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 04:24:10 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger522578
======================================================================
Trigger: 00522578 Segment: 000
BAT Trigger Time: 359272791.168 [s; MET]
Trigger Stop: 359272791.68 [s; MET]
UTC: 2012-05-21T05:59:42.937680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 148.69332117108 Dec: -49.4193802244313 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.48
Image Trigger?: NO
Rate S/N Ratio: 24.6981780704569 [ if not an image trigger ]
Image S/N Ratio: 11.48
Analysis Position: [ source = BAT ]
RA: 148.69332117108 Dec: -49.4193802244313 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 148.686940886453 Dec: -49.4244012807195 [deg; J2000]
{ 09h 54m 44.9s , -49d 25' 27.8" }
+/- 1.75349438379915 [arcmin] (estimated 90% radius based on SNR)
+/- 0.740366609476014 [arcmin] (formal 1-sigma fit error)
SNR: 13.6358919896314
Angular difference between the analysis and refined position is 0.390856 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 0.51199996471405 +/- 0.143108374017273
Measured from: -0.0079999566078186
to: 0.504000008106232 [s; relative to TRIGTIME]
T50: 0.25600004196167 +/- 0.0640000104904175
Measured from: 0.0559999942779541
to: 0.312000036239624 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.187999963760376
to: 0.812000036239624 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0079999566078186
to: 0.568000018596649 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.018330 0.042938 0.041515 0.015896
0.004411 0.004847 0.004633 0.004105 [error]
Peak 0.012586 0.046076 0.046788 0.018408
0.005605 0.005971 0.005565 0.004875 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.576 -0.008 0.568
T90 0.512 -0.008 0.504
T50 0.256 0.056 0.312
Peak 1.000 -0.188 0.812
====== 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 -1.009 -0.219 0.225 - - - 1.27e-02 -1.59e-03 1.59e-03 47.100 57
CPL -0.391 -0.714 1.014 142.866 N/A N/A 2.44e-02 N/A N/A 45.470 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 -0.864 -0.244 0.256 - - - 7.75e-03 -1.14e-03 1.13e-03 42.380 57
CPL 0.098 -0.973 1.283 127.855 -43.080 5269.475 2.00e-02 -1.21e-02 4.45e-02 39.570 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 5.89e-09 1.46e-08 2.91e-08 1.44e-07 7.86e-08 1.94e-07 erg/cm2
90%_error_low -1.40e-09 -2.17e-09 -4.28e-09 -4.26e-08 -1.11e-08 -4.57e-08 erg/cm2
90%_error_hi 1.51e-09 2.13e-09 4.24e-09 5.44e-08 1.13e-08 5.62e-08 erg/cm2
Peak flux PL 1.74e-01 2.56e-01 2.82e-01 5.82e-01 8.89e-01 1.29e+00 ph/cm2/s
90%_error_low -5.01e-02 -4.82e-02 -4.25e-02 -1.70e-01 -1.30e-01 -2.05e-01 ph/cm2/s
90%_error_hi 5.62e-02 4.76e-02 4.22e-02 2.14e-01 1.30e-01 2.21e-01 ph/cm2/s
Fluence CPL 5.12e-09 1.53e-08 3.07e-08 6.40e-08 7.52e-08 1.15e-07 erg/cm2
90%_error_low -1.70e-09 -2.43e-09 -4.84e-09 -3.98e-08 -1.23e-08 -4.14e-08 erg/cm2
90%_error_hi 1.80e-09 2.51e-09 5.00e-09 9.68e-08 1.22e-08 9.82e-08 erg/cm2
Peak flux CPL 1.32e-01 2.64e-01 3.11e-01 2.59e-01 8.52e-01 9.66e-01 ph/cm2/s
90%_error_low -5.95e-02 -5.50e-02 -5.23e-02 -1.39e-01 -1.35e-01 -2.00e-01 ph/cm2/s
90%_error_hi 6.86e-02 5.46e-02 5.42e-02 3.45e-01 1.36e-01 3.57e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 148.6869 -49.4244 0.0140 13.1385 -32.7837 0.1131131 13.636 TRIG_00522578 Foreground time interval of the image: -0.008 0.568 (delta_t = 0.576 [sec]) Background time interval of the image: -597.067 -578.595 (delta_t = 18.472 [sec]) -239.168 -0.008 (delta_t = 239.160 [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 -0.008 sec. to 0.568 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.00943 ( -0.218693 0.224853 ) Norm@50keV : 1.26532E-02 ( -0.0015916 0.00158927 