suzaku hxd-wam observations of gamma-ray prompt emission ... · hxd-wam bat lad energy range 50 –...
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Suzaku HXD-WAM Observationsof Gamma-ray Prompt Emissionand Collaboration with GLAST
Y. Fukazawa, M. Ohno, T. Takahashi, T. Asano, T. Uehara (Hiroshima U.), K. Yamaoka, S. Sugita (Aoyama-Gakuin), Y. Terada, T. Tamagawa, M. Suzuki (RIKEN), S. Hong (Nihon U), M. Tashiro, Y. Urata, K. Abe, K. Onda, M. Suzuki (Saitama U), E. Sonoda (Miyazaki U), M. Kokubun, T. Enoto, K. Makishima (U of Tokyo), T. Takahashi, K. Nakazawa (ISAS/JAXA) , G. Sato (NASA/GSFC) and the HXD-II team
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Suzaku Wideband All-sky Monitor (WAM)
thick (4cm) large (38cm)20 BGO crystals
Suzaku/HXD
top view cross-section 4cm 38cm
Anti for lowering the BGD of main detectorAll-sky monitor with high stopping
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cross section top view
Large effective area
Effective area : 800cm@300keV 400cm@1MeV
HXD-WAM
Effective area
Swift-BAT
Highest sensitivity from 300 to 5000 keV
GLAST-GBM
(BGO)
GLASTLAT
0.5sec 55ch (continuous) or 1/64sec 4ch (128s length)
WAM Advantage for GRB observations
Moderate time resolution
No alert system
100 1000 10000 (keV)
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GRB observations with WAM~Trigger status~
Lightcurve samples
GRB detection rate is ~120 / year
Short GRBs
Single peak
Multiple peak
22 Aug 2005 --- 07 Jan 2007
Localized GRB 26
Confirmed GRB 112
Possible GRB >30
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number(triggered)Swift 35 (15)Konus 88 (56)HETE-2 9 (4)INTEGRAL/SPI 31 (19)INTEGRAL/IBIS 2 (0)
GCN Circulars (as of 2006 Sep)WAM:9 GRB051008, GRB051111, GRB051221A, GRB060111B, GRB060117, GRB060429, GRB060813, GRB060814, GRB060904A
IPN :5 GRB060213,GRB060303,GRB060425,GRB060429,SGR1806-20(2)
Joint:1 GRB060813
Simultaneous Detectrion of GRBs with other satellites
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/
Light curves and Spectra are available at
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SGR (Soft Gamma-ray Repeater)SGR1806-20, 1900+14
Solar Flares>30 triggers (X,C-class)
Dec 01, 2005 SGR1806-20
Dec 05, 2006 X6.5
These data will be also useful with the GLAST data.
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Earth Occultation step by WAM
Crab occultation step
Time (sec)
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Crab CygX-1
GRO J1655-40 Cen A
100 500(keV)
Month/Year monitoring of soft-gamma-ray sources is available
Preliminary
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Side1
Side3
Side2
Side
0 Suzaku Mass ModelRI
move along this line
HXD-II(inside satellite)
511 keV count rate
Calibration
Ground calibtation
Geant 4
Inflight CalibrationCooperation with Swift, Konus-Wind by using the same GRBsCrab by the earth occultation
<30% accuracy for the response
SwiftWAM
Konus
WAM is located inside the satellte body.
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WAM
WAM
Good matiching with GLASTSimilar orbit (LEO, 30deg incl.)
Highest sensitivity around GRB peak
Same BGO detectorField of view
Depending on theSuzaku attitude
30% of GLAST GRBs may be Detected withWAM.
Collabo. in Calibration and BGD
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GRB results
1. Epeak distribution2. short GRBs vs long GRBs hardness, spectral delay…3. Spectral Evolution
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MeV emission is clearly detected from GRBs !
GRB051008GRB060213GRB060317
MeV emission !
1. Epeak Distribution toward the higher energy
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Swift
WAMKonus
Simultaneous fits with other satellites strongly constrain the spectral shape and then Epeak.
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Kolgomorov-Smilnov probability: ~15%
Selection effect ?
BATSEWAM
100 1000 10000(keV)
Comparison of Epeak dist.
It seems allmost similar ?
Still need more study.
More sampleHope with GLAST
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T90 distribution
T90 distributionshows bimodalstructure same as BATSE
2. Short GRBs vs Long GRBs
T90 (sec)
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We pick up 4 bright short GRBs (Konus, IPN).Constrained the Epeak accurately.
Epeak is constarined to be 1-5 MeV.
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Redshift-dep.
E iso
E peak
Long GRBs
Short GRBs
Different origin between short and long
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Long GRB Short GRB
Cross Correlation Function (CCF)
CCF CCF
0 2 4 (sec) 0 0.5 1 (sec)
TH0:50-110keVTH1:110-240TH2:240-520TH3:520-5000
TH0toTH1TH0toTH2TH0toTH3
Spectral lag
Spectral lag No spectral lag
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Short GRBs vs Long GRBs
duration
HR32
short long
100-300keV 50-100keV
Hardness Ratio
duration
short
Long
Lag
Spectral lag
index(α)
LongShort
Toward low energy
Energy index
Different physics of emission?Different Lorentz Factor?
