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 21:33:14 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger458448
======================================================================
Trigger: 00458448 Segment: 000
BAT Trigger Time: 333803377.664 [s; MET]
Trigger Stop: 333803378.688 [s; MET]
UTC: 2011-07-31T11:09:30.451760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 280.521297500506 Dec: -28.5459461093081 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 24.57
Image Trigger?: NO
Rate S/N Ratio: 180.740144959552 [ if not an image trigger ]
Image S/N Ratio: 24.57
Analysis Position: [ source = BAT ]
RA: 280.521297500506 Dec: -28.5459461093081 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 280.512368094939 Dec: -28.5362133295957 [deg; J2000]
{ 18h 42m 03.0s , -28d 32' 10.4" }
+/- 0.500584149626214 [arcmin] (estimated 90% radius based on SNR)
+/- 0.152577055392692 [arcmin] (formal 1-sigma fit error)
SNR: 81.7404109867924
Angular difference between the analysis and refined position is 0.750023 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 40.944000005722 +/- 11.5923975164718
Measured from: -0.223999977111816
to: 40.7200000286102 [s; relative to TRIGTIME]
T50: 4.88000005483627 +/- 0.18659046055328
Measured from: 1.08799999952316
to: 5.96800005435944 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.267999947071075
to: 0.732000052928925 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.05599999427795
to: 80.272000014782 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.968187 2.927100 2.852404 0.912127
0.062168 0.060508 0.053608 0.043217 [error]
Peak 0.306313 0.503019 0.457356 0.097500
0.010960 0.012488 0.012017 0.007448 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 81.328 -1.056 80.272
T90 40.944 -0.224 40.720
T50 4.880 1.088 5.968
Peak 1.000 -0.268 0.732
====== 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 -1.149 -0.046 0.046 - - - 7.10e-03 -1.70e-04 1.69e-04 58.300 57
CPL -1.148 -0.043 0.050 9999.360 -9999.360 -9999.360 7.12e-03 -1.61e-04 1.73e-04 58.490 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 -1.288 -0.052 0.052 - - - 9.21e-02 -2.70e-03 2.70e-03 80.740 57
CPL -0.774 -0.214 0.224 135.193 -24.708 54.784 1.57e-01 -3.03e-02 3.96e-02 62.930 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 5.31e-07 1.21e-06 2.18e-06 9.33e-06 5.94e-06 1.33e-05 erg/cm2
90%_error_low -2.84e-08 -3.76e-08 -5.55e-08 -5.74e-07 -1.43e-07 -5.91e-07 erg/cm2
90%_error_hi 2.91e-08 3.75e-08 5.54e-08 6.01e-07 1.43e-07 6.14e-07 erg/cm2
Peak flux PL 6.16e-04 7.14e-03 7.36e-02 1.16e+01 3.15e-01 1.17e+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 5.30e-07 1.21e-06 2.16e-06 9.63e-06 5.98e-06 1.32e-05 erg/cm2
90%_error_low N/A -3.76e-08 -2.87e-08 -1.44e-06 N/A -5.92e-07 erg/cm2
90%_error_hi N/A 3.75e-08 8.24e-08 -3.69e-07 N/A 6.05e-07 erg/cm2
Peak flux CPL 2.71e+00 3.62e+00 3.06e+00 2.50e+00 1.07e+01 1.19e+01 ph/cm2/s
90%_error_low -2.26e-01 -1.34e-01 -1.21e-01 -4.15e-01 -3.57e-01 -5.70e-01 ph/cm2/s
