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 21:59:26 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger130088
======================================================================
Trigger: 00130088 Segment: 000
BAT Trigger Time: 138672173.056 [s; MET]
Trigger Stop: 138672173.12 [s; MET]
UTC: 2005-05-25T00:02:53.517080 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 278.144062379166 Dec: 26.3398415321529 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18
Image Trigger?: NO
Rate S/N Ratio: 81.2834546509928 [ if not an image trigger ]
Image S/N Ratio: 18
Analysis Position: [ source = BAT ]
RA: 278.144062379166 Dec: 26.3398415321529 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 278.138110425539 Dec: 26.3393182721794 [deg; J2000]
{ 18h 32m 33.1s , +26d 20' 21.5" }
+/- 0.339732639503496 [arcmin] (estimated 90% radius based on SNR)
+/- 0.0981280526302253 [arcmin] (formal 1-sigma fit error)
SNR: 142.207425874992
Angular difference between the analysis and refined position is 0.321578 arcmin
Partial Coding Fraction: 0.78125 [ including projection effects ]
Duration
T90: 8.83599999547005 +/- 0.0708802014549775
Measured from: 0.328000009059906
to: 9.16400000452995 [s; relative to TRIGTIME]
T50: 5.22400000691414 +/- 0.0256125069658732
Measured from: 1.37200000882149
to: 6.59600001573563 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.543999999761581
to: 1.54399999976158 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.120000004768372
to: 12.6759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.144629 10.285507 7.008009 1.181263
0.038927 0.045504 0.039560 0.024059 [error]
Peak 1.098535 1.982178 1.730768 0.376896
0.014593 0.019074 0.018561 0.010591 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 12.796 -0.120 12.676
T90 8.836 0.328 9.164
T50 5.224 1.372 6.596
Peak 1.000 0.544 1.544
====== 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: CPL)
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 -1.783 N/A N/A - - - 1.32e-01 N/A N/A 212.750 57
CPL -1.026 -0.100 0.102 80.400 -2.918 3.478 2.67e-01 -2.29e-02 2.55e-02 25.900 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 -1.400 N/A N/A - - - 3.60e-01 N/A N/A 165.620 57
CPL -0.603 -0.125 0.128 106.319 -6.786 8.837 7.76e-01 -8.54e-02 9.82e-02 31.120 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 2.82e-06 4.36e-06 5.07e-06 1.13e-05 1.56e-05 2.36e-05 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 PL 1.35e+01 1.44e+01 1.09e+01 1.34e+01 4.39e+01 5.22e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 2.20e-06 4.40e-06 5.55e-06 6.21e-06 1.51e-05 1.84e-05 erg/cm2
90%_error_low -9.69e-08 -7.64e-08 -8.80e-08 -4.12e-07 -2.00e-07 -4.60e-07 erg/cm2
90%_error_hi 9.87e-08 7.63e-08 8.82e-08 4.51e-07 2.00e-07 4.93e-07 erg/cm2
Peak flux CPL 1.26e+01 8.81e+00 4.24e+00 3.43e+00 2.71e+01 2.81e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 278.1381 26.3393 0.0014 26.0370 19.0621 25.2747729 142.207 TRIG_00130088 Foreground time interval of the image: -0.120 9.245 (delta_t = 9.365 [sec]) Background time interval of the image: -136.355 -0.120 (delta_t = 136.235 [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 -0.120 sec. to 12.676 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.78273 ( ) Norm@50keV : 0.132077 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 212.75 using 59 PHA bins. # Reduced chi-squared = 3.7325 for 57 degrees of freedom # Null hypothesis probability = 8.108927e-20 Photon flux (15-150 keV) in 12.8 sec: 18.0805 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.55764e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.120 sec. to 12.676 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.02618 ( -0.0996255 0.101512 ) Epeak [keV] : 80.3998 ( -2.91784 3.47757 ) Norm@50keV : 0.266806 ( -0.0229097 0.0254571 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 25.90 using 59 PHA bins. # Reduced chi-squared = 0.4624 for 56 degrees of freedom # Null hypothesis probability = 9.998081e-01 Photon flux (15-150 keV) in 12.8 sec: 16.6595 ( -0.336 0.339 ) ph/cm2/s Energy fluence (15-150 keV) : 1.51314e-05 ( -1.99667e-07 1.9959e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.544 sec. to 1.544 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.39984 ( ) Norm@50keV : 0.360102 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 165.62 using 59 PHA bins. # Reduced chi-squared = 2.9057 for 57 degrees of freedom # Null hypothesis probability = 1.569646e-12 Photon flux (15-150 keV) in 1 sec: 43.8529 ( ) ph/cm2/s Energy fluence (15-150 keV) : 3.48009e-06 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.544 sec. to 1.544 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.602717 ( -0.124694 0.127884 ) Epeak [keV] : 106.319 ( -6.78648 8.83628 ) Norm@50keV : 0.776242 ( -0.0854009 0.0982065 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 31.12 using 59 PHA bins. # Reduced chi-squared = 0.5557 for 56 degrees of freedom # Null hypothesis probability = 9.971626e-01 Photon flux (15-150 keV) in 1 sec: 27.1367 ( ) ph/cm2/s Energy fluence (15-150 keV) : 3.40479e-06 ( -5.66007e-08 5.65957e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 8.836 sec. Hardness ratio (energy fluence ratio) = 1.26197306569
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.597985e-06 S(50-150 keV) = 8.533358e-06
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 = 4.617440444879775E-01, IMY = -1.595507843272130E-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: -136.355410 -0.120000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5945 35.3952 4.2 4.3 40.2 0.3087 2.7 7.4 Her X-1 288.7862 10.9243 2.5 43.7 28.4 1.2702 4.6 1.5 GRS 1915+105 299.5991 35.1987 0.5 39.0 -11.1 3.6847 23.8 0.5 Cyg X-1 308.1208 40.9801 3.8 43.6 -22.5 0.6055 3.1 1.7 Cyg X-3 326.0431 38.3955 70.9 57.4 -25.8 -0.1325 -0.2 7.5 Cyg X-2 274.7161 10.6811 2.6 35.0 45.5 0.9351 4.4 ------ UNKNOWN 238.2998 16.3173 2.0 24.4 119.5 0.8285 5.7 ------ UNKNOWN 302.7493 52.6102 2.6 38.4 -39.4 0.7630 4.5 ------ UNKNOWN 293.6158 61.3627 2.5 35.1 -55.3 0.8804 4.6 ------ UNKNOWN 177.3724 56.3464 2.5 50.1 -133.7 2.7702 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.120000 9.244600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4333 35.4077 6.5 4.2 41.3 0.3069 1.7 4.1 Her X-1 288.7453 10.9751 8.9 43.6 28.4 -0.5472 -1.3 3.6 GRS 1915+105 299.7135 35.2747 12.8 39.0 -11.3 0.2108 0.9 7.5 Cyg X-1 308.0299 40.9430 26.9 43.6 -22.4 -0.1328 -0.4 3.7 Cyg X-3 326.1961 38.4433 4.5 57.5 -25.9 2.9603 2.6 7.4 Cyg X-2 274.2058 8.2890 2.4 36.8 48.5 1.5927 4.7 ------ UNKNOWN 260.2902 11.8518 2.3 27.8 69.2 1.2390 4.9 ------ UNKNOWN 278.1381 26.3393 0.1 26.0 19.1 25.2746 142.2 ------ UNKNOWN 314.9451 34.3311 2.3 51.0 -16.6 2.1117 5.0 ------ UNKNOWN 173.8636 46.0278 3.8 55.2 -145.4 3.8977 3.0 ------ UNKNOWN 279.2378 77.4252 3.1 41.0 -80.8 2.8729 3.7 ------ UNKNOWN 264.6866 78.6385 3.8 40.8 -85.8 2.4914 3.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 63.644600 302.966800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5164 35.4749 5.8 22.2 170.0 0.3325 2.0 8.5 Her X-1 268.1628 -1.4877 0.0 29.4 70.5 0.2810 1.1 12.5 SW J1753.5-0127 273.9890 -14.1650 3.7 40.7 56.1 -1.6015 -3.1 7.8 GX 17+2 288.8195 10.8686 2.2 18.4 14.7 0.8120 5.2 4.8 GRS 1915+105 299.5872 35.1987 0.3 20.4 -71.2 6.9792 37.3 0.2 Cyg X-1 308.0546 40.9633 1.5 28.7 -78.5 1.8790 7.8 2.6 Cyg X-3 326.1379 38.4411 4.8 41.8 -69.3 1.5982 2.4 7.3 Cyg X-2 315.4304 23.8280 3.7 33.7 -44.2 0.6634 3.1 ------ UNKNOWN 223.1184 69.1613 3.1 53.3 -151.4 2.1932 3.8 ------ UNKNOWN