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 20 08:51:45 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger282808
======================================================================
Trigger: 00282808 Segment: 000
BAT Trigger Time: 204160661.888 [s; MET]
Trigger Stop: 204160662.912 [s; MET]
UTC: 2007-06-21T23:17:39.850480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 323.80441851629 Dec: -24.80574107457 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.01
Image Trigger?: NO
Rate S/N Ratio: 17.2916164657906 [ if not an image trigger ]
Image S/N Ratio: 9.01
Analysis Position: [ source = BAT ]
RA: 323.80441851629 Dec: -24.80574107457 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 323.806433141097 Dec: -24.8101230300264 [deg; J2000]
{ 21h 35m 13.5s , -24d 48' 36.4" }
+/- 0.894165670619298 [arcmin] (estimated 90% radius based on SNR)
+/- 0.248461303940003 [arcmin] (formal 1-sigma fit error)
SNR: 35.6879209582564
Angular difference between the analysis and refined position is 0.284894 arcmin
Partial Coding Fraction: 0.3164062 [ including projection effects ]
Duration
T90: 33.2639999985695 +/- 2.50705882258121
Measured from: -2.13199999928474
to: 31.1319999992847 [s; relative to TRIGTIME]
T50: 17.5839999914169 +/- 0.756042309071645
Measured from: 4.45199999213219
to: 22.0359999835491 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 21.5759999752045
to: 22.5759999752045 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.19200000166893
to: 36.4639999866486 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.700355 2.390057 1.952503 0.562269
0.067000 0.068263 0.059753 0.046388 [error]
Peak 0.071206 0.110255 0.090672 0.040049
0.010781 0.011552 0.010275 0.007882 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 41.656 -5.192 36.464
T90 33.264 -2.132 31.132
T50 17.584 4.452 22.036
Peak 1.000 21.576 22.576
====== 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 -1.527 -0.061 0.061 - - - 1.12e-02 -3.63e-04 3.63e-04 41.100 57
CPL -1.484 -0.152 0.203 666.596 -666.596 -666.596 1.17e-02 -8.53e-04 2.63e-03 41.140 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 -1.376 -0.198 0.201 - - - 2.05e-02 -2.29e-03 2.29e-03 61.170 57
CPL -1.378 -0.195 0.292 9999.360 -9999.360 -9999.360 2.06e-02 -1.81e-02 -1.08e-02 61.180 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 6.11e-07 1.10e-06 1.53e-06 4.43e-06 4.40e-06 7.67e-06 erg/cm2
90%_error_low -3.95e-08 -4.21e-08 -6.01e-08 -3.85e-07 -1.48e-07 -4.18e-07 erg/cm2
90%_error_hi 4.05e-08 4.19e-08 6.00e-08 4.09e-07 1.48e-07 4.36e-07 erg/cm2
Peak flux PL 7.51e-01 8.13e-01 6.27e-01 7.91e-01 2.49e+00 2.98e+00 ph/cm2/s
90%_error_low -1.58e-01 -1.08e-01 -8.23e-02 -2.00e-01 -2.95e-01 -3.35e-01 ph/cm2/s
90%_error_hi 1.69e-01 1.06e-01 8.10e-02 2.39e-01 2.97e-01 3.36e-01 ph/cm2/s
Fluence CPL 6.09e-07 1.10e-06 1.53e-06 4.41e-06 4.40e-06 7.58e-06 erg/cm2
90%_error_low -5.13e-08 -4.04e-08 -6.27e-08 -1.23e-06 -1.60e-07 -1.11e-06 erg/cm2
90%_error_hi 3.19e-08 4.57e-08 7.01e-08 2.64e-07 1.52e-07 4.93e-07 erg/cm2
Peak flux CPL 5.08e-01 2.79e-01 1.70e-01 1.33e-01 9.14e-01 9.36e-01 ph/cm2/s
90%_error_low -2.25e-01 -1.34e-01 -8.75e-02 -1.33e-01 -4.12e-01 -4.24e-01 ph/cm2/s
90%_error_hi 2.60e-01 2.63e-01 6.58e-02 5.78e-02 7.27e-01 7.47e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 323.8064 -24.8101 0.0054 43.0950 15.5766 3.6867392 35.688 TRIG_00282808 Foreground time interval of the image: -5.192 14.213 (delta_t = 19.405 [sec]) Background time interval of the image: -239.888 -5.192 (delta_t = 234.696 [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 -5.192 sec. to 36.464 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52721 ( -0.0605777 0.0605786 ) Norm@50keV : 1.11885E-02 ( -0.000362769 0.000362769 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 41.10 using 59 PHA bins. # Reduced chi-squared = 0.7210 for 57 degrees of freedom # Null hypothesis probability = 9.443102e-01 Photon flux (15-150 keV) in 41.66 sec: 1.40727 ( -0.05143 0.05172 ) ph/cm2/s Energy fluence (15-150 keV) : 4.40342e-06 ( -1.48325e-07 1.48339e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.192 sec. to 36.464 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52454 ( -0.149759 0.205009 ) Epeak [keV] : 9997.61 ( -9997.48 -9997.48 ) Norm@50keV : 1.12204E-02 ( -0.000363819 0.00311636 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 41.09 using 59 PHA bins. # Reduced chi-squared = 0.7338 for 56 degrees of freedom # Null hypothesis probability = 9.322691e-01 Photon flux (15-150 keV) in 41.66 sec: 1.40593 ( -0.05671 0.05352 ) ph/cm2/s Energy fluence (15-150 keV) : 4.40025e-06 ( -1.5983e-07 1.52448e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 21.576 sec. to 22.576 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.37605 ( -0.198219 0.200676 ) Norm@50keV : 2.05433E-02 ( -0.00229029 0.00229018 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.17 using 59 PHA bins. # Reduced chi-squared = 1.073 for 57 degrees of freedom # Null hypothesis probability = 3.287866e-01 Photon flux (15-150 keV) in 1 sec: 2.48857 ( -0.29527 0.29665 ) ph/cm2/s Energy fluence (15-150 keV) : 1.99522e-07 ( -2.38591e-08 2.39587e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.576 sec. to 22.576 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.47018 ( -0.195518 0.29097 ) Epeak [keV] : 157.646 ( -9999.36 -9999.36 ) Norm@50keV : 4.63597E-03 ( -0.00213693 0.00510721 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.19 using 59 PHA bins. # Reduced chi-squared = 1.075 for 56 degrees of freedom # Null hypothesis probability = 3.266914e-01 Photon flux (15-150 keV) in 1 sec: 0.914288 ( -0.411705 0.726792 ) ph/cm2/s Energy fluence (15-150 keV) : 2.00928e-07 ( -2.54228e-08 2.26299e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 33.264 sec. Hardness ratio (energy fluence ratio) = 1.38781049463
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.7140025e-06 S(50-150 keV) = 2.689369e-06
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 = 9.012552681999916E-01, IMY = -2.512377228390137E-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: -239.888000 -5.192000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9851 -15.6459 0.6 45.3 134.0 14.4210 17.8 0.5 Sco X-1 254.4921 35.3338 1.9 46.6 -151.2 2.2869 6.3 1.8 Her X-1 263.0979 -24.7261 23.1 34.8 108.6 0.2066 0.5 5.0 GX 1+4 268.3133 -1.4640 3.3 19.6 150.9 0.5966 3.5 3.4 SW J1753.5-0127 270.2895 -25.0606 3.1 30.8 99.1 1.2255 3.7 1.2 GX 5-1 270.4501 -25.7635 6.5 31.2 98.1 0.5956 1.8 8.1 GRS 1758-258 273.9867 -14.0392 3.0 20.0 109.5 0.7685 3.8 1.1 GX 17+2 275.7676 -30.3660 5.7 33.0 86.2 0.8117 2.0 8.1 H1820-303 284.9669 -24.7344 0.0 25.5 72.9 0.2556 1.1 11.8 HT1900.1-2455 288.8105 10.9379 1.2 10.4 -107.8 1.6579 9.4 0.8 GRS 1915+105 299.5962 35.1874 0.8 36.3 -96.8 7.0646 15.3 0.9 Cyg X-1 308.7556 -4.8922 2.5 21.6 -8.2 0.7505 4.6 ------ UNKNOWN 300.5345 40.0729 4.2 41.1 -98.3 2.6104 2.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -5.192000 14.212600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9879 -15.7162 6.5 45.3 133.9 0.3837 1.8 4.6 Sco X-1 254.4144 35.4595 4.0 46.7 -151.2 0.2731 2.9 7.3 Her X-1 262.9299 -24.6832 4.7 34.9 108.8 0.2705 2.4 5.7 GX 1+4 268.4859 -1.5564 5.8 19.5 150.5 0.1037 2.0 9.4 SW J1753.5-0127 270.2291 -24.8827 0.0 30.6 99.4 0.1354 1.5 12.2 GX 5-1 270.4251 -25.8102 3.8 31.3 98.1 -0.2799 -3.0 7.8 GRS 1758-258 273.8157 -14.1125 24.3 20.2 109.7 -0.0287 -0.5 12.0 GX 17+2 275.9272 -30.3697 41.2 33.0 86.0 0.0310 0.3 0.2 H1820-303 285.0280 -24.9086 51.1 25.6 72.8 0.0159 0.2 0.8 HT1900.1-2455 288.7271 10.8722 6.0 10.3 -108.2 0.0889 1.9 6.1 GRS 1915+105 299.8119 35.2807 0.0 36.4 -96.5 -0.0087 -0.1 11.9 Cyg X-1 323.8064 -24.8101 0.3 43.1 15.6 3.6870 35.7 ------ UNKNOWN 342.5633 -19.1773 2.7 57.2 0.3 1.3324 4.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 98.212590 962.124300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 285.1602 -24.8125 4.5 34.9 91.9 2.4455 2.5 9.4 HT1900.1-2455 288.8732 10.9677 4.4 49.4 142.5 4.9082 2.6 4.6 GRS 1915+105 278.6713 -37.6331 4.3 40.2 70.6 4.6530 2.7 ------ UNKNOWN 310.1228 25.6130 2.0 52.2 174.6 7.0258 5.8 ------ UNKNOWN 355.0551 -42.0637 2.5 31.0 -38.3 2.3838 4.6 ------ UNKNOWN 327.4936 34.0831 3.6 59.1 -166.2 9.8530 3.2 ------ UNKNOWN 346.3600 -8.8099 3.1 26.9 -112.6 1.8509 3.7 ------ UNKNOWN 26.5825 -61.8752 3.4 55.5 -20.4 5.3830 3.4 ------ UNKNOWN 13.4612 -49.4526 4.0 45.5 -33.9 2.3371 2.9 ------ UNKNOWN 17.5297 -35.6829 5.0 47.1 -53.3 5.5260 2.3 ------ UNKNOWN 2.7793 -7.3969 4.3 41.1 -98.2 7.6237 2.7 473.9 UNKNOWN