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 14:28:51 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger959917
======================================================================
Trigger: 00959917 Segment: 000
BAT Trigger Time: 605146804.736 [s; MET]
Trigger Stop: 605146805.76 [s; MET]
UTC: 2020-03-06T00:19:40.187060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 101.148811669039 Dec: -62.013026745735 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.74
Image Trigger?: NO
Rate S/N Ratio: 18.8414436814168 [ if not an image trigger ]
Image S/N Ratio: 9.74
Analysis Position: [ source = BAT ]
RA: 101.148811669039 Dec: -62.013026745735 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 101.113280670331 Dec: -62.0098538497666 [deg; J2000]
{ 06h 44m 27.2s , -62d 00' 35.5" }
+/- 0.625662759378318 [arcmin] (estimated 90% radius based on SNR)
+/- 0.173415088697049 [arcmin] (formal 1-sigma fit error)
SNR: 59.437536418324
Angular difference between the analysis and refined position is 1.018423 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 32.9639999866486 +/- 1.10926278881364
Measured from: 3.32000005245209
to: 36.2840000391006 [s; relative to TRIGTIME]
T50: 13.0119999647141 +/- 0.308933642302145
Measured from: 13.1000000238419
to: 26.1119999885559 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 20.0600000619888
to: 21.0600000619888 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.67199993133545
to: 49.9520000219345 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.550567 6.648848 4.704234 0.886392
0.062574 0.068956 0.060818 0.046516 [error]
Peak 0.206769 0.320929 0.258770 0.043138
0.010713 0.012547 0.011301 0.007522 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 53.624 -3.672 49.952
T90 32.964 3.320 36.284
T50 13.012 13.100 26.112
Peak 1.000 20.060 21.060
====== 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 -1.694 -0.031 0.031 - - - 2.10e-02 -3.60e-04 3.60e-04 90.130 57
CPL -1.066 -0.143 0.147 83.460 -6.133 8.838 4.01e-02 -5.33e-03 6.35e-03 28.250 56
=== 1-s peak 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 -1.517 -0.074 0.074 - - - 5.60e-02 -2.54e-03 2.54e-03 57.050 57
CPL -0.688 -0.328 0.354 81.865 -11.004 21.157 1.43e-01 -4.35e-02 6.86e-02 36.350 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 1.73e-06 2.82e-06 3.49e-06 8.52e-06 1.04e-05 1.66e-05 erg/cm2
90%_error_low -5.97e-08 -5.78e-08 -6.99e-08 -3.80e-07 -1.80e-07 -4.15e-07 erg/cm2
90%_error_hi 6.05e-08 5.77e-08 6.98e-08 3.91e-07 1.79e-07 4.23e-07 erg/cm2
Peak flux PL 2.34e+00 2.33e+00 1.63e+00 1.80e+00 7.02e+00 8.11e+00 ph/cm2/s
90%_error_low -1.78e-01 -1.13e-01 -9.01e-02 -1.93e-01 -3.24e-01 -3.64e-01 ph/cm2/s
90%_error_hi 1.82e-01 1.13e-01 8.97e-02 2.06e-01 3.25e-01 3.65e-01 ph/cm2/s
Fluence CPL 1.46e-06 2.90e-06 3.68e-06 4.36e-06 1.01e-05 1.24e-05 erg/cm2
90%_error_low -7.75e-08 -6.27e-08 -8.31e-08 -5.45e-07 -1.97e-07 -5.78e-07 erg/cm2
90%_error_hi 7.90e-08 6.28e-08 8.34e-08 6.43e-07 1.97e-07 6.66e-07 erg/cm2
Peak flux CPL 1.99e+00 2.50e+00 1.76e+00 8.44e-01 6.79e+00 7.09e+00 ph/cm2/s
90%_error_low -2.17e-01 -1.34e-01 -1.07e-01 -2.08e-01 -3.36e-01 -4.03e-01 ph/cm2/s
