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
(This burst occurred during telescope slew)
Process Script Ver: batgrbproduct v2.46
Process Start Time: Fri Jul 7 10:54:57 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/GRB090929A
======================================================================
Trigger: 00075259 Segment: 002
BAT Trigger Time: 275891588.84
UTC: 2009-09-29T04:33:03.714 [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst during slew is the T100 start time.
Analysis Position: [ source = GCN ]
RA: 56.494 Dec: -5.952 [deg; J2000]
Refined Position: [ source = BAT mosaic image ]
RA: 56.5045800673078 Dec: -5.95821119516279 [deg; J2000]
{ 03h 46m 01.1s , -5d -57' -29.6" }
+/- 1.044639506 [arcmin] (estimated 90% radius based on SNR)
SNR: 28.5811878912
Angular difference between the analysis and refined position is 0.733159 arcmin
Partial Coding Fraction: Unavailable because the burst occurred during slew.
Duration
T90: 43.2480000257492 +/- 4.4970247864705
Measured from: 0.224
to: 43.472 [s; relative to TRIGTIME]
T50: 6.86400002241135 +/- 1.28249753375495
Measured from: 1.136
to: 8 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 52.128 0.000 52.128
T90 43.248 0.224 43.472
T50 6.864 1.136 8.000
Peak 1.000 0.772 1.772
====== 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 -1.268 -0.074 0.074 - - - 4.21e-03 -1.54e-04 1.54e-04 68.920 57
CPL -1.273 -0.066 0.084 9999.360 -9999.360 -9999.360 4.23e-03 -1.55e-04 1.53e-04 69.170 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 -0.574 -0.075 0.077 - - - 5.28e-02 -2.32e-03 2.30e-03 62.330 57
CPL -0.567 -0.074 0.079 9999.360 -9999.360 -9999.360 5.32e-02 -2.32e-03 1.17e-02 62.380 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 2.25e-07 4.77e-07 7.93e-07 2.99e-06 2.18e-06 4.49e-06 erg/cm2
90%_error_low -1.78e-08 -2.15e-08 -3.51e-08 -3.10e-07 -8.69e-08 -3.27e-07 erg/cm2
90%_error_hi 1.83e-08 2.13e-08 3.49e-08 3.36e-07 8.71e-08 3.49e-07 erg/cm2
Peak flux PL 6.54e-04 7.46e-03 8.46e-02 7.49e+00 3.91e-01 7.48e+00 ph/cm2/s
90%_error_low -6.23e-05 -1.23e-04 -1.62e-03 -2.83e-01 -1.54e-02 -1.83e-01 ph/cm2/s
90%_error_hi 3.75e-04 4.53e-03 4.26e-02 2.40e+00 1.67e-01 2.56e+00 ph/cm2/s
Fluence CPL 2.25e-07 4.78e-07 7.93e-07 2.98e-06 2.18e-06 4.48e-06 erg/cm2
90%_error_low -1.78e-08 -2.15e-08 -3.50e-08 N/A -8.68e-08 -2.34e-07 erg/cm2
90%_error_hi 1.84e-08 2.13e-08 3.50e-08 N/A 8.71e-08 3.43e-07 erg/cm2
Peak flux CPL 9.12e-01 1.59e+00 2.13e+00 6.11e+00 6.18e+00 1.04e+01 ph/cm2/s
90%_error_low -8.45e-02 -8.66e-02 -8.54e-02 -1.47e+00 -2.72e-01 -1.17e+00 ph/cm2/s
90%_error_hi 4.82e-02 8.49e-02 8.93e-02 -3.60e-04 2.61e-01 5.40e-01 ph/cm2/s
======================================================================
Image
Note1: The mosaic image is made with timebin = 0.2 s; energybin = 15-350 keV
Note2: The mosaic image uses Galactic coordinate.
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 56.505 -5.958 0.002 37.559 75.704 0.036 28.581 UNKNOWN Image time interval: 0.000 to 52.128 [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 52.128 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2676 ( -0.0736326 0.0739903 ) Norm@50keV : 4.20639E-03 ( -0.000153662 0.000153571 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.92 using 59 PHA bins. # Reduced chi-squared = 1.209 for 57 degrees of freedom # Null hypothesis probability = 1.338851e-01 Photon flux (15-150 keV) in 52.13 sec: 0.498966 ( -0.019661 0.019767 ) ph/cm2/s Energy fluence (15-150 keV) : 2.18478e-06 ( -8.68647e-08 8.71134e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 52.128 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.26385 ( -0.066187 0.0835907 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 4.22449E-03 ( -0.00015384 0.000153826 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.13 using 59 PHA bins. # Reduced chi-squared = 1.234 for 56 degrees of freedom # Null hypothesis probability = 1.118002e-01 Photon flux (15-150 keV) in 52.13 sec: 0.498849 ( -0.019706 0.019728 ) ph/cm2/s Energy fluence (15-150 keV) : 2.18373e-06 ( -8.67772e-08 8.7068e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.772 sec. to 1.772 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.573923 ( -0.0752766 0.0767681 ) Norm@50keV : 5.27574E-02 ( -0.00231556 0.00229802 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.33 using 59 PHA bins. # Reduced chi-squared = 1.093 for 57 degrees of freedom # Null hypothesis probability = 2.923955e-01 Photon flux (15-150 keV) in 1 sec: 0.391461 ( -0.015424 0.166929 ) ph/cm2/s Energy fluence (15-150 keV) : 6.83282e-07 ( -3.0001e-08 3.008e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.772 sec. to 1.772 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.566558 ( -0.0745437 0.0788096 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 5.32055E-02 ( -0.00233889 0.0117317 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.38 using 59 PHA bins. # Reduced chi-squared = 1.114 for 56 degrees of freedom # Null hypothesis probability = 2.599567e-01 Photon flux (15-150 keV) in 1 sec: 6.18366 ( -0.27212 0.26147 ) ph/cm2/s Energy fluence (15-150 keV) : 6.84353e-07 ( 0 0 ) 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
Mask shadow pattern unavailable because this burst occurs during telescope slews.Spacecraft aspect plot
