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 Oct 4 22:50:30 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger599188
======================================================================
Trigger: 00599188 Segment: 000
BAT Trigger Time: 421965066.816 [s; MET]
Trigger Stop: 421965066.944 [s; MET]
UTC: 2014-05-16T20:30:54.797080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.98837333485 Dec: 39.9147098873568 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.73
Image Trigger?: NO
Rate S/N Ratio: 13.4164078649987 [ if not an image trigger ]
Image S/N Ratio: 6.73
Analysis Position: [ source = BAT ]
RA: 252.98837333485 Dec: 39.9147098873568 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 252.975583345581 Dec: 39.960990449251 [deg; J2000]
{ 16h 51m 54.1s , +39d 57' 39.6" }
+/- 2.57672214886108 [arcmin] (estimated 90% radius based on SNR)
+/- 1.07774219289018 [arcmin] (formal 1-sigma fit error)
SNR: 7.86826475610618
Angular difference between the analysis and refined position is 2.838488 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 0.25600004196167 +/- 0.143108320705261
Measured from: -0.0239999890327454
to: 0.232000052928925 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/- 0.0905096828275688
Measured from: 0.0400000214576721
to: 0.10400003194809 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.331999957561493
to: 0.668000042438507 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0239999890327454
to: 0.296000003814697 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.019503 0.024949 0.013815 -0.000407
0.003840 0.004104 0.003534 0.002617 [error]
Peak 0.014998 0.029519 0.011911 -0.006895
0.006155 0.006406 0.005659 0.004406 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.320 -0.024 0.296
T90 0.256 -0.024 0.232
T50 0.064 0.040 0.104
Peak 1.000 -0.332 0.668
====== 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 -1.891 -0.341 0.307 - - - 1.02e-02 -2.47e-03 2.41e-03 66.510 57
CPL 0.489 -1.680 2.746 44.568 -8.920 16.054 2.31e-01 -2.31e-01 9.10e+00 59.780 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 -1.815 -0.562 0.483 - - - 3.61e-03 -1.32e-03 1.26e-03 67.410 57
CPL 0.260 N/A N/A 48.054 N/A N/A 4.99e-02 N/A N/A 65.420 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 6.05e-09 8.76e-09 9.45e-09 1.90e-08 3.01e-08 4.33e-08 erg/cm2
90%_error_low -1.55e-09 -1.76e-09 -2.90e-09 -9.27e-09 -7.02e-09 -1.33e-08 erg/cm2
90%_error_hi 1.61e-09 1.75e-09 2.99e-09 1.33e-08 7.23e-09 1.64e-08 erg/cm2
Peak flux PL 2.01e-01 1.68e-01 9.56e-02 8.06e-02 5.01e-01 5.46e-01 ph/cm2/s
90%_error_low -7.98e-02 -5.02e-02 -4.29e-02 -5.25e-02 -1.49e-01 -1.66e-01 ph/cm2/s
90%_error_hi 8.63e-02 5.02e-02 4.40e-02 8.74e-02 1.49e-01 1.69e-01 ph/cm2/s
Fluence CPL 4.88e-09 1.16e-08 9.04e-09 1.44e-09 2.68e-08 2.70e-08 erg/cm2
90%_error_low -1.84e-09 -2.63e-09 -4.08e-09 -1.34e-09 -6.29e-09 -6.43e-09 erg/cm2
90%_error_hi 1.86e-09 2.86e-09 3.92e-09 6.44e-09 7.15e-09 8.73e-09 erg/cm2
Peak flux CPL 1.54e-01 2.10e-01 1.00e-01 1.19e-02 4.74e-01 4.76e-01 ph/cm2/s
90%_error_low -1.54e-01 -7.05e-02 -5.39e-02 -1.19e-02 -1.56e-01 -1.57e-01 ph/cm2/s
90%_error_hi 1.05e-01 7.73e-02 5.46e-02 9.57e-02 1.53e-01 1.62e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 252.9756 39.9610 0.0244 22.6469 40.6295 0.0572317 7.868 TRIG_00599188 Foreground time interval of the image: -0.024 0.296 (delta_t = 0.320 [sec]) Background time interval of the image: -315.915 -300.722 (delta_t = 15.193 [sec]) -239.816 -0.024 (delta_t = 239.792 [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 -0.024 sec. to 0.296 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.89057 ( -0.340045 0.30734 ) Norm@50keV : 1.02394E-02 ( -0.00247323 0.00241023 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.51 using 59 PHA bins. # Reduced chi-squared = 1.167 for 57 