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: Mon Apr 13 01:29:23 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
======================================================================
Trigger: 00417974 Segment: 000
BAT Trigger Time: 291798457.0
UTC: 2010-04-01T07:07:31.334 [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: 290.813 Dec: -8.257 [deg; J2000]
Refined Position: [ source = BAT pre-slew image ]
RA: 290.813 Dec: -8.257 [deg; J2000]
{ 19h 23m 15.1s , -8d -15' -25.2" }
+/- 2.52809969276 [arcmin] (estimated 90% radius based on SNR)
SNR: 8.08639436996
Angular difference between the analysis and refined position is 0.000000 arcmin
Partial Coding Fraction: 0.07617188 [ including projection effects ]
Duration
T90: 2. +/- 2.23606797749979
Measured from: 0
to: 2 [s; relative to TRIGTIME]
T50: 2. +/- 1.
Measured from: 0
to: 2 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 3.000 0.000 3.000
T90 2.000 0.000 2.000
T50 2.000 0.000 2.000
Peak 1.000 1.000 2.000
====== 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 -1.880 -0.359 0.325 - - - 1.40e-02 -3.22e-03 3.09e-03 50.900 57
CPL -1.213 -1.120 1.902 51.683 N/A N/A 3.31e-02 N/A N/A 50.230 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 -1.857 -0.440 0.394 - - - 1.75e-02 -5.31e-03 5.13e-03 51.050 57
CPL -0.115 -1.830 3.077 46.260 -12.776 -46.260 1.74e-01 -1.74e-01 1.15e+01 48.480 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 7.67e-08 1.12e-07 1.22e-07 2.47e-07 3.86e-07 5.58e-07 erg/cm2
90%_error_low -1.98e-08 -2.07e-08 -3.68e-08 -1.23e-07 -8.52e-08 -1.69e-07 erg/cm2
90%_error_hi 2.07e-08 2.07e-08 3.75e-08 1.81e-07 8.78e-08 2.14e-07 erg/cm2
Peak flux PL 1.01e+00 8.27e-01 4.56e-01 3.70e-01 2.46e+00 2.67e+00 ph/cm2/s
90%_error_low -3.41e-01 -2.11e-01 -1.70e-01 -2.07e-01 -6.28e-01 -6.89e-01 ph/cm2/s
90%_error_hi 3.60e-01 2.11e-01 1.73e-01 3.09e-01 6.28e-01 6.94e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -1.98e-08 -2.07e-08 -3.68e-08 -1.23e-07 -8.52e-08 -1.69e-07 erg/cm2
90%_error_hi 2.07e-08 2.07e-08 3.75e-08 1.81e-07 8.78e-08 2.14e-07 erg/cm2
Peak flux CPL 8.62e-01 1.02e+00 4.68e-01 6.53e-02 2.41e+00 2.42e+00 ph/cm2/s
90%_error_low -3.96e-01 -2.98e-01 N/A -6.53e-02 -6.26e-01 -6.33e-01 ph/cm2/s
90%_error_hi 4.06e-01 3.25e-01 N/A 3.68e-01 6.29e-01 6.48e-01 ph/cm2/s
======================================================================
Image
15.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 290.813 -8.257 0.000 45.165 132.994 0.689 8.086 TRIG_00417974 Image time interval: 0.000 to 3.000 [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 3.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.87978 ( -0.359018 0.325184 ) Norm@50keV : 1.40086E-02 ( -0.00321762 0.0030897 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.90 using 59 PHA bins. # Reduced chi-squared = 0.8929 for 57 degrees of freedom # Null hypothesis probability = 7.020647e-01 Photon flux (15-150 keV) in 3 sec: 1.99347 ( -0.36893 0.36902 ) ph/cm2/s Energy fluence (15-150 keV) : 3.86403e-07 ( -8.52264e-08 8.78076e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 3.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.21334 ( -1.11983 1.90157 ) Epeak [keV] : 51.6830 ( ) Norm@50keV : 3.31498E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.23 using 59 PHA bins. # Reduced chi-squared = 0.8969 for 56 degrees of freedom # Null hypothesis probability = 6.920420e-01 Photon flux (15-150 keV) in 3 sec: 1.94970 ( -0.38067 0.37954 ) 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 1.000 sec. to 2.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.85713 ( -0.440105 0.393422 ) Norm@50keV : 1.74642E-02 ( -0.00531059 0.0051275 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.05 using 59 PHA bins. # Reduced chi-squared = 0.8956 for 57 degrees of freedom # Null hypothesis probability = 6.966788e-01 Photon flux (15-150 keV) in 1 sec: 2.46204 ( -0.62822 0.62836 ) ph/cm2/s Energy fluence (15-150 keV) : 1.60613e-07 ( -4.72399e-08 4.88175e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.000 sec. to 2.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.115069 ( -1.83054 3.07704 ) Epeak [keV] : 46.2603 ( -12.7758 -46.2596 ) Norm@50keV : 0.173521 ( -0.173571 11.4927 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.48 using 59 PHA bins. # Reduced chi-squared = 0.8657 for 56 degrees of freedom # Null hypothesis probability = 7.521948e-01 Photon flux (15-150 keV) in 1 sec: 2.41205 ( -0.62632 0.62871 ) ph/cm2/s Energy fluence (15-150 keV) : 1.45724e-07 ( -4.58529e-08 4.99576e-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 = -0.685866943189, IMY = -0.735659495259
Spacecraft aspect plot
Bright source in the event data image
Event data image of 15-350 keV band
Time interval of the image: 0.566000 8.040000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 290.8127 -8.2790 2.2 45.2 133.0 0.7025 5.3 ------ UNKNOWN 304.3752 17.6707 2.2 53.6 170.2 0.6369 5.3 ------ UNKNOWN
Webpage updated on: Wed Oct 7 01:30:35 EDT 2015