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 13 05:53:43 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger517469
======================================================================
Trigger: 00517469 Segment: 000
BAT Trigger Time: 353136826.304 [s; MET]
Trigger Stop: 353136826.56 [s; MET]
UTC: 2012-03-11T05:33:38.324140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 273.086737373698 Dec: 14.2755565148965 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.99
Image Trigger?: NO
Rate S/N Ratio: 25.0199920063936 [ if not an image trigger ]
Image S/N Ratio: 12.99
Analysis Position: [ source = BAT ]
RA: 273.086737373698 Dec: 14.2755565148965 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 273.075094741315 Dec: 14.2965464351011 [deg; J2000]
{ 18h 12m 18.0s , +14d 17' 47.6" }
+/- 1.12471480168645 [arcmin] (estimated 90% radius based on SNR)
+/- 0.517870236248799 [arcmin] (formal 1-sigma fit error)
SNR: 25.7158361797186
Angular difference between the analysis and refined position is 1.429806 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 3.47999995946884 +/- 0.819795078477236
Measured from: -0.952000021934509
to: 2.52799993753433 [s; relative to TRIGTIME]
T50: 0.815999984741211 +/- 0.13792750112767
Measured from: 0.0959999561309814
to: 0.911999940872192 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0720000267028809
to: 0.927999973297119 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.37600004673004
to: 3.22799998521805 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.259436 0.235777 0.089076 0.027720
0.015187 0.014845 0.011766 0.009414 [error]
Peak 0.144512 0.150025 0.058510 0.013671
0.008378 0.008238 0.006104 0.004522 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 4.604 -1.376 3.228
T90 3.480 -0.952 2.528
T50 0.816 0.096 0.912
Peak 1.000 -0.072 0.928
====== 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 -2.293 -0.157 0.150 - - - 6.73e-03 -6.98e-04 6.87e-04 46.570 57
CPL -2.294 N/A N/A 10000.000 N/A N/A 6.72e-03 N/A N/A 46.580 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 -2.185 -0.128 0.124 - - - 1.95e-02 -1.65e-03 1.63e-03 42.690 57
CPL -2.176 -0.136 0.115 9999.360 N/A N/A 1.97e-02 N/A N/A 42.730 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 8.38e-08 9.54e-08 7.79e-08 1.06e-07 2.96e-07 3.63e-07 erg/cm2
90%_error_low -8.70e-09 -7.22e-09 -1.10e-08 -2.68e-08 -2.52e-08 -4.10e-08 erg/cm2
90%_error_hi 8.88e-09 7.21e-09 1.13e-08 3.25e-08 2.56e-08 4.48e-08 erg/cm2
Peak flux PL 1.56e+00 1.05e+00 4.61e-01 2.80e-01 3.21e+00 3.35e+00 ph/cm2/s
90%_error_low -1.51e-01 -7.03e-02 -5.08e-02 -5.47e-02 -2.20e-01 -2.25e-01 ph/cm2/s
90%_error_hi 1.55e-01 7.03e-02 5.13e-02 6.23e-02 2.20e-01 2.25e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -8.70e-09 -7.22e-09 -1.10e-08 -2.68e-08 -2.52e-08 -4.10e-08 erg/cm2
90%_error_hi 8.88e-09 7.21e-09 1.13e-08 3.25e-08 2.56e-08 4.48e-08 erg/cm2
Peak flux CPL 1.44e+00 1.14e+00 4.52e-01 1.08e-01 3.11e+00 3.14e+00 ph/cm2/s
90%_error_low -1.76e-01 -9.60e-02 -6.08e-02 -5.72e-02 -2.31e-01 -2.42e-01 ph/cm2/s
90%_error_hi 1.77e-01 9.87e-02 5.80e-02 1.08e-01 2.30e-01 2.50e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 273.0751 14.2965 0.0075 21.1147 54.2487 0.6593838 25.716 TRIG_00517469 Foreground time interval of the image: -1.376 3.228 (delta_t = 4.604 [sec]) Background time interval of the image: -213.003 -1.376 (delta_t = 211.627 [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 -1.376 sec. to 3.228 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.29308 ( -0.157243 0.150109 ) Norm@50keV : 6.73011E-03 ( -0.000698384 0.000686575 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.57 using 59 PHA bins. # Reduced chi-squared = 0.8170 for 57 degrees of freedom # Null hypothesis probability = 8.365582e-01 Photon flux (15-150 keV) in 4.604 sec: 1.17177 ( -0.08779 0.08787 ) ph/cm2/s Energy fluence (15-150 keV) : 2.95791e-07 ( -2.51866e-08 2.55638e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.376 sec. to 3.228 