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: Mon Sep 29 23:59:32 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
==========================================================================
BAT Trigger Time: 290934384.0
UTC: 2010-03-22T07:06:18.364 [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst is the T100 start time.
Analysis Position: [ source = GCN ]
RA: 76.489 Dec: 42.685 [deg; J2000]
Refined Position: [ source = BAT pre-slew image ]
RA: 76.489 Dec: 42.685 [deg; J2000]
{ 05h 05m 57.4s , +42d 41' 06.0" }
+/- 2.81292988964 [arcmin] (estimated 90% radius based on SNR)
SNR: 6.94255957363
Angular difference between the analysis and refined position is 0.000000 arcmin
Partial Coding Fraction: 6.250000e-01 [ including projection effects ]
Duration
T90: 1. +/- 1.4142135623731
Measured from: 0
to: 1 [s; relative to TRIGTIME]
T50: 1. +/- 1.
Measured from: 0
to: 1 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 1.000 0.000 1.000
T90 1.000 0.000 1.000
T50 1.000 0.000 1.000
Peak 1.000 0.000 1.000
====== 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 -2.021 -0.469 0.416 - - - 5.02e-03 -1.56e-03 1.49e-03 60.950 57
CPL -1.477 -0.649 2.997 37.042 N/A N/A 1.08e-02 N/A N/A 60.770 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 -2.021 -0.469 0.416 - - - 5.02e-03 -1.56e-03 1.49e-03 60.950 57
CPL -1.477 -0.650 2.997 37.042 N/A N/A 1.08e-02 N/A N/A 60.770 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 1.05e-08 1.40e-08 1.38e-08 2.45e-08 4.64e-08 6.29e-08 erg/cm2
90%_error_low -3.24e-09 -3.35e-09 -5.51e-09 -1.48e-08 -1.30e-08 -2.27e-08 erg/cm2
90%_error_hi 3.36e-09 3.32e-09 5.83e-09 2.53e-08 1.36e-08 3.06e-08 erg/cm2
Peak flux PL 3.42e-01 2.53e-01 1.25e-01 8.75e-02 7.61e-01 8.07e-01 ph/cm2/s
90%_error_low -1.07e-01 -5.95e-02 -4.84e-02 -5.09e-02 -1.77e-01 -1.90e-01 ph/cm2/s
90%_error_hi 1.12e-01 5.93e-02 5.05e-02 8.15e-02 1.77e-01 1.91e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -3.24e-09 -3.35e-09 -5.51e-09 -1.48e-08 -1.30e-08 -2.27e-08 erg/cm2
90%_error_hi 3.36e-09 3.32e-09 5.83e-09 2.53e-08 1.36e-08 3.06e-08 erg/cm2
Peak flux CPL 3.32e-01 2.71e-01 1.20e-01 3.72e-02 7.49e-01 7.61e-01 ph/cm2/s
90%_error_low -1.19e-01 N/A -7.18e-02 -3.72e-02 -1.82e-01 N/A ph/cm2/s
90%_error_hi 1.15e-01 N/A 5.54e-02 9.40e-02 1.83e-01 N/A ph/cm2/s
======================================================================
Image
15.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 76.489 42.685 0.000 36.725 -154.226 0.087 6.943 TRIG_00416771 Image time interval: 0.000 to 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.
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 1.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.02119 ( -0.469111 0.415881 ) Norm@50keV : 5.02316E-03 ( -0.00156132 0.00148895 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.95 using 59 PHA bins. # Reduced chi-squared = 1.069 for 57 degrees of freedom # Null hypothesis probability = 3.358210e-01 Photon flux (15-150 keV) in 1 sec: 0.760968 ( -0.177134 0.177144 ) ph/cm2/s Energy fluence (15-150 keV) : 4.63874e-08 ( -1.29502e-08 1.356e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.47694 ( -0.652528 2.99415 ) Epeak [keV] : 37.0419 ( ) Norm@50keV : 1.08332E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.77 using 59 PHA bins. # Reduced chi-squared = 1.085 for 56 degrees of freedom # Null hypothesis probability = 3.082888e-01 Photon flux (15-150 keV) in 1 sec: 0.749071 ( -0.18247 0.182948 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.02119 ( -0.469111 0.415881 ) Norm@50keV : 5.02316E-03 ( -0.00156132 0.00148895 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.95 using 59 PHA bins. # Reduced chi-squared = 1.069 for 57 degrees of freedom # Null hypothesis probability = 3.358210e-01 Photon flux (15-150 keV) in 1 sec: 0.760968 ( -0.177134 0.177144 ) ph/cm2/s Energy fluence (15-150 keV) : 4.63874e-08 ( -1.29502e-08 1.356e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.47694 ( -0.653454 2.99415 ) Epeak [keV] : 37.0419 ( ) Norm@50keV : 1.08332E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.77 using 59 PHA bins. # Reduced chi-squared = 1.085 for 56 degrees of freedom # Null hypothesis probability = 3.082888e-01 Photon flux (15-150 keV) in 1 sec: 0.749071 ( -0.18247 0.182948 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 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
IMX = -0.671839368756, IMY = 0.324402723
Spacecraft aspect plot
Bright source in the event data image
Event data image of 15-350 keV band
Time interval of the image: -3.000000 7.014500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6012 22.0027 3.5 54.2 -172.1 0.3190 3.3 1.9 Crab 178.6173 40.7032 2.6 40.2 67.8 0.4984 4.5 ------ UNKNOWN 358.0319 73.3869 2.5 32.0 -66.4 0.2149 4.7 ------ UNKNOWN
Webpage updated on: Wed Nov 25 13:54:41 EST 2015