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 v2.47
Process Start Time: Mon May 18 14:38:53 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger958592
======================================================================
Trigger: 00958592 Segment: 000
BAT Trigger Time: 604480832.512 [s; MET]
Trigger Stop: 604480833.536 [s; MET]
UTC: 2020-02-27T07:20:08.006260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 56.4359448856047 Dec: 9.49094958213362 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.47
Image Trigger?: NO
Rate S/N Ratio: 13.7840487520902 [ if not an image trigger ]
Image S/N Ratio: 10.47
Analysis Position: [ source = BAT ]
RA: 56.4359448856047 Dec: 9.49094958213362 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 56.4329403328802 Dec: 9.48989290227121 [deg; J2000]
{ 03h 45m 43.9s , +09d 29' 23.6" }
+/- 0.666045515150351 [arcmin] (estimated 90% radius based on SNR)
+/- 0.302641512630049 [arcmin] (formal 1-sigma fit error)
SNR: 54.3570217938046
Angular difference between the analysis and refined position is 0.188771 arcmin
Partial Coding Fraction: 0.4648438 [ including projection effects ]
Duration
T90: 30.3279999494553 +/- 9.20228228056807
Measured from: 2.33600008487701
to: 32.6640000343323 [s; relative to TRIGTIME]
T50: 8.88800001144409 +/- 0.408333133201301
Measured from: 7.7039999961853
to: 16.5920000076294 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.5440000295639
to: 9.5440000295639 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.495999932289124
to: 87.7319999933243 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.401585 3.841296 3.231611 0.858059
0.074765 0.081080 0.072234 0.056599 [error]
Peak 0.145125 0.205815 0.249766 0.082394
0.012499 0.014156 0.014253 0.009665 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 88.228 -0.496 87.732
T90 30.328 2.336 32.664
T50 8.888 7.704 16.592
Peak 1.000 8.544 9.544
====== 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 -1.449 -0.047 0.047 - - - 8.46e-03 -2.16e-04 2.16e-04 62.800 57
CPL -1.160 -0.187 0.195 166.787 -44.623 185.998 1.14e-02 -1.92e-03 2.42e-03 55.740 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 -1.246 -0.112 0.112 - - - 4.77e-02 -3.07e-03 3.07e-03 44.380 57
CPL -1.145 -0.156 0.446 489.958 -489.958 -489.958 5.29e-02 -1.34e-02 2.97e-02 44.210 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 9.09e-07 1.72e-06 2.52e-06 7.90e-06 7.15e-06 1.31e-05 erg/cm2
90%_error_low -4.72e-08 -5.32e-08 -7.47e-08 -5.23e-07 -1.88e-07 -5.60e-07 erg/cm2
90%_error_hi 4.82e-08 5.30e-08 7.45e-08 5.47e-07 1.88e-07 5.78e-07 erg/cm2
Peak flux PL 1.54e+00 1.80e+00 1.52e+00 2.17e+00 5.64e+00 7.03e+00 ph/cm2/s
90%_error_low -1.91e-01 -1.40e-01 -1.12e-01 -3.21e-01 -3.80e-01 -4.65e-01 ph/cm2/s
90%_error_hi 1.99e-01 1.38e-01 1.11e-01 3.52e-01 3.81e-01 4.67e-01 ph/cm2/s
Fluence CPL 8.42e-07 1.75e-06 2.60e-06 5.59e-06 7.04e-06 1.08e-05 erg/cm2
90%_error_low -6.15e-08 -5.66e-08 -8.87e-08 -1.07e-06 -2.00e-07 -1.08e-06 erg/cm2
90%_error_hi 6.28e-08 5.68e-08 8.94e-08 1.39e-06 1.99e-07 1.38e-06 erg/cm2
Peak flux CPL 1.50e+00 1.81e+00 1.54e+00 1.96e+00 5.61e+00 6.82e+00 ph/cm2/s
90%_error_low -2.45e-01 -1.43e-01 -1.27e-01 -6.59e-01 -3.91e-01 -7.91e-01 ph/cm2/s