degrees of freedom # Null hypothesis probability = 1.822481e-01 Photon flux (15-150 keV) in 0.32 sec: 1.46372 ( -0.2918 0.2918 ) ph/cm2/s Energy fluence (15-150 keV) : 3.01217e-08 ( -7.02131e-09 7.23251e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.296 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.488963 ( -1.68099 2.74508 ) Epeak [keV] : 44.5679 ( -8.91917 16.0558 ) Norm@50keV : 0.230707 ( -0.231081 9.09999 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.78 using 59 PHA bins. # Reduced chi-squared = 1.068 for 56 degrees of freedom # Null hypothesis probability = 3.400246e-01 Photon flux (15-150 keV) in 0.32 sec: 1.41223 ( -0.28997 0.29155 ) ph/cm2/s Energy fluence (15-150 keV) : 2.6809e-08 ( -6.2945e-09 7.152e-09 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.332 sec. to 0.668 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.81491 ( -0.561778 0.482947 ) Norm@50keV : 3.61151E-03 ( -0.00132002 0.00125856 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.41 using 59 PHA bins. # Reduced chi-squared = 1.183 for 57 degrees of freedom # Null hypothesis probability = 1.627446e-01 Photon flux (15-150 keV) in 1 sec: 0.500589 ( -0.149475 0.14948 ) ph/cm2/s Energy fluence (15-150 keV) : 3.32392e-08 ( -1.1696e-08 1.23183e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.332 sec. to 0.668 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.259868 ( ) Epeak [keV] : 48.0544 ( ) Norm@50keV : 4.98508E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.42 using 59 PHA bins. # Reduced chi-squared = 1.168 for 56 degrees of freedom # Null hypothesis probability = 1.822262e-01 Photon flux (15-150 keV) in 1 sec: 0.474376 ( -0.155996 0.153354 ) ph/cm2/s Energy fluence (15-150 keV) : 2.94517e-08 ( -1.02071e-08 1.26549e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.256 sec. Hardness ratio (energy fluence ratio) = 1.0785494289
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.4806967e-08 S(50-150 keV) = 1.5315843e-08
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 = 3.166435238837305E-01, IMY = -2.716794441283923E-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: -315.915400 -300.722100 -239.816000 -0.024000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4156 35.4933 13.0 27.0 44.3 0.2238 0.9 9.3 Her X-1 299.5405 35.1397 11.0 51.0 -2.2 -0.4768 -1.0 4.4 Cyg X-1 308.1004 40.7658 11.7 51.5 -13.5 0.4930 1.0 11.2 Cyg X-3 187.3352 18.4573 3.0 49.0 151.4 3.1659 3.9 ------ UNKNOWN 157.9231 25.8009 2.6 58.4 -175.4 5.6920 4.4 ------ UNKNOWN 193.1117 76.1255 2.0 23.7 -105.8 1.2960 5.7 ------ UNKNOWN 323.9738 43.3958 3.6 57.6 -26.3 3.9030 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.024000 0.296000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5399 35.2814 5.4 27.2 44.3 0.0183 2.1 5.4 Her X-1 299.6265 35.1397 4.1 51.0 -2.3 -0.0442 -2.8 4.1 Cyg X-1 307.9342 41.0150 26.2 51.2 -13.6 -0.0064 -0.4 8.8 Cyg X-3 201.3914 32.4282 2.4 30.5 145.0 0.0407 4.8 ------ UNKNOWN 252.9753 39.9625 1.5 22.6 40.6 0.0566 7.8 ------ UNKNOWN 291.9644 51.6983 2.1 36.0 -15.4 0.0431 5.6 ------ UNKNOWN 128.6122 63.4394 2.0 45.6 -123.3 0.1498 5.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 63.084600 962.277200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4557 35.3442 33.3 4.7 54.7 0.1897 0.3 0.1 Her X-1 268.4179 -1.6061 0.0 43.9 46.8 0.4092 0.2 9.7 SW J1753.5-0127 288.8032 10.9367 1.3 42.9 11.8 8.2479 9.0 0.6 GRS 1915+105 299.5882 35.1957 0.3 36.8 -28.5 29.9685 38.0 0.4 Cyg X-1 308.0853 40.9685 2.5 41.2 -40.7 4.7256 4.5 1.5 Cyg X-3 296.4533 0.6373 3.4 55.7 12.9 13.0637 3.4 ------ UNKNOWN 274.2783 12.7944 2.5 33.0 28.7 3.4745 4.5 ------ UNKNOWN 290.0202 23.7545 4.6 35.0 -4.5 1.7898 2.5 ------ UNKNOWN 251.6327 53.5484 2.3 13.7 -114.1 2.8699 5.1 ------ UNKNOWN 163.3687 62.2552 9.7 55.2 -145.2 5.5924 1.2 ------ UNKNOWN