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 05:39:08 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger517489
======================================================================
Trigger: 00517489 Segment: 000
BAT Trigger Time: 353171298.816 [s; MET]
Trigger Stop: 353171299.84 [s; MET]
UTC: 2012-03-11T15:08:10.834740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 258.501429204094 Dec: -13.0597932121755 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.22
Image Trigger?: NO
Rate S/N Ratio: 16.1864140562386 [ if not an image trigger ]
Image S/N Ratio: 7.22
Analysis Position: [ source = BAT ]
RA: 258.501429204094 Dec: -13.0597932121755 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 258.551351570023 Dec: -13.0627598169576 [deg; J2000]
{ 17h 14m 12.3s , -13d 03' 45.9" }
+/- 1.27920857204349 [arcmin] (estimated 90% radius based on SNR)
+/- 0.621428473204472 [arcmin] (formal 1-sigma fit error)
SNR: 21.3966117922561
Angular difference between the analysis and refined position is 2.923273 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 29.6879999637604 +/- 6.02357236760383
Measured from: -9.87199997901917
to: 19.8159999847412 [s; relative to TRIGTIME]
T50: 12.5079999566078 +/- 1.37930995620285
Measured from: -1.72799998521805
to: 10.7799999713898 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.0440000295639
to: 10.0440000295639 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.0439999699593
to: 22.6520000100136 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.676005 0.755398 0.365582 0.073663
0.046794 0.045988 0.038850 0.036621 [error]
Peak 0.061129 0.078966 0.023972 0.001721
0.008220 0.008458 0.006757 0.006100 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 37.696 -15.044 22.652
T90 29.688 -9.872 19.816
T50 12.508 -1.728 10.780
Peak 1.000 9.044 10.044
====== 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 -1.943 -0.136 0.133 - - - 3.00e-03 -2.61e-04 2.58e-04 60.720 57
CPL -1.243 -0.594 0.712 44.923 -10.239 27.259 7.61e-03 -4.10e-03 1.21e-02 56.600 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 -2.120 -0.250 0.231 - - - 9.15e-03 -1.69e-03 1.66e-03 81.100 57
CPL 1.020 -1.554 2.107 37.016 -4.995 5.369 7.13e-01 -7.13e-01 1.24e+01 66.170 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 2.19e-07 3.08e-07 3.20e-07 6.12e-07 1.04e-06 1.46e-06 erg/cm2
90%_error_low -2.35e-08 -2.24e-08 -3.77e-08 -1.33e-07 -8.73e-08 -1.75e-07 erg/cm2
90%_error_hi 2.41e-08 2.24e-08 3.81e-08 1.57e-07 8.85e-08 1.93e-07 erg/cm2
Peak flux PL 6.85e-01 4.79e-01 2.20e-01 1.42e-01 1.45e+00 1.53e+00 ph/cm2/s
90%_error_low -1.23e-01 -6.88e-02 -5.09e-02 -5.22e-02 -2.06e-01 -2.18e-01 ph/cm2/s
90%_error_hi 1.27e-01 6.87e-02 5.26e-02 6.77e-02 2.06e-01 2.18e-01 ph/cm2/s
Fluence CPL 2.27e-07 3.10e-07 3.18e-07 7.46e-07 1.05e-06 1.50e-06 erg/cm2
90%_error_low -2.49e-08 -7.50e-09 -5.67e-08 -6.70e-07 -1.87e-07 -6.15e-07 erg/cm2
90%_error_hi 2.40e-08 5.58e-08 3.42e-08 -2.49e-07 2.48e-08 -1.38e-07 erg/cm2
Peak flux CPL 5.43e-01 6.60e-01 1.79e-01 5.60e-03 1.39e+00 1.39e+00 ph/cm2/s
90%_error_low -1.51e-01 -1.07e-01 -6.57e-02 -5.60e-03 -2.04e-01 -2.04e-01 ph/cm2/s
90%_error_hi 1.52e-01 1.10e-01 6.97e-02 2.05e-02 2.05e-01 2.05e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 258.5514 -13.0628 0.0090 30.8863 22.3375 2.2051270 21.397 TRIG_00517489 Foreground time interval of the image: -15.044 22.652 (delta_t = 37.696 [sec]) Background time interval of the image: -239.816 -15.044 (delta_t = 224.772 [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 -15.044 sec. to 22.652 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.94277 ( -0.136329 0.132806 ) Norm@50keV : 3.00077E-03 ( -0.000261146 0.000257783 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.72 using 59 PHA bins. # Reduced chi-squared = 1.065 for 57 degrees of freedom # Null hypothesis probability = 3.432357e-01 Photon flux (15-150 keV) in 37.7 sec: 0.438706 ( -0.032441 0.032467 ) ph/cm2/s Energy fluence (15-150 keV) : 1.04105e-06 ( -8.73268e-08 8.84657e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.044 sec. to 22.652 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.24279 ( -0.594505 0.712118 ) Epeak [keV] : 44.9231 ( -10.2382 27.2602 ) Norm@50keV : 7.60974E-03 ( -0.00410222 