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: Wed Jan 22 19:10:33 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger175942
======================================================================
Trigger: 00175942 Segment: 000
BAT Trigger Time: 158136568.384 [s; MET]
Trigger Stop: 158136569.408 [s; MET]
UTC: 2006-01-05T06:49:27.446760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 297.473683880003 Dec: 46.3625146711849 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.4
Image Trigger?: NO
Rate S/N Ratio: 77.7045687202497 [ if not an image trigger ]
Image S/N Ratio: 14.4
Analysis Position: [ source = BAT ]
RA: 297.473683880003 Dec: 46.3625146711849 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 297.490792296574 Dec: 46.3553167009083 [deg; J2000]
{ 19h 49m 57.8s , +46d 21' 19.1" }
+/- 0.909580578003676 [arcmin] (estimated 90% radius based on SNR)
+/- 0.264805068930653 [arcmin] (formal 1-sigma fit error)
SNR: 34.8270505702139
Angular difference between the analysis and refined position is 0.829694 arcmin
Partial Coding Fraction: 0.2851562 [ including projection effects ]
Duration
T90: 54.3760000169277 +/- 1.42005071887118
Measured from: -17.8760000169277
to: 36.5 [s; relative to TRIGTIME]
T50: 25.944000005722 +/- 0.413879213185527
Measured from: 4.17199999094009
to: 30.1159999966621 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 30.4160000085831
to: 31.4160000085831 [s; relative to TRIGTIME]
Total Fluence
Measured from: -21.0480000078678
to: 66.5399999916553 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.145485 7.699234 8.605156 3.526818
0.089326 0.100687 0.099278 0.085742 [error]
Peak 0.137210 0.285700 0.350326 0.144956
0.011097 0.013568 0.014763 0.011720 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 87.588 -21.048 66.540
T90 54.376 -17.876 36.500
T50 25.944 4.172 30.116
Peak 1.000 30.416 31.416
====== 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 -1.062 -0.032 0.032 - - - 1.96e-02 -3.50e-04 3.49e-04 37.300 57
CPL -0.997 -0.074 0.070 998.313 -998.313 -998.313 2.08e-02 -1.40e-03 8.16e-04 38.460 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 -0.903 -0.083 0.084 - - - 6.34e-02 -3.10e-03 3.09e-03 65.090 57
CPL -0.682 -0.195 0.341 359.689 -359.689 -359.689 7.88e-02 -1.79e-02 3.01e-02 63.690 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 1.46e-06 3.50e-06 6.71e-06 3.14e-05 1.82e-05 4.31e-05 erg/cm2
90%_error_low -5.78e-08 -8.26e-08 -1.14e-07 -1.28e-06 -3.01e-07 -1.30e-06 erg/cm2
90%_error_hi 5.89e-08 8.25e-08 1.14e-07 1.32e-06 3.01e-07 1.34e-06 erg/cm2
Peak flux PL 1.48e+00 2.12e+00 2.27e+00 4.52e+00 7.28e+00 1.04e+01 ph/cm2/s
90%_error_low -1.48e-01 -1.33e-01 -1.15e-01 -4.79e-01 -3.56e-01 -5.54e-01 ph/cm2/s
90%_error_hi 1.54e-01 1.32e-01 1.14e-01 5.14e-01 3.57e-01 5.64e-01 ph/cm2/s
Fluence CPL 1.45e-06 3.50e-06 6.70e-06 3.14e-05 1.82e-05 4.09e-05 erg/cm2
90%_error_low N/A -5.36e-08 -1.14e-07 N/A -3.57e-07 -2.16e-06 erg/cm2
90%_error_hi N/A 8.70e-08 1.47e-07 N/A 2.98e-07 6.79e-07 erg/cm2
Peak flux CPL 1.39e+00 2.14e+00 2.34e+00 3.65e+00 7.22e+00 9.53e+00 ph/cm2/s
90%_error_low -1.92e-01 -1.38e-01 -7.13e-02 -9.45e-01 -3.64e-01 -1.01e+00 ph/cm2/s
90%_error_hi 1.83e-01 1.39e-01 1.51e-01 7.66e-01 3.64e-01 1.14e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 297.4908 46.3553 0.0056 42.9199 20.8052 11.9637806 34.827 TRIG_00175942 Foreground time interval of the image: -21.048 15.317 (delta_t = 36.365 [sec]) Background time interval of the image: -27.483 -21.048 (delta_t = 6.435 [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 -21.048 sec. to 66.540 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.06218 ( -0.0315247 0.0316875 ) Norm@50keV : 1.95825E-02 ( -0.000349956 0.000348495 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.30 using 59 PHA bins. # Reduced chi-squared = 0.6544 for 57 degrees of freedom # Null hypothesis probability = 9.798102e-01 Photon flux (15-150 keV) in 87.59 sec: 2.26385 ( -0.04296 0.04312 ) ph/cm2/s Energy