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 12 23:13:52 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger539866
======================================================================
Trigger: 00539866 Segment: 000
BAT Trigger Time: 375771947.136 [s; MET]
Trigger Stop: 375771948.16 [s; MET]
UTC: 2012-11-28T05:05:37.212960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 300.582775438788 Dec: 54.3214660612968 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.3
Image Trigger?: NO
Rate S/N Ratio: 9.79795897113271 [ if not an image trigger ]
Image S/N Ratio: 7.3
Analysis Position: [ source = BAT ]
RA: 300.582775438788 Dec: 54.3214660612968 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 300.588451186717 Dec: 54.2997324101534 [deg; J2000]
{ 20h 02m 21.2s , +54d 17' 59.0" }
+/- 0.666858407985102 [arcmin] (estimated 90% radius based on SNR)
+/- 0.17375182840517 [arcmin] (formal 1-sigma fit error)
SNR: 54.2623885353922
Angular difference between the analysis and refined position is 1.319066 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 23.4279999732971 +/- 1.64951387437372
Measured from: 13.0920000076294
to: 36.5199999809265 [s; relative to TRIGTIME]
T50: 7.39199995994568 +/- 0.447571198196601
Measured from: 17.5160000324249
to: 24.9079999923706 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 21.6840000152588
to: 22.6840000152588 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00399994850158691
to: 41.688000023365 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.401324 4.226054 2.523560 0.402360
0.049637 0.052852 0.046621 0.042123 [error]
Peak 0.339884 0.583450 0.550563 0.101145
0.011306 0.013838 0.013615 0.008793 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 41.692 -0.004 41.688
T90 23.428 13.092 36.520
T50 7.392 17.516 24.908
Peak 1.000 21.684 22.684
====== 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: CPL)
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 -1.860 -0.040 0.040 - - - 1.59e-02 -3.28e-04 3.28e-04 62.400 57
CPL -1.318 -0.179 0.186 64.923 -5.394 8.462 2.88e-02 -5.05e-03 6.42e-03 33.850 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
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 -1.287 -0.048 0.048 - - - 1.09e-01 -3.06e-03 3.06e-03 81.040 57
CPL -0.495 -0.219 0.230 107.708 -12.373 20.023 2.47e-01 -4.89e-02 6.41e-02 38.690 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 1.19e-06 1.76e-06 1.94e-06 4.01e-06 6.10e-06 8.89e-06 erg/cm2
90%_error_low -4.70e-08 -3.98e-08 -5.22e-08 -2.39e-07 -1.26e-07 -2.71e-07 erg/cm2
90%_error_hi 4.78e-08 3.97e-08 5.22e-08 2.49e-07 1.26e-07 2.78e-07 erg/cm2
Peak flux PL 9.96e-04 1.23e-02 8.27e-02 1.26e+01 3.55e-01 1.26e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 1.05e-06 1.81e-06 1.98e-06 2.04e-06 5.83e-06 6.89e-06 erg/cm2
90%_error_low -6.13e-08 -4.41e-08 -5.67e-08 -3.66e-07 -1.52e-07 -4.04e-07 erg/cm2
90%_error_hi 6.25e-08 4.43e-08 5.69e-08 4.65e-07 1.52e-07 4.94e-07 erg/cm2
Peak flux CPL 2.97e+00 4.34e+00 3.74e+00 2.44e+00 1.25e+01 1.35e+01 ph/cm2/s
90%_error_low -2.49e-01 -1.55e-01 -1.40e-01 -3.67e-01 -4.00e-01 -5.60e-01 ph/cm2/s
90%_error_hi 2.55e-01 1.55e-01 1.42e-01 4.42e-01 4.02e-01 6.02e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 300.5885 54.2997 0.0035 24.5790 175.5194 4.1774645 54.262 TRIG_00539866 Foreground time interval of the image: -0.004 20.365 (delta_t = 20.369 [sec]) Background time interval of the image: -239.136 -0.004 (delta_t = 239.132 [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 -0.004 sec. to 41.688 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.8598 ( -0.0402425 0.0401202 ) Norm@50keV : 1.59180E-02 ( -0.000328262 0.000328061 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.40 using 59 PHA bins. # Reduced chi-squared = 1.095 for 57 degrees of freedom # Null hypothesis probability = 2.903996e-01 Photon