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: Mon Jan 26 10:56:01 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger623158
======================================================================
Trigger: 00623158 Segment: 000
BAT Trigger Time: 441786546.692 [s; MET]
Trigger Stop: 441786546.756 [s; MET]
UTC: 2015-01-01T06:28:53.699400 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 312.631006525829 Dec: 36.727689408524 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.46
Image Trigger?: NO
Rate S/N Ratio: 19.4422220952236 [ if not an image trigger ]
Image S/N Ratio: 7.46
Analysis Position: [ source = BAT ]
RA: 312.631006525829 Dec: 36.727689408524 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 312.589429830046 Dec: 36.6686981122609 [deg; J2000]
{ 20h 50m 21.5s , +36d 40' 07.3" }
+/- 2.43699652265558 [arcmin] (estimated 90% radius based on SNR)
+/- 1.534244329743 [arcmin] (formal 1-sigma fit error)
SNR: 8.52056726461872
Angular difference between the analysis and refined position is 4.065530 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 0.059999942779541 +/- 0.0113137314268704
Measured from: 0.00400000810623169
to: 0.0639999508857727 [s; relative to TRIGTIME]
T50: 0.031999945640564 +/- 0.0178885800721685
Measured from: 0.0200000405311584
to: 0.0519999861717224 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.46399998664856
to: 0.53600001335144 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0680000185966492 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.006769 0.016512 0.015015 0.001700
0.002154 0.002727 0.002806 0.002121 [error]
Peak -0.005831 0.026621 0.014870 0.011075
0.006811 0.007201 0.006211 0.005533 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.068 0.000 0.068
T90 0.060 0.004 0.064
T50 0.032 0.020 0.052
Peak 1.000 -0.464 0.536
====== 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 -1.500 -3.136 -1.843 - - - 0.00e+00 8.70e-04 4.03e-03 112.410 57
CPL -1.000 N/A N/A 80.000 N/A N/A 0.00e+00 N/A N/A 112.410 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 -0.849 -0.709 0.927 - - - 2.66e-03 -1.36e-03 1.31e-03 53.240 57
CPL 2.988 -3.543 -2.988 63.389 -21.386 172.944 2.13e-01 -2.13e-01 6.68e+03 50.820 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 1.94e-09 9.23e-10 2.68e-10 9.76e-11 3.18e-09 3.23e-09 erg/cm2
90%_error_low -8.29e-10 -4.77e-10 -1.91e-10 -8.32e-11 -1.40e-09 -1.43e-09 erg/cm2
90%_error_hi 8.26e-10 4.54e-10 2.06e-10 1.32e-10 1.39e-09 1.43e-09 erg/cm2
Peak flux PL 5.83e-02 8.70e-02 9.71e-02 2.05e-01 3.04e-01 4.46e-01 ph/cm2/s
90%_error_low -5.83e-02 -5.34e-02 -4.68e-02 -2.05e-01 -1.46e-01 -2.18e-01 ph/cm2/s
90%_error_hi 6.57e-02 5.44e-02 4.66e-02 2.89e-01 1.52e-01 2.59e-01 ph/cm2/s
Fluence CPL 3.81e-10 6.60e-09 7.95e-09 1.99e-10 1.51e-08 1.51e-08 erg/cm2
90%_error_low -3.10e-10 -2.05e-09 -2.99e-09 -1.55e-10 -3.41e-09 -3.39e-09 erg/cm2
90%_error_hi 8.16e-10 1.81e-09 3.27e-09 1.96e-10 3.40e-09 3.42e-09 erg/cm2
Peak flux CPL 8.82e-03 1.34e-01 9.34e-02 5.64e-04 2.36e-01 2.36e-01 ph/cm2/s
90%_error_low -8.82e-03 -7.65e-02 -5.87e-02 -5.64e-04 -9.98e-02 -9.99e-02 ph/cm2/s
90%_error_hi 7.28e-02 8.76e-02 7.64e-02 1.51e-01 1.61e-01 1.81e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 312.5894 36.6687 0.0225 13.9445 -104.5282 0.0438136 8.521 TRIG_00623158 Foreground time interval of the image: 0.000 0.068 (delta_t = 0.068 [sec]) Background time interval of the image: -126.591 0.000 (delta_t = 126.591 [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 0.000 sec. to 0.068 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -3.79848 ( -0.853731 0.439971 ) Norm@50keV : 2.44386E-03 ( -0.00159132 0.00157306 