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: Sun Nov 30 03:03:29 EST 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
==========================================================================
BAT Trigger Time: 291082891.2
UTC: 2010-03-24T00:21:25.559 [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: 98.6382395628 Dec: -9.72261050988 [deg; J2000]
{ 06h 34m 33.2s , -9d -43' -21.4" }
+/- 2.74722149803 [arcmin] (estimated 90% radius based on SNR)
SNR: 7.18098850388
Angular difference between the analysis and refined position is Usage: arcmin
Partial Coding Fraction: 1.015625e+00 [ including projection effects ]
Duration
T90: 6.40000003576279 +/- 1.6
Measured from: 0
to: 6.4 [s; relative to TRIGTIME]
T50: 3.19999998807907 +/- 1.6
Measured from: 1.6
to: 4.8 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 6.400 0.000 6.400
T90 6.400 0.000 6.400
T50 3.200 1.600 4.800
Peak 1.000 3.500 4.500
====== 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 -2.280 -0.489 0.411 - - - 1.23e-03 -4.24e-04 4.16e-04 52.320 57
CPL -1.404 -0.678 2.688 23.773 N/A N/A 4.54e-03 N/A N/A 51.780 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 -3.601 -2.164 1.207 - - - 4.93e-04 -4.93e-04 9.31e-04 61.950 57
CPL -0.921 N/A N/A 9.429 N/A N/A 6.23e-02 N/A N/A 61.500 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 2.11e-08 2.42e-08 1.99e-08 2.75e-08 7.52e-08 9.27e-08 erg/cm2
90%_error_low -5.24e-09 -5.89e-09 -8.62e-09 -1.74e-08 -2.05e-08 -3.15e-08 erg/cm2
90%_error_hi 5.31e-09 5.64e-09 9.81e-09 3.16e-08 2.22e-08 4.29e-08 erg/cm2
Peak flux PL 1.60e-01 4.80e-02 7.91e-03 1.50e-03 2.17e-01 2.17e-01 ph/cm2/s
90%_error_low -6.80e-02 -3.66e-02 -7.91e-03 -1.50e-03 -1.01e-01 -1.01e-01 ph/cm2/s
90%_error_hi 6.78e-02 4.29e-02 2.27e-02 1.34e-02 1.05e-01 1.07e-01 ph/cm2/s
Fluence CPL 2.07e-08 2.66e-08 1.67e-08 5.07e-09 6.78e-08 6.90e-08 erg/cm2
90%_error_low -5.69e-09 N/A -1.13e-08 N/A -1.95e-08 N/A erg/cm2
90%_error_hi 5.54e-09 N/A 1.20e-08 N/A 2.70e-08 N/A erg/cm2
Peak flux CPL 1.60e-01 4.66e-02 7.63e-03 1.66e-03 2.16e-01 2.15e-01 ph/cm2/s
90%_error_low -6.89e-02 -4.66e-02 N/A -1.66e-03 -1.00e-01 -9.95e-02 ph/cm2/s
90%_error_hi 6.67e-02 4.72e-02 N/A 1.59e-02 1.06e-01 1.09e-01 ph/cm2/s
======================================================================
Image
15.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 98.638 -9.723 0.027 9.871 153.190 0.201 7.181 TRIG_00416945 Image time interval: -1.200 to 8.847 [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 6.400 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.2803 ( -0.488842 0.410653 ) Norm@50keV : 1.23293E-03 ( -0.000423879 0.00041639 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.32 using 59 PHA bins. # Reduced chi-squared = 0.9179 for 57 degrees of freedom # Null hypothesis probability = 6.510491e-01 Photon flux (15-150 keV) in 6.4 sec: 0.213152 ( -0.044363 0.044436 ) ph/cm2/s Energy fluence (15-150 keV) : 7.51539e-08 ( -2.04964e-08 2.21992e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 6.400 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.4038 ( -0.678264 2.6878 ) Epeak [keV] : 23.7728 ( ) Norm@50keV : 4.53876E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.78 using 59 PHA bins. # Reduced chi-squared = 0.9246 for 56 degrees of freedom # Null hypothesis probability = 6.353852e-01 Photon flux (15-150 keV) in 6.4 sec: 0.208407 ( -0.044134 0.045208 ) ph/cm2/s Energy fluence (15-150 keV) : 6.77798e-08 ( -1.94628e-08 2.69791e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.500 sec. to 4.500 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -3.60073 ( -2.16374 1.20763 ) Norm@50keV : 4.92837E-04 ( -0.000492754 0.000930823 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.95 using 59 PHA bins. # Reduced chi-squared = 1.087 for 57 degrees of freedom # Null hypothesis probability = 3.039133e-01 Photon flux (15-150 keV) in 1 sec: 0.216518 ( -0.10077 0.104988 ) ph/cm2/s Energy fluence (15-150 keV) : 8.26247e-09 ( -4.56189e-09 6.36806e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.500 sec. to 4.500 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.946082 ( ) Epeak [keV] : 14.8632 ( ) Norm@50keV : 1.99712 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.41 using 59 PHA bins. # Reduced chi-squared = 1.097 for 56 degrees of freedom # Null hypothesis probability = 2.882787e-01 Photon flux (15-150 keV) in 1 sec: 0.216091 ( -0.100143 0.105524 ) ph/cm2/s Energy fluence (15-150 keV) : 8.34834e-09 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 6.4 sec. Hardness ratio (energy fluence ratio) = 0.823474022698
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.526622e-08 S(50-150 keV) = 2.9888772e-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 = -0.155302274626, IMY = -0.0784819866007
Spacecraft aspect plot
Bright source in the event data image
Event data image of 15-350 keV band
Time interval of the image: -1.200000 8.846800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6154 21.9977 0.9 25.2 -36.3 0.4086 12.4 1.4 Crab 98.6382 -9.7226 1.6 9.9 153.2 0.2006 7.2 ------ UNKNOWN
Webpage updated on: Sun Jun 21 01:13:02 EDT 2015