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 Sep 15 19:50:19 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger294120
======================================================================
Trigger: 00294120 Segment: 000
BAT Trigger Time: 213970161.344 [s; MET]
Trigger Stop: 213970177.728 [s; MET]
UTC: 2007-10-13T12:09:19.055540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 279.524890921608 Dec: 33.8574571315757 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.84
Image Trigger?: NO
Rate S/N Ratio: 10.9087121146357 [ if not an image trigger ]
Image S/N Ratio: 7.84
Analysis Position: [ source = BAT ]
RA: 279.524890921608 Dec: 33.8574571315757 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 279.525 Dec: 33.8575 [deg; J2000]
{ 18h 38m 06.0s , +33d 51' 27.0" }
+/- 2.66158841925 [arcmin] (estimated 90% radius based on SNR)
SNR: 7.51330565953
Angular difference between the analysis and refined position is 0.006013 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 75.5840000212193 +/- 25.7891412844253
Measured from: 4.11199998855591
to: 79.6960000097752 [s; relative to TRIGTIME]
T50: 49.216000020504 +/- 35.7333842698928
Measured from: 9.16799998283386
to: 58.3840000033379 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.64399999380112
to: 4.64399999380112 [s; relative to TRIGTIME]
Total Fluence
Measured from: 3.59999999403954
to: 81.5519999861717 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.232546 0.211041 0.098366 0.135400
0.053378 0.054153 0.046876 0.040838 [error]
Peak 0.019051 0.012944 0.007794 0.008489
0.006024 0.006091 0.005293 0.004623 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 77.952 3.600 81.552
T90 75.584 4.112 79.696
T50 49.216 9.168 58.384
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: 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 -1.607 -0.517 0.501 - - - 5.42e-04 -1.50e-04 1.41e-04 45.280 57
CPL -1.642 -1.501 0.348 9999.360 N/A N/A 5.32e-04 N/A N/A 45.310 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 -1.924 -1.178 0.989 - - - 2.50e-03 -2.50e-03 1.32e-03 54.900 57
CPL -1.905 -1.790 1.042 9999.350 N/A N/A 2.52e-03 N/A N/A 54.910 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 5.96e-08 1.03e-07 1.35e-07 3.60e-07 3.95e-07 6.57e-07 erg/cm2
90%_error_low -2.44e-08 -2.60e-08 -5.04e-08 -2.20e-07 -1.14e-07 -2.74e-07 erg/cm2
90%_error_hi 2.62e-08 2.54e-08 4.95e-08 3.95e-07 1.17e-07 4.15e-07 erg/cm2
Peak flux PL 1.55e-01 1.21e-01 6.38e-02 4.87e-02 3.62e-01 3.88e-01 ph/cm2/s
90%_error_low -1.55e-01 -5.28e-02 -6.38e-02 -4.87e-02 -1.49e-01 -1.64e-01 ph/cm2/s
90%_error_hi 1.02e-01 5.01e-02 5.01e-02 1.36e-01 1.49e-01 1.68e-01 ph/cm2/s
Fluence CPL 5.14e-08 7.15e-08 7.67e-08 1.88e-07 2.50e-07 3.88e-07 erg/cm2
90%_error_low N/A -4.30e-08 -4.51e-08 -1.11e-07 -1.47e-07 -1.73e-07 erg/cm2
90%_error_hi N/A 3.14e-08 2.64e-08 8.26e-08 9.10e-08 9.99e-08 erg/cm2
Peak flux CPL 1.39e-01 8.56e-02 3.59e-02 2.47e-02 2.72e-01 2.88e-01 ph/cm2/s
90%_error_low -1.07e-01 -8.56e-02 -3.59e-02 -2.47e-02 N/A N/A ph/cm2/s
90%_error_hi 1.11e-01 7.58e-02 4.52e-02 4.60e-02 N/A N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-50.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 279.525 33.858 0.000 30.683 -35.567 0.277 7.513 TRIG_00294120 Image time interval: 0.000 to 16.384 [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 3.600 sec. to 81.552 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.60675 ( -0.516572 0.500654 ) Norm@50keV : 5.42055E-04 ( -0.000150132 0.000141117 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.28 using 59 PHA bins. # Reduced chi-squared = 0.7943 for 57 degrees of freedom # Null hypothesis probability = 8.686642e-01 Photon flux (15-150 keV) in 77.95 sec: 6.98064E-02 ( -0.0172359 0.0172525 ) ph/cm2/s Energy fluence (15-150 keV) : 3.94863e-07 ( -1.13798e-07 1.17015e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.600 