22s} (J2000),
                 269.241d {+17h 56m 58s} (current),
                 268.272d {+17h 53m 05s} (1950)
GRB_DEC:         -32.826d {-32d 49' 32"} (J2000),
                 -32.827d {-32d 49' 35"} (current),
                 -32.819d {-32d 49' 09"} (1950)
GRB_DATE:        14860 TJD;    29 DOY;   09/01/29
GRB_TIME:        76035.28 SOD {21:07:15.28} UT
TRIGGER_INDEX:   123
GRB_PHI:         -129.16 [deg]
GRB_THETA:        18.11 [deg]
DELTA_TIME:      26.00 [sec]
TRIGGER_DUR:     0.256 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     24.12 [sigma]
IMAGE_SIGNIF:    11.36 [sigma]
LC_URL:          sw00341504000msb.lc
SUN_POSTN:       312.55d {+20h 50m 12s}  -17.71d {-17d 42' 42"}
SUN_DIST:         41.64 [deg]   Sun_angle= 2.9 [hr] (West of Sun)
MOON_POSTN:      349.73d {+23h 18m 56s}   -0.63d {-00d 37' 34"}
MOON_DIST:        81.68 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      357.83, -3.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      269.23, -9.39 [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 = 182.07,-6.40 [deg].

GCN Circular #8861
H. Ziaeepour (UCL-MSSL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), P.A. Curran (MSSL-UCL), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Guidorzi (U Ferrara), J. A. Kennea (PSU), N. P. M. Kuin (MSSL), C. B. Markwardt (CRESST/GSFC/UMD), P. T. O'Brien (U Leicester), C. Pagani (PSU), K. L. Page (U Leicester), B. A. Rowlinson (U Leicester), P. Schady (MSSL-UCL), M. Stamatikos (NASA/ORAU) and L. Vetere (PSU) report on behalf of the Swift Team:
At 21:07:15 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090129 (trigger=341504). The BAT on-board calculated location is RA, Dec 269.092, -32.826 which is
```
   RA(J2000) = 17h 56m 22s
   Dec(J2000) = -32d 49' 32"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a FRED-like structure with a duration of about 20 sec. The peak count rate was ~7000 counts/sec (15-350 keV), at ~1 sec after the trigger.
Due to an observing constraint, Swift cannot slew to the BAT position. There will thus be no XRT or UVOT data for this trigger until at least 03 Feb 2009.
Burst Advocate for this burst is H. Ziaeepour (hz 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 Circular #8862
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU), H. Ziaeepour (UCL-MSSL) (i.e. the Swift-BAT team):
Using the data set from T-120 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 090129 (trigger #341504) (Ziaeepour, et al., GCN Circ. 8861). The BAT ground-calculated position is RA, Dec = 269.105, -32.793 deg which is
```
   RA(J2000)  =  17h 56m 25.1s 
   Dec(J2000) = -32d 47' 34.8" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 89%.
The mask-weighted light curve shows emission starting at ~T-30 sec, then a large-amplitude FRED peak that returns to background at ~T+70 sec. T90 (15-350 keV) is 17.5 +- 2.7 sec (estimated error including systematics).
The time-averaged spectrum from T-0.2 to T+27.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.88 +- 0.06. The fluence in the 15-150 keV band is 2.1 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+1.00 sec in the 15-150 keV band is 3.7 +- 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/341504/BA/
GCN Report 195.1
GCN_Report 195.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_195_1.pdf by H. Ziaeepour at UCL/MSSL titled: "Final Swift Observations of GRB 090129"
GCN Circular #8897
S. Guiriec (UAH) reports on behalf of the Fermi GBM Team:
"At 21:07:15.42 UT on 29 January 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090129 (trigger 254956037 / 090129880) which was also detected by the SWIFT-BAT. The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 22 degrees.
The GBM light curve consists of a single peak with a FRED shape starting at ~T0-0.3s with a duration (T90) of about 17.2s (8-1000 keV). The time-averaged spectrum from T0-0.3s to T0+15.1s is well fitted by a Band function with Epeak = 123.2 +/- 44.8 keV, alpha = -1.39 +/- 0.13, and beta = -1.98 +/- 0.14 (chi squared 373 for 374 d.o.f.).
The event fluence (8-1000 keV) in this time interval is (5.6 +/- 0.7)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.8 s in the 8-1000 keV band is 8.0 +/- 0.1 ph/s/cm^2.
The spectral and temporal analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."

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Jochen Greiner, last update: 09-Feb-2009 [Disclaimer]