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 Mar 3 23:35:12 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger582760
======================================================================
Trigger: 00582760 Segment: 000
BAT Trigger Time: 410390269.312 [s; MET]
Trigger Stop: 410390269.376 [s; MET]
UTC: 2014-01-02T21:17:37.841180 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 211.90218533779 Dec: 1.3311796378584 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.72
Image Trigger?: NO
Rate S/N Ratio: 30.8382878902185 [ if not an image trigger ]
Image S/N Ratio: 9.72
Analysis Position: [ source = BAT ]
RA: 211.90218533779 Dec: 1.3311796378584 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 211.914563700213 Dec: 1.33207910409454 [deg; J2000]
{ 14h 07m 39.5s , +01d 19' 55.5" }
+/- 0.418806864816995 [arcmin] (estimated 90% radius based on SNR)
+/- 0.105252161894942 [arcmin] (formal 1-sigma fit error)
SNR: 105.462649436279
Angular difference between the analysis and refined position is 0.744460 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 55.0799999237061 +/- 15.4181167886652
Measured from: 0.456000030040741
to: 55.5359999537468 [s; relative to TRIGTIME]
T50: 2.24799996614456 +/- 0.116275557221038
Measured from: 1.17599999904633
to: 3.42399996519089 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.96799999475479
to: 2.96799999475479 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.148000001907349
to: 131.22000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.996134 4.372460 3.547931 0.955761
0.068263 0.071841 0.064336 0.053929 [error]
Peak 0.704925 1.303514 1.365649 0.413499
0.013969 0.018722 0.019786 0.013564 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 131.368 -0.148 131.220
T90 55.080 0.456 55.536
T50 2.248 1.176 3.424
Peak 1.000 1.968 2.968
====== 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 -1.374 -0.042 0.042 - - - 5.97e-03 -1.29e-04 1.28e-04 36.660 57
CPL -1.230 -0.129 0.170 304.156 -132.814 -304.156 6.91e-03 -9.77e-04 1.26e-03 34.410 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 -1.036 -0.034 0.034 - - - 2.58e-01 -4.95e-03 4.94e-03 50.310 57
CPL -0.793 -0.138 0.142 303.282 -88.496 297.504 3.25e-01 -3.94e-02 4.61e-02 41.130 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 8.90e-07 1.77e-06 2.72e-06 9.21e-06 7.62e-06 1.46e-05 erg/cm2
90%_error_low -4.08e-08 -4.68e-08 -6.88e-08 -5.42e-07 -1.71e-07 -5.71e-07 erg/cm2
90%_error_hi 4.15e-08 4.66e-08 6.87e-08 5.65e-07 1.71e-07 5.91e-07 erg/cm2
Peak flux PL 2.96e-03 3.56e-02 4.01e-01 3.60e+01 1.88e+00 3.62e+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 8.56e-07 1.78e-06 2.76e-06 7.63e-06 7.55e-06 1.30e-05 erg/cm2
90%_error_low -5.45e-08 -4.87e-08 -7.92e-08 -1.44e-06 -1.89e-07 -1.44e-06 erg/cm2
90%_error_hi 5.56e-08 4.89e-08 7.97e-08 1.52e-06 1.89e-07 2.59e-06 erg/cm2
Peak flux CPL N/A N/A N/A N/A N/A N/A 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
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 211.9146 1.3321 0.0018 15.4023 -4.5242 11.1562718 105.463 TRIG_00582760 Foreground time interval of the image: -0.148 9.189 (delta_t = 9.337 [sec]) Background time interval of the image: -50.011 -0.148 (delta_t = 49.863 [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 -0.148 sec. to 131.220 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.37422 ( -0.0415434 0.0416163 ) Norm@50keV : 5.96584E-03 ( -0.000128529 0.000128483 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 36.66 using 59 PHA bins. # Reduced chi-squared = 0.6431 for 57 degrees of freedom # Null