90%_error_hi 2.21e-01 1.36e-01 1.08e-01 2.76e-01 3.36e-01 4.29e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 101.1133 -62.0099 0.0032 30.9856 178.3138 5.3499839 59.438 TRIG_00959917 Foreground time interval of the image: -3.672 14.965 (delta_t = 18.637 [sec]) Background time interval of the image: -239.736 -3.672 (delta_t = 236.064 [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 -3.672 sec. to 49.952 sec. XSPEC12>exit XSPEC: quit Photon index: -1.69398 ( -0.0313667 0.0313685 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.69398 ( -0.0313685 0.0313667 ) Norm@50keV : 2.10218E-02 ( -0.000359732 0.000359718 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 53.62 sec: 2.78619 ( -0.05754 0.05777 ) ph/cm2/s Energy fluence (15-150 keV) : 1.0443e-05 ( -1.795e-07 1.7947e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.672 sec. to 49.952 sec. XSPEC: quit Photon index: -1.06626 ( -0.142501 0.146838 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.06626 ( -0.146838 0.142501 ) Epeak [keV] : 83.4595 ( -6.13276 8.83839 ) Norm@50keV : 4.00620E-02 ( -0.0053348 0.00635217 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 53.62 sec: 2.63896 ( -0.06392 0.06437 ) ph/cm2/s Energy fluence (15-150 keV) : 1.00713e-05 ( -1.97254e-07 1.97395e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 20.060 sec. to 21.060 sec. XSPEC12>exit XSPEC: quit Photon index: -1.51677 ( -0.0742351 0.0737806 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.51677 ( -0.0737806 0.0742351 ) Norm@50keV : 5.59982E-02 ( -0.00254155 0.00253827 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 7.02297 ( -0.32431 0.32465 ) ph/cm2/s Energy fluence (15-150 keV) : 5.29871e-07 ( -2.58136e-08 2.58925e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 20.060 sec. to 21.060 sec. XSPEC: quit Photon index: -0.68796 ( -0.327955 0.354237 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.687960 ( -0.354237 0.327955 ) Epeak [keV] : 81.8649 ( -11.0036 21.1571 ) Norm@50keV : 0.143086 ( -0.0434652 0.0685933 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 6.79109 ( -0.33594 0.33625 ) ph/cm2/s Energy fluence (15-150 keV) : 5.07026e-07 ( -2.7679e-08 2.76861e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 32.964 sec. Hardness ratio (energy fluence ratio) = 1.26934613036
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.362845e-06 S(50-150 keV) = 5.708617e-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 = -6.002578426180583E-01, IMY = -1.767021167549318E-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: -239.736000 -3.672000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6264 22.0380 1.4 54.4 6.0 7.7853 8.2 1.5 Crab 135.5690 -40.4382 6.8 39.0 126.6 1.4490 1.7 7.2 Vela X-1 106.9767 -2.6858 2.8 34.7 46.1 1.9711 4.2 ------ UNKNOWN 162.6208 -70.5962 2.6 54.8 167.5 6.4105 4.5 ------ UNKNOWN 87.9106 23.7184 3.0 56.0 10.9 5.3029 3.8 ------ UNKNOWN 66.5696 18.3942 2.6 54.5 -14.2 3.2971 4.4 ------ UNKNOWN 61.8275 -38.8091 2.1 21.9 -104.0 1.5805 5.6 ------ UNKNOWN 61.2259 6.7008 2.3 46.4 -27.0 2.4422 5.1 ------ UNKNOWN 51.2288 4.6857 3.3 50.6 -39.4 3.4608 3.5 ------ UNKNOWN 26.3494 -56.7883 2.9 48.0 -129.2 4.6558 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -3.672000 14.964570 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.7312 21.9961 506.7 54.4 6.1 -0.0065 -0.0 5.6 Crab 135.3699 -40.6244 22.3 38.8 126.9 -0.1031 -0.5 8.4 Vela X-1 101.1133 -62.0099 0.2 31.0 178.3 5.3498 59.4 ------ UNKNOWN 63.4481 12.9420 3.0 50.8 -20.4 0.6904 3.8 ------ UNKNOWN 24.0314 -77.5046 2.7 53.0 -155.4 1.0501 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 66.164600 453.564600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5704 -40.5747 3.0 29.7 84.2 2.2322 3.9 2.3 Vela X-1 170.3598 -60.6078 2.4 31.7 143.3 2.8158 4.8 1.6 Cen X-3 186.6985 -62.7921 5.6 36.7 154.5 1.3897 2.1 1.7 GX 301-2 151.4509 -42.8247 3.5 34.9 104.7 2.3728 3.3 ------ UNKNOWN 109.8697 -17.2573 2.3 45.2 36.0 4.1093 5.0 ------ UNKNOWN 82.6002 -8.2080 2.4 55.5 1.8 5.9998 4.8 ------ UNKNOWN 256.6637 -67.7443 2.8 49.1 -167.8 3.9722 4.0 ------ UNKNOWN 70.4981 -29.5800 2.7 38.1 -21.7 2.0527 4.2 ------ UNKNOWN 49.4327 -68.0327 2.3 21.9 -104.0 1.9949 5.0 ------ UNKNOWN