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 23:02:20 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger323898
======================================================================
Trigger: 00323898 Segment: 000
BAT Trigger Time: 242326548.48 [s; MET]
Trigger Stop: 242326550.528 [s; MET]
UTC: 2008-09-05T16:55:45.405420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 301.72269381416 Dec: -62.5711596742389 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.01
Image Trigger?: NO
Rate S/N Ratio: 15.7797338380595 [ if not an image trigger ]
Image S/N Ratio: 8.01
Analysis Position: [ source = BAT ]
RA: 301.72269381416 Dec: -62.5711596742389 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 301.754461576474 Dec: -62.5736454178581 [deg; J2000]
{ 20h 07m 01.1s , -62d 34' 25.1" }
+/- 1.76469757091916 [arcmin] (estimated 90% radius based on SNR)
+/- 0.744304482374927 [arcmin] (formal 1-sigma fit error)
SNR: 13.5123925794075
Angular difference between the analysis and refined position is 0.890564 arcmin
Partial Coding Fraction: 0.3789062 [ including projection effects ]
Duration
T90: 120.936000019312 +/- 28.0583333245587
Measured from: 0.412000000476837
to: 121.348000019789 [s; relative to TRIGTIME]
T50: 77.863999992609 +/- 4.54336660090605
Measured from: 5.37600001692772
to: 83.2400000095367 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.45600000023842
to: 3.45600000023842 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.727999985218048
to: 149.692000001669 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.927172 1.140975 0.793344 0.163443
0.080699 0.080492 0.068641 0.058955 [error]
Peak 0.050674 0.059996 0.063534 0.016283
0.010242 0.010187 0.009243 0.007644 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 150.420 -0.728 149.692
T90 120.936 0.412 121.348
T50 77.864 5.376 83.240
Peak 1.000 2.456 3.456
====== 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 -1.655 -0.144 0.142 - - - 1.29e-03 -1.07e-04 1.06e-04 62.310 57
CPL -1.579 -0.766 0.551 256.097 -256.097 -256.097 1.41e-03 -7.98e-04 1.26e-03 62.260 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
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 -1.439 -0.292 0.289 - - - 1.32e-02 -2.09e-03 2.08e-03 72.450 57
CPL -1.432 -0.297 0.963 9998.770 -9998.770 -9998.770 1.32e-02 -2.08e-03 2.16e-02 72.460 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 2.87e-07 4.80e-07 6.10e-07 1.55e-06 1.81e-06 2.93e-06 erg/cm2
90%_error_low -3.75e-08 -3.88e-08 -6.74e-08 -3.36e-07 -1.58e-07 -3.96e-07 erg/cm2
90%_error_hi 3.88e-08 3.87e-08 6.71e-08 3.94e-07 1.60e-07 4.41e-07 erg/cm2
Peak flux PL 5.11e-01 5.34e-01 3.94e-01 4.68e-01 1.62e+00 1.91e+00 ph/cm2/s
90%_error_low -1.49e-01 -1.00e-01 -7.54e-02 -1.67e-01 -2.73e-01 -3.02e-01 ph/cm2/s
90%_error_hi 1.66e-01 9.75e-02 7.33e-02 2.13e-01 2.75e-01 3.03e-01 ph/cm2/s
Fluence CPL 2.84e-07 4.84e-07 6.13e-07 1.37e-06 1.80e-06 2.75e-06 erg/cm2
90%_error_low -4.37e-08 -4.18e-08 -6.90e-08 -7.57e-07 -1.75e-07 -7.77e-07 erg/cm2
90%_error_hi 3.74e-08 4.73e-08 7.05e-08 2.55e-07 1.68e-07 3.08e-07 erg/cm2
