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 14:23:21 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger361489
======================================================================
Trigger: 00361489 Segment: 000
BAT Trigger Time: 273447030.976 [s; MET]
Trigger Stop: 273447036.48 [s; MET]
UTC: 2009-08-31T21:30:25.929900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 108.278334509616 Dec: -25.1000128821772 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.36
Image Trigger?: NO
Rate S/N Ratio: 10 [ if not an image trigger ]
Image S/N Ratio: 8.36
Analysis Position: [ source = BAT ]
RA: 108.278334509616 Dec: -25.1000128821772 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 108.278 Dec: -25.1 [deg; J2000]
{ 07h 13m 06.7s , -25d -6' -0.0" }
+/- 2.4320250741 [arcmin] (estimated 90% radius based on SNR)
SNR: 8.54657821917
Angular difference between the analysis and refined position is 0.018192 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 77.9520000219345 +/- 14.7999221917989
Measured from: 1.11199998855591
to: 79.0640000104904 [s; relative to TRIGTIME]
T50: 53.3120000362396 +/- 27.6332553388862
Measured from: 3.28799998760223
to: 56.6000000238419 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.92399996519089
to: 2.92399996519089 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.407999992370605
to: 81.1759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.178726 0.187652 0.151548 0.083633
0.050343 0.051848 0.045372 0.039819 [error]
Peak 0.013926 0.026721 0.019108 0.009898
0.005856 0.005873 0.005415 0.004544 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 80.768 0.408 81.176
T90 77.952 1.112 79.064
T50 53.312 3.288 56.600
Peak 1.000 1.924 2.924
====== 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 -1.311 -0.495 0.519 - - - 4.78e-04 -1.24e-04 1.23e-04 59.360 57
CPL -1.325 -0.481 0.539 9999.340 -9999.340 -9999.340 4.79e-04 -1.23e-04 1.17e-03 59.370 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 -1.180 -0.459 0.496 - - - 4.66e-03 -1.16e-03 1.16e-03 39.530 57
CPL -1.191 1.191 1.086 9999.350 N/A N/A 4.68e-03 N/A N/A 39.540 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 4.13e-08 8.52e-08 1.37e-07 4.96e-07 3.80e-07 7.59e-07 erg/cm2
90%_error_low -1.90e-08 -2.51e-08 -4.66e-08 -2.88e-07 -1.11e-07 -3.32e-07 erg/cm2
90%_error_hi 2.12e-08 2.38e-08 4.52e-08 5.13e-07 1.14e-07 5.23e-07 erg/cm2
Peak flux PL 1.41e-01 1.72e-01 1.52e-01 2.30e-01 5.45e-01 6.95e-01 ph/cm2/s
90%_error_low -6.65e-02 -5.39e-02 -4.46e-02 -1.18e-01 -1.40e-01 -1.80e-01 ph/cm2/s
90%_error_hi 7.65e-02 5.08e-02 4.31e-02 1.86e-01 1.41e-01 1.90e-01 ph/cm2/s
Fluence CPL 4.13e-08 8.52e-08 1.37e-07 5.72e-07 3.83e-07 7.86e-07 erg/cm2
90%_error_low N/A N/A N/A -4.62e-07 N/A -4.78e-07 erg/cm2
90%_error_hi N/A N/A N/A 1.23e-07 N/A 3.57e-07 erg/cm2
Peak flux CPL 1.41e-01 1.72e-01 1.51e-01 2.29e-01 5.50e-01 7.00e-01 ph/cm2/s
90%_error_low N/A N/A N/A N/A -1.62e-01 -2.10e-01 ph/cm2/s
90%_error_hi N/A N/A N/A N/A 1.65e-01 1.64e-01 ph/cm2/s
======================================================================
Image
Pre-slew 25.0-100.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 108.278 -25.100 0.000 23.376 -39.373 0.160 8.547 TRIG_00361489 Image time interval: 0.000 to 5.504 [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 0.408 sec. to 81.176 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.3113 ( -0.495123 0.518873 ) Norm@50keV : 4.77831E-04 ( -0.00012434 0.00012331 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.36 using 59 PHA bins. # Reduced chi-squared = 1.041 for 57 degrees of freedom # Null hypothesis probability = 3.895380e-01 Photon flux (15-150 keV) in 80.77 