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 21:36:52 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger458059
======================================================================
Trigger: 00458059 Segment: 000
BAT Trigger Time: 333336647.744 [s; MET]
Trigger Stop: 333336648.768 [s; MET]
UTC: 2011-07-26T01:30:40.549800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 286.750618690009 Dec: 56.0532972548459 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.6
Image Trigger?: NO
Rate S/N Ratio: 10.6770782520313 [ if not an image trigger ]
Image S/N Ratio: 8.6
Analysis Position: [ source = BAT ]
RA: 286.750618690009 Dec: 56.0532972548459 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 286.713005323196 Dec: 56.069723645654 [deg; J2000]
{ 19h 06m 51.1s , +56d 04' 11.0" }
+/- 1.66426926961846 [arcmin] (estimated 90% radius based on SNR)
+/- 0.693414734794835 [arcmin] (formal 1-sigma fit error)
SNR: 14.6921270122615
Angular difference between the analysis and refined position is 1.599662 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 5.15599995851517 +/- 1.10730662075066
Measured from: -0.580000042915344
to: 4.57599991559982 [s; relative to TRIGTIME]
T50: 2.05599999427795 +/- 0.584564735156271
Measured from: 0.655999958515167
to: 2.71199995279312 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.611999988555908
to: 1.61199998855591 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.864000022411346
to: 5.01199996471405 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.150572 0.202839 0.103417 -0.010569
0.015323 0.015973 0.014201 0.013447 [error]
Peak 0.031689 0.064982 0.031691 -0.006386
0.006508 0.006909 0.005850 0.005530 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 5.876 -0.864 5.012
T90 5.156 -0.580 4.576
T50 2.056 0.656 2.712
Peak 1.000 0.612 1.612
====== 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: 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 -1.859 -0.182 0.174 - - - 4.54e-03 -5.55e-04 5.46e-04 87.710 57
CPL -0.638 -0.779 0.956 46.533 -8.109 15.556 2.29e-02 -1.46e-02 5.96e-02 79.850 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 -1.646 -0.244 0.237 - - - 7.73e-03 -1.30e-03 1.28e-03 75.330 57
CPL 0.324 -1.216 1.734 49.985 -8.971 18.662 1.02e-01 -1.02e-01 9.46e-01 66.310 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 4.77e-08 7.05e-08 7.78e-08 1.61e-07 2.45e-07 3.57e-07 erg/cm2
90%_error_low -6.47e-09 -6.96e-09 -1.27e-08 -4.68e-08 -2.96e-08 -6.20e-08 erg/cm2
90%_error_hi 6.62e-09 6.96e-09 1.30e-08 5.82e-08 3.03e-08 7.10e-08 erg/cm2
Peak flux PL 3.66e-01 3.38e-01 2.16e-01 2.12e-01 1.01e+00 1.13e+00 ph/cm2/s
90%_error_low -7.71e-02 -5.07e-02 -4.53e-02 -7.43e-02 -1.50e-01 -1.75e-01 ph/cm2/s
90%_error_hi 8.03e-02 5.06e-02 4.59e-02 9.56e-02 1.50e-01 1.77e-01 ph/cm2/s
Fluence CPL 4.28e-08 8.11e-08 7.32e-08 2.79e-08 2.18e-07 2.25e-07 erg/cm2
90%_error_low -7.41e-09 -9.57e-09 -1.63e-08 -1.88e-08 -3.03e-08 -3.59e-08 erg/cm2
90%_error_hi 7.43e-09 9.90e-09 1.55e-08 4.98e-08 3.29e-08 5.76e-08 erg/cm2
Peak flux CPL 3.00e-01 4.20e-01 2.12e-01 2.79e-02 9.56e-01 9.59e-01 ph/cm2/s
90%_error_low -8.92e-02 -7.17e-02 -6.33e-02 -2.79e-02 -1.50e-01 -1.52e-01 ph/cm2/s