0.0121207 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.60 using 59 PHA bins. # Reduced chi-squared = 1.011 for 56 degrees of freedom # Null hypothesis probability = 4.525474e-01 Photon flux (15-150 keV) in 37.7 sec: 0.425958 ( -0.034159 0.03415 ) ph/cm2/s Energy fluence (15-150 keV) : 1.04747e-06 ( -1.86987e-07 2.4795e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 9.044 sec. to 10.044 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.11979 ( -0.249563 0.231661 ) Norm@50keV : 9.14607E-03 ( -0.00168764 0.00166096 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 81.10 using 59 PHA bins. # Reduced chi-squared = 1.423 for 57 degrees of freedom # Null hypothesis probability = 1.966278e-02 Photon flux (15-150 keV) in 1 sec: 1.45327 ( -0.2059 0.2059 ) ph/cm2/s Energy fluence (15-150 keV) : 8.51452e-08 ( -1.41269e-08 1.44871e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.044 sec. to 10.044 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.0198 ( -1.57053 2.09099 ) Epeak [keV] : 37.0162 ( -5.00493 5.35989 ) Norm@50keV : 0.712559 ( -0.737601 12.4089 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.17 using 59 PHA bins. # Reduced chi-squared = 1.182 for 56 degrees of freedom # Null hypothesis probability = 1.658287e-01 Photon flux (15-150 keV) in 1 sec: 1.38705 ( -0.20363 0.20486 ) ph/cm2/s Energy fluence (15-150 keV) : 7.30887e-08 ( -1.1503e-08 1.25658e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 29.688 sec. Hardness ratio (energy fluence ratio) = 1.04049510506
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.272269e-07 S(50-150 keV) = 5.138324e-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 = 5.532775281390634E-01, IMY = -2.273382655302791E-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: -239.816000 -15.044000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9693 -15.6322 0.7 40.8 37.9 6.1554 15.7 0.8 Sco X-1 254.6096 35.3674 5.9 26.8 139.1 -0.4796 -2.0 7.6 Her X-1 255.8701 -37.8858 4.9 54.6 10.6 1.9943 2.3 6.1 4U 1700-377 256.4067 -36.3787 5.7 53.0 10.7 -1.2861 -2.0 3.0 GX 349+2 262.9767 -24.5905 85.8 40.1 8.3 0.0385 0.1 9.5 GX 1+4 268.3781 -1.4277 2.9 16.4 10.8 0.7008 4.0 1.6 SW J1753.5-0127 270.2842 -25.0792 3.6 39.4 -2.1 0.9395 3.2 0.0 GX 5-1 270.3025 -25.7431 171.9 40.1 -2.2 0.0195 0.1 0.0 GRS 1758-258 274.1493 -13.9909 6.8 28.3 -8.3 0.3481 1.7 8.8 GX 17+2 276.0460 -30.3427 3.6 44.7 -9.7 1.0010 3.2 6.4 H1820-303 284.9327 -25.0661 4.0 41.0 -22.6 0.8302 2.9 10.4 HT1900.1-2455 288.7855 10.9316 0.9 15.7 -85.6 2.5425 12.7 1.1 GRS 1915+105 299.5782 35.2047 1.0 31.7 -142.1 2.8274 11.6 0.6 Cyg X-1 308.0980 40.9649 2.1 40.5 -144.1 1.7967 5.5 0.9 Cyg X-3 262.8928 -33.8513 28.9 49.1 5.1 0.1572 0.4 4.9 GX 354-0 236.5008 -15.4829 2.9 46.8 45.9 2.8829 3.9 ------ UNKNOWN 256.4465 55.8281 2.8 43.5 160.4 1.6538 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -15.044000 22.652000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0084 -15.6814 11.5 40.8 37.8 -0.1783 -1.0 3.0 Sco X-1 254.6352 35.4993 0.0 26.9 139.3 -0.0587 -0.5 12.8 Her X-1 255.9492 -37.7281 24.3 54.4 10.6 0.1892 0.5 7.2 4U 1700-377 256.4711 -36.4561 10.3 53.1 10.6 0.3687 1.1 2.6 GX 349+2 262.9379 -24.6112 14.0 40.1 8.3 0.0997 0.8 8.9 GX 1+4 268.4980 -1.6168 0.0 16.5 10.2 0.0982 1.2 12.6 SW J1753.5-0127 270.4262 -24.9822 15.5 39.3 -2.3 -0.0861 -0.7 9.7 GX 5-1 270.2647 -25.5888 4.2 40.0 -2.1 -0.3132 -2.7 9.5 GRS 1758-258 274.0431 -13.9864 7.8 28.3 -8.1 0.1273 1.5 3.7 GX 17+2 276.0344 -30.4574 10.9 44.8 -9.7 -0.1410 -1.1 7.8 H1820-303 285.1272 -25.0463 3.9 41.0 -22.8 0.3594 2.9 9.0 HT1900.1-2455 288.8144 11.0639 8.4 15.7 -86.1 0.1182 1.4 7.2 GRS 1915+105 299.5112 35.1829 4.8 31.7 -142.1 0.2434 2.4 4.0 Cyg X-1 307.9600 41.0211 41.6 40.4 -144.3 0.0387 0.3 7.9 Cyg X-3 263.0393 -33.7703 17.6 49.0 5.0 0.1183 0.7 4.6 GX 354-0 231.4212 41.9588 1.9 45.3 129.9 2.1840 6.0 ------ UNKNOWN 258.5514 -13.0628 0.5 30.9 22.3 2.2048 21.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 327.084600 482.219300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 64.1892 -12.8792 2.3 25.0 110.7 3.0518 5.1 ------ UNKNOWN 58.9263 23.3520 2.6 33.7 32.7 3.0313 4.4 ------ UNKNOWN 48.3766 6.0367 2.5 13.7 37.4 2.1459 4.7 ------ UNKNOWN 3.5471 39.6226 2.5 55.9 -33.1 12.2697 4.6 ------ UNKNOWN