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 GROUND-DETECTED GRB DATA PROCESSING REPORT
Process Script: hand-made scripts that follow steps in batgrbproduct
but without using TDRSS info
Process Start Time: Tue Oct 21 17:36:58 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
==========================================================================
BAT Trigger Time: 418090218.688
UTC: 2014-04-02T00:10:06.854 UTC [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst is the T100 start time.
Refined Position: [ source = BAT pre-slew image ]
RA: 207.628967902 Dec: 5.99494369564 [deg; J2000]
{ 13h 50m 31.0s , +05d 59' 41.8" }
+/- 2.73370758821 [arcmin] (estimated 90% radius based on SNR)
SNR: 7.23175468863
Angular difference between the analysis and refined position is Usage: arcmin
Partial Coding Fraction: 6.640625e-01 [ including projection effects ]
Duration (found by FRED-model fit)
T90: 0.896 +/- N/A
Measured from: 0.032
to: 0.928 [s; relative to TRIGTIME]
T50: 0.32 +/- N/A
Measured from: 0.112
to: 0.432
====== Table of the duration information =============================
Value tstart tstop
T100 1.408 0.000 1.408
T90 0.896 0.032 0.928
T50 0.320 0.112 0.432
Peak 1.000 -0.448 0.552
====== 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 -1.147 -0.562 0.605 - - - 3.76e-03 -1.04e-03 1.04e-03 45.450 57
CPL -1.168 -0.542 0.890 9999.360 -9999.360 -9999.360 3.77e-03 -1.05e-03 4.21e-03 45.470 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 -0.943 -0.568 0.644 - - - 4.13e-03 -1.32e-03 1.27e-03 66.340 57
CPL -0.874 N/A N/A 948.131 N/A N/A 4.43e-03 N/A N/A 66.380 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 4.86e-09 1.11e-08 2.00e-08 8.57e-08 5.45e-08 1.22e-07 erg/cm2
90%_error_low -2.60e-09 -3.90e-09 -7.08e-09 -5.29e-08 -1.72e-08 -5.89e-08 erg/cm2
90%_error_hi 3.08e-09 3.58e-09 6.71e-09 1.00e-07 1.76e-08 1.00e-07 erg/cm2
Peak flux PL 9.99e-02 1.40e-01 1.46e-01 2.79e-01 4.74e-01 6.65e-01 ph/cm2/s
90%_error_low -5.94e-02 -5.90e-02 -4.84e-02 -1.61e-01 -1.49e-01 -2.15e-01 ph/cm2/s
90%_error_hi 7.62e-02 5.56e-02 4.68e-02 2.80e-01 1.50e-01 2.50e-01 ph/cm2/s
Fluence CPL 4.86e-09 1.11e-08 1.92e-08 8.82e-08 5.42e-08 1.17e-07 erg/cm2
90%_error_low N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_hi N/A N/A N/A N/A N/A N/A erg/cm2
Peak flux CPL 1.06e-01 1.40e-01 1.45e-01 3.01e-01 4.77e-01 6.83e-01 ph/cm2/s
90%_error_low -7.33e-02 -6.06e-02 -4.76e-02 N/A -1.59e-01 -6.83e-01 ph/cm2/s
90%_error_hi 6.10e-02 5.98e-02 5.79e-02 N/A 1.53e-01 2.34e-01 ph/cm2/s
======================================================================
Image
15.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 207.629 5.995 0.027 20.235 83.823 0.100 7.232 TRIG_00594308 Image time interval: 0.000 to 1.408 [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.
Best duration plot
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 0.000 sec. to 1.408 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.1472 ( -0.562439 0.604869 ) Norm@50keV : 3.75591E-03 ( -0.00104439 0.00104361 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.45 using 59 PHA bins. # Reduced chi-squared = 0.7974 for 57 degrees of freedom # Null hypothesis probability = 8.645096e-01 Photon flux (15-150 keV) in 1.408 sec: 0.437867 ( -0.125752 0.12612 ) ph/cm2/s Energy fluence (15-150 keV) : 5.44933e-08 ( -1.72032e-08 1.75582e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.408 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.16791 ( -0.543278 0.888278 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 3.77383E-03 ( -0.00104836 0.00420616 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.47 using 59 PHA bins. # Reduced chi-squared = 0.8119 for 56 degrees of freedom # Null hypothesis probability = 8.416576e-01 Photon flux (15-150 keV) in 1.408 sec: 0.437852 ( -0.125832 0.126034 ) ph/cm2/s Energy fluence (15-150 keV) : 5.41642e-08 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.448 sec. to 0.552 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.943043 ( -0.568061 0.643718 ) Norm@50keV : 4.12621E-03 ( -0.00132101 0.0012727 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.34 using 59 PHA bins. # Reduced chi-squared = 1.164 for 57 degrees of freedom # Null hypothesis probability = 1.859108e-01 Photon flux (15-150 keV) in 1 sec: 0.473961 ( -0.148577 0.149821 ) ph/cm2/s Energy fluence (15-150 keV) : 4.55586e-08 ( -1.4886e-08 1.51304e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.448 sec. to 0.552 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.874282 ( ) Epeak [keV] : 948.131 ( ) Norm@50keV : 4.43180E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.38 using 59 PHA bins. # Reduced chi-squared = 1.185 for 56 degrees of freedom # Null hypothesis probability = 1.615561e-01 Photon flux (15-150 keV) in 1 sec: 0.477069 ( -0.159233 0.152603 ) ph/cm2/s Energy fluence (15-150 keV) : 4.57362e-08 ( -1.57667e-08 1.18051e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = 0.0396634401072, IMY = -0.366480533403
Spacecraft aspect plot
Bright source in the event data image
Event data image of 15-350 keV band
Time interval of the image: 0.000000 1.408000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8899 -15.6661 4.6 50.4 24.5 0.1164 2.5 5.4 Sco X-1 254.4289 35.5170 5.2 35.7 -52.9 0.0424 2.2 10.6 Her X-1 268.2844 -1.4824 5.1 58.4 -7.6 -0.1527 -2.2 5.3 SW J1753.5-0127 165.0180 18.0879 2.2 46.3 155.2 0.1689 5.2 ------ UNKNOWN 207.6291 5.9948 1.6 20.2 83.8 0.0999 7.2 ------ UNKNOWN 151.2544 37.3098 2.0 54.5 -177.2 0.2170 5.8 ------ UNKNOWN 254.2561 23.8573 2.6 36.1 -32.9 0.0672 4.5 ------ UNKNOWN 191.8766 63.1623 2.5 40.9 -131.8 0.0992 4.5 ------ UNKNOWN 275.3492 13.3664 3.5 58.2 -26.9 0.2306 3.3 ------ UNKNOWN
Webpage updated on: Sun Jun 21 01:04:44 EDT 2015