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: Sat Jan 11 22:00:48 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger579982
======================================================================
Trigger: 00579982 Segment: 000
BAT Trigger Time: 407689940.672 [s; MET]
Trigger Stop: 407689943.744 [s; MET]
UTC: 2013-12-02T15:12:09.327060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 344.05606070492 Dec: -21.6577101512323 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.35
Image Trigger?: NO
Rate S/N Ratio: 10.8627804912002 [ if not an image trigger ]
Image S/N Ratio: 7.35
Analysis Position: [ source = BAT ]
RA: 344.05606070492 Dec: -21.6577101512323 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 344.013816368876 Dec: -21.640475536918 [deg; J2000]
{ 22h 56m 03.3s , -21d 38' 25.7" }
+/- 2.0182077844339 [arcmin] (estimated 90% radius based on SNR)
+/- 0.971635952001577 [arcmin] (formal 1-sigma fit error)
SNR: 11.1545702117829
Angular difference between the analysis and refined position is 2.572824 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 30.1959999799728 +/- 8.79446555910627
Measured from: -0.416000008583069
to: 29.7799999713898 [s; relative to TRIGTIME]
T50: 12.7639999985695 +/- 5.8401547533584
Measured from: 2.40399998426437
to: 15.1679999828339 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.64399999380112
to: 2.64399999380112 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.27200001478195
to: 35.9840000271797 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.247995 0.326928 0.293924 0.039735
0.043794 0.045232 0.039367 0.033675 [error]
Peak 0.019456 0.030290 0.022160 0.014566
0.007529 0.007572 0.007041 0.005732 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 37.256 -1.272 35.984
T90 30.196 -0.416 29.780
T50 12.764 2.404 15.168
Peak 1.000 1.644 2.644
====== 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 -1.536 -0.249 0.244 - - - 1.72e-03 -2.44e-04 2.42e-04 58.440 57
CPL -1.438 -1.759 1.008 275.673 -275.673 -275.673 1.93e-03 -4.42e-04 3.96e-03 58.450 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 -1.408 -0.500 0.497 - - - 5.49e-03 -1.51e-03 1.50e-03 49.740 57
CPL -1.412 -0.495 0.583 9999.360 -9999.360 -9999.360 5.49e-03 -1.50e-03 2.88e-02 49.740 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 8.49e-08 1.53e-07 2.10e-07 6.03e-07 6.06e-07 1.05e-06 erg/cm2
90%_error_low -1.96e-08 -2.23e-08 -3.89e-08 -2.09e-07 -9.25e-08 -2.44e-07 erg/cm2
90%_error_hi 2.09e-08 2.20e-08 3.83e-08 2.72e-07 9.34e-08 2.94e-07 erg/cm2
Peak flux PL 2.07e-01 2.20e-01 1.66e-01 2.03e-01 6.69e-01 7.95e-01 ph/cm2/s
90%_error_low -9.65e-02 -6.99e-02 -5.60e-02 -1.13e-01 -1.90e-01 -2.19e-01 ph/cm2/s
90%_error_hi 1.12e-01 6.70e-02 5.35e-02 1.72e-01 1.91e-01 2.21e-01 ph/cm2/s
Fluence CPL 8.40e-08 1.54e-07 2.12e-07 5.51e-07 6.04e-07 1.00e-06 erg/cm2
90%_error_low -2.39e-08 -2.31e-08 -3.97e-08 -4.01e-07 -9.95e-08 -4.15e-07 erg/cm2
90%_error_hi 1.75e-08 2.70e-08 4.26e-08 1.09e-07 9.49e-08 5.74e-07 erg/cm2
Peak flux CPL 2.13e-01 2.20e-01 1.64e-01 2.17e-01 6.72e-01 7.98e-01 ph/cm2/s
90%_error_low -1.09e-01 -7.01e-02 -5.46e-02 N/A -1.99e-01 -2.21e-01 ph/cm2/s
90%_error_hi 1.04e-01 3.74e-02 6.29e-02 N/A 1.95e-01 2.14e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 344.0138 -21.6405 0.0172 37.7975 -164.0784 0.9576611 11.155 TRIG_00579982 Foreground time interval of the image: -1.272 35.984 (delta_t = 37.256 [sec]) Background time interval of the image: -345.571 -327.169 (delta_t = 18.403 [sec]) -239.672 -1.272 (delta_t = 238.400 [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 -1.272 sec. to 35.984 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.53588 ( -0.248755 0.244468 ) Norm@50keV : 1.72482E-03 ( -0.000244185 0.000242156 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.44 using 59 PHA bins. # Reduced