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 GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Sat Mar 14 16:18:04 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger633180
======================================================================
Trigger: 00633180 Segment: 000
BAT Trigger Time: 446931497.28 [s; MET]
Trigger Stop: 446931497.792 [s; MET]
UTC: 2015-03-01T19:38:04.027580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 89.157317619222 Dec: -57.9771814195121 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.73
Image Trigger?: NO
Rate S/N Ratio: 17.8885438199983 [ if not an image trigger ]
Image S/N Ratio: 10.73
Analysis Position: [ source = BAT ]
RA: 89.157317619222 Dec: -57.9771814195121 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 89.1596804556417 Dec: -57.9672142320293 [deg; J2000]
{ 05h 56m 38.3s , -57d 58' 02.0" }
+/- 0.759113042586336 [arcmin] (estimated 90% radius based on SNR)
+/- 0.176544936136965 [arcmin] (formal 1-sigma fit error)
SNR: 45.0930032738172
Angular difference between the analysis and refined position is 0.602739 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 17.1360000371933 +/- 4.63505939155724
Measured from: 0.15200001001358
to: 17.2880000472069 [s; relative to TRIGTIME]
T50: 5.2960000038147 +/- 0.632961314364614
Measured from: 2.1360000371933
to: 7.432000041008 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.64400005340576
to: 4.64400005340576 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.919999957084656
to: 24.0560000538826 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.747507 1.086264 0.858374 0.278899
0.037536 0.039567 0.034742 0.028466 [error]
Peak 0.085199 0.126186 0.118908 0.024352
0.008383 0.009522 0.008786 0.006611 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 24.976 -0.920 24.056
T90 17.136 0.152 17.288
T50 5.296 2.136 7.432
Peak 1.000 3.644 4.644
====== 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: 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 -1.456 -0.074 0.074 - - - 8.29e-03 -3.37e-04 3.37e-04 76.650 57
CPL -1.351 -0.153 0.258 305.910 -305.910 -305.910 9.29e-03 -2.11e-03 2.73e-03 76.800 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 -1.384 -0.132 0.132 - - - 2.48e-02 -1.94e-03 1.94e-03 56.280 57
CPL -1.077 -0.372 0.549 160.891 -71.519 -160.891 3.49e-02 -1.14e-02 2.79e-02 55.170 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 2.54e-07 4.79e-07 6.98e-07 2.17e-06 1.98e-06 3.60e-06 erg/cm2
90%_error_low -1.97e-08 -2.21e-08 -3.51e-08 -2.36e-07 -8.61e-08 -2.58e-07 erg/cm2
90%_error_hi 2.02e-08 2.20e-08 3.50e-08 2.55e-07 8.62e-08 2.73e-07 erg/cm2
Peak flux PL 9.14e-01 9.85e-01 7.55e-01 9.45e-01 3.01e+00 3.60e+00 ph/cm2/s
90%_error_low -1.25e-01 -8.58e-02 -7.12e-02 -1.72e-01 -2.41e-01 -2.85e-01 ph/cm2/s
90%_error_hi 1.31e-01 8.50e-02 7.05e-02 1.93e-01 2.41e-01 2.87e-01 ph/cm2/s
Fluence CPL 3.09e-07 4.88e-07 4.74e-07 1.02e-06 1.68e-06 2.39e-06 erg/cm2
90%_error_low N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_hi N/A N/A N/A N/A N/A N/A erg/cm2
Peak flux CPL 8.57e-01 1.01e+00 7.82e-01 6.86e-01 2.98e+00 3.34e+00 ph/cm2/s
90%_error_low -1.54e-01 -9.58e-02 -8.32e-02 -2.70e-01 -2.47e-01 -3.79e-01 ph/cm2/s
90%_error_hi 1.57e-01 9.79e-02 8.52e-02 3.24e-01 2.47e-01 4.37e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 89.1597 -57.9672 0.0042 35.7833 -27.5476 2.5879829 45.093 TRIG_00633180 Foreground time interval of the image: -0.920 10.221 (delta_t = 11.141 [sec]) Background time interval of the image: -530.779 -513.503 (delta_t = 17.277 [sec]) -239.280 -0.920 (delta_t = 238.360 [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.
