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 15:16:19 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger945521
======================================================================
Trigger: 00945521 Segment: 000
BAT Trigger Time: 598653577.28 [s; MET]
Trigger Stop: 598653578.304 [s; MET]
UTC: 2019-12-21T20:39:13.151900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 154.832295571442 Dec: -38.141432610349 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.67
Image Trigger?: NO
Rate S/N Ratio: 145.168867185771 [ if not an image trigger ]
Image S/N Ratio: 11.67
Analysis Position: [ source = BAT ]
RA: 154.832295571442 Dec: -38.141432610349 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 154.830581173243 Dec: -38.1519729313983 [deg; J2000]
{ 10h 19m 19.3s , -38d 09' 07.1" }
+/- 1.14588350232199 [arcmin] (estimated 90% radius based on SNR)
+/- 0.321593617023232 [arcmin] (formal 1-sigma fit error)
SNR: 25.0398659096873
Angular difference between the analysis and refined position is 0.637572 arcmin
Partial Coding Fraction: 0.1201172 [ including projection effects ]
Duration
T90: 48 +/- 16
Measured from: -15.2799999713898
to: 32.7200000286102 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: -15.2799999713898
to: 0.720000028610229 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.22000002861023
to: 9.22000002861023 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.2799999713898
to: 96.7200000286102 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.103132 9.441755 8.911206 2.940658
0.180456 0.203742 0.195085 0.156653 [error]
Peak 0.149470 0.246612 0.176597 0.057910
0.026709 0.030842 0.026766 0.020408 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 112.000 -15.280 96.720
T90 48.000 -15.280 32.720
T50 16.000 -15.280 0.720
Peak 1.000 8.220 9.220
====== 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 -1.232 -0.046 0.046 - - - 1.70e-02 -4.37e-04 4.37e-04 43.770 57
CPL -0.993 -0.181 0.188 245.349 -82.224 514.241 2.17e-02 -3.53e-03 4.39e-03 38.630 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 -1.766 -0.243 0.231 - - - 3.56e-02 -5.82e-03 5.73e-03 88.040 57
CPL -0.521 -1.140 1.406 57.343 -12.406 86.116 1.62e-01 -1.62e-01 6.81e-01 84.590 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 1.90e-06 4.11e-06 7.00e-06 2.74e-05 1.92e-05 4.04e-05 erg/cm2
90%_error_low -1.01e-07 -1.30e-07 -1.99e-07 -1.77e-06 -5.10e-07 -1.86e-06 erg/cm2
90%_error_hi 1.03e-07 1.29e-07 1.99e-07 1.85e-06 5.10e-07 1.93e-06 erg/cm2
Peak flux PL 1.89e+00 1.63e+00 9.58e-01 8.44e-01 4.85e+00 5.32e+00 ph/cm2/s
90%_error_low -4.14e-01 -2.51e-01 -1.94e-01 -2.86e-01 -7.43e-01 -8.04e-01 ph/cm2/s
90%_error_hi 4.34e-01 2.50e-01 1.91e-01 3.50e-01 7.43e-01 8.05e-01 ph/cm2/s
Fluence CPL 1.78e-06 4.16e-06 7.18e-06 2.04e-05 1.90e-05 3.35e-05 erg/cm2
90%_error_low -1.30e-07 -1.38e-07 -2.40e-07 -3.97e-06 -5.38e-07 -3.95e-06 erg/cm2
90%_error_hi 1.32e-07 1.38e-07 2.42e-07 5.12e-06 5.37e-07 5.07e-06 erg/cm2
Peak flux CPL 1.90e+00 1.41e+00 7.18e-01 6.27e-01 4.31e+00 4.64e+00 ph/cm2/s
90%_error_low N/A -3.72e-01 -2.00e-01 -5.27e-01 -1.09e+00 -1.29e+00 ph/cm2/s
90%_error_hi N/A 2.45e-01 1.95e-01 1.46e-01 6.94e-01 1.19e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 154.8306 -38.1520 0.0076 39.7720 119.3195 24.4156116 25.040 TRIG_00945521 Foreground time interval of the image: -15.280 14.821 (delta_t = 30.101 [sec]) Background time interval of the image: -239.280 -15.280 (delta_t = 224.000 [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 -15.280 sec. to 96.720 sec. XSPEC12>exit XSPEC: quit Photon index: -1.23195 ( -0.0459914 0.0461953 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.23195 ( -0.0461953 0.0459914 ) Norm@50keV : 1.70440E-02 ( -0.000437285 0.000436964 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 112 sec: 2.01009 ( -0.05571 0.05584 ) ph/cm2/s Energy fluence (15-150 keV) : 1.91989e-05 ( -5.09844e-07 