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 22:23:22 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger453628
======================================================================
Trigger: 00453628 Segment: 000
BAT Trigger Time: 327463943.68 [s; MET]
Trigger Stop: 327463944.704 [s; MET]
UTC: 2011-05-19T02:12:16.711700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 261.628977846193 Dec: -23.4083422668494 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21.44
Image Trigger?: NO
Rate S/N Ratio: 40.8778668719394 [ if not an image trigger ]
Image S/N Ratio: 21.44
Analysis Position: [ source = BAT ]
RA: 261.628977846193 Dec: -23.4083422668494 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 261.636957603195 Dec: -23.4262458176008 [deg; J2000]
{ 17h 26m 32.9s , -23d 25' 34.5" }
+/- 0.692641884703782 [arcmin] (estimated 90% radius based on SNR)
+/- 0.182376804195443 [arcmin] (formal 1-sigma fit error)
SNR: 51.3999885860812
Angular difference between the analysis and refined position is 1.160587 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 27.1839999556541 +/- 2.98085629047885
Measured from: -2.61599999666214
to: 24.567999958992 [s; relative to TRIGTIME]
T50: 10.135999917984 +/- 0.637695861456503
Measured from: 0.76800000667572
to: 10.9039999246597 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.34799998998642
to: 3.34799998998642 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.14800000190735
to: 37.7599999904633 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.776179 3.022404 1.423837 0.266645
0.065012 0.063215 0.052845 0.043201 [error]
Peak 0.188319 0.228446 0.110192 0.018894
0.011848 0.012010 0.009883 0.006925 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 41.908 -4.148 37.760
T90 27.184 -2.616 24.568
T50 10.136 0.768 10.904
Peak 1.000 2.348 3.348
====== 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 -2.088 -0.063 0.062 - - - 1.02e-02 -3.45e-04 3.43e-04 49.690 57
CPL -2.085 -0.150 0.059 9999.360 N/A N/A 1.02e-02 N/A N/A 49.720 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 -1.931 -0.117 0.114 - - - 3.16e-02 -2.41e-03 2.38e-03 74.820 57
CPL -1.171 -0.482 0.551 48.389 -8.274 14.398 8.33e-02 -3.77e-02 8.46e-02 67.070 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 9.52e-07 1.22e-06 1.15e-06 1.91e-06 3.97e-06 5.24e-06 erg/cm2
90%_error_low -5.08e-08 -3.80e-08 -5.44e-08 -1.87e-07 -1.25e-07 -2.32e-07 erg/cm2
90%_error_hi 5.18e-08 3.80e-08 5.45e-08 2.01e-07 1.26e-07 2.41e-07 erg/cm2
Peak flux PL 1.97e+00 1.54e+00 8.07e-01 6.13e-01 4.59e+00 4.93e+00 ph/cm2/s
90%_error_low -1.93e-01 -1.02e-01 -7.95e-02 -1.09e-01 -3.07e-01 -3.24e-01 ph/cm2/s
90%_error_hi 1.97e-01 1.02e-01 7.96e-02 1.22e-01 3.07e-01 3.24e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -5.08e-08 -3.80e-08 -5.44e-08 -1.87e-07 -1.25e-07 -2.32e-07 erg/cm2
90%_error_hi 5.18e-08 3.80e-08 5.45e-08 2.01e-07 1.26e-07 2.41e-07 erg/cm2
Peak flux CPL 1.79e+00 1.67e+00 8.22e-01 2.56e-01 4.47e+00 4.54e+00 ph/cm2/s
90%_error_low -2.23e-01 -1.32e-01 -9.08e-02 -1.12e-01 -3.17e-01 -3.42e-01 ph/cm2/s
90%_error_hi 2.25e-01 1.35e-01 8.99e-02 1.84e-01 3.17e-01 3.56e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 261.6370 -23.4262 0.0037 24.0818 98.6174 7.6999045 51.400 TRIG_00453628 Foreground time interval of the image: -4.148 37.760 (delta_t = 41.908 [sec]) Background time interval of the image: -239.680 -4.148 (delta_t = 235.532 [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 -4.148 sec. to 37.760 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.08813 ( -0.0629512 0.0623051 ) Norm@50keV : 1.02074E-02 ( -0.000344844 0.000343109 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.69 using 59 PHA bins. # Reduced chi-squared = 0.8718 for 57 degrees of freedom # Null hypothesis probability = 7.430047e-01 Photon flux (15-150 keV) in 41.91 sec: 1.59667 ( -0.0543 0.05457 ) ph/cm2/s Energy fluence (15-150 keV) : 3.97089e-06 ( -1.25257e-07 1.25562e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.148 sec. to 37.760 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.08489 ( -0.149269 0.0595235 ) Epeak [keV] : 9999.36 ( ) Norm@50keV : 1.02298E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.71 using 59 PHA bins. # Reduced chi-squared = 0.8878 for 56 degrees of freedom # Null hypothesis probability = 7.102294e-01 