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: Fri May 11 18:09:20 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger824451
======================================================================
Trigger: 00824451 Segment: 000
BAT Trigger Time: 545142484.48 [s; MET]
Trigger Stop: 545142485.504 [s; MET]
UTC: 2018-04-11T12:27:43.711420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 356.82917852822 Dec: 66.7906613390428 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.13
Image Trigger?: NO
Rate S/N Ratio: 41.3037528561268 [ if not an image trigger ]
Image S/N Ratio: 18.13
Analysis Position: [ source = BAT ]
RA: 356.82917852822 Dec: 66.7906613390428 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 356.838617399312 Dec: 66.7913774559664 [deg; J2000]
{ 23h 47m 21.3s , +66d 47' 29.0" }
+/- 0.583864972386274 [arcmin] (estimated 90% radius based on SNR)
+/- 0.129710406572692 [arcmin] (formal 1-sigma fit error)
SNR: 65.6081478780531
Angular difference between the analysis and refined position is 0.227282 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 77.9759999513626 +/- 1.00622860823171
Measured from: -1.22399997711182
to: 76.7519999742508 [s; relative to TRIGTIME]
T50: 47.4359999895096 +/- 0.958081354529446
Measured from: 14.6119999885559
to: 62.0479999780655 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 51.7400000095367
to: 52.7400000095367 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.92000007629395
to: 100.824000000954 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.207478 7.241304 5.718231 1.484931
0.064025 0.068458 0.061141 0.048148 [error]
Peak 0.167794 0.267304 0.266269 0.089502
0.007795 0.009386 0.009320 0.006834 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 107.744 -6.920 100.824
T90 77.976 -1.224 76.752
T50 47.436 14.612 62.048
Peak 1.000 51.740 52.740
====== 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 -1.452 -0.030 0.030 - - - 1.18e-02 -1.86e-04 1.86e-04 40.210 57
CPL -1.350 -0.113 0.124 380.400 -173.594 -380.400 1.30e-02 -1.21e-03 1.60e-03 38.120 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 -1.116 -0.068 0.068 - - - 5.10e-02 -1.92e-03 1.92e-03 58.980 57
CPL -0.991 -0.156 0.264 454.519 -454.519 -454.519 5.82e-02 -8.52e-03 1.78e-02 58.260 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 1.55e-06 2.94e-06 4.29e-06 1.34e-05 1.22e-05 2.22e-05 erg/cm2
90%_error_low -5.43e-08 -5.98e-08 -7.38e-08 -5.46e-07 -1.89e-07 -5.66e-07 erg/cm2
90%_error_hi 5.51e-08 5.96e-08 7.37e-08 5.63e-07 1.89e-07 5.79e-07 erg/cm2
Peak flux PL 1.46e+00 1.84e+00 1.70e+00 2.74e+00 5.93e+00 7.74e+00 ph/cm2/s
90%_error_low -1.10e-01 -8.42e-02 -7.36e-02 -2.51e-01 -2.29e-01 -3.17e-01 ph/cm2/s
90%_error_hi 1.13e-01 8.38e-02 7.32e-02 2.66e-01 2.30e-01 3.20e-01 ph/cm2/s
Fluence CPL 1.50e-06 2.94e-06 4.34e-06 1.19e-05 1.21e-05 2.07e-05 erg/cm2
90%_error_low -7.59e-08 -6.07e-08 -8.93e-08 -1.55e-06 -2.05e-07 -1.55e-06 erg/cm2
90%_error_hi 7.18e-08 6.07e-08 8.98e-08 1.66e-06 2.05e-07 8.58e-07 erg/cm2
Peak flux CPL 9.45e-01 7.15e-01 3.78e-01 3.48e-01 2.18e+00 2.39e+00 ph/cm2/s
90%_error_low -1.66e-01 -1.01e-01 -2.92e-02 -5.19e-02 -2.81e-01 -2.29e-01 ph/cm2/s
90%_error_hi 1.34e-01 6.98e-02 2.04e-02 4.50e-02 1.92e-01 1.57e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 356.8386 66.7914 0.0029 19.4806 17.9168 4.6642698 65.608 TRIG_00824451 Foreground time interval of the image: -6.920 12.421 (delta_t = 19.341 [sec]) Background time interval of the image: -122.379 -6.920 (delta_t = 115.459 [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 -6.920 sec. to 100.824 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.45218 ( -0.0301049 0.0301674 ) Norm@50keV : 1.18016E-02 ( -0.000186476 0.00018625 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.21 using 59 PHA