flux (15-150 keV) in 41.69 sec: 2.24654 ( -0.05379 0.05403 ) ph/cm2/s Energy fluence (15-150 keV) : 6.10212e-06 ( -1.26106e-07 1.26354e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 41.688 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.31845 ( -0.179162 0.186476 ) Epeak [keV] : 64.9227 ( -5.39422 8.4619 ) Norm@50keV : 2.88377E-02 ( -0.0050475 0.00641864 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 33.85 using 59 PHA bins. # Reduced chi-squared = 0.6044 for 56 degrees of freedom # Null hypothesis probability = 9.916379e-01 Photon flux (15-150 keV) in 41.69 sec: 2.13708 ( -0.06255 0.06304 ) ph/cm2/s Energy fluence (15-150 keV) : 5.83043e-06 ( -1.52345e-07 1.52197e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 21.684 sec. to 22.684 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.28674 ( -0.0479102 0.0479048 ) Norm@50keV : 0.108700 ( -0.00306498 0.00306489 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 81.04 using 59 PHA bins. # Reduced chi-squared = 1.422 for 57 degrees of freedom # Null hypothesis probability = 1.989032e-02 Photon flux (15-150 keV) in 1 sec: 0.355356 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.0778e-06 ( -3.26226e-08 3.26525e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.684 sec. to 22.684 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.495255 ( -0.219276 0.229842 ) Epeak [keV] : 107.708 ( -12.3732 20.0233 ) Norm@50keV : 0.246695 ( -0.04887 0.0640945 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.69 using 59 PHA bins. # Reduced chi-squared = 0.6909 for 56 degrees of freedom # Null hypothesis probability = 9.622937e-01 Photon flux (15-150 keV) in 1 sec: 12.4615 ( -0.4004 0.4018 ) ph/cm2/s Energy fluence (15-150 keV) : 1.04311e-06 ( -3.46701e-08 3.45953e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 23.428 sec. Hardness ratio (energy fluence ratio) = 1.09647817337
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.860075e-06 S(50-150 keV) = 2.9703467e-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 = -4.559939090212756E-01, IMY = -3.573238866592082E-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: -239.136000 -0.004000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4636 35.3902 363.3 28.8 -95.5 0.0104 0.0 2.9 Her X-1 299.4137 35.1605 5.0 39.4 -160.8 0.7763 2.3 9.0 Cyg X-1 308.1338 40.9383 2.1 38.0 -175.0 1.6449 5.6 1.4 Cyg X-3 326.0407 38.3058 9.1 47.9 170.4 0.7221 1.3 6.2 Cyg X-2 324.4723 38.3784 2.2 47.2 171.7 2.7000 5.3 ------ UNKNOWN 324.4807 34.0491 2.2 50.8 174.8 3.3945 5.2 ------ UNKNOWN 289.9090 29.7618 2.6 40.8 -145.9 1.6792 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.004000 20.364600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5905 35.1948 25.6 29.0 -95.7 -0.0473 -0.5 11.0 Her X-1 299.4400 35.1441 8.8 39.4 -160.8 -0.1285 -1.3 8.1 Cyg X-1 308.0446 41.0376 4.1 37.9 -175.0 0.2798 2.8 5.9 Cyg X-3 326.2638 38.4253 13.8 47.9 170.1 -0.1406 -0.8 7.6 Cyg X-2 300.5884 54.2997 0.2 24.6 175.5 4.1775 54.3 ------ UNKNOWN 240.1661 58.3451 2.6 9.3 -39.2 0.2887 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 66.364620 962.932300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5338 35.4180 13.2 36.8 -62.1 -1.0880 -0.9 5.9 Her X-1 288.8183 10.9899 3.5 44.3 -123.8 9.0904 3.3 2.9 GRS 1915+105 299.7231 35.2986 3.7 19.0 -138.3 2.0112 3.1 8.7 Cyg X-1 308.1347 40.9689 1.1 14.3 -164.1 6.2916 10.9 1.5 Cyg X-3 326.2087 38.3983 5.1 23.6 161.6 1.3635 2.3 4.9 Cyg X-2 212.3328 46.2186 3.5 53.2 -20.1 4.8652 3.3 ------ UNKNOWN 210.3564 44.4269 3.7 55.4 -20.5 7.3215 3.2 ------ UNKNOWN 287.3865 21.7007 3.2 34.1 -118.2 3.7002 3.7 ------ UNKNOWN 314.4495 -2.4559 6.3 57.9 -156.8 8.2435 1.8 ------ UNKNOWN 215.7508 39.3165 5.1 56.3 -28.3 7.7806 2.3 ------ UNKNOWN 240.7347 32.3055 5.0 47.0 -53.0 7.2966 2.4 ------ UNKNOWN 273.0770 18.8825 3.6 41.2 -98.9 12.6728 3.3 ------ UNKNOWN