5.10228e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.280 sec. to 96.720 sec. XSPEC: quit Photon index: -0.99319 ( -0.180811 0.188447 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.993190 ( -0.188447 0.180811 ) Epeak [keV] : 245.349 ( -82.2239 514.241 ) Norm@50keV : 2.16774E-02 ( -0.00352686 0.00438649 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 112 sec: 1.98230 ( -0.05912 0.05928 ) ph/cm2/s Energy fluence (15-150 keV) : 1.89893e-05 ( -5.37919e-07 5.36499e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.220 sec. to 9.220 sec. XSPEC12>exit XSPEC: quit Photon index: -1.76585 ( -0.242967 0.230927 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.76585 ( -0.230927 0.242967 ) Norm@50keV : 3.56247E-02 ( -0.00582387 0.0057321 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 4.84575 ( -0.74278 0.74343 ) ph/cm2/s Energy fluence (15-150 keV) : 3.28488e-07 ( -5.45073e-08 5.48483e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.220 sec. to 9.220 sec. XSPEC: quit Photon index: -0.521373 ( -1.14 1.40567 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.521373 ( -1.40567 1.14 ) Epeak [keV] : 57.3426 ( -12.4055 86.1173 ) Norm@50keV : 0.161939 ( -0.161955 0.680768 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 4.30882 ( -1.089 0.69372 ) ph/cm2/s Energy fluence (15-150 keV) : 3.15762e-07 ( -5.49485e-08 5.60128e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 48.0 sec. Hardness ratio (energy fluence ratio) = 1.70298189807
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.006618e-06 S(50-150 keV) = 1.3192182e-05
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 = -4.075790955843092E-01, IMY = -7.257198588464503E-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: -239.280000 -15.280000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3416 -60.6632 1.9 17.2 97.5 1.8289 6.0 2.5 Cen X-3 186.6993 -62.7729 1.7 9.2 99.5 1.9368 6.9 1.2 GX 301-2 255.7834 -37.9029 332.6 38.5 -92.1 -0.0293 -0.0 10.2 4U 1700-377 256.5086 -36.5322 7.5 40.0 -92.5 1.7290 1.5 7.4 GX 349+2 264.7375 -44.4476 8.4 37.2 -76.9 0.8631 1.4 0.3 4U 1735-44 180.1652 -24.7010 2.5 42.5 158.1 2.4472 4.5 ------ UNKNOWN 154.6428 -70.9801 3.0 20.9 61.7 1.2186 3.9 ------ UNKNOWN 20.2088 -72.2302 2.8 44.4 12.5 1.9482 4.2 ------ UNKNOWN 258.7018 -36.6429 2.2 40.8 -90.1 6.4912 5.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -15.280000 14.820590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.5513 -60.5514 129.1 17.1 98.0 0.0193 0.1 8.2 Cen X-3 186.6655 -62.7773 78.1 9.2 99.5 0.0264 0.1 0.5 GX 301-2 255.8533 -37.7898 12.4 38.6 -92.1 0.3462 0.9 7.1 4U 1700-377 256.4538 -36.6005 23.6 39.9 -92.5 0.2252 0.5 10.7 GX 349+2 264.6661 -44.5894 208.7 37.0 -76.9 0.0135 0.1 9.0 4U 1735-44 154.8306 -38.1520 0.5 39.8 119.3 24.4156 25.0 ------ UNKNOWN 95.7438 -70.4472 3.9 38.1 45.9 1.4941 3.0 ------ UNKNOWN 174.4749 -30.4895 3.0 38.8 147.7 1.5072 3.8 ------ UNKNOWN 223.3407 -46.7797 2.4 18.8 -127.9 0.6795 4.8 ------ UNKNOWN 257.7558 -51.7384 3.0 28.7 -74.1 0.5414 3.9 ------ UNKNOWN 248.1429 -46.3982 3.0 28.3 -91.5 0.5240 3.8 ------ UNKNOWN 257.3732 -36.1131 2.9 40.7 -91.9 1.7777 3.9 ------ UNKNOWN 253.5533 -33.7726 2.8 41.1 -97.9 1.7494 4.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 73.020590 962.857900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5102 -40.5734 2.1 15.1 41.5 3.9132 5.5 1.4 Vela X-1 170.2959 -60.6176 1.1 24.5 -51.7 8.3520 10.2 0.7 Cen X-3 186.6537 -62.7678 0.9 31.2 -61.0 12.3720 12.9 0.2 GX 301-2 141.6316 -23.4796 2.5 18.5 105.4 4.1437 4.6 ------ UNKNOWN 188.0697 -2.6167 4.2 46.7 -164.5 4.3044 2.8 ------ UNKNOWN 170.6473 -67.1294 2.4 30.3 -45.4 4.0859 4.9 ------ UNKNOWN 176.8721 -69.1982 2.4 33.2 -47.3 4.2223 4.9 ------ UNKNOWN 207.0744 -20.7444 2.7 48.0 -129.1 12.7414 4.3 ------ UNKNOWN 207.8071 -27.0007 3.0 45.4 -121.2 10.0345 3.9 ------ UNKNOWN 209.8116 -42.8407 3.0 41.3 -98.7 10.9373 3.8 ------ UNKNOWN