90%_error_hi 9.17e-02 7.68e-02 5.82e-02 6.31e-02 1.51e-01 1.56e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 286.7130 56.0697 0.0131 9.5266 -163.6028 0.4344129 14.692 TRIG_00458059 Foreground time interval of the image: -0.864 5.012 (delta_t = 5.876 [sec]) Background time interval of the image: -239.744 -0.864 (delta_t = 238.880 [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 -0.864 sec. to 5.012 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.85879 ( -0.182257 0.173682 ) Norm@50keV : 4.53612E-03 ( -0.000555106 0.000545827 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 87.71 using 59 PHA bins. # Reduced chi-squared = 1.539 for 57 degrees of freedom # Null hypothesis probability = 5.559035e-03 Photon flux (15-150 keV) in 5.876 sec: 0.639925 ( -0.062785 0.062785 ) ph/cm2/s Energy fluence (15-150 keV) : 2.45099e-07 ( -2.95969e-08 3.03122e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.864 sec. to 5.012 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.63779 ( -0.779242 0.955678 ) Epeak [keV] : 46.5334 ( -8.10926 15.5559 ) Norm@50keV : 2.28581E-02 ( -0.0145744 0.0595655 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 79.85 using 59 PHA bins. # Reduced chi-squared = 1.426 for 56 degrees of freedom # Null hypothesis probability = 1.987724e-02 Photon flux (15-150 keV) in 5.876 sec: 0.612740 ( -0.064017 0.064339 ) ph/cm2/s Energy fluence (15-150 keV) : 2.17782e-07 ( -3.03424e-08 3.29337e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.612 sec. to 1.612 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.64607 ( -0.244939 0.236566 ) Norm@50keV : 7.72695E-03 ( -0.00129603 0.00127831 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 75.33 using 59 PHA bins. # Reduced chi-squared = 1.322 for 57 degrees of freedom # Null hypothesis probability = 5.242713e-02 Photon flux (15-150 keV) in 1 sec: 1.00768 ( -0.150367 0.15037 ) ph/cm2/s Energy fluence (15-150 keV) : 7.19118e-08 ( -1.26466e-08 1.29965e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.612 sec. to 1.612 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.324333 ( -1.21814 1.73198 ) Epeak [keV] : 49.9851 ( -8.95647 18.6769 ) Norm@50keV : 0.102287 ( -0.102599 0.945403 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.31 using 59 PHA bins. # Reduced chi-squared = 1.184 for 56 degrees of freedom # Null hypothesis probability = 1.630520e-01 Photon flux (15-150 keV) in 1 sec: 0.956325 ( -0.15 0.151105 ) ph/cm2/s Energy fluence (15-150 keV) : 6.07337e-08 ( -1.18088e-08 1.34127e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = -1.609943794173015E-01, IMY = 4.737474650099357E-02
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: -239.744000 -0.864000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5628 35.3538 10.3 39.0 178.8 -0.4420 -1.1 5.2 Her X-1 299.5881 35.1897 0.4 21.2 109.5 9.2091 29.4 0.7 Cyg X-1 308.1466 40.8778 2.9 15.5 87.6 1.0248 3.9 4.8 Cyg X-3 326.1796 38.2292 6.6 23.3 50.7 0.5240 1.8 5.6 Cyg X-2 5.9879 54.7754 3.7 34.0 -14.6 0.9265 3.1 ------ UNKNOWN 224.1782 31.5250 3.4 58.7 -159.1 6.6531 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.864000 5.012000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3950 35.3527 4.1 39.1 179.0 -0.1262 -2.8 3.1 Her X-1 299.6568 35.3126 7.9 21.0 109.3 -0.0574 -1.5 7.4 Cyg X-1 308.2319 41.0237 4.8 15.4 87.2 -0.0863 -2.4 7.0 Cyg X-3 325.9986 38.3773 3.4 23.1 50.8 0.1288 3.4 8.8 Cyg X-2 286.7130 56.0697 0.8 9.5 -163.6 0.4344 14.7 ------ UNKNOWN 19.0693 44.5821 2.2 46.8 -9.4 0.2953 5.2 ------ UNKNOWN 330.7708 70.2832 2.6 18.3 -51.1 0.1378 4.5 ------ UNKNOWN 71.2681 76.4801 2.6 43.2 -64.5 0.4866 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 42.156600 742.956620 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6029 35.2711 8.9 30.1 167.8 0.9609 1.3 8.3 Her X-1 299.5840 35.1941 0.3 22.6 79.7 28.6117 39.4 0.5 Cyg X-1 308.1558 40.9349 1.9 20.5 56.2 3.7929 6.1 2.3 Cyg X-3 326.2462 38.3649 7.8 31.5 35.2 1.1962 1.5 4.4 Cyg X-2 205.4748 37.3152 3.8 55.2 -145.3 16.5905 3.0 ------ UNKNOWN 197.5844 57.3915 3.2 45.3 -121.4 8.7783 3.6 ------ UNKNOWN