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 07:26:32 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger510922
======================================================================
Trigger: 00510922 Segment: 000
BAT Trigger Time: 347163362.752 [s; MET]
Trigger Stop: 347163366.848 [s; MET]
UTC: 2012-01-02T02:15:55.012820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 276.200903597835 Dec: 24.7316362946046 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.2
Image Trigger?: NO
Rate S/N Ratio: 12.2882057274445 [ if not an image trigger ]
Image S/N Ratio: 9.2
Analysis Position: [ source = BAT ]
RA: 276.200903597835 Dec: 24.7316362946046 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 276.223711834673 Dec: 24.7133789997417 [deg; J2000]
{ 18h 24m 53.7s , +24d 42' 48.2" }
+/- 0.619529468185137 [arcmin] (estimated 90% radius based on SNR)
+/- 0.22738095638862 [arcmin] (formal 1-sigma fit error)
SNR: 60.2799260066436
Angular difference between the analysis and refined position is 1.656862 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 38.7080000042915 +/- 3.50732263817963
Measured from: 6.52799999713898
to: 45.2360000014305 [s; relative to TRIGTIME]
T50: 4.86799991130829 +/- 0.4040792083472
Measured from: 30.8200000524521
to: 35.6879999637604 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 32.7520000338554
to: 33.7520000338554 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.76800000667572
to: 53.9399999976158 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.946801 2.644586 1.825753 0.516178
0.053010 0.054789 0.047970 0.037758 [error]
Peak 0.272516 0.439698 0.405326 0.135456
0.011153 0.013263 0.012793 0.009329 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 53.172 0.768 53.940
T90 38.708 6.528 45.236
T50 4.868 30.820 35.688
Peak 1.000 32.752 33.752
====== 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 -1.590 -0.052 0.052 - - - 8.68e-03 -2.34e-04 2.34e-04 55.990 57
CPL -1.588 -0.052 0.053 9999.360 -9999.360 -9999.360 8.69e-03 -2.27e-04 1.60e-03 56.010 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 -1.220 -0.062 0.062 - - - 8.66e-02 -2.91e-03 2.91e-03 63.860 57
CPL -1.217 -0.061 0.064 9999.360 -9999.360 -9999.360 8.69e-02 -2.75e-03 1.84e-02 63.900 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 6.41e-07 1.11e-06 1.48e-06 4.02e-06 4.32e-06 7.26e-06 erg/cm2
90%_error_low -3.43e-08 -3.44e-08 -5.06e-08 -3.08e-07 -1.22e-07 -3.36e-07 erg/cm2
90%_error_hi 3.51e-08 3.43e-08 5.05e-08 3.25e-07 1.22e-07 3.49e-07 erg/cm2
Peak flux PL 6.64e-04 1.01e-02 1.14e-01 1.01e+01 5.29e-01 9.90e+00 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 6.40e-07 1.11e-06 1.48e-06 4.01e-06 4.33e-06 7.33e-06 erg/cm2
90%_error_low N/A -3.86e-08 -5.68e-08 N/A -1.50e-07 -1.19e-06 erg/cm2
90%_error_hi N/A 4.22e-08 6.44e-08 N/A 1.33e-07 1.62e-07 erg/cm2
Peak flux CPL 2.73e+00 3.24e+00 2.78e+00 4.20e+00 1.02e+01 1.30e+01 ph/cm2/s
90%_error_low N/A -1.38e-01 N/A -9.38e-01 -5.81e-01 -1.03e+00 ph/cm2/s
90%_error_hi N/A 1.35e-01 N/A 5.94e-02 4.06e-01 2.83e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 276.2237 24.7134 0.0032 29.5089 -27.3265 5.9343614 60.280 TRIG_00510922 Foreground time interval of the image: 0.768 36.149 (delta_t = 35.381 [sec]) Background time interval of the image: -170.851 0.768 (delta_t = 171.619 [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 0.768 sec. to 53.940 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.58977 ( -0.0523504 0.0523032 ) Norm@50keV : 8.67504E-03 ( -0.000233633 0.000233562 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.99 using 59 PHA bins. # Reduced chi-squared = 0.9823 for 57 degrees of freedom # Null hypothesis probability = 5.128854e-01 Photon flux (15-150 keV) in 53.17 sec: 1.11132 ( -0.03351 0.03368 ) ph/cm2/s Energy fluence (15-150 