sec. to 81.552 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.89965 ( -0.239943 1.60869 ) Epeak [keV] : 271.066 ( ) Norm@50keV : 1.24248E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.42 using 59 PHA bins. # Reduced chi-squared = 0.7754 for 56 degrees of freedom # Null hypothesis probability = 8.900495e-01 Photon flux (15-150 keV) in 77.95 sec: 5.01634E-02 ( -0.0302837 0.0212873 ) ph/cm2/s Energy fluence (15-150 keV) : 2.49998e-07 ( -1.46856e-07 9.09715e-08 ) 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: -1.92433 ( -1.1767 0.990105 ) Norm@50keV : 2.49549E-03 ( -0.00249375 0.00131916 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.90 using 59 PHA bins. # Reduced chi-squared = 0.9632 for 57 degrees of freedom # Null hypothesis probability = 5.541346e-01 Photon flux (15-150 keV) in 1 sec: 0.361915 ( -0.149376 0.149385 ) ph/cm2/s Energy fluence (15-150 keV) : 2.29372e-08 ( -1.19739e-08 1.32938e-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: -3.29857 ( -0.431637 2.3996 ) Epeak [keV] : 359.785 ( ) Norm@50keV : 5.38378E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.00 using 59 PHA bins. # Reduced chi-squared = 0.9644 for 56 degrees of freedom # Null hypothesis probability = 5.507601e-01 Photon flux (15-150 keV) in 1 sec: 0.272235 ( ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 75.584 sec. Hardness ratio (energy fluence ratio) = 1.31322797286
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.6233043e-07 S(50-150 keV) = 2.3253226e-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 = 0.482663359722, IMY = 0.345128921831
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: -239.344000 -96.030100 -95.344000 3.600000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 268.4657 -1.3245 6.5 35.3 -105.7 0.7148 1.8 9.7 SW J1753.5-0127 270.4310 -25.1110 43.0 47.2 -137.6 -0.1607 -0.3 8.2 GX 5-1 270.4299 -25.6691 10.6 47.6 -138.1 -0.6837 -1.1 8.2 GRS 1758-258 273.9092 -14.0722 6.1 37.2 -129.0 0.6223 1.9 6.0 GX 17+2 276.0511 -30.3061 9.0 48.1 -147.3 -0.5879 -1.3 7.5 H1820-303 285.0240 -24.9182 6.3 39.4 -153.2 0.5611 1.8 0.7 HT1900.1-2455 288.7747 10.9527 0.8 12.8 -86.0 2.6277 14.6 1.5 GRS 1915+105 299.5914 35.2070 0.3 24.4 -1.9 8.7636 45.4 0.3 Cyg X-1 308.1467 40.9538 1.3 30.6 12.0 1.7861 8.7 1.7 Cyg X-3 326.2398 38.3951 3.1 35.1 36.8 1.0844 3.8 5.4 Cyg X-2 308.0571 37.6600 1.2 27.4 13.3 1.9402 9.8 ------ UNKNOWN 293.4093 -47.2584 2.8 58.6 -170.9 4.6168 4.1 ------ UNKNOWN 284.2330 34.1155 2.6 28.2 -29.4 0.8684 4.5 ------ UNKNOWN 265.4020 -22.1502 2.1 48.6 -130.5 4.4814 5.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 3.600000 81.552000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 268.4966 -1.3234 9.0 35.3 -105.7 -0.2358 -1.3 10.9 SW J1753.5-0127 270.4323 -25.1182 10.6 47.2 -137.6 0.2966 1.1 8.4 GX 5-1 270.4413 -25.7319 13.2 47.7 -138.2 0.2377 0.9 7.5 GRS 1758-258 274.0057 -14.0377 926.5 37.2 -129.0 -0.0020 -0.0 0.1 GX 17+2 275.7784 -30.3160 4.8 48.2 -147.0 0.5831 2.4 8.2 H1820-303 285.1127 -24.9051 8.7 39.3 -153.3 -0.1883 -1.3 4.3 HT1900.1-2455 288.7048 11.0025 2.8 12.8 -85.8 -0.3979 -4.1 6.5 GRS 1915+105 299.4199 35.2446 5.5 24.4 -2.2 0.2067 2.1 8.7 Cyg X-1 307.9645 41.0738 3.5 30.7 11.6 0.3573 3.3 9.8 Cyg X-3 326.0389 38.2319 6.6 34.9 36.8 0.2741 1.7 8.3 Cyg X-2 322.6710 52.4923 2.0 44.9 20.4 1.2244 5.7 ------ UNKNOWN 311.6680 -28.4887 2.4 40.5 169.1 0.7401 4.9 ------ UNKNOWN 311.0242 -21.7267 2.9 33.9 166.9 0.5059 3.9 ------ UNKNOWN 294.2004 67.6614 2.5 57.0 -0.9 2.5605 4.6 ------ UNKNOWN 279.4873 33.8050 1.8 30.7 -35.7 0.6973 6.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 791.556610 962.664100 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.2040 38.4322 54.3 35.5 -89.7 0.0652 0.2 6.8 Cyg X-2 37.0729 11.6921 2.3 35.2 59.9 1.3140 5.0 ------ UNKNOWN 319.6173 -15.2878 2.5 54.3 -166.1 1.8712 4.6 ------ UNKNOWN