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3.Spectral Evolution of GRBs~ variability upto MeV enegy band ~Spectral evolution upto MeV band from some GRBs
50-110keV
110-240keV
240-520keV
520-5000keV
GRB070125
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GRB051008Variable Epeak
GRB060213Constant Epeak
GRB060813Variable Epeak
Time since trigger(sec)
Epeak
lightcurve
Epeak Epeak
500
2000(keV)
500
2000
200
500
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Time resolved analysis
1 sec resolved analysisGRB 061007
Epeak(keV)
Lihgt Curve
Band α
Band β
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Most data satisfy Ep ∝ Liso 0.5
Outlier? Higher Ep?at the beginning of flares
Physical state transition?
Luminosity
Epeak
Epeak – Eiso scatter plot for the time-resolved data of GRB 061007
This will be important to constrain the physics of the central engine.
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GRB940217
Energy (keV)
WAM
102 103 104 (keV)
WAM
Expected science with GLAST
Smooth hard tail ?Cut-off + other tail?Epeak distribution?
Spectral evolution of the high energy tail.
WAM will give a good photon statistics around 100—5000 keV,to constrain the spectral shapeand trace the spectral evolution.
Emission mechanismSynchrotron?Hadron?
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Summary
Some detailed spectral and timing analyses are being available
Ep distribution is similar(broader?) as BATSE Different properties between Short and LongSpectral evolution .. etc
Collaboration with GLAST is hoped to open the new window for the high energy GRB emisson !
WAM observations of GRBs
WAM has been giving more accurate measurements of spectra and timing of prompt emission, following BATSE.
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II. WAM performance
Comparison with other GRB missions
Suzaku Swift BATSE HXD-WAM BAT LADEnergy range 50 – 5000 15 – 150 20 – 2000(keV)Energy resolution 30% **% 20% ( @662keV)Effective area 400 5000 150 Time resolution 31.25ms ** ms 2 ms
HXD-WAM is very useful for GRB observation in hard X-ray band complementary with Swift-BAT.
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100-300 keV Fluence distribution
BATSE 4B
WAM samples
Fluence (log) erg/cm2
WAM sample は、特に明るいものばかりというわけでもない(?)
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Observations
No problems on the hardware
From Aug 25 – 2005 to Nov 2006, WAM detected 160 self-triggerred GRBs and possible GRBs. (~100 per 1 year)
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III. Results and DiscussionA. Time averaged analysis
45個のうち、31個のGRBにおいて、simple PL よりもcutoffPL,Band model で fit 改善->Epeakを決めることができた
Long GRB 051008 Short GRB 060429
50sec 1sec
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IV. WAM+BAT joint analysis~ Epeak with WAM-BAT joint fitting ~
Many GRBs can be determined the Ep by joint fit with Swift/BAT
Epeak (keV)
GRB051008 GRB051111GRB051221GRB060105GRB060111GRB060117GRB060306GRB060501GRB060502
WAM+BAT joint fitis very powerful tool for Ep !
5000
120
296
86
110
70
34
27
290
242
71
30
938
244
263
131
779
329
170
220
112
68
462
450
461
174
822
+
!
+
!
+
!
+
!
+
!
+
!
+
!
+
!
+
!
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IV. WAM+BAT joint analysis~ Epeak distribution ~
Epeak distribution from all position determined GRBs (WAM-BAT joint fit + IPN localized GRBs)
Similar to BATSE results
Broader in high energy band thanBATSE ??
but
more samples are required !
-WAM results-normalized BATSE results
Number of events
Ep (log)
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IV. WAM+BAT joint analysis~ Ep-Eiso correlation ~
Ep-Eiso correlation from WAM+BAT
GRB05111 long GRB(z=1.55)WAM only detectedhard prompt emission
GRB051221 short GRB (z=0.54)Short GRB does notmeet Amati relation(Amati et al. 2006)
GRB050904Highest redshift(z=6.29)high-z GRB also satisfiesAmati-relation
Eiso(1052erg)
Ep,src(keV)
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II. GRB sciences with the WAM
Obtain the unbiased Epeak distribution.
There are few sample of high energy Epeak.High sensitive observation up to MeV region is needed.
Does MeV-GeV excess emissionreally exists? What’s origin?
Delayed excess emission against main synchrotron emission.Time variability around MeV region is important.
Preece et al.2000
Gonzalez et al. 2003
100 1000
WAM
102 103 104 (keV)
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Kolgomorov-Smilnov probability: ~15%
Selection effect ?
Epeak は明るさに比例するという報告(Shaefer 2003)。同じような明るさのGRBを捉えていたとするならば、分布は似てくるかも 0.1 1 10 100 1000
50-300 keV 256ms pkflux
BATSEWAM
10 100 1000 10000
Comparison of Epeak dist.
It seems allmost similar ?
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IV. Spectral Evolution of GRBs~ variability upto MeV enegy band ~Time variability upto MeV band from some GRBs
- Search for spectral evolution in MeV region- Detail analysis is in progress
50-100 keV
100-300keV
300-500keV
500-1000keV
1000-2000keV
GRB051008 GRB060213
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IV. WAM+BAT joint analysis~ joint fitting with Swift/BAT ~
Some GRBs are detected by WAM and Swift/BAT simultaneously
WAM+BAT joint fitting
More wide coverage for Epeak
Cross calibration for each other
Now, WAM responseuncertainty was fixed within 10-20% inmore than 100 keV band
10 - 20 %
Swift/BAT
WAM