90%_error_hi 2.32e-01 1.34e-01 1.22e-01 5.15e-01 3.58e-01 6.37e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 280.5124 -28.5362 0.0023 16.2420 175.3411 7.8844535 81.740 TRIG_00458448 Foreground time interval of the image: -1.056 15.837 (delta_t = 16.893 [sec]) Background time interval of the image: -239.664 -1.056 (delta_t = 238.608 [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 -1.056 sec. to 80.272 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.14905 ( -0.0455342 0.0457998 ) Norm@50keV : 7.09590E-03 ( -0.000169968 0.000169442 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.30 using 59 PHA bins. # Reduced chi-squared = 1.023 for 57 degrees of freedom # Null hypothesis probability = 4.272711e-01 Photon flux (15-150 keV) in 81.33 sec: 0.827435 ( -0.021378 0.021506 ) ph/cm2/s Energy fluence (15-150 keV) : 5.94334e-06 ( -1.4304e-07 1.432e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.056 sec. to 80.272 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.14397 ( -0.0432774 0.0493277 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 7.13142E-03 ( -0.000170106 0.00016388 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.46 using 59 PHA bins. # Reduced chi-squared = 1.044 for 56 degrees of freedom # Null hypothesis probability = 3.853242e-01 Photon flux (15-150 keV) in 81.33 sec: 0.827131 ( -0.021407 0.021479 ) ph/cm2/s Energy fluence (15-150 keV) : 5.97999e-06 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.268 sec. to 0.732 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2877 ( -0.0518352 0.0518138 ) Norm@50keV : 9.21206E-02 ( -0.00270495 0.00270493 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 80.74 using 59 PHA bins. # Reduced chi-squared = 1.416 for 57 degrees of freedom # Null hypothesis probability = 2.099325e-02 Photon flux (15-150 keV) in 1 sec: 0.315304 ( ) ph/cm2/s Energy fluence (15-150 keV) : 9.13188e-07 ( -2.90908e-08 2.91355e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.268 sec. to 0.732 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.774482 ( -0.214027 0.224204 ) Epeak [keV] : 135.193 ( -24.7078 54.7844 ) Norm@50keV : 0.156661 ( -0.0303461 0.0395677 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.93 using 59 PHA bins. # Reduced chi-squared = 1.124 for 56 degrees of freedom # Null hypothesis probability = 2.445150e-01 Photon flux (15-150 keV) in 1 sec: 10.6686 ( -0.357 0.3577 ) ph/cm2/s Energy fluence (15-150 keV) : 8.90943e-07 ( -3.09795e-08 3.09064e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 40.944 sec. Hardness ratio (energy fluence ratio) = 1.80368223859
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.7413638e-06 S(50-150 keV) = 4.201974e-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 = -2.903595258416043E-01, IMY = -2.366202735736934E-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: -239.664000 -1.056000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9766 -15.6310 0.6 31.8 -95.1 7.2077 19.5 0.6 Sco X-1 254.4345 35.3287 4.0 52.6 -19.4 1.7830 2.9 1.4 Her X-1 255.9684 -37.8595 807.3 31.9 -142.1 -0.0037 -0.0 1.3 4U 1700-377 256.4998 -36.4576 5.3 30.5 -140.8 0.5477 2.2 3.7 GX 349+2 262.9906 -24.5996 16.2 18.4 -128.8 0.1570 0.7 8.8 GX 1+4 264.7283 -44.4443 13.0 33.8 -158.9 