90%_error_hi 2.02e-01 1.48e-01 1.41e-01 3.64e-01 3.91e-01 6.39e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 56.4329 9.4899 0.0035 42.2337 -22.8252 5.7524282 54.357 TRIG_00958592 Foreground time interval of the image: -0.496 12.189 (delta_t = 12.685 [sec]) Background time interval of the image: -239.512 -0.496 (delta_t = 239.016 [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 -0.496 sec. to 87.732 sec. XSPEC12>exit XSPEC: quit Photon index: -1.44912 ( -0.046623 0.0466994 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.44912 ( -0.0466994 0.046623 ) Norm@50keV : 8.46144E-03 ( -0.000216413 0.00021637 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 88.23 sec: 1.04255 ( -0.03014 0.03024 ) ph/cm2/s Energy fluence (15-150 keV) : 7.14606e-06 ( -1.87707e-07 1.87696e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.496 sec. to 87.732 sec. XSPEC: quit Photon index: -1.16034 ( -0.187185 0.195166 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.16034 ( -0.195166 0.187185 ) Epeak [keV] : 166.787 ( -44.6231 185.998 ) Norm@50keV : 1.13510E-02 ( -0.00192299 0.00241714 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 88.23 sec: 1.02148 ( -0.032686 0.03283 ) ph/cm2/s Energy fluence (15-150 keV) : 7.04493e-06 ( -1.99882e-07 1.99203e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.544 sec. to 9.544 sec. XSPEC12>exit XSPEC: quit Photon index: -1.24552 ( -0.111678 0.112096 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.24552 ( -0.112096 0.111678 ) Norm@50keV : 4.76973E-02 ( -0.00306929 0.0030685 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 5.63726 ( -0.38047 0.38139 ) ph/cm2/s Energy fluence (15-150 keV) : 4.77969e-07 ( -3.31944e-08 3.33006e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.544 sec. to 9.544 sec. XSPEC: quit Photon index: -1.14502 ( -0.156135 0.446119 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.14502 ( -0.446119 0.156135 ) Epeak [keV] : 489.958 ( -489.939 -489.939 ) Norm@50keV : 5.29438E-02 ( -0.0133553 0.0297316 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 5.61476 ( -0.39136 0.39148 ) ph/cm2/s Energy fluence (15-150 keV) : 4.76508e-07 ( -3.394e-08 3.28698e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 30.328 sec. Hardness ratio (energy fluence ratio) = 1.4863805507
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.590681e-06 S(50-150 keV) = 4.454198e-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 = 8.367282578017127E-01, IMY = 3.521618226826512E-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: -239.512000 -0.496000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6278 22.0228 0.8 47.6 18.0 8.7800 15.3 0.6 Crab 135.5599 -40.4912 4.6 47.5 137.0 2.6648 2.5 4.1 Vela X-1 114.5740 -0.2997 2.3 41.2 72.0 4.7828 5.1 ------ UNKNOWN 108.8312 -19.8679 3.2 26.4 98.0 1.3134 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.496000 12.188600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.7605 22.0082 6.4 47.6 18.1 -0.2985 -1.8 7.1 Crab 135.4717 -40.3836 6.8 47.5 136.9 -0.4467 -1.7 10.6 Vela X-1 101.2947 12.4514 2.9 42.9 44.6 0.6398 4.0 ------ UNKNOWN 59.4592 21.3000 2.4 51.1 -11.4 0.7304 4.8 ------ UNKNOWN 56.4330 9.4899 0.2 42.2 -22.8 5.7514 54.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 71.388600 962.557200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6453 22.0246 0.4 29.0 72.1 34.4727 29.2 0.9 Crab 42.2419 -45.5017 3.6 56.5 -157.1 14.3821 3.2 ------ UNKNOWN 34.7670 -27.2918 3.6 42.4 -139.9 4.6566 3.2 ------ UNKNOWN 24.1345 -26.8574 2.5 48.0 -129.1 17.5300 4.7 ------ UNKNOWN