hypothesis probability = 9.834503e-01 Photon flux (15-150 keV) in 131.4 sec: 0.722403 ( -0.017412 0.017464 ) ph/cm2/s Energy fluence (15-150 keV) : 7.61668e-06 ( -1.71326e-07 1.7131e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.148 sec. to 131.220 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.22975 ( -0.129131 0.170124 ) Epeak [keV] : 304.156 ( -132.814 -304.156 ) Norm@50keV : 6.90632E-03 ( -0.000976659 0.00126157 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 34.41 using 59 PHA bins. # Reduced chi-squared = 0.6145 for 56 degrees of freedom # Null hypothesis probability = 9.897802e-01 Photon flux (15-150 keV) in 131.4 sec: 0.714260 ( -0.019514 0.019599 ) ph/cm2/s Energy fluence (15-150 keV) : 7.54614e-06 ( -1.89236e-07 1.88589e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.968 sec. to 2.968 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.03566 ( -0.034139 0.0342582 ) Norm@50keV : 0.257855 ( -0.00495106 0.00494506 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.31 using 59 PHA bins. # Reduced chi-squared = 0.8827 for 57 degrees of freedom # Null hypothesis probability = 7.222342e-01 Photon flux (15-150 keV) in 1 sec: 1.87684 ( ) ph/cm2/s Energy fluence (15-150 keV) : 2.75417e-06 ( -5.45042e-08 5.456e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.968 sec. to 2.968 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.792531 ( -0.138167 0.142499 ) Epeak [keV] : 303.282 ( -88.4966 297.504 ) Norm@50keV : 0.325426 ( -0.0394224 0.0461311 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 41.13 using 59 PHA bins. # Reduced chi-squared = 0.7344 for 56 degrees of freedom # Null hypothesis probability = 9.317289e-01 Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 2.73067e-06 ( -5.66171e-08 5.6542e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 55.08 sec. Hardness ratio (energy fluence ratio) = 1.54305050921
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.6556211e-06 S(50-150 keV) = 4.960978e-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 = 2.746303727687254E-01, IMY = 2.173074247403469E-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: -50.011400 -0.148000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9872 -15.5755 2.6 41.6 -67.6 1.2870 4.5 3.9 Sco X-1 254.4576 35.3437 19.0 38.5 -152.9 0.0646 0.6 0.1 Her X-1 208.0954 60.4102 2.5 45.1 148.3 0.9547 4.6 ------ UNKNOWN 224.5782 67.8308 3.0 52.3 158.2 1.5421 3.9 ------ UNKNOWN 237.0530 53.4750 2.4 40.7 172.7 0.5723 4.8 ------ UNKNOWN 256.2271 1.3584 2.9 41.0 -98.5 1.3440 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.148000 9.188600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8841 -15.5391 5.0 41.5 -67.6 0.9791 2.3 8.2 Sco X-1 254.2463 35.3167 13.5 38.3 -152.9 0.1414 0.9 10.5 Her X-1 211.9146 1.3321 0.1 15.4 -4.5 11.1564 105.5 ------ UNKNOWN 249.7351 34.9077 2.4 34.7 -154.7 0.6704 4.9 ------ UNKNOWN 265.3639 46.1887 1.9 50.1 -163.1 1.5508 6.2 ------ UNKNOWN 265.6843 28.5107 2.4 46.2 -139.8 1.2238 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 45.788590 962.828000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9648 -15.6585 0.8 36.8 -85.4 25.8801 13.6 1.4 Sco X-1 254.5369 35.3626 6.9 52.2 -159.8 -2.7229 -1.7 4.1 Her X-1 170.6806 -16.0753 4.1 44.3 41.0 5.3926 2.8 ------ UNKNOWN 177.3928 -2.8125 2.7 34.7 59.0 5.0010 4.4 ------ UNKNOWN 214.9370 24.0713 3.0 22.9 163.0 2.1248 3.8 ------ UNKNOWN 234.0476 17.3489 2.2 27.0 -151.8 3.2529 5.2 ------ UNKNOWN 236.3371 8.2757 2.7 25.3 -130.9 2.6990 4.3 ------ UNKNOWN 251.0218 3.6946 3.3 39.2 -118.4 4.4133 3.5 ------ UNKNOWN