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: Mon Jan 13 03:59:03 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger525451
======================================================================
Trigger: 00525451 Segment: 000
BAT Trigger Time: 362791062.144 [s; MET]
Trigger Stop: 362791062.656 [s; MET]
UTC: 2012-06-30T23:17:33.768120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 352.284720356421 Dec: 42.509854645773 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.87
Image Trigger?: NO
Rate S/N Ratio: 13.856406460551 [ if not an image trigger ]
Image S/N Ratio: 6.87
Analysis Position: [ source = BAT ]
RA: 352.284720356421 Dec: 42.509854645773 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 352.30163391658 Dec: 42.4946321895834 [deg; J2000]
{ 23h 29m 12.4s , +42d 29' 40.7" }
+/- 2.72548590820523 [arcmin] (estimated 90% radius based on SNR)
+/- 1.62278977496944 [arcmin] (formal 1-sigma fit error)
SNR: 7.26198934334174
Angular difference between the analysis and refined position is 1.180663 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 0.595999896526337 +/- 0.209914213178579
Measured from: -0.0119999647140503
to: 0.583999931812286 [s; relative to TRIGTIME]
T50: 0.247999966144562 +/- 0.18822332093353
Measured from: 0.208000004291534
to: 0.455999970436096 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.212000012397766
to: 0.787999987602234 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0320000052452087
to: 0.607999980449677 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.020245 0.023955 0.028494 0.011595
0.005865 0.006160 0.005939 0.004586 [error]
Peak 0.012935 0.027562 0.028408 0.003198
0.007286 0.007427 0.006940 0.005520 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.640 -0.032 0.608
T90 0.596 -0.012 0.584
T50 0.248 0.208 0.456
Peak 1.000 -0.212 0.788
====== 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 -1.030 -0.395 0.421 - - - 8.79e-03 -2.03e-03 1.97e-03 45.560 57
CPL -1.023 -0.399 0.467 9999.310 -9999.310 -9999.310 8.83e-03 -1.99e-03 1.32e-02 45.560 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 -0.487 0.548 - - - 5.31e-03 -1.59e-03 1.53e-03 47.480 57
CPL -0.750 -3.347 1.824 370.750 N/A N/A 6.48e-03 N/A N/A 47.480 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 4.63e-09 1.14e-08 2.23e-08 1.08e-07 6.02e-08 1.46e-07 erg/cm2
90%_error_low -2.04e-09 -3.35e-09 -5.26e-09 -4.94e-08 -1.36e-08 -5.28e-08 erg/cm2
90%_error_hi 2.42e-09 3.19e-09 5.11e-09 7.22e-08 1.36e-08 7.20e-08 erg/cm2
Peak flux PL 1.31e-01 1.82e-01 1.87e-01 3.51e-01 6.11e-01 8.50e-01 ph/cm2/s
90%_error_low -7.17e-02 -7.08e-02 -5.34e-02 -1.78e-01 -1.80e-01 -2.41e-01 ph/cm2/s
90%_error_hi 9.14e-02 6.84e-02 5.26e-02 2.75e-01 1.82e-01 2.58e-01 ph/cm2/s
Fluence CPL 4.63e-09 1.14e-08 2.16e-08 1.09e-07 6.00e-08 1.37e-07 erg/cm2
90%_error_low N/A N/A -6.07e-09 -7.37e-08 -1.72e-08 -6.45e-08 erg/cm2
90%_error_hi N/A N/A 8.19e-09 2.99e-08 1.74e-08 7.74e-08 erg/cm2
Peak flux CPL 1.26e-01 1.82e-01 1.90e-01 3.16e-01 6.08e-01 8.13e-01 ph/cm2/s
90%_error_low -9.71e-02 -7.09e-02 -5.61e-02 -3.16e-01 -1.84e-01 -3.21e-01 ph/cm2/s
90%_error_hi 8.18e-02 7.15e-02 6.69e-02 2.96e-01 1.78e-01 2.85e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 352.3016 42.4946 0.0265 33.9638 -30.4332 0.0838499 7.262 TRIG_00525451 Foreground time interval of the image: -0.032 0.608 (delta_t = 0.640 [sec]) Background time interval of the image: -239.144 -0.032 (delta_t = 239.112 [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 -0.032 sec. to 0.608 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.03003 ( -0.394991 0.421338 ) Norm@50keV : 8.78548E-03 ( -0.00203013 0.0019696 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.56 using 59 PHA bins. # Reduced chi-squared = 0.7992 for 57 degrees of freedom # Null hypothesis probability = 8.620880e-01 Photon flux (15-150 keV) in 0.64 sec: 1.01326 ( -0.237527 0.23897 ) ph/cm2/s Energy fluence (15-150 keV) : 6.01727e-08 ( -1.36291e-08 1.36143e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.608 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.02316 ( -0.399346 0.467607 ) Epeak [keV] : 9999.31 ( -9999.36 -9999.36 ) Norm@50keV : 8.83465E-03 ( -0.00198791 0.0132005 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.56 using 59 PHA bins. # Reduced chi-squared = 0.8137 for 56 degrees of freedom # Null hypothesis probability = 8.391205e-01 Photon flux (15-150 keV) in 0.64 sec: 1.01307 ( -0.23761 0.2389 ) ph/cm2/s Energy fluence (15-150 keV) : 6.00454e-08 ( -1.72024e-08 1.74489e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.212 sec. to 0.788 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.960109 ( -0.487181 0.54844 ) Norm@50keV : 5.31465E-03 ( -0.0015915 0.00152664 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.48 using 59 PHA bins. # Reduced chi-squared = 0.8330 for 57 degrees of freedom # Null hypothesis probability = 8.114182e-01 Photon flux (15-150 keV) in 1 sec: 0.610796 ( -0.179685 0.182401 ) ph/cm2/s Energy fluence (15-150 keV) : 5.83109e-08 ( -1.65961e-08 1.66923e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.212 sec. to 0.788 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.12809 ( -1.96888 3.20137 ) Epeak [keV] : 42.8343 ( ) Norm@50keV : 3.67527E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.15 using 59 PHA bins. # Reduced chi-squared = 0.8420 for 56 degrees of freedom # Null hypothesis probability = 7.940734e-01 Photon flux (15-150 keV) in 1 sec: 0.607528 ( -0.184449 0.177595 ) ph/cm2/s Energy fluence (15-150 keV) : 5.81661e-08 ( -1.6828e-08 1.67508e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.5959999 sec. Hardness ratio (energy fluence ratio) = 1.95884561474
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.5996598e-08 S(50-150 keV) = 4.417672e-08
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 = 5.807817109795863E-01, IMY = 3.411954567137049E-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: -239.144000 -0.032000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4354 35.3268 6.4 39.4 169.5 0.5167 1.8 1.4 Her X-1 288.8342 10.9480 1.6 35.8 102.2 3.2226 7.1 2.1 GRS 1915+105 299.6738 35.2085 2.3 9.6 101.9 0.9232 5.0 4.1 Cyg X-1 308.1110 40.9859 2.0 3.6 35.3 1.0183 5.7 2.0 Cyg X-3 326.1696 38.3214 6.3 16.7 -3.9 0.3349 1.8 0.1 Cyg X-2 351.3533 24.0645 2.6 42.4 -3.6 1.3399 4.4 ------ UNKNOWN 236.0637 72.1149 2.9 42.4 -131.0 1.7112 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.032000 0.608000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6365 35.3774 4.0 39.2 169.4 0.0375 2.9 9.0 Her X-1 288.6826 11.0559 12.5 35.7 102.5 0.0193 0.9 9.5 GRS 1915+105 299.7789 35.2139 4.9 9.5 101.5 -0.0198 -2.3 9.3 Cyg X-1 308.2214 40.7681 5.5 3.8 36.2 0.0170 2.1 12.2 Cyg X-3 326.2918 38.4331 8.5 16.8 -4.4 0.0114 1.4 8.8 Cyg X-2 6.8137 18.3063 2.1 57.2 -10.1 0.2241 5.7 ------ UNKNOWN 352.3048 42.4939 1.6 34.0 -30.4 0.0857 7.4 ------ UNKNOWN 2.1781 53.9664 2.3 37.7 -52.1 0.0784 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 72.556610 962.906500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5903 35.2016 25.1 41.0 127.0 0.7656 0.5 0.0 Cyg X-1 308.0663 40.9291 2.4 32.7 131.6 4.3147 4.9 2.4 Cyg X-3 325.9772 38.3657 4.7 20.4 116.2 1.3435 2.5 9.5 Cyg X-2 314.0453 26.6441 3.4 34.9 104.5 3.9118 3.4 ------ UNKNOWN 217.8670 79.0579 2.9 55.6 -160.4 7.2019 4.0 ------ UNKNOWN 205.5908 76.9222 4.9 58.8 -159.3 11.2292 2.4 ------ UNKNOWN 198.2196 78.6186 4.9 57.9 -156.8 8.8406 2.4 ------ UNKNOWN 119.7717 81.1718 3.2 53.2 -142.2 11.0816 3.6 ------ UNKNOWN 43.9474 22.7757 2.9 46.9 -53.0 11.4080 3.9 ------ UNKNOWN 54.3878 55.0924 3.1 41.3 -100.9 11.9363 3.8 ------ UNKNOWN