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 23:46:54 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger536831
======================================================================
Trigger: 00536831 Segment: 000
BAT Trigger Time: 373015959.552 [s; MET]
Trigger Stop: 373015960.576 [s; MET]
UTC: 2012-10-27T07:32:29.746680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 63.6104836572932 Dec: -58.8014814868824 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.88
Image Trigger?: NO
Rate S/N Ratio: 13.8202749610853 [ if not an image trigger ]
Image S/N Ratio: 7.88
Analysis Position: [ source = BAT ]
RA: 63.6104836572932 Dec: -58.8014814868824 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 63.5952048806683 Dec: -58.8334460657927 [deg; J2000]
{ 04h 14m 22.8s , -58d 50' 00.4" }
+/- 0.908337518372024 [arcmin] (estimated 90% radius based on SNR)
+/- 0.318947753563983 [arcmin] (formal 1-sigma fit error)
SNR: 34.8951574009833
Angular difference between the analysis and refined position is 1.975737 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 80.0879999399185 +/- 40.7568951405407
Measured from: -4.54799997806549
to: 75.539999961853 [s; relative to TRIGTIME]
T50: 39.9239999651909 +/- 6.52294532357254
Measured from: 3.37999999523163
to: 43.3039999604225 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2
to: 3 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.33999997377396
to: 135.356000006199 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.355095 1.537651 0.921238 0.205047
0.066073 0.068031 0.059614 0.051341 [error]
Peak 0.058193 0.057845 0.035330 0.013256
0.006494 0.006802 0.006068 0.004820 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 144.696 -9.340 135.356
T90 80.088 -4.548 75.540
T50 39.924 3.380 43.304
Peak 1.000 2.000 3.000
====== 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 -1.813 -0.103 0.102 - - - 1.65e-03 -9.92e-05 9.83e-05 45.290 57
CPL -1.580 -0.341 0.413 82.462 -32.413 -82.462 2.20e-03 -6.27e-04 1.43e-03 44.200 56
=== 1-s peak 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 -1.667 -0.246 0.239 - - - 9.85e-03 -1.40e-03 1.36e-03 57.560 57
CPL -1.680 -0.234 0.274 9999.350 -9999.340 -9999.350 9.82e-03 -8.35e-03 -2.73e-03 57.580 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 4.10e-07 6.23e-07 7.09e-07 1.54e-06 2.20e-06 3.28e-06 erg/cm2
90%_error_low -3.52e-08 -3.33e-08 -5.85e-08 -2.51e-07 -1.34e-07 -3.06e-07 erg/cm2
90%_error_hi 3.60e-08 3.33e-08 5.88e-08 2.83e-07 1.35e-07 3.31e-07 erg/cm2
Peak flux PL 4.76e-01 4.34e-01 2.73e-01 2.63e-01 1.29e+00 1.45e+00 ph/cm2/s
90%_error_low -9.66e-02 -5.51e-02 -5.17e-02 -8.88e-02 -1.62e-01 -1.84e-01 ph/cm2/s
90%_error_hi 1.01e-01 5.48e-02 5.13e-02 1.14e-01 1.62e-01 1.86e-01 ph/cm2/s
Fluence CPL 4.19e-07 5.66e-07 5.88e-07 1.37e-06 1.95e-06 2.70e-06 erg/cm2
90%_error_low -4.01e-08 -5.26e-08 -5.82e-08 -8.11e-07 -1.75e-07 N/A erg/cm2
90%_error_hi 2.55e-08 2.53e-08 5.35e-08 2.46e-07 1.70e-07 N/A erg/cm2
Peak flux CPL 4.39e-01 3.37e-01 1.81e-01 1.67e-01 1.02e+00 1.12e+00 ph/cm2/s
90%_error_low -1.17e-01 -8.42e-02 -2.70e-02 -4.14e-02 -2.45e-01 -2.18e-01 ph/cm2/s
