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 27 01:36:30 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
======================================================================
Trigger: 00352671 Segment: 000
BAT Trigger Time: 264476240.0
UTC: 2009-05-20T01:37:15.244 [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: 11.620 Dec: -8.000 [deg; J2000]
Refined Position: [ source = BAT pre-slew image ]
RA: 11.62 Dec: -8.0 [deg; J2000]
{ 00h 46m 28.8s , -8d 00' 00.0" }
+/- 2.88053804396 [arcmin] (estimated 90% radius based on SNR)
SNR: 6.71095487324
Angular difference between the analysis and refined position is 0.000000 arcmin
Partial Coding Fraction: 0.3984375 [ including projection effects ]
Duration
T90: 14.4000000357628 +/- 1.6
Measured from: 0
to: 14.4 [s; relative to TRIGTIME]
T50: 8.00000002980232 +/- 1.6
Measured from: 3.2
to: 11.2 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 14.400 0.000 14.400
T90 14.400 0.000 14.400
T50 8.000 3.200 11.200
Peak 1.000 1.900 2.900
====== 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 -0.701 -0.415 0.502 - - - 2.78e-03 -7.85e-04 7.05e-04 45.250 57
CPL -0.703 -0.407 0.518 9999.350 -9999.350 -9999.350 2.81e-03 -7.38e-04 2.83e-03 45.270 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 -0.027 -1.140 0.027 - - - 2.55e-03 -2.55e-03 2.30e-03 45.460 57
CPL -0.076 -1.087 0.076 9999.360 -9999.360 -9999.360 2.68e-03 -2.68e-03 2.58e-01 45.480 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 1.53e-08 4.61e-08 1.13e-07 7.81e-07 3.07e-07 9.56e-07 erg/cm2
90%_error_low -8.12e-09 -1.69e-08 -2.27e-08 -3.32e-07 -6.21e-08 -3.36e-07 erg/cm2
90%_error_hi 1.04e-08 1.64e-08 2.27e-08 5.35e-07 6.20e-08 5.17e-07 erg/cm2
Peak flux PL 2.61e-02 6.43e-02 1.26e-01 6.14e-01 3.41e-01 8.30e-01 ph/cm2/s
90%_error_low -2.61e-02 -6.43e-02 -1.26e-01 -4.40e-01 -3.41e-01 -4.19e-01 ph/cm2/s
90%_error_hi 9.86e-02 1.01e-01 6.96e-02 1.48e+00 2.16e-01 1.34e+00 ph/cm2/s
Fluence CPL 1.53e-08 4.69e-08 1.10e-07 7.94e-07 3.07e-07 8.67e-07 erg/cm2
90%_error_low N/A -1.80e-08 -3.03e-08 -4.81e-07 -6.19e-08 -3.95e-07 erg/cm2
90%_error_hi N/A 1.57e-08 4.20e-08 1.49e-07 6.17e-08 5.94e-07 erg/cm2
Peak flux CPL 1.04e-02 5.42e-03 5.42e-04 3.70e-04 1.56e-02 1.72e-02 ph/cm2/s
90%_error_low -1.04e-02 -5.42e-03 N/A -3.70e-04 -1.56e-02 N/A ph/cm2/s
90%_error_hi 2.16e-01 1.60e-01 N/A 3.85e-02 5.57e-01 N/A ph/cm2/s
======================================================================
Image
15.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 11.620 -8.000 0.000 44.856 -13.601 0.369 6.711 TRIG_00352671 Image time interval: 0.000 to 9.049 [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 9.049 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.700784 ( -0.414635 0.502285 ) Norm@50keV : 2.78116E-03 ( -0.000785249 0.000705023 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.25 using 59 PHA bins. # Reduced chi-squared = 0.7938 for 57 degrees of freedom # Null hypothesis probability = 8.693945e-01 Photon flux (15-150 keV) in 9.049 sec: 0.321444 ( -0.07717 0.078715 ) ph/cm2/s Energy fluence (15-150 keV) : 3.07122e-07 ( -6.20688e-08 6.20004e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 9.049 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.703255 ( -0.407657 0.518119 ) Epeak [keV] : 9999.35 ( -9999.36 -9999.36 ) Norm@50keV : 2.81374E-03 ( -0.000737411 0.00282773 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.27 using 59 PHA bins. # Reduced chi-squared = 0.8084 for 56 degrees of freedom # Null hypothesis probability = 8.467909e-01 Photon flux (15-150 keV) in 9.049 sec: 0.321454 ( -0.077271 0.078606 ) ph/cm2/s Energy fluence (15-150 keV) : 3.06874e-07 ( -6.19112e-08 6.16623e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.900 sec. to 2.900 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 2.05812 ( -1.14071 0.0265896 ) Norm@50keV : 1.78669E-04 ( -0.000182455 0.00466496 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.14 using 59 PHA bins. # Reduced chi-squared = 0.7920 for 57 degrees of freedom # Null hypothesis probability = 8.717354e-01 Photon flux (15-150 keV) in 1 sec: 0.341067 9.30108E-02 ( ) ph/cm2/s Energy fluence (15-150 keV) : 4.47641e-08 ( -4.2504e-08 1.88305e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.900 sec. to 2.900 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.0764827 ( -1.09027 0.0732005 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 2.68331E-03 ( -0.0026674 0.258476 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.48 using 59 PHA bins. # Reduced chi-squared = 0.8121 for 56 degrees of freedom # Null hypothesis probability = 8.414097e-01 Photon flux (15-150 keV) in 1 sec: 1.55860E-02 ( -0.015586 0.557351 ) ph/cm2/s Energy fluence (15-150 keV) : 4.48415e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 14.4 sec. Hardness ratio (energy fluence ratio) = 2.46110462285
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.134834e-08 S(50-150 keV) = 2.457684e-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 = 0.967075574253, IMY = 0.233986336105
Spacecraft aspect plot
Bright source in the event data image
Event data image of 15-350 keV band
Time interval of the image: 1.472000 9.048800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.6284 35.1333 5.1 42.0 125.4 0.2298 2.3 4.5 Cyg X-1 308.0028 41.0356 4.6 34.9 133.9 -0.1310 -2.5 7.0 Cyg X-3 326.2038 38.3023 41.2 20.7 131.1 0.0088 0.3 1.9 Cyg X-2 8.2420 -19.9699 2.3 54.7 -3.7 0.5661 4.9 ------ UNKNOWN 6.7967 -12.6404 2.1 47.4 -5.1 0.3031 5.5 ------ UNKNOWN 11.6397 -8.0066 1.9 44.9 -13.6 0.3016 6.0 ------ UNKNOWN 25.8966 -2.3978 2.2 48.1 -34.3 0.3589 5.3 ------ UNKNOWN 91.6259 85.2670 2.2 59.0 -157.8 0.8541 5.3 ------ UNKNOWN
Webpage updated on: Wed Nov 25 14:35:38 EST 2015