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.10 using 59 PHA bins. # Reduced chi-squared = 0.8264 for 57 degrees of freedom # Null hypothesis probability = 8.220801e-01 Photon flux (15-150 keV) in 0.576 sec: 1.45750 ( -0.18518 0.18546 ) ph/cm2/s Energy fluence (15-150 keV) : 7.85583e-08 ( -1.11238e-08 1.12719e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.568 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.391057 ( -0.713982 1.01425 ) Epeak [keV] : 142.866 ( ) Norm@50keV : 2.44151E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.47 using 59 PHA bins. # Reduced chi-squared = 0.8120 for 56 degrees of freedom # Null hypothesis probability = 8.415114e-01 Photon flux (15-150 keV) in 0.576 sec: 1.41602 ( -0.19392 0.19355 ) ph/cm2/s Energy fluence (15-150 keV) : 7.51836e-08 ( -1.22949e-08 1.22348e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.188 sec. to 0.812 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.863632 ( -0.244189 0.256454 ) Norm@50keV : 7.74876E-03 ( -0.0011408 0.00113154 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 42.38 using 59 PHA bins. # Reduced chi-squared = 0.7435 for 57 degrees of freedom # Null hypothesis probability = 9.255783e-01 Photon flux (15-150 keV) in 1 sec: 0.889364 ( -0.129577 0.130106 ) ph/cm2/s Energy fluence (15-150 keV) : 8.82247e-08 ( -1.35678e-08 1.37025e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.188 sec. to 0.812 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.0977731 ( -0.972499 1.28316 ) Epeak [keV] : 127.855 ( -43.0823 5269.48 ) Norm@50keV : 2.00404E-02 ( -0.0121298 0.0445452 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.57 using 59 PHA bins. # Reduced chi-squared = 0.7065 for 56 degrees of freedom # Null hypothesis probability = 9.528179e-01 Photon flux (15-150 keV) in 1 sec: 0.851633 ( -0.134807 0.1355 ) ph/cm2/s Energy fluence (15-150 keV) : 8.38012e-08 ( -1.47438e-08 1.46906e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.512 sec. Hardness ratio (energy fluence ratio) = 1.98701015688
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.0528323e-08 S(50-150 keV) = 5.80295e-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 = 1.962374582997249E-01, IMY = 1.263874497532329E-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: -597.067410 -578.595400 -239.168000 -0.008000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5277 -40.5514 1.0 25.6 -42.5 2.5028 11.3 0.2 Vela X-1 170.4156 -60.6790 1.4 4.0 115.7 1.4754 8.3 4.5 Cen X-3 186.7592 -62.6451 6.8 11.9 124.5 0.3270 1.7 8.0 GX 301-2 167.4864 -34.4646 2.5 25.6 20.0 0.9599 4.6 ------ UNKNOWN 147.5821 -5.8994 2.3 55.2 -7.6 3.2874 5.0 ------ UNKNOWN 140.2208 -4.7615 3.0 57.7 -16.0 3.5497 3.9 ------ UNKNOWN 4.9577 -61.0240 3.7 57.9 -156.7 4.4599 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.008000 0.568000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5011 -40.5285 1689.7 25.6 -42.5 -0.0001 -0.0 2.0 Vela X-1 170.1877 -60.5702 6.3 3.8 114.4 0.0174 1.8 4.9 Cen X-3 186.6296 -62.9368 189.5 11.8 126.0 0.0006 0.1 10.0 GX 301-2 148.6869 -49.4244 0.8 13.1 -32.8 0.1131 13.6 ------ UNKNOWN 134.4507 -5.0158 2.4 58.9 -22.6 0.2787 4.8 ------ UNKNOWN 82.0477 -61.8363 2.2 36.7 -118.2 0.0897 5.2 ------ UNKNOWN 124.1715 -15.2011 2.2 52.7 -38.3 0.2162 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 56.732610 594.832600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5129 -40.5572 0.5 12.8 -64.5 8.1953 23.6 0.7 Vela X-1 170.2281 -60.6152 1.8 16.5 127.7 2.2579 6.3 2.6 Cen X-3 186.5374 -62.6991 4.6 24.4 124.0 1.0219 2.5 5.4 GX 301-2 39.2723 -61.6824 2.7 55.5 -160.3 5.7018 4.3 ------ UNKNOWN 132.4172 3.0568 4.1 54.3 -33.3 6.0986 2.8 ------ UNKNOWN 86.2622 -40.5752 3.6 43.7 -116.2 5.5674 3.2 ------ UNKNOWN