Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Sun Jan 19 22:31:21 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger324907
======================================================================
Trigger: 00324907 Segment: 000
BAT Trigger Time: 243269090.432 [s; MET]
Trigger Stop: 243269094.528 [s; MET]
UTC: 2008-09-16T14:44:47.329660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 163.624433225854 Dec: 69.0443697041981 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.33
Image Trigger?: NO
Rate S/N Ratio: 8.48528137423857 [ if not an image trigger ]
Image S/N Ratio: 7.33
Analysis Position: [ source = BAT ]
RA: 163.624433225854 Dec: 69.0443697041981 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 163.626367345842 Dec: 69.0638946295065 [deg; J2000]
{ 10h 54m 30.3s , +69d 03' 50.0" }
+/- 2.00134034112659 [arcmin] (estimated 90% radius based on SNR)
+/- 0.773725823375993 [arcmin] (formal 1-sigma fit error)
SNR: 11.2891145706606
Angular difference between the analysis and refined position is 1.172230 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 33.5439999997616 +/- 6.96964046465048
Measured from: -0.948000013828278
to: 32.5959999859333 [s; relative to TRIGTIME]
T50: 15.444000005722 +/- 6.16649331210442
Measured from: 2.783999979496
to: 18.227999985218 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.391999989748
to: 2.391999989748 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.59200000762939
to: 35.7360000014305 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.252556 0.345226 0.293743 0.062999
0.040326 0.042572 0.039188 0.039069 [error]
Peak 0.009389 0.027509 0.021936 0.009449
0.006630 0.007023 0.006471 0.006376 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 38.328 -2.592 35.736
T90 33.544 -0.948 32.596
T50 15.444 2.784 18.228
Peak 1.000 1.392 2.392
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_index}
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.428 -0.226 0.225 - - - 1.73e-03 -2.29e-04 2.27e-04 47.130 57
CPL -0.860 -0.813 1.295 96.136 -38.681 -96.136 3.43e-03 -1.88e-03 1.25e-02 46.210 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -0.960 -0.605 0.718 - - - 4.72e-03 -1.55e-03 1.42e-03 61.670 57
CPL -0.985 -0.580 0.848 9999.360 -9999.360 -9999.360 4.77e-03 -1.57e-03 9.46e-03 61.690 56
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence PL 7.92e-08 1.52e-07 2.26e-07 7.24e-07 6.38e-07 1.18e-06 erg/cm2
90%_error_low -1.67e-08 -2.04e-08 -3.90e-08 -2.34e-07 -9.40e-08 -2.70e-07 erg/cm2
90%_error_hi 1.76e-08 2.02e-08 3.88e-08 3.03e-07 9.56e-08 3.28e-07 erg/cm2
Peak flux PL 1.16e-01 1.61e-01 1.66e-01 3.12e-01 5.42e-01 7.55e-01 ph/cm2/s
90%_error_low -7.36e-02 -7.23e-02 -5.39e-02 -1.84e-01 -1.69e-01 -2.34e-01 ph/cm2/s
90%_error_hi 9.51e-02 6.52e-02 5.11e-02 3.44e-01 1.70e-01 2.79e-01 ph/cm2/s
Fluence CPL 7.29e-08 1.62e-07 2.31e-07 3.04e-07 6.03e-07 7.69e-07 erg/cm2
90%_error_low -2.05e-08 -2.62e-08 -4.24e-08 -2.27e-07 -1.13e-07 -2.55e-07 erg/cm2
90%_error_hi 2.06e-08 2.81e-08 4.26e-08 2.59e-07 1.13e-07 6.93e-07 erg/cm2
Peak flux CPL 6.30e-02 4.95e-02 2.38e-02 2.13e-02 1.42e-01 1.72e-01 ph/cm2/s
90%_error_low -6.30e-02 -4.95e-02 -2.38e-02 -2.13e-02 -1.42e-01 -1.72e-01 ph/cm2/s
90%_error_hi 1.10e-01 8.71e-02 4.35e-02 3.12e-02 1.88e-01 1.64e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 163.6264 69.0639 0.0171 30.0425 -58.9416 0.9975319 11.289 TRIG_00324907 Foreground time interval of the image: -2.592 35.736 (delta_t = 38.328 [sec]) Background time interval of the image: -214.731 -2.592 (delta_t = 212.139 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -2.592 sec. to 35.736 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.42791 ( -0.226132 0.224672 ) Norm@50keV : 1.73155E-03 ( -0.000229229 0.000227493 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.13 using 59 PHA bins. # Reduced chi-squared = 0.8269 for 57 degrees of freedom # Null hypothesis probability = 8.212868e-01 