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 97.49 using 59 PHA bins. # Reduced chi-squared = 1.710 for 57 degrees of freedom # Null hypothesis probability = 6.744175e-04 Photon flux (15-150 keV) in 0.068 sec: 1.26843 ( -0.541475 0.54015 ) ph/cm2/s Energy fluence (15-150 keV) : 3.18397e-09 ( -1.40155e-09 1.38627e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.068 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1 ( ) Epeak [keV] : 80.0000 ( ) Norm@50keV : 0.0 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 112.41 using 59 PHA bins. # Reduced chi-squared = 2.0074 for 56 degrees of freedom # Null hypothesis probability = 1.173343e-05 Photon flux (15-150 keV) in 0.068 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.51241e-08 ( -3.40702e-09 3.40436e-09 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.464 sec. to 0.536 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.84917 ( -0.71902 0.916926 ) Norm@50keV : 2.65570E-03 ( -0.00135904 0.00131039 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.24 using 59 PHA bins. # Reduced chi-squared = 0.9341 for 57 degrees of freedom # Null hypothesis probability = 6.168036e-01 Photon flux (15-150 keV) in 1 sec: 0.304420 ( -0.145885 0.152104 ) ph/cm2/s Energy fluence (15-150 keV) : 3.04502e-08 ( -1.4735e-08 1.5057e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.464 sec. to 0.536 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 9.57437 ( -10.0973 -9.5419 ) Epeak [keV] : 52.1721 ( -10.1821 184.148 ) Norm@50keV : 393.047 ( -362.379 6319.03 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.04 using 59 PHA bins. # Reduced chi-squared = 0.8936 for 56 degrees of freedom # Null hypothesis probability = 6.987688e-01 Photon flux (15-150 keV) in 1 sec: 0.236238 ( -0.099803 0.160789 ) ph/cm2/s Energy fluence (15-150 keV) : 1.80443e-08 ( -7.77502e-09 1.85135e-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 = -6.228787252569472E-02, IMY = 2.403604035610543E-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: -126.591400 0.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3144 35.2505 4.5 48.7 -30.1 -0.8338 -2.6 8.9 Her X-1 299.5788 35.1937 0.9 20.6 -75.8 2.2278 12.7 0.7 Cyg X-1 308.1179 40.9789 2.0 11.9 -81.3 0.8808 5.6 1.6 Cyg X-3 326.4414 38.3258 0.0 12.3 -154.5 0.2138 1.4 12.7 Cyg X-2 251.3819 50.3123 2.7 42.3 -10.6 0.9179 4.3 ------ UNKNOWN 315.2856 4.1773 2.7 45.6 -122.7 2.9204 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.000000 0.068000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3378 35.2415 79.1 48.7 -30.1 0.0015 0.1 8.4 Her X-1 299.4192 35.1920 4.7 20.7 -75.5 0.0142 2.5 8.4 Cyg X-1 307.8430 40.8981 0.0 12.1 -80.8 0.0101 2.1 12.5 Cyg X-3 326.1259 38.1541 4.5 12.4 -153.1 -0.0126 -2.6 10.3 Cyg X-2 312.5893 36.6688 1.4 13.9 -104.5 0.0438 8.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 45.008590 962.468000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5153 35.4489 9.6 46.2 -14.4 1.3402 1.2 7.0 Her X-1 288.8030 10.9224 1.3 33.6 -75.3 11.5457 9.0 1.4 GRS 1915+105 299.5985 35.2040 0.5 10.7 -35.6 15.8463 24.9 0.4 Cyg X-1 308.1270 40.9636 0.8 5.5 20.5 8.0718 13.7 1.0 Cyg X-3 326.0537 38.2055 12.3 10.7 137.0 -0.6121 -0.9 8.9 Cyg X-2 349.8618 16.6127 3.0 38.5 170.3 4.2425 3.9 ------ UNKNOWN 252.7736 45.2190 2.4 44.9 -0.7 5.1426 4.8 ------ UNKNOWN 317.8324 15.1451 2.3 22.1 -134.6 3.1364 5.1 ------ UNKNOWN 264.5164 20.8621 3.4 44.5 -38.3 3.8242 3.4 ------ UNKNOWN 343.2530 -13.5566 4.5 58.0 -156.8 11.4962 2.6 ------ UNKNOWN 311.9059 0.1435 3.6 36.6 -119.9 3.1364 3.2 ------ UNKNOWN 246.1302 21.7507 4.4 58.8 -26.1 11.1074 2.6 ------ UNKNOWN 267.5494 11.5206 2.7 47.6 -51.2 12.0001 4.2 ------ UNKNOWN