Peak flux CPL 4.09e-01 3.12e-01 1.64e-01 1.49e-01 9.40e-01 1.03e+00 ph/cm2/s
90%_error_low -1.81e-01 -5.79e-02 -8.98e-02 -6.86e-02 -2.03e-01 -5.68e-01 ph/cm2/s
90%_error_hi 1.17e-01 6.02e-02 6.71e-02 3.89e-02 1.74e-01 4.52e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 301.7545 -62.5736 0.0142 44.7677 177.6964 1.2740764 13.512 TRIG_00323898 Foreground time interval of the image: -0.728 25.221 (delta_t = 25.949 [sec]) Background time interval of the image: -239.480 -0.728 (delta_t = 238.752 [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 -0.728 sec. to 149.692 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.65476 ( -0.144024 0.142114 ) Norm@50keV : 1.29328E-03 ( -0.000107045 0.000106193 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.31 using 59 PHA bins. # Reduced chi-squared = 1.093 for 57 degrees of freedom # Null hypothesis probability = 2.930122e-01 Photon flux (15-150 keV) in 150.4 sec: 0.169143 ( -0.013638 0.013672 ) ph/cm2/s Energy fluence (15-150 keV) : 1.80841e-06 ( -1.58129e-07 1.59558e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.728 sec. to 149.692 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.57916 ( -0.765394 0.551944 ) Epeak [keV] : 256.097 ( -276.855 -276.855 ) Norm@50keV : 1.41442E-03 ( -0.000796142 0.00125938 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.26 using 59 PHA bins. # Reduced chi-squared = 1.112 for 56 degrees of freedom # Null hypothesis probability = 2.632095e-01 Photon flux (15-150 keV) in 150.4 sec: 0.168526 ( -0.014261 0.014081 ) ph/cm2/s Energy fluence (15-150 keV) : 1.79749e-06 ( -1.75464e-07 1.67714e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.456 sec. to 3.456 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.43876 ( -0.29177 0.289103 ) Norm@50keV : 1.31756E-02 ( -0.00208904 0.00208491 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.45 using 59 PHA bins. # Reduced chi-squared = 1.271 for 57 degrees of freedom # Null hypothesis probability = 8.147226e-02 Photon flux (15-150 keV) in 1 sec: 1.61927 ( -0.27342 0.27509 ) ph/cm2/s Energy fluence (15-150 keV) : 1.2636e-07 ( -2.14154e-08 2.15168e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.456 sec. to 3.456 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.43168 ( -0.294152 0.965613 ) Epeak [keV] : 9998.77 ( -9999.36 -9999.36 ) Norm@50keV : 1.32113E-02 ( -0.00209393 0.0216316 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.46 using 59 PHA bins. # Reduced chi-squared = 1.294 for 56 degrees of freedom # Null hypothesis probability = 6.861492e-02 Photon flux (15-150 keV) in 1 sec: 0.940194 ( -0.202576 0.173586 ) ph/cm2/s Energy fluence (15-150 keV) : 5.77019e-08 ( -3.21972e-08 2.66529e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 120.936 sec. Hardness ratio (energy fluence ratio) = 1.27042787783
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.675079e-07 S(50-150 keV) = 1.0409042e-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 = -9.911229326485734E-01, IMY = -3.986939987938913E-02
