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 Ver: batgrbproduct v2.46
Process Start Time: Sun Apr 26 23:04:43 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
======================================================================
Trigger: 00420547 Segment: 000
BAT Trigger Time: 294049920.0
UTC: 2010-04-27T08:31:54.255 [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: 89.162894456 Dec: -3.46091788319 [deg; J2000]
{ 05h 56m 39.1s , -3d -27' -39.3" }
+/- 2.45747440064 [arcmin] (estimated 90% radius based on SNR)
SNR: 8.42042022124
Angular difference between the analysis and refined position is Usage: arcmin
Partial Coding Fraction: 0.5703125 [ including projection effects ]
Duration
T90: 24. +/- 1.6
Measured from: 0
to: 24 [s; relative to TRIGTIME]
T50: 12.8000000715256 +/- 1.6
Measured from: 6.4
to: 19.2 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 24.000 0.000 24.000
T90 24.000 0.000 24.000
T50 12.800 6.400 19.200
Peak 1.000 14.700 15.700
====== 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 -1.710 -0.280 0.266 - - - 3.35e-03 -5.79e-04 5.65e-04 55.820 57
CPL -1.002 -0.917 1.431 65.465 -21.052 -65.465 8.02e-03 -5.10e-03 3.79e-02 54.680 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 N/A N/A N/A - - - N/A N/A N/A N/A N/A
CPL N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
=== 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 4.20e-08 6.79e-08 8.30e-08 2.00e-07 2.50e-07 3.92e-07 erg/cm2
90%_error_low -9.62e-09 -1.04e-08 -1.90e-08 -7.99e-08 -4.45e-08 -1.01e-07 erg/cm2
90%_error_hi 1.01e-08 1.04e-08 1.91e-08 1.09e-07 4.54e-08 1.24e-07 erg/cm2
Peak flux PL N/A N/A N/A N/A N/A N/A ph/cm2/s
Image
15.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 89.163 -3.461 0.023 35.656 11.626 0.334 8.420 TRIG_00420547 Image time interval: 0.745 to 8.064 [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 8.064 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.71014 ( -0.280017 0.266366 ) Norm@50keV : 3.34684E-03 ( -0.000578552 0.00056515 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.82 using 59 PHA bins. # Reduced chi-squared = 0.9793 for 57 degrees of freedom # Null hypothesis probability = 5.193794e-01 Photon flux (15-150 keV) in 8.064 sec: 0.446102 ( -0.068809 0.068867 ) ph/cm2/s Energy fluence (15-150 keV) : 2.4973e-07 ( -4.44907e-08 4.54185e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.064 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.00232 ( -0.916782 1.43148 ) Epeak [keV] : 65.4650 ( -21.0514 -65.4648 ) Norm@50keV : 8.01553E-03 ( -0.00510334 0.0378933 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.68 using 59 PHA bins. # Reduced chi-squared = 0.9764 for 56 degrees of freedom # Null hypothesis probability = 5.250417e-01 Photon flux (15-150 keV) in 8.064 sec: 0.433826 ( -0.072011 0.071644 ) ph/cm2/s Energy fluence (15-150 keV) : 2.35766e-07 ( -4.79635e-08 5.02835e-08 ) ergs/cm2
1-s peak spectrum fit
1-s peak spectrum unavailable, likely because there are no event data in the 1-s peak range.
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 24.0 sec. Hardness ratio (energy fluence ratio) = 1.22255952722
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.0987397e-07 S(50-150 keV) = 1.3985592e-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 = 0.702678518699, IMY = -0.144571414049
Spacecraft aspect plot
Bright source in the event data image
Event data image of 15-350 keV band
Time interval of the image: 0.745000 8.064500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.5758 22.0905 6.9 53.2 -16.6 0.1341 1.7 5.6 Crab 67.8562 -73.3084 2.8 47.2 133.7 0.5468 4.1 ------ UNKNOWN 31.0468 -65.5488 2.5 43.5 153.7 0.2828 4.7 ------ UNKNOWN 89.1628 -3.4609 1.4 35.7 11.6 0.3343 8.4 ------ UNKNOWN 41.9025 -37.4824 2.6 19.3 -173.5 0.1215 4.4 ------ UNKNOWN 28.9253 -40.5425 2.2 29.8 -170.2 0.1556 5.1 ------ UNKNOWN 76.0256 24.1217 2.3 52.5 -25.6 0.4182 5.1 ------ UNKNOWN
Webpage updated on: Mon Apr 27 00:29:31 EDT 2015