keV) : 4.31973e-06 ( -1.21789e-07 1.21941e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.768 sec. to 53.940 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.58828 ( -0.0521394 0.053186 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 8.68955E-03 ( -0.000233968 0.00159803 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.01 using 59 PHA bins. # Reduced chi-squared = 1.000 for 56 degrees of freedom # Null hypothesis probability = 4.745863e-01 Photon flux (15-150 keV) in 53.17 sec: 1.11354 ( -0.04262 0.03627 ) ph/cm2/s Energy fluence (15-150 keV) : 4.3276e-06 ( -1.49806e-07 1.32935e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 32.752 sec. to 33.752 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2205 ( -0.0616772 0.0618537 ) Norm@50keV : 8.66305E-02 ( -0.00291148 0.00291074 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.86 using 59 PHA bins. # Reduced chi-squared = 1.120 for 57 degrees of freedom # Null hypothesis probability = 2.480569e-01 Photon flux (15-150 keV) in 1 sec: 0.529213 ( ) ph/cm2/s Energy fluence (15-150 keV) : 8.73997e-07 ( -3.20011e-08 3.20693e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 32.752 sec. to 33.752 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.21732 ( -0.0612805 0.0633454 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 8.68671E-02 ( -0.00291977 0.0182317 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.90 using 59 PHA bins. # Reduced chi-squared = 1.141 for 56 degrees of freedom # Null hypothesis probability = 2.188651e-01 Photon flux (15-150 keV) in 1 sec: 10.2171 ( -0.58125 0.4064 ) ph/cm2/s Energy fluence (15-150 keV) : 8.75649e-07 ( -4.34255e-08 3.94119e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 38.708 sec. Hardness ratio (energy fluence ratio) = 1.32892355862
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.7554068e-06 S(50-150 keV) = 2.564323e-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 = 5.028183394531438E-01, IMY = 2.598187050693557E-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: -170.851400 0.768000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3714 35.2953 4.5 49.2 -12.8 0.8510 2.6 5.1 Her X-1 288.8029 10.9421 1.0 20.2 -65.8 2.1121 11.3 0.3 GRS 1915+105 299.6010 35.2056 0.3 17.1 24.0 5.6851 34.6 0.6 Cyg X-1 308.1198 40.9657 1.8 21.3 47.9 1.3556 6.3 0.9 Cyg X-3 326.4318 38.3054 0.0 24.7 84.1 0.3972 1.7 12.3 Cyg X-2 352.5469 16.8036 2.7 42.6 133.4 2.3548 4.3 ------ UNKNOWN 259.8029 7.3501 3.3 48.0 -51.0 2.6471 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.768000 36.148600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4835 35.4435 6.9 49.1 -12.6 0.3126 1.7 6.2 Her X-1 288.7759 11.1552 0.0 20.1 -65.2 0.3132 3.2 12.6 GRS 1915+105 299.8067 35.1803 5.3 17.0 24.4 -0.1914 -2.2 10.7 Cyg X-1 308.0918 40.9868 80.4 21.3 47.9 0.0148 0.1 2.2 Cyg X-3 326.2790 38.2142 45.8 24.5 84.1 0.0320 0.3 8.2 Cyg X-2 333.3791 20.9841 2.8 24.1 129.5 0.4665 4.2 ------ UNKNOWN 350.2908 -20.0273 3.3 57.6 178.2 2.2485 3.5 ------ UNKNOWN 276.2237 24.7134 0.2 29.5 -27.3 5.9343 60.3 ------ UNKNOWN 258.0705 9.2754 1.9 49.0 -47.8 2.4484 5.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 101.348600 962.428000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9612 -15.6312 1.6 50.5 -42.3 24.2019 7.3 1.2 Sco X-1 254.2720 35.3481 5.6 21.7 41.9 1.3251 2.0 9.1 Her X-1 268.3857 -1.4600 2.7 27.2 -65.4 3.4588 4.3 1.2 SW J1753.5-0127 274.0616 -14.1285 3.7 38.9 -79.3 7.0927 3.2 6.4 GX 17+2 288.7680 10.9370 0.8 18.2 -125.8 8.9995 14.5 1.9 GRS 1915+105 299.5915 35.2001 0.2 22.8 154.5 29.4400 48.8 0.1 Cyg X-1 308.1115 40.9575 1.1 31.1 148.1 8.1595 10.2 0.3 Cyg X-3 326.3103 38.3944 7.4 44.3 156.9 2.1268 1.6 7.8 Cyg X-2 226.2909 -7.5887 3.2 58.3 -19.6 11.6139 3.5 ------ UNKNOWN 230.3886 -11.5665 3.8 57.5 -26.3 10.8773 3.1 ------ UNKNOWN