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 21:17:05 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger605700
======================================================================
Trigger: 00605700 Segment: 000
BAT Trigger Time: 427495787.968 [s; MET]
Trigger Stop: 427495796.16 [s; MET]
UTC: 2014-07-19T20:49:35.681860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 39.7382664338233 Dec: -2.37796842981903 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.91
Image Trigger?: NO
Rate S/N Ratio: 10.0995049383621 [ if not an image trigger ]
Image S/N Ratio: 10.91
Analysis Position: [ source = BAT ]
RA: 39.7382664338233 Dec: -2.37796842981903 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 39.7327341117314 Dec: -2.38409188504985 [deg; J2000]
{ 02h 38m 55.9s , -02d 23' 02.7" }
+/- 1.64689807134861 [arcmin] (estimated 90% radius based on SNR)
+/- 0.816100867662486 [arcmin] (formal 1-sigma fit error)
SNR: 14.9140121619311
Angular difference between the analysis and refined position is 0.494956 arcmin
Partial Coding Fraction: 0.4257812 [ including projection effects ]
Duration
T90: 54 +/- 12.5399362039845
Measured from: -12.9679999947548
to: 41.0320000052452 [s; relative to TRIGTIME]
T50: 17 +/- 7.28010988928052
Measured from: -2.96799999475479
to: 14.0320000052452 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.03200000524521
to: 2.03200000524521 [s; relative to TRIGTIME]
Total Fluence
Measured from: -16.9679999947548
to: 48.0320000052452 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.590335 0.774555 0.526126 0.061294
0.068875 0.071453 0.062139 0.051929 [error]
Peak 0.016579 0.038697 0.023533 0.006077
0.008754 0.009125 0.008126 0.006595 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 65.000 -16.968 48.032
T90 54.000 -12.968 41.032
T50 17.000 -2.968 14.032
Peak 1.000 1.032 2.032
====== 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 -1.722 -0.177 0.172 - - - 2.13e-03 -2.34e-04 2.32e-04 65.130 57
CPL -1.026 -0.705 0.849 66.518 -16.535 846.671 4.96e-03 -2.81e-03 8.75e-03 62.290 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 -1.318 -0.501 0.552 - - - 6.27e-03 -1.85e-03 1.84e-03 47.910 57
CPL -1.322 -0.496 0.563 9999.360 -9999.360 -9999.360 6.29e-03 -1.83e-03 6.39e-02 47.910 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 2.18e-07 3.49e-07 4.23e-07 1.01e-06 1.28e-06 2.00e-06 erg/cm2
90%_error_low -3.46e-08 -3.66e-08 -6.07e-08 -2.67e-07 -1.45e-07 -3.29e-07 erg/cm2
90%_error_hi 3.59e-08 3.65e-08 6.06e-08 3.23e-07 1.47e-07 3.71e-07 erg/cm2
Peak flux PL 2.17e-01 2.43e-01 1.95e-01 2.60e-01 7.50e-01 9.14e-01 ph/cm2/s
90%_error_low -1.14e-01 -8.98e-02 -6.43e-02 -1.42e-01 -2.36e-01 -2.68e-01 ph/cm2/s
90%_error_hi 1.35e-01 8.52e-02 6.25e-02 2.25e-01 2.39e-01 2.69e-01 ph/cm2/s
Fluence CPL 1.98e-07 3.78e-07 4.37e-07 3.86e-07 1.22e-06 1.40e-06 erg/cm2
90%_error_low -4.06e-08 -4.69e-08 -6.76e-08 -2.30e-07 -1.57e-07 -2.81e-07 erg/cm2
90%_error_hi 4.12e-08 4.88e-08 6.80e-08 6.35e-07 1.59e-07 6.32e-07 erg/cm2
Peak flux CPL 2.18e-01 2.42e-01 1.94e-01 2.61e-01 7.51e-01 9.25e-01 ph/cm2/s
90%_error_low -1.26e-01 -4.68e-02 -6.36e-02 N/A -2.39e-01 -2.82e-01 ph/cm2/s
90%_error_hi 1.12e-01 7.92e-02 7.47e-02 N/A 2.38e-01 2.54e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 39.7327 -2.3841 0.0128 43.6736 -31.5667 2.2428243 14.914 TRIG_00605700 Foreground time interval of the image: -16.968 48.032 (delta_t = 65.000 [sec]) Background time interval of the image: -522.867 -506.088 (delta_t = 16.779 [sec]) -239.968 -19.510 (delta_t = 220.458 [sec]) -17.968 -16.968 (delta_t = 1.000 [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 -16.968 sec. to 48.032 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.72243 ( -0.176664 0.172441 ) Norm@50keV : 2.12798E-03 ( -0.000234282 0.000231923 