bins. # Reduced chi-squared = 0.7054 for 57 degrees of freedom # Null hypothesis probability = 9.551341e-01 Photon flux (15-150 keV) in 107.7 sec: 1.45521 ( -0.02748 0.02758 ) ph/cm2/s Energy fluence (15-150 keV) : 1.21595e-05 ( -1.88951e-07 1.88997e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.920 sec. to 100.824 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.34973 ( -0.112562 0.123592 ) Epeak [keV] : 380.400 ( -173.601 -380.407 ) Norm@50keV : 1.30235E-02 ( -0.00121075 0.00159948 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.12 using 59 PHA bins. # Reduced chi-squared = 0.6808 for 56 degrees of freedom # Null hypothesis probability = 9.676482e-01 Photon flux (15-150 keV) in 107.7 sec: 1.44127 ( -0.03156 0.03178 ) ph/cm2/s Energy fluence (15-150 keV) : 1.2091e-05 ( -2.04775e-07 2.04722e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 51.740 sec. to 52.740 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.1163 ( -0.0676807 0.067927 ) Norm@50keV : 5.10205E-02 ( -0.00192355 0.00192318 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.98 using 59 PHA bins. # Reduced chi-squared = 1.035 for 57 degrees of freedom # Null hypothesis probability = 4.028281e-01 Photon flux (15-150 keV) in 1 sec: 5.92773 ( -0.22937 0.22954 ) ph/cm2/s Energy fluence (15-150 keV) : 5.3075e-07 ( -2.24033e-08 2.24727e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 51.740 sec. to 52.740 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.990782 ( -0.156109 0.264253 ) Epeak [keV] : 454.519 ( -454.519 -454.519 ) Norm@50keV : 5.81681E-02 ( -0.00851595 0.0178348 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.26 using 59 PHA bins. # Reduced chi-squared = 1.040 for 56 degrees of freedom # Null hypothesis probability = 3.920748e-01 Photon flux (15-150 keV) in 1 sec: 2.17827 ( -0.28083 0.19236 ) ph/cm2/s Energy fluence (15-150 keV) : 1.33052e-07 ( -1.57866e-08 1.00382e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 77.976 sec. Hardness ratio (energy fluence ratio) = 1.46190824876
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.488071e-06 S(50-150 keV) = 7.671513e-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 = 3.365826677118053E-01, IMY = -1.088219953013595E-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: -122.379410 -6.920000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6191 22.0187 0.9 49.1 -163.1 4.1838 12.5 0.8 Crab 308.0378 41.0461 152.8 56.0 7.9 0.0557 0.1 6.5 Cyg X-3 326.0941 38.3984 7.4 49.9 -8.1 0.4020 1.6 5.9 Cyg X-2 163.0052 72.0361 3.1 40.7 96.8 2.1852 3.7 ------ UNKNOWN 16.2105 70.9032 2.8 13.5 37.5 0.4941 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -6.920000 12.420600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6437 22.1413 8.4 49.0 -163.2 0.2254 1.4 7.6 Crab 308.0951 40.7950 4.4 56.2 7.7 -1.1411 -2.9 9.5 Cyg X-3 326.2590 38.2514 5.0 50.0 -8.3 0.3350 2.3 5.9 Cyg X-2 356.8386 66.7914 0.2 19.5 17.9 4.6644 65.6 ------ UNKNOWN 96.2416 27.2057 2.2 50.0 -179.6 0.9464 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 53.220600 962.613200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5648 35.2302 1.5 45.2 12.2 8.9481 7.9 2.1 Cyg X-1 308.0826 41.0439 2.6 36.9 7.5 3.2410 4.5 5.6 Cyg X-3 326.1546 38.2476 11.0 33.4 -16.5 0.7141 1.0 4.5 Cyg X-2 208.5644 76.9163 3.1 35.0 104.7 4.7281 3.7 ------ UNKNOWN 301.2576 40.5903 3.4 39.9 14.3 2.7659 3.4 ------ UNKNOWN 322.6603 65.6858 3.4 13.6 38.0 1.8989 3.4 ------ UNKNOWN 356.8388 66.7803 0.7 0.0 141.4 8.8087 16.5 ------ UNKNOWN 40.8513 61.4206 2.1 19.5 -158.5 3.4519 5.4 ------ UNKNOWN 85.1646 44.0127 3.2 49.7 -172.8 5.1237 3.6 ------ UNKNOWN 88.4142 36.0789 2.8 57.8 -170.7 16.8553 4.1 ------ UNKNOWN 6.6644 27.2229 3.4 40.0 -77.0 7.5797 3.4 ------ UNKNOWN 48.1353 29.6584 2.5 48.0 -129.1 15.0004 4.6 ------ UNKNOWN