sec: 5.71272E-02 ( -0.0150076 0.0150378 ) ph/cm2/s Energy fluence (15-150 keV) : 3.80391e-07 ( -1.11269e-07 1.14147e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.408 sec. to 81.176 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.3251 ( -0.482484 0.538277 ) Epeak [keV] : 9999.34 ( -9999.36 -9999.36 ) Norm@50keV : 4.78959E-04 ( -0.000123613 0.00116785 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.37 using 59 PHA bins. # Reduced chi-squared = 1.060 for 56 degrees of freedom # Null hypothesis probability = 3.537623e-01 Photon flux (15-150 keV) in 80.77 sec: 5.73345E-02 ( -0.0153883 0.014981 ) ph/cm2/s Energy fluence (15-150 keV) : 3.83054e-07 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.924 sec. to 2.924 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.18024 ( -0.459058 0.496432 ) Norm@50keV : 4.65709E-03 ( -0.00115817 0.00115718 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.53 using 59 PHA bins. # Reduced chi-squared = 0.6935 for 57 degrees of freedom # Null hypothesis probability = 9.622621e-01 Photon flux (15-150 keV) in 1 sec: 0.545177 ( -0.140497 0.140973 ) ph/cm2/s Energy fluence (15-150 keV) : 4.75215e-08 ( -1.30532e-08 1.32668e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.924 sec. to 2.924 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.77795 ( 2.77713 2.67262 ) Epeak [keV] : 230.076 ( ) Norm@50keV : 5.46021E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.36 using 59 PHA bins. # Reduced chi-squared = 0.7029 for 56 degrees of freedom # Null hypothesis probability = 9.551530e-01 Photon flux (15-150 keV) in 1 sec: 0.549999 ( -0.162176 0.164871 ) ph/cm2/s Energy fluence (15-150 keV) : 4.81837e-08 ( -1.38572e-08 1.23964e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 77.952 sec. Hardness ratio (energy fluence ratio) = 1.61190646849
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.2650494e-07 S(50-150 keV) = 2.538845e-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 = 0.334132621021, IMY = 0.274198475222
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: -239.976000 0.408000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6448 22.0147 0.3 32.8 179.4 9.7479 39.6 0.6 Crab 135.5127 -40.5983 2.2 50.8 -36.2 4.1535 5.3 2.7 Vela X-1 96.2037 1.5188 3.1 13.8 -140.2 0.6907 3.8 ------ UNKNOWN 135.9203 -27.3662 3.2 47.1 -53.1 3.4014 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.408000 54.524600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.5060 21.9544 8.2 32.8 179.2 0.1361 1.4 7.9 Crab 135.6260 -40.3996 6.3 50.8 -36.5 0.5570 1.8 10.3 Vela X-1 50.7460 14.5348 2.6 45.5 131.4 1.5700 4.4 ------ UNKNOWN 52.0311 -47.2824 2.1 48.4 42.1 1.9772 5.5 ------ UNKNOWN 70.0226 31.2833 2.6 45.5 165.8 0.8001 4.5 ------ UNKNOWN 108.3298 -25.1560 1.9 23.4 -39.3 0.5489 6.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 101.524580 962.066100 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6390 22.0182 0.6 52.8 177.8 32.6171 19.0 0.4 Crab 135.5204 -40.5576 0.3 27.4 -22.2 16.6772 34.4 0.4 Vela X-1 170.3666 -60.6540 12.6 54.7 -5.2 -1.2820 -0.9 2.4 Cen X-3 62.8100 -28.1591 3.7 40.5 102.1 6.0871 3.2 ------ UNKNOWN 72.4185 -41.0040 2.5 33.7 79.7 4.3278 4.6 ------ UNKNOWN 78.7116 22.8248 2.8 55.9 173.5 11.4031 4.2 ------ UNKNOWN 173.6351 -63.7362 2.9 56.8 -1.9 9.9465 4.0 ------ UNKNOWN 139.0214 -53.2853 2.7 36.4 -4.2 3.2061 4.3 ------ UNKNOWN 176.6833 -57.4672 2.7 57.5 -9.5 9.2828 4.3 ------ UNKNOWN 100.8424 26.8958 3.6 52.5 -161.6 4.8308 3.2 ------ UNKNOWN 161.0139 -42.5269 3.5 46.3 -27.4 2.9311 3.3 ------ UNKNOWN 165.7237 -40.8739 2.2 49.7 -29.8 6.1525 5.2 ------ UNKNOWN 160.3025 -23.9089 3.2 47.0 -53.1 9.1808 3.7 ------ UNKNOWN