fluence (15-150 keV) : 1.81574e-05 ( -3.0057e-07 3.01014e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.048 sec. to 66.540 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.05608 ( -0.0742572 0.0701898 ) Epeak [keV] : 9996.86 ( -9996.98 -9996.98 ) Norm@50keV : 1.96904E-02 ( -0.000329397 0.00188761 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.34 using 59 PHA bins. # Reduced chi-squared = 0.6668 for 56 degrees of freedom # Null hypothesis probability = 9.740294e-01 Photon flux (15-150 keV) in 87.59 sec: 2.26618 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.81633e-05 ( -3.56942e-07 2.9812e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 30.416 sec. to 31.416 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.902569 ( -0.0829502 0.084061 ) Norm@50keV : 6.34001E-02 ( -0.00309872 0.00308937 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.09 using 59 PHA bins. # Reduced chi-squared = 1.142 for 57 degrees of freedom # Null hypothesis probability = 2.159046e-01 Photon flux (15-150 keV) in 1 sec: 7.27702 ( -0.35641 0.35674 ) ph/cm2/s Energy fluence (15-150 keV) : 7.10886e-07 ( -3.65288e-08 3.66119e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 30.416 sec. to 31.416 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.681837 ( -0.195353 0.340989 ) Epeak [keV] : 359.689 ( -359.689 -359.689 ) Norm@50keV : 7.88109E-02 ( -0.0178769 0.0301428 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.69 using 59 PHA bins. # Reduced chi-squared = 1.137 for 56 degrees of freedom # Null hypothesis probability = 2.241186e-01 Photon flux (15-150 keV) in 1 sec: 7.22480 ( -0.36392 0.36417 ) ph/cm2/s Energy fluence (15-150 keV) : 7.06431e-07 ( -3.75328e-08 3.74098e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 54.376 sec. Hardness ratio (energy fluence ratio) = 1.91562275816
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.957293e-06 S(50-150 keV) = 1.3200253e-05
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 = 8.692680592359927E-01, IMY = -3.302945234494673E-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: -27.483400 -21.048000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 288.8145 10.9732 3.0 37.8 -35.9 0.1359 3.8 1.9 GRS 1915+105 299.6374 35.1920 1.5 34.4 8.8 0.2470 7.9 2.4 Cyg X-1 308.1896 40.7799 0.0 33.7 24.4 -0.0637 -1.9 11.0 Cyg X-3 326.1115 38.3725 52.5 26.7 48.9 0.0066 0.2 4.2 Cyg X-2 334.4990 47.3408 2.6 36.2 59.3 0.2560 4.5 ------ UNKNOWN 14.5090 -4.7581 2.8 49.7 157.7 0.3147 4.1 ------ UNKNOWN 276.3041 39.5650 2.5 52.9 2.4 0.3543 4.6 ------ UNKNOWN 307.9951 27.6616 2.4 24.2 5.3 0.1211 4.9 ------ UNKNOWN 352.6488 -28.2649 2.8 46.8 -159.9 0.1854 4.1 ------ UNKNOWN 316.8707 -13.1302 2.6 26.9 -105.8 0.1377 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -21.048000 15.316620 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 288.7627 10.9694 1547.7 37.8 -35.9 -0.0017 -0.0 2.5 GRS 1915+105 299.8137 35.2521 7.4 34.3 9.1 -0.3358 -1.5 11.4 Cyg X-1 307.9616 41.0473 62.0 34.0 24.5 -0.0455 -0.2 8.8 Cyg X-3 326.1975 38.1318 0.0 26.5 49.1 -0.0859 -0.4 11.5 Cyg X-2 330.5127 48.4691 2.3 36.9 54.6 1.9190 5.0 ------ UNKNOWN 297.4908 46.3553 0.3 42.9 20.8 11.9638 34.8 ------ UNKNOWN 300.4955 38.2015 2.1 35.8 13.7 1.2333 5.5 ------ UNKNOWN 339.4576 -20.1625 2.1 34.0 -149.5 0.9876 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 76.716590 302.672800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4487 35.2769 7.1 33.9 -14.6 0.3417 1.6 4.0 Her X-1 288.7847 10.9430 1.7 36.2 -86.7 3.1661 7.0 0.8 GRS 1915+105 299.5954 35.2005 0.2 11.3 -110.1 8.5628 51.8 0.3 Cyg X-1 308.0772 40.9720 1.4 9.4 -159.9 1.3565 8.3 1.9 Cyg X-3 326.0841 38.4460 3.2 22.4 179.2 0.5818 3.6 8.5 Cyg X-2 261.9401 52.3445 2.2 23.6 16.5 0.9282 5.1 ------ UNKNOWN 352.4429 24.0744 1.9 48.9 176.2 2.3139 6.0 ------ UNKNOWN 297.3729 46.3538 2.3 0.1 -23.4 0.8229 4.9 ------ UNKNOWN 265.2287 34.5538 2.5 27.0 -25.6 0.7697 4.7 ------ UNKNOWN 230.3134 23.0171 2.6 58.0 -10.4 4.2701 4.5 ------ UNKNOWN