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 -0.920 sec. to 24.056 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.45567 ( -0.0741257 0.0742473 ) Norm@50keV : 8.28846E-03 ( -0.000337222 0.000337147 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 76.65 using 59 PHA bins. # Reduced chi-squared = 1.345 for 57 degrees of freedom # Null hypothesis probability = 4.231770e-02 Photon flux (15-150 keV) in 24.98 sec: 1.02291 ( -0.044742 0.04484 ) ph/cm2/s Energy fluence (15-150 keV) : 1.97949e-06 ( -8.60848e-08 8.62395e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.920 sec. to 24.056 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.3511 ( -0.10952 0.30123 ) Epeak [keV] : 305.910 ( -534.96 -534.96 ) Norm@50keV : 9.29479E-03 ( -0.00166574 0.00317433 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 76.80 using 59 PHA bins. # Reduced chi-squared = 1.371 for 56 degrees of freedom # Null hypothesis probability = 3.395177e-02 Photon flux (15-150 keV) in 24.98 sec: 1.01948 ( -0.047335 0.04481 ) ph/cm2/s Energy fluence (15-150 keV) : 1.67549e-06 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.644 sec. to 4.644 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.38442 ( -0.132158 0.131781 ) Norm@50keV : 2.48029E-02 ( -0.00194227 0.00193837 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.28 using 59 PHA bins. # Reduced chi-squared = 0.9873 for 57 degrees of freedom # Null hypothesis probability = 5.022120e-01 Photon flux (15-150 keV) in 1 sec: 3.01007 ( -0.24108 0.24138 ) ph/cm2/s Energy fluence (15-150 keV) : 2.40464e-07 ( -2.0592e-08 2.071e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.644 sec. to 4.644 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.07718 ( -0.372442 0.54902 ) Epeak [keV] : 160.891 ( -71.5195 -160.891 ) Norm@50keV : 3.48813E-02 ( -0.0114417 0.0278691 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.17 using 59 PHA bins. # Reduced chi-squared = 0.9851 for 56 degrees of freedom # Null hypothesis probability = 5.063945e-01 Photon flux (15-150 keV) in 1 sec: 2.97681 ( -0.2474 0.2472 ) ph/cm2/s Energy fluence (15-150 keV) : 2.37023e-07 ( -2.15514e-08 2.15124e-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 = 6.390636812100443E-01, IMY = 3.333504845329644E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -530.779400 -513.502600 -239.280000 -0.920000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5142 -40.5747 1.3 24.3 40.5 2.1292 8.8 1.4 Vela X-1 170.2385 -60.4780 20.4 5.0 -153.8 0.1164 0.6 9.0 Cen X-3 186.6201 -62.8633 4.4 13.0 -148.2 0.5705 2.7 5.7 GX 301-2 224.9295 -23.7382 2.7 56.5 173.6 5.5570 4.3 ------ UNKNOWN 217.6760 -38.5993 3.6 40.9 179.1 1.0871 3.2 ------ UNKNOWN 164.3486 -79.5865 2.5 20.8 -88.8 1.1518 4.6 ------ UNKNOWN 249.3446 -37.8229 3.5 57.6 -156.3 5.0751 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.920000 10.220590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.7759 -40.4549 0.0 24.3 41.0 0.0809 1.6 12.8 Vela X-1 169.9594 -60.5046 0.0 4.9 -153.0 -0.0175 -0.4 12.7 Cen X-3 186.8561 -62.7610 7.2 13.1 -148.7 -0.0716 -1.6 5.5 GX 301-2 89.1597 -57.9672 0.3 35.8 -27.5 2.5879 45.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 66.220590 183.135300 184.720000 542.920600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5370 -40.5572 1.6 34.0 98.1 4.5424 7.2 0.4 Vela X-1 170.0276 -60.6324 3.2 38.7 147.7 2.2715 3.6 8.5 Cen X-3 186.5843 -62.7772 3.0 43.7 157.4 3.1155 3.9 2.0 GX 301-2 83.0523 -66.3573 2.0 8.9 -145.5 1.7490 5.8 ------ UNKNOWN 241.2521 -74.6874 2.3 46.1 -171.5 2.8238 5.0 ------ UNKNOWN 33.1940 -34.5831 4.1 43.5 -64.2 5.7130 2.9 ------ UNKNOWN 33.1684 -34.2574 3.8 43.8 -63.9 6.6690 3.3 ------ UNKNOWN 335.4881 -64.0763 3.5 48.0 -129.0 5.8198 3.3 ------ UNKNOWN 20.4536 -47.7862 3.3 40.8 -88.2 6.2290 3.5 ------ UNKNOWN