chi-squared = 1.025 for 57 degrees of freedom # Null hypothesis probability = 4.222430e-01 Photon flux (15-150 keV) in 37.26 sec: 0.217476 ( -0.030764 0.030869 ) ph/cm2/s Energy fluence (15-150 keV) : 6.06336e-07 ( -9.25017e-08 9.34302e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.272 sec. to 35.984 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.43842 ( -1.7432 1.02318 ) Epeak [keV] : 275.673 ( -373.749 -373.749 ) Norm@50keV : 1.92711E-03 ( -0.000362367 0.00404085 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.45 using 59 PHA bins. # Reduced chi-squared = 1.044 for 56 degrees of freedom # Null hypothesis probability = 3.856020e-01 Photon flux (15-150 keV) in 37.26 sec: 0.216923 ( -0.032008 0.031301 ) ph/cm2/s Energy fluence (15-150 keV) : 6.04119e-07 ( -9.95472e-08 9.48744e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.644 sec. to 2.644 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.40758 ( -0.499709 0.496528 ) Norm@50keV : 5.48788E-03 ( -0.00150971 0.00150313 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.74 using 59 PHA bins. # Reduced chi-squared = 0.8726 for 57 degrees of freedom # Null hypothesis probability = 7.415663e-01 Photon flux (15-150 keV) in 1 sec: 0.669493 ( -0.190406 0.191448 ) ph/cm2/s Energy fluence (15-150 keV) : 5.29529e-08 ( -1.57463e-08 1.58996e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.644 sec. to 2.644 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.41212 ( -0.4966 0.580929 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 5.49227E-03 ( -0.00151587 0.0287506 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.74 using 59 PHA bins. # Reduced chi-squared = 0.8882 for 56 degrees of freedom # Null hypothesis probability = 7.093108e-01 Photon flux (15-150 keV) in 1 sec: 0.672076 ( -0.199159 0.194674 ) ph/cm2/s Energy fluence (15-150 keV) : 5.30897e-08 ( -1.64594e-08 1.38463e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 30.196 sec. Hardness ratio (energy fluence ratio) = 1.37949451679
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.3744648e-07 S(50-150 keV) = 3.688971e-07
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 = -7.458566769650892E-01, IMY = 2.127670626912365E-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: -345.571410 -327.168500 -239.672000 -1.272000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.6404 35.0506 4.9 43.4 -38.9 0.8337 2.3 9.4 Cyg X-1 308.1190 40.9693 1.6 39.3 -26.8 1.9615 7.1 1.1 Cyg X-3 325.9991 38.2952 6.1 26.9 -14.5 0.3889 1.9 8.3 Cyg X-2 315.4964 -22.7049 2.3 47.5 -127.3 4.5213 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.272000 35.984000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5566 34.9813 0.0 43.4 -39.0 -0.2077 -1.6 13.3 Cyg X-1 307.9218 40.9644 4.5 39.4 -27.0 0.2494 2.6 8.6 Cyg X-3 326.3482 38.2314 21.2 26.7 -14.2 -0.0359 -0.5 9.9 Cyg X-2 1.2717 25.9220 2.2 19.3 73.3 0.3837 5.1 ------ UNKNOWN 344.0138 -21.6405 1.0 37.8 -164.1 0.9577 11.2 ------ UNKNOWN 322.6214 30.3562 2.2 23.8 -32.8 0.3573 5.2 ------ UNKNOWN 320.0967 1.5475 2.6 27.3 -103.3 0.3922 4.4 ------ UNKNOWN 339.1969 -42.8324 2.6 59.1 -159.6 1.6915 4.4 ------ UNKNOWN 329.0835 -33.8111 2.6 51.8 -148.0 0.9120 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 97.828590 962.395000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 5.6147 -0.5285 2.9 29.8 70.2 3.2817 3.9 338.4 UNKNOWN 321.4052 29.1264 3.4 55.3 -1.7 6.3725 3.4 ------ UNKNOWN 333.1227 -1.5069 2.9 22.8 -6.8 2.0934 4.0 ------ UNKNOWN 328.6049 9.8221 4.2 34.9 -4.8 1.8058 2.7 ------ UNKNOWN 351.4565 -42.9841 3.2 22.2 -171.9 1.8801 3.6 ------ UNKNOWN 22.0107 -77.8867 3.2 59.0 -166.1 12.8854 3.6 ------ UNKNOWN 299.3489 -24.9298 2.6 41.0 -81.1 10.8869 4.4 ------ UNKNOWN 299.6429 -36.0719 4.7 41.1 -98.1 7.5405 2.5 ------ UNKNOWN 300.8035 -55.4357 3.1 46.6 -125.1 9.1728 3.7 ------ UNKNOWN