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.29425 ( ) Epeak [keV] : 1.00000E+04 ( ) Norm@50keV : 6.72012E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.58 using 59 PHA bins. # Reduced chi-squared = 0.8317 for 56 degrees of freedom # Null hypothesis probability = 8.111287e-01 Photon flux (15-150 keV) in 4.604 sec: 1.15500 ( -0.09429 0.08675 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.072 sec. to 0.928 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.18487 ( -0.12825 0.123834 ) Norm@50keV : 1.95132E-02 ( -0.00164918 0.0016262 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 42.69 using 59 PHA bins. # Reduced chi-squared = 0.7489 for 57 degrees of freedom # Null hypothesis probability = 9.205282e-01 Photon flux (15-150 keV) in 1 sec: 3.20532 ( -0.21997 0.22023 ) ph/cm2/s Energy fluence (15-150 keV) : 1.83122e-07 ( -1.36609e-08 1.37754e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.072 sec. to 0.928 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.17574 ( -0.135393 0.116095 ) Epeak [keV] : 9999.36 ( ) Norm@50keV : 1.96717E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 42.72 using 59 PHA bins. # Reduced chi-squared = 0.7628 for 56 degrees of freedom # Null hypothesis probability = 9.043335e-01 Photon flux (15-150 keV) in 1 sec: 3.11480 ( -0.23051 0.2303 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 3.48 sec. Hardness ratio (energy fluence ratio) = 0.816206729402
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.792026e-07 S(50-150 keV) = 1.165882e-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 = 2.256228773123946E-01, IMY = -3.133946757620175E-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: -213.003410 -1.376000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2679 35.2157 0.0 37.4 100.7 -0.9559 -2.1 12.0 Her X-1 263.0190 -24.7624 7.5 55.0 14.9 -1.4704 -1.5 1.1 GX 1+4 268.4445 -1.6141 3.4 33.9 30.8 0.7566 3.4 10.7 SW J1753.5-0127 270.2936 -25.0673 7.6 51.8 7.7 0.7490 1.5 0.9 GX 5-1 270.2057 -25.7514 3.6 52.4 7.4 -1.5985 -3.1 5.3 GRS 1758-258 273.9347 -13.8500 0.0 40.3 11.1 -0.2765 -1.0 11.9 GX 17+2 275.9884 -30.4635 5.4 54.6 -0.8 1.1803 2.1 6.7 H1820-303 284.8979 -24.9464 8.2 47.1 -8.6 0.4412 1.4 7.7 HT1900.1-2455 288.7939 10.9539 0.6 11.5 6.8 3.0394 19.0 0.6 GRS 1915+105 299.5945 35.1993 0.5 14.8 178.2 3.5428 22.6 0.2 Cyg X-1 308.0536 40.9868 1.0 23.0 -172.1 1.9899 11.4 3.3 Cyg X-3 326.0108 38.3713 8.2 32.3 -149.0 0.2851 1.4 8.1 Cyg X-2 257.6417 1.8935 2.2 40.4 46.3 2.0177 5.2 ------ UNKNOWN 335.8714 69.2453 2.9 54.2 177.0 2.3759 4.0 ------ UNKNOWN 301.1382 -35.9161 2.6 57.6 -26.8 4.5134 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.376000 3.228000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5222 35.4194 5.3 37.2 101.1 0.1456 2.2 5.6 Her X-1 262.9398 -24.7226 7.1 55.0 15.0 0.2222 1.6 4.0 GX 1+4 268.3288 -1.4560 15.7 33.9 31.1 0.0274 0.7 2.4 SW J1753.5-0127 270.3614 -25.1565 4.3 51.8 7.6 0.1882 2.7 6.3 GX 5-1 270.4018 -25.6309 7.1 52.2 7.3 0.1193 1.6 8.6 GRS 1758-258 274.0671 -13.8998 7.9 40.3 10.9 -0.0512 -1.5 8.9 GX 17+2 276.0262 -30.3837 7.5 54.5 -0.8 0.1295 1.5 5.3 H1820-303 284.8714 -25.0297 5.1 47.1 -8.6 0.1018 2.3 11.1 HT1900.1-2455 288.6139 10.8664 4.4 11.6 7.5 -0.0540 -2.6 11.9 GRS 1915+105 299.4882 35.3784 4.5 14.9 177.6 0.0550 2.5 11.7 Cyg X-1 308.2946 41.0482 54.2 23.2 -171.8 0.0051 0.2 10.1 Cyg X-3 326.1654 38.1989 7.8 32.4 -148.7 0.0421 1.5 7.4 Cyg X-2 267.6455 12.0441 3.1 26.9 54.2 0.1185 3.8 ------ UNKNOWN 273.0751 14.2966 0.5 21.1 54.2 0.6593 25.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 172.796610 962.737000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 264.7465 -44.4502 20.3 54.1 174.1 0.8894 0.6 0.2 4U 1735-44 340.7290 -71.9245 3.0 10.8 -167.5 1.5225 3.8 ------ UNKNOWN 57.8012 -41.8056 2.9 36.3 -4.2 2.0560 3.9 ------ UNKNOWN 47.4408 -28.8214 2.2 46.4 -22.0 4.0813 5.2 ------ UNKNOWN 9.9157 -29.7487 3.9 42.4 -69.0 6.7583 3.0 ------ UNKNOWN 320.5897 -33.3836 3.0 48.0 -128.9 7.0303 3.8 ------ UNKNOWN