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: -239.480000 -0.728000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9680 -15.6343 1.1 40.8 -85.4 7.7834 10.0 0.8 Sco X-1 255.9934 -37.8500 0.5 33.5 -124.4 6.7367 24.8 0.5 4U 1700-377 256.5336 -36.4341 8.9 32.5 -122.3 0.3557 1.3 4.8 GX 349+2 262.8457 -24.6985 15.0 23.7 -101.8 0.1683 0.8 9.3 GX 1+4 264.6071 -44.5766 7.7 32.1 -141.5 0.3053 1.5 9.6 4U 1735-44 268.3421 -1.3863 2.0 25.8 -42.7 1.0745 5.8 4.3 SW J1753.5-0127 270.3794 -25.1720 4.8 17.2 -107.7 0.4185 2.4 7.6 GX 5-1 270.3382 -25.8853 7.7 17.5 -109.9 0.2587 1.5 8.7 GRS 1758-258 274.1365 -14.1751 4.4 13.8 -65.3 0.4569 2.6 11.3 GX 17+2 275.8198 -30.2327 2.3 15.6 -131.9 0.7965 5.0 9.7 H1820-303 284.8704 -24.9192 6.1 6.6 -150.3 0.3193 1.9 9.0 HT1900.1-2455 288.8009 10.9456 0.7 29.8 9.1 3.6656 17.1 0.2 GRS 1915+105 262.9868 -33.8367 2.2 26.6 -122.3 1.0982 5.2 0.2 GX 354-0 294.1953 10.7979 3.3 30.4 19.6 0.7387 3.5 ------ UNKNOWN 293.2212 14.7006 2.4 34.0 16.5 1.0517 4.9 ------ UNKNOWN 264.2293 26.6995 2.0 50.9 -20.4 2.4681 5.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.728000 25.220590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8088 -15.7399 0.0 41.0 -85.6 -0.3345 -1.6 11.5 Sco X-1 255.9792 -37.8291 15.6 33.5 -124.3 0.0600 0.7 1.0 4U 1700-377 256.4517 -36.4233 5.3 32.5 -122.3 0.1767 2.2 0.8 GX 349+2 262.8435 -24.7725 174.0 23.8 -102.0 0.0042 0.1 9.2 GX 1+4 264.5532 -44.3824 6.5 32.0 -141.1 -0.1103 -1.8 9.1 4U 1735-44 268.4504 -1.3956 7.3 25.7 -42.5 0.0912 1.6 6.0 SW J1753.5-0127 270.2557 -25.0926 6.5 17.3 -107.3 -0.0954 -1.8 1.7 GX 5-1 270.1981 -25.8598 3.9 17.6 -109.7 -0.1626 -3.0 9.0 GRS 1758-258 273.9164 -13.8953 4.7 14.1 -64.5 -0.1341 -2.4 9.9 GX 17+2 276.0870 -30.2178 0.0 15.5 -132.5 0.0267 0.5 12.3 H1820-303 284.8840 -25.0376 9.6 6.7 -150.8 -0.0583 -1.2 10.8 HT1900.1-2455 288.8525 11.0167 4.0 29.9 9.1 -0.1686 -2.9 5.3 GRS 1915+105 262.8113 -33.9038 8.8 26.7 -122.3 -0.0814 -1.3 9.8 GX 354-0 322.1499 2.3262 2.5 40.0 68.5 0.8311 4.6 ------ UNKNOWN 301.7545 -62.5737 0.9 44.8 177.7 1.2739 13.5 ------ UNKNOWN 281.6138 -68.9887 1.9 50.3 -170.3 0.6779 6.1 ------ UNKNOWN 264.9394 31.3239 2.0 54.7 -17.0 0.9438 5.7 ------ UNKNOWN 241.6019 -35.7443 1.9 43.8 -115.5 1.2984 6.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 92.020600 779.120600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.9934 -37.8415 0.4 37.0 -28.6 13.4808 29.0 0.4 4U 1700-377 256.5913 -36.4124 10.2 37.9 -26.7 0.5562 1.1 7.6 GX 349+2 263.0266 -24.8286 5.3 45.6 -11.2 1.3499 2.2 5.1 GX 1+4 264.9265 -44.5593 9.0 27.7 -25.5 0.4392 1.3 10.2 4U 1735-44 270.3090 -25.2299 33.5 42.8 -2.6 0.2111 0.3 9.1 GX 5-1 270.1926 -25.7724 2.6 42.3 -3.1 2.6124 4.4 6.2 GRS 1758-258 273.8943 -14.0264 7.8 52.4 6.5 1.5320 1.5 6.5 GX 17+2 275.8603 -30.3675 2.1 36.2 1.8 2.4760 5.4 3.3 H1820-303 285.0613 -24.8943 3.6 39.3 17.1 1.6140 3.2 2.1 HT1900.1-2455 262.9691 -33.8509 1.9 37.5 -17.2 2.7834 6.1 1.4 GX 354-0 283.8035 -30.3357 3.0 34.2 13.2 1.5251 3.8 ------ UNKNOWN 283.4629 -66.5727 2.7 8.8 -83.9 1.4837 4.3 ------ UNKNOWN