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 Jul 15 18:59:25 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger904394
======================================================================
Trigger: 00904394 Segment: 000
BAT Trigger Time: 579943562.368 [s; MET]
Trigger Stop: 579943562.88 [s; MET]
UTC: 2019-05-19T07:25:39.438900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 114.764434750018 Dec: -38.8241293159876 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.76
Image Trigger?: NO
Rate S/N Ratio: 45.0222167379617 [ if not an image trigger ]
Image S/N Ratio: 6.76
Analysis Position: [ source = BAT ]
RA: 114.764434750018 Dec: -38.8241293159876 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 114.756667817351 Dec: -38.8137924943174 [deg; J2000]
{ 07h 39m 01.6s , -38d 48' 49.7" }
+/- 1.66512971456172 [arcmin] (estimated 90% radius based on SNR)
+/- 0.672961569435034 [arcmin] (formal 1-sigma fit error)
SNR: 14.6812824118911
Angular difference between the analysis and refined position is 0.718674 arcmin
Partial Coding Fraction: 0.08105469 [ including projection effects ]
Duration
T90: 44.4800000190735 +/- 2.58586929632961
Measured from: -41.6720000505447
to: 2.80799996852875 [s; relative to TRIGTIME]
T50: 26.7200000286102 +/- 1.3555691946078
Measured from: -27.0160000324249
to: -0.296000003814697 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.212000012397766
to: 0.787999987602234 [s; relative to TRIGTIME]
Total Fluence
Measured from: -52.472000002861
to: 5.62399995326996 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.136554 11.021014 7.686798 1.659554
0.262051 0.288001 0.256864 0.179598 [error]
Peak 0.484875 0.964724 0.858259 0.305616
0.054709 0.072380 0.071790 0.043408 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 58.096 -52.472 5.624
T90 44.480 -41.672 2.808
T50 26.720 -27.016 -0.296
Peak 1.000 -0.212 0.788
====== 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 -1.696 -0.059 0.058 - - - 3.40e-02 -1.12e-03 1.12e-03 80.390 57
CPL -1.281 -0.229 0.243 90.950 -16.182 46.794 5.38e-02 -1.18e-02 1.61e-02 70.440 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 -1.361 -0.120 0.119 - - - 1.70e-01 -1.42e-02 1.41e-02 51.190 57
CPL -0.342 -0.521 0.587 88.118 -15.491 36.966 5.35e-01 -2.32e-01 4.71e-01 39.030 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 3.03e-06 4.94e-06 6.10e-06 1.49e-05 1.83e-05 2.90e-05 erg/cm2
90%_error_low -1.76e-07 -1.74e-07 -2.58e-07 -1.32e-06 -6.25e-07 -1.51e-06 erg/cm2
90%_error_hi 1.80e-07 1.74e-07 2.58e-07 1.40e-06 6.27e-07 1.57e-06 erg/cm2
Peak flux PL 7.66e-04 1.41e-02 9.12e-02 1.43e+01 7.51e-01 1.37e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 2.78e-06 5.11e-06 6.30e-06 8.74e-06 1.78e-05 2.29e-05 erg/cm2
90%_error_low -2.17e-07 -1.98e-07 -2.87e-07 -2.10e-06 -6.77e-07 -2.19e-06 erg/cm2
90%_error_hi 2.21e-07 2.00e-07 2.90e-07 2.89e-06 6.76e-07 2.92e-06 erg/cm2
Peak flux CPL 4.20e+00 2.99e+00 1.48e+00 1.24e+00 9.19e+00 9.89e+00 ph/cm2/s
90%_error_low -1.21e+00 -8.34e-01 -4.49e-01 -3.32e-01 -2.55e+00 -2.60e+00 ph/cm2/s
90%_error_hi 9.35e-01 5.81e-01 2.62e-01 4.47e-01 1.66e+00 1.62e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 114.7567 -38.8138 0.0131 39.9351 128.7765 24.1439625 14.681 TRIG_00904394 Foreground time interval of the image: -28.267 5.624 (delta_t = 33.891 [sec]) Background time interval of the image:
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 -52.472 sec. to 5.624 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.69573 ( -0.0585692 0.0582495 ) Norm@50keV : 3.39866E-02 ( -0.00112442 0.00112323 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 80.39 using 59 PHA bins. # Reduced chi-squared = 1.410 for 57 degrees of freedom # Null hypothesis probability = 2.233632e-02 Photon flux (15-150 keV) in 58.1 sec: 4.50728 ( -0.15964 0.16006 ) ph/cm2/s Energy fluence (15-150 keV) : 1.82914e-05 ( -6.25476e-07 6.27085e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -52.472 sec. to 5.624 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.28087 ( -0.2293 0.242533 ) Epeak [keV] : 90.9497 ( -16.1818 46.794 ) Norm@50keV : 5.38375E-02 ( -0.0118008 0.0161153 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 70.44 using 59 PHA bins. # Reduced chi-squared = 1.258 for 56 degrees of freedom # Null hypothesis probability = 9.277030e-02 Photon flux (15-150 keV) in 58.1 sec: 4.39086 ( -0.17036 0.17094 ) ph/cm2/s Energy fluence (15-150 keV) : 1.78421e-05 ( -6.77405e-07 6.75558e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.212 sec. to 0.788 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.36135 ( -0.119852 0.118825 ) Norm@50keV : 0.170303 ( -0.0141603 0.0141507 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.19 using 59 PHA bins. # Reduced chi-squared = 0.8980 for 57 degrees of freedom # Null hypothesis probability = 6.919004e-01 Photon flux (15-150 keV) in 1 sec: 0.751056 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.65932e-06 ( -1.48266e-07 1.48728e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.212 sec. to 0.788 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.342177 ( -0.521315 0.587335 ) Epeak [keV] : 88.1182 ( -15.4914 36.9655 ) Norm@50keV : 0.534778 ( -0.231675 0.471308 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.03 using 59 PHA bins. # Reduced chi-squared = 0.6970 for 56 degrees of freedom # Null hypothesis probability = 9.587753e-01 Photon flux (15-150 keV) in 1 sec: 9.19469 ( -2.55237 1.65981 ) ph/cm2/s Energy fluence (15-150 keV) : 6.31364e-07 ( -1.71499e-07 1.57187e-07 ) 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 = -5.243064978599906E-01, IMY = -6.526537511321755E-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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -28.267400 5.624000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6374 22.0255 1.4 29.3 -75.9 1.3225 8.2 0.7 Crab 114.7566 -38.8138 0.8 39.9 128.8 24.1455 14.7 ------ UNKNOWN 71.7200 -31.5376 3.0 43.0 -176.4 1.2400 3.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 74.132590 962.712000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.7477 -40.4994 7.6 16.2 67.8 2.4832 1.5 10.5 Vela X-1 30.3347 -56.2408 3.0 55.7 -172.9 30.6886 3.9 ------ UNKNOWN 114.6328 -10.8788 2.5 27.9 -35.2 8.4762 4.6 ------ UNKNOWN