Photon flux (15-150 keV) in 38.33 sec: 0.212249 ( -0.027371 0.0274 ) ph/cm2/s Energy fluence (15-150 keV) : 6.3785e-07 ( -9.39622e-08 9.5564e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.592 sec. to 35.736 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.86044 ( -0.81259 1.29467 ) Epeak [keV] : 96.1359 ( -38.6992 -96.1537 ) Norm@50keV : 3.42672E-03 ( -0.00187573 0.0125333 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.21 using 59 PHA bins. # Reduced chi-squared = 0.8252 for 56 degrees of freedom # Null hypothesis probability = 8.214278e-01 Photon flux (15-150 keV) in 38.33 sec: 0.206710 ( -0.029544 0.029134 ) ph/cm2/s Energy fluence (15-150 keV) : 6.02739e-07 ( -1.12657e-07 1.13188e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.392 sec. to 2.392 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.960132 ( -0.605247 0.717244 ) Norm@50keV : 4.72059E-03 ( -0.00154517 0.00141923 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.67 using 59 PHA bins. # Reduced chi-squared = 1.082 for 57 degrees of freedom # Null hypothesis probability = 3.126218e-01 Photon flux (15-150 keV) in 1 sec: 0.542481 ( -0.168962 0.169968 ) ph/cm2/s Energy fluence (15-150 keV) : 5.17965e-08 ( -1.63625e-08 1.65097e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.392 sec. to 2.392 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.985039 ( -0.581535 0.846318 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 4.76906E-03 ( -0.00156332 0.00946723 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.69 using 59 PHA bins. # Reduced chi-squared = 1.102 for 56 degrees of freedom # Null hypothesis probability = 2.798408e-01 Photon flux (15-150 keV) in 1 sec: 0.141675 ( -0.141675 0.18843 ) ph/cm2/s Energy fluence (15-150 keV) : 5.15929e-08 ( -1.65016e-08 1.69938e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 33.544 sec. Hardness ratio (energy fluence ratio) = 1.48672275492
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.3133083e-07 S(50-150 keV) = 4.0652e-07
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = 2.983725448065760E-01, IMY = 4.954300609552840E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -214.731400 -2.592000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4152 35.3414 1.5 40.5 -171.1 2.0124 7.5 2.1 Her X-1 299.5773 35.2094 0.6 41.1 131.6 8.9936 17.8 0.8 Cyg X-1 308.1010 41.0058 3.4 36.8 119.2 1.5672 3.4 3.2 Cyg X-3 258.9515 30.0997 2.5 45.2 -177.6 1.4651 4.6 ------ UNKNOWN 239.1568 19.9465 3.4 57.9 -156.8 3.9803 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.592000 35.736000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5796 35.2397 7.3 40.5 -171.3 0.1534 1.6 8.6 Her X-1 299.5985 35.2347 8.3 41.1 131.5 -0.2758 -1.4 2.0 Cyg X-1 307.9541 40.8857 7.9 36.9 119.5 0.2465 1.5 8.1 Cyg X-3 59.2889 47.6390 2.3 55.5 11.2 1.7835 5.1 ------ UNKNOWN 163.6264 69.0639 1.0 30.0 -58.9 0.9975 11.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 400.068590 962.683300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4658 35.2974 4.0 41.1 -66.2 3.6517 2.9 2.7 Her X-1 268.2938 -1.4055 3.4 37.1 -129.7 2.1955 3.4 5.3 SW J1753.5-0127 270.3058 -25.0771 6.4 53.6 -154.2 2.2728 1.8 1.2 GX 5-1 270.3258 -25.7510 4.9 54.1 -154.7 3.0896 2.3 1.3 GRS 1758-258 274.0279 -14.0040 2.8 42.4 -149.7 2.8745 4.1 2.3 GX 17+2 275.9279 -30.5190 5.8 55.8 -162.8 -3.0133 -2.0 9.1 H1820-303 284.9241 -24.9281 15.0 47.7 -169.6 0.6052 0.8 6.1 HT1900.1-2455 288.7881 10.9661 0.6 13.7 -141.5 6.9501 19.9 1.4 GRS 1915+105 299.5976 35.2084 0.1 14.3 -3.0 27.8432 80.7 0.5 Cyg X-1 308.1252 40.9539 1.0 21.6 13.5 4.0170 11.1 0.7 Cyg X-3 326.2381 38.2099 4.0 29.5 41.5 1.4187 2.9 7.4 Cyg X-2 317.9565 18.9386 3.2 18.3 86.3 1.3889 3.6 ------ UNKNOWN 298.7561 43.8189 2.9 22.9 -6.1 1.4534 4.0 ------ UNKNOWN 300.9529 57.2693 3.3 36.4 -4.2 1.8556 3.5 ------ UNKNOWN 253.6559 27.6558 2.6 41.3 -77.9 7.1444 4.4 ------ UNKNOWN 257.7452 2.9571 2.5 43.6 -115.1 8.0535 4.6 ------ UNKNOWN