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.13 using 59 PHA bins. # Reduced chi-squared = 1.143 for 57 degrees of freedom # Null hypothesis probability = 2.149247e-01 Photon flux (15-150 keV) in 65 sec: 0.284882 ( -0.030017 0.030068 ) ph/cm2/s Energy fluence (15-150 keV) : 1.27875e-06 ( -1.45371e-07 1.46513e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -16.968 sec. to 48.032 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.02636 ( -0.70489 0.848624 ) Epeak [keV] : 66.5181 ( -16.5349 846.671 ) Norm@50keV : 4.96086E-03 ( -0.00280917 0.00874956 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.29 using 59 PHA bins. # Reduced chi-squared = 1.112 for 56 degrees of freedom # Null hypothesis probability = 2.624267e-01 Photon flux (15-150 keV) in 65 sec: 0.277758 ( -0.030995 0.030973 ) ph/cm2/s Energy fluence (15-150 keV) : 1.21961e-06 ( -1.57398e-07 1.58779e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.032 sec. to 2.032 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.31771 ( -0.501334 0.552116 ) Norm@50keV : 6.26546E-03 ( -0.00184553 0.00183832 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.91 using 59 PHA bins. # Reduced chi-squared = 0.8405 for 57 degrees of freedom # Null hypothesis probability = 7.991073e-01 Photon flux (15-150 keV) in 1 sec: 0.749987 ( -0.236308 0.238766 ) ph/cm2/s Energy fluence (15-150 keV) : 6.16581e-08 ( -1.88131e-08 1.89484e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.032 sec. to 2.032 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.32192 ( -0.49908 0.560655 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 6.28503E-03 ( -0.00183398 0.0638813 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.91 using 59 PHA bins. # Reduced chi-squared = 0.8555 for 56 degrees of freedom # Null hypothesis probability = 7.706874e-01 Photon flux (15-150 keV) in 1 sec: 0.751025 ( -0.238544 0.238207 ) ph/cm2/s Energy fluence (15-150 keV) : 6.17703e-08 ( -1.98147e-08 1.72757e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 54.0 sec. Hardness ratio (energy fluence ratio) = 1.21218792589
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.670466e-07 S(50-150 keV) = 7.116902e-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 = 8.134667019381689E-01, IMY = 4.997974591022476E-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: -522.867410 -506.088000 -239.968000 -19.510400 -17.968000 -16.968000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.2024 40.8785 3.9 49.5 158.8 1.9951 2.9 6.1 Cyg X-3 326.3353 38.3719 6.7 35.4 160.4 -0.4887 -1.7 8.3 Cyg X-2 43.9060 -20.4034 2.6 58.0 -16.3 3.6099 4.4 ------ UNKNOWN 31.1444 19.8659 2.5 27.7 -62.8 1.0014 4.7 ------ UNKNOWN 49.8450 -14.4650 3.5 58.7 -25.9 3.8793 3.3 ------ UNKNOWN 51.1256 -1.4871 3.1 53.1 -40.2 3.4561 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -16.968000 48.032000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 307.9765 41.0857 13.5 49.7 159.1 0.2689 0.9 10.0 Cyg X-3 326.2419 38.1639 8.5 35.4 160.0 -0.1786 -1.4 10.0 Cyg X-2 0.8037 13.1799 2.1 7.0 38.1 0.4595 5.5 ------ UNKNOWN 30.9345 -20.1146 3.2 49.5 -5.5 0.6848 3.6 ------ UNKNOWN 39.7327 -2.3841 0.8 43.7 -31.6 2.2427 14.9 ------ UNKNOWN 314.1468 74.1174 2.5 59.6 -161.8 2.5595 4.6 ------ UNKNOWN 43.7046 41.4766 2.1 41.4 -98.8 1.9319 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 563.432600 962.042000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6286 22.0194 0.3 36.9 -63.2 16.6885 34.8 0.4 Crab 357.1489 30.4585 2.6 39.9 103.8 4.9087 4.5 ------ UNKNOWN 24.3957 1.5898 3.3 41.8 43.0 2.5410 3.4 ------ UNKNOWN 264.1226 80.9249 4.8 58.3 -175.7 5.6594 2.4 ------ UNKNOWN 58.1350 13.0207 2.5 28.3 -16.6 1.2091 4.7 ------ UNKNOWN 135.2582 69.5042 3.1 54.0 -143.4 5.7668 3.8 ------ UNKNOWN 105.2178 49.2246 2.4 43.2 -113.2 5.0913 4.8 ------ UNKNOWN