Photon flux (15-150 keV) in 41.91 sec: 1.55929 ( -0.06229 0.0626 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.348 sec. to 3.348 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.93051 ( -0.117274 0.114063 ) Norm@50keV : 3.15897E-02 ( -0.00240885 0.00238251 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 74.82 using 59 PHA bins. # Reduced chi-squared = 1.313 for 57 degrees of freedom # Null hypothesis probability = 5.678196e-02 Photon flux (15-150 keV) in 1 sec: 4.59361 ( -0.30726 0.30749 ) ph/cm2/s Energy fluence (15-150 keV) : 2.9061e-07 ( -2.15681e-08 2.17461e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.348 sec. to 3.348 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.17117 ( -0.48208 0.551012 ) Epeak [keV] : 48.3888 ( -8.27418 14.3984 ) Norm@50keV : 8.33099E-02 ( -0.0376907 0.0845842 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.07 using 59 PHA bins. # Reduced chi-squared = 1.198 for 56 degrees of freedom # Null hypothesis probability = 1.478306e-01 Photon flux (15-150 keV) in 1 sec: 4.47004 ( -0.31708 0.31702 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 27.184 sec. Hardness ratio (energy fluence ratio) = 0.940784419067
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.1766054e-06 S(50-150 keV) = 1.794331e-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 = -6.696747458899358E-02, IMY = -4.418953155461618E-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: -239.680000 -4.148000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.7369 -37.8593 0.0 22.4 59.4 -0.3459 -1.3 11.9 4U 1700-377 256.4161 -36.4693 3.4 22.1 63.3 0.9056 3.4 2.9 GX 349+2 262.9761 -24.5623 19.7 22.4 98.5 0.1776 0.6 11.1 GX 1+4 264.9476 -44.4238 7.7 15.8 37.7 0.3328 1.5 8.9 4U 1735-44 268.3674 -1.4542 23.2 39.2 132.7 0.3110 0.5 0.1 SW J1753.5-0127 270.2682 -25.0668 3.9 17.4 111.5 0.7380 3.0 1.1 GX 5-1 270.1250 -25.7214 7.3 17.0 109.8 0.4065 1.6 9.7 GRS 1758-258 274.0063 -14.0343 39.5 25.5 134.7 0.0790 0.3 0.1 GX 17+2 276.0105 -30.3571 4.9 10.1 113.9 0.5178 2.4 4.5 H1820-303 285.1118 -24.7866 8.1 13.1 161.9 0.3339 1.4 9.0 HT1900.1-2455 288.6712 10.9311 3.8 49.0 164.0 1.9959 3.0 7.5 GRS 1915+105 262.8539 -33.9311 65.2 17.7 74.6 -0.0469 -0.2 8.9 GX 354-0 241.2671 -59.0157 3.3 34.5 16.4 1.0342 3.5 ------ UNKNOWN 161.5882 -88.7304 2.7 52.8 -20.5 2.7155 4.2 ------ UNKNOWN 346.2484 -83.3922 2.2 49.3 -29.5 2.6051 5.3 ------ UNKNOWN 339.0685 -45.0037 2.6 41.0 -83.8 6.1994 4.5 ------ UNKNOWN 333.7732 -26.4437 4.2 43.0 -112.2 3.6249 2.7 ------ UNKNOWN 330.1352 -8.2026 3.0 50.9 -135.4 5.8785 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -4.148000 37.760000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 256.0732 -37.7156 4.2 22.1 59.9 -0.3696 -2.7 8.7 4U 1700-377 256.6766 -36.4029 10.6 21.9 63.6 0.1527 1.1 11.7 GX 349+2 263.0295 -24.6090 13.5 22.3 98.5 -0.1211 -0.9 8.3 GX 1+4 265.0240 -44.4121 0.0 15.8 37.7 -0.2627 -2.4 12.3 4U 1735-44 268.3965 -1.4784 5.1 39.2 132.7 0.5975 2.3 2.3 SW J1753.5-0127 270.1971 -25.1294 14.3 17.4 111.2 -0.0961 -0.8 5.6 GX 5-1 270.3244 -25.8612 4.9 16.8 109.9 -0.2751 -2.4 7.2 GRS 1758-258 274.1575 -13.9515 3.7 25.5 135.1 0.4433 3.1 10.2 GX 17+2 276.1578 -30.3005 0.0 10.1 114.6 0.0175 0.2 12.7 H1820-303 285.0449 -24.9215 31.5 13.0 161.7 -0.0368 -0.4 0.5 HT1900.1-2455 288.9096 11.0679 23.0 49.2 164.3 0.1637 0.5 9.8 GRS 1915+105 263.0445 -33.9162 31.8 17.5 74.9 -0.0476 -0.4 5.6 GX 354-0 255.4561 -8.9650 1.7 38.8 108.9 2.4865 6.7 ------ UNKNOWN 261.6370 -23.4262 0.2 24.1 98.6 7.6992 51.1 ------ UNKNOWN 197.0454 -75.2655 2.2 52.8 -3.2 1.5754 5.1 ------ UNKNOWN 2.5407 -72.1826 2.5 50.7 -44.6 1.9961 4.6 ------ UNKNOWN 351.8269 -65.7016 2.4 46.9 -53.2 1.7160 4.8 ------ UNKNOWN 334.5148 -30.0963 2.4 41.9 -107.0 1.6699 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 224.820590 962.415100 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 34.5808 -56.8957 3.4 45.8 38.1 4.5865 3.3 ------ UNKNOWN 51.7303 -30.2509 3.1 34.9 -4.7 2.0104 3.7 ------ UNKNOWN 73.7304 -25.9709 3.4 52.8 -17.1 3.5536 3.4 ------ UNKNOWN 70.0275 -22.3136 3.3 49.3 -21.5 3.1829 3.5 ------ UNKNOWN 78.7984 -18.4159 4.4 57.5 -26.3 7.3742 2.6 ------ UNKNOWN 2.8954 40.5360 4.8 55.3 -145.2 8.3914 2.5 ------ UNKNOWN 69.8453 -4.6791 3.9 50.7 -44.5 6.9282 3.0 ------ UNKNOWN 33.0565 28.2731 3.2 43.1 -112.2 8.1569 3.6 ------ UNKNOWN