0.2363 0.9 0.7 4U 1735-44 268.2914 -1.4281 3.3 14.4 -36.1 0.7359 3.5 4.8 SW J1753.5-0127 270.3016 -25.0350 2.0 14.3 -147.7 1.2109 5.8 2.8 GX 5-1 270.3886 -25.7601 5.7 14.9 -149.4 0.4180 2.0 4.8 GRS 1758-258 274.0136 -14.0284 3.4 3.8 -109.2 0.7364 3.4 0.7 GX 17+2 275.8237 -30.3268 6.1 17.9 -170.5 0.4013 1.9 5.8 H1820-303 284.9898 -24.7755 28.8 14.1 155.9 0.0813 0.4 9.1 HT1900.1-2455 288.7724 10.7983 3.8 25.8 30.3 0.7820 3.1 9.0 GRS 1915+105 263.0461 -33.8541 5.3 25.1 -146.1 0.5014 2.2 3.1 GX 354-0 277.3681 -23.8388 1.9 11.3 -174.4 1.2874 6.0 ------ UNKNOWN 269.2778 31.4927 2.2 44.7 -5.7 1.9469 5.1 ------ UNKNOWN 273.2590 -69.7151 4.4 57.3 -173.8 2.8269 2.6 ------ UNKNOWN 234.3285 -27.3639 4.3 43.1 -112.4 2.5470 2.7 ------ UNKNOWN 236.3702 -2.6884 2.3 42.0 -75.5 4.3438 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.056000 15.836590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9767 -15.5896 5.9 31.8 -95.0 -0.3169 -2.0 3.0 Sco X-1 254.4988 35.5038 7.2 52.8 -19.2 0.4377 1.6 9.9 Her X-1 255.8744 -37.9731 23.1 32.0 -142.1 0.0556 0.5 9.4 4U 1700-377 256.2652 -36.2933 18.4 30.6 -140.3 -0.0715 -0.6 11.3 GX 349+2 262.9481 -24.6324 5.4 18.4 -128.8 0.2081 2.1 7.6 GX 1+4 264.5936 -44.3800 10.3 33.8 -158.7 0.1345 1.1 7.7 4U 1735-44 268.2484 -1.3126 27.2 14.6 -36.0 -0.0388 -0.4 11.1 SW J1753.5-0127 270.3687 -24.9288 9.1 14.2 -147.7 -0.1112 -1.3 10.1 GX 5-1 270.1411 -25.7648 5.6 15.0 -148.6 -0.1775 -2.1 8.8 GRS 1758-258 274.0815 -13.9368 4.2 3.7 -108.3 0.2587 2.8 7.4 GX 17+2 275.7683 -30.4771 7.2 18.0 -170.4 -0.1502 -1.6 10.5 H1820-303 285.2020 -24.9527 5.2 14.3 155.6 0.2221 2.2 9.2 HT1900.1-2455 288.8517 11.0937 4.6 26.1 30.2 0.2919 2.5 9.4 GRS 1915+105 262.8161 -33.6784 0.0 25.1 -145.5 0.0694 0.7 12.7 GX 354-0 295.5105 7.2767 3.1 26.6 47.3 0.4929 3.6 ------ UNKNOWN 287.0849 -48.9998 2.3 37.3 174.2 0.6641 5.1 ------ UNKNOWN 280.5124 -28.5362 0.1 16.2 175.3 7.8846 81.7 ------ UNKNOWN 265.3173 -64.2480 2.1 52.4 -168.9 1.3731 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 55.436620 962.436700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9851 -15.6313 0.4 35.2 -61.9 26.4782 26.2 0.6 Sco X-1 256.0884 -37.7645 2.5 22.3 -106.5 2.7643 4.5 6.8 4U 1700-377 256.4308 -36.4939 2.8 21.7 -103.4 2.4566 4.1 4.3 GX 349+2 262.8681 -24.7451 3.1 16.2 -66.4 2.0775 3.7 7.7 GX 1+4 264.7092 -44.5409 4.1 20.4 -131.8 1.6968 2.9 5.6 4U 1735-44 268.3438 -1.4592 3.8 29.5 -11.1 2.1462 3.1 1.5 SW J1753.5-0127 270.3064 -25.0809 1.3 9.7 -57.4 4.8606 8.7 1.2 GX 5-1 270.2884 -25.8236 4.8 9.5 -61.6 1.3873 2.4 4.9 GRS 1758-258 274.0111 -14.0353 2.6 15.7 -9.7 2.5648 4.4 0.3 GX 17+2 276.0790 -30.2715 5.5 4.2 -101.1 1.2757 2.1 9.8 H1820-303 284.9682 -25.0712 2.7 5.3 64.3 2.4086 4.2 9.8 HT1900.1-2455 288.7477 10.9936 3.6 40.3 26.8 3.4192 3.2 4.1 GRS 1915+105 263.0070 -33.8188 1.9 15.9 -99.6 3.5733 5.9 1.3 GX 354-0 291.2171 -31.9529 2.9 9.9 127.2 2.3364 4.0 ------ UNKNOWN 268.9848 17.6303 3.3 47.5 -0.7 4.0456 3.5 ------ UNKNOWN 255.2337 -41.6679 1.8 24.4 -115.1 4.3051 6.3 ------ UNKNOWN 243.8854 8.0993 2.6 50.9 -35.3 8.4092 4.5 ------ UNKNOWN 215.3373 -71.4919 3.8 55.2 -145.2 12.5677 3.1 ------ UNKNOWN