90%_error_hi 1.05e-01 6.63e-02 2.54e-02 3.29e-02 1.91e-01 1.77e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 63.5952 -58.8334 0.0055 23.6638 156.4310 2.0164599 34.895 TRIG_00536831 Foreground time interval of the image: -9.340 11.749 (delta_t = 21.089 [sec]) Background time interval of the image: -239.552 -9.340 (delta_t = 230.212 [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 -9.340 sec. to 135.356 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.8133 ( -0.103223 0.101532 ) Norm@50keV : 1.65202E-03 ( -9.91706e-05 9.82527e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.29 using 59 PHA bins. # Reduced chi-squared = 0.7946 for 57 degrees of freedom # Null hypothesis probability = 8.683033e-01 Photon flux (15-150 keV) in 144.7 sec: 0.228842 ( -0.01245 0.012467 ) ph/cm2/s Energy fluence (15-150 keV) : 2.20008e-06 ( -1.33942e-07 1.35147e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.340 sec. to 135.356 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.58021 ( -0.340545 0.41345 ) Epeak [keV] : 82.4624 ( -32.4126 -82.4625 ) Norm@50keV : 2.20385E-03 ( -0.000627014 0.00143364 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.20 using 59 PHA bins. # Reduced chi-squared = 0.7893 for 56 degrees of freedom # Null hypothesis probability = 8.728695e-01 Photon flux (15-150 keV) in 144.7 sec: 0.225775 ( -0.013385 0.013378 ) ph/cm2/s Energy fluence (15-150 keV) : 1.9459e-06 ( -1.75183e-07 1.69826e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.000 sec. to 3.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.66714 ( -0.24625 0.239154 ) Norm@50keV : 9.84652E-03 ( -0.00140378 0.00136352 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.56 using 59 PHA bins. # Reduced chi-squared = 1.010 for 57 degrees of freedom # Null hypothesis probability = 4.544195e-01 Photon flux (15-150 keV) in 1 sec: 1.29313 ( -0.16169 0.16178 ) ph/cm2/s Energy fluence (15-150 keV) : 9.14387e-08 ( -1.37407e-08 1.40048e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.000 sec. to 3.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.52496 ( -0.234668 0.2726 ) Epeak [keV] : 176.595 ( -9999.35 -9999.36 ) Norm@50keV : 3.61952E-03 ( -0.002152 0.00347226 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.04 using 59 PHA bins. # Reduced chi-squared = 0.9829 for 56 degrees of freedom # Null hypothesis probability = 5.111123e-01 Photon flux (15-150 keV) in 1 sec: 1.02380 ( -0.245255 0.19094 ) ph/cm2/s Energy fluence (15-150 keV) : 5.12366e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 80.088 sec. Hardness ratio (energy fluence ratio) = 1.13820373186
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.0324707e-06 S(50-150 keV) = 1.1676067e-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 = -4.016588797146752E-01, IMY = -1.752219331109239E-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: -239.552000 -9.340000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 35.3181 -49.3406 2.7 25.0 109.6 1.0001 4.3 ------ UNKNOWN 106.9755 -45.6353 2.0 48.1 -175.2 2.0386 5.8 ------ UNKNOWN 116.6008 -45.8831 3.3 50.5 -167.0 1.5673 3.5 ------ UNKNOWN 193.8585 -76.6885 2.7 31.0 -105.3 1.1198 4.3 ------ UNKNOWN 266.8881 -50.2341 3.1 47.4 -49.1 2.7053 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -9.340000 11.748590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 18.0894 -60.2865 1.8 12.2 85.5 0.3537 6.3 ------ UNKNOWN 93.0072 -42.0901 2.3 47.2 170.4 0.6493 5.1 ------ UNKNOWN 63.5952 -58.8334 0.3 23.7 156.4 2.0162 34.9 ------ UNKNOWN 326.3690 -80.8268 3.0 13.2 -74.8 0.2009 3.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 56.548600 962.525900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6216 -40.5576 5.0 47.3 -137.4 3.5452 2.3 4.2 Vela X-1 304.6916 -62.9439 2.4 49.6 -26.6 5.3768 4.7 ------ UNKNOWN 136.4821 -85.4469 2.9 30.1 -66.8 2.9415 4.0 ------ UNKNOWN 127.5491 -20.9934 5.3 58.8 -159.2 9.0016 2.2 ------ UNKNOWN 129.2292 -37.8788 4.2 46.1 -144.9 3.1078 2.8 ------ UNKNOWN 297.8435 -54.1172 3.7 59.0 -24.4 13.4101 3.1 ------ UNKNOWN 295.0151 -58.0749 4.6 56.3 -28.3 6.8874 2.5 ------ UNKNOWN 135.9688 -30.5569 5.1 55.3 -145.3 10.7021 2.2 ------ UNKNOWN 141.9919 -43.1989 2.7 48.6 -130.3 9.8413 4.2 ------ UNKNOWN