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: Thu Apr 11 00:03:29 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger893808
======================================================================
Trigger: 00893808 Segment: 000
BAT Trigger Time: 574737299.2 [s; MET]
Trigger Stop: 574737307.392 [s; MET]
UTC: 2019-03-20T01:14:36.601140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 117.8105857429 Dec: -45.8897753307729 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.63
Image Trigger?: NO
Rate S/N Ratio: 11.4455231422596 [ if not an image trigger ]
Image S/N Ratio: 7.63
Analysis Position: [ source = BAT ]
RA: 117.8105857429 Dec: -45.8897753307729 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 117.826815025873 Dec: -45.8779326989759 [deg; J2000]
{ 07h 51m 18.4s , -45d 52' 40.6" }
+/- 1.90802222886645 [arcmin] (estimated 90% radius based on SNR)
+/- 0.781744084583066 [arcmin] (formal 1-sigma fit error)
SNR: 12.0860645250273
Angular difference between the analysis and refined position is 0.982023 arcmin
Partial Coding Fraction: 0.296875 [ including projection effects ]
Duration
T90: 63 +/- 12.0830459735946
Measured from: -23.2000000476837
to: 39.7999999523163 [s; relative to TRIGTIME]
T50: 24 +/- 9.8488578017961
Measured from: -12.2000000476837
to: 11.7999999523163 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.200000047683716
to: 0.799999952316284 [s; relative to TRIGTIME]
Total Fluence
Measured from: -25.2000000476837
to: 44.7999999523163 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.719862 1.104909 1.397143 0.480562
0.142692 0.145610 0.125982 0.110195 [error]
Peak 0.035209 0.038800 0.086105 0.018330
0.018517 0.018366 0.016780 0.013357 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 70.000 -25.200 44.800
T90 63.000 -23.200 39.800
T50 24.000 -12.200 11.800
Peak 1.000 -0.200 0.800
====== 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 -1.220 -0.196 0.202 - - - 3.80e-03 -4.38e-04 4.35e-04 51.800 57
CPL -0.918 -0.398 0.910 221.131 -221.131 -221.131 5.06e-03 -1.95e-03 6.27e-03 51.360 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 -1.428 -0.611 0.586 - - - 1.06e-02 -3.74e-03 3.74e-03 68.340 57
CPL 7.634 -4.108 -7.634 70.359 -10.120 8.076 1.44e+01 -1.44e+01 4.02e+02 61.810 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 2.61e-07 5.70e-07 9.79e-07 3.88e-06 2.68e-06 5.69e-06 erg/cm2
90%_error_low -6.03e-08 -8.31e-08 -1.18e-07 -9.70e-07 -3.04e-07 -1.03e-06 erg/cm2
90%_error_hi 6.58e-08 8.16e-08 1.16e-07 1.18e-06 3.04e-07 1.20e-06 erg/cm2
Peak flux PL 4.08e-01 4.29e-01 3.19e-01 3.83e-01 1.30e+00 1.54e+00 ph/cm2/s
90%_error_low -2.30e-01 -1.78e-01 -1.27e-01 -2.41e-01 -4.89e-01 -5.41e-01 ph/cm2/s
90%_error_hi 2.98e-01 1.76e-01 1.23e-01 3.67e-01 5.02e-01 5.41e-01 ph/cm2/s
Fluence CPL 2.38e-07 5.76e-07 1.02e-06 2.80e-06 2.66e-06 4.88e-06 erg/cm2
90%_error_low -8.11e-08 -8.67e-08 -1.44e-07 -1.49e-06 -3.11e-07 -1.77e-06 erg/cm2
90%_error_hi 8.25e-08 8.70e-08 1.54e-07 1.39e-06 3.10e-07 7.97e-07 erg/cm2
Peak flux CPL 5.05e-03 1.86e-01 6.21e-01 3.78e-02 8.30e-01 8.30e-01 ph/cm2/s
90%_error_low -3.23e-03 -6.98e-02 -2.20e-01 -3.78e-02 -2.30e-01 -2.29e-01 ph/cm2/s
90%_error_hi 7.77e-02 2.38e-01 1.65e-01 8.40e-02 3.23e-01 3.26e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 117.8268 -45.8779 0.0158 49.8054 3.7520 3.8570092 12.086 TRIG_00893808 Foreground time interval of the image: -25.200 44.800 (delta_t = 70.000 [sec]) Background time interval of the image: -239.200 -25.200 (delta_t = 214.000 [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 -25.200 sec. to 44.800 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.22042 ( -0.196324 0.202436 ) Norm@50keV : 3.79671E-03 ( -0.000438344 0.000434765 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.80 using 59 PHA bins. # Reduced chi-squared = 0.9088 for 57 degrees of freedom # Null hypothesis probability = 6.698382e-01 Photon flux (15-150 keV) in 70 sec: 0.446982 ( -0.055991 0.056556 ) ph/cm2/s Energy fluence (15-150 keV) : 2.68138e-06 ( -3.0422e-07 3.04473e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -25.200 sec. to 44.800 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.917786 ( -0.398436 0.909618 ) Epeak [keV] : 221.131 ( -221.135 -221.135 ) Norm@50keV : 5.05996E-03 ( -0.00194604 0.00627187 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.36 using 59 PHA bins. # Reduced chi-squared = 0.9172 for 56 degrees of freedom # Null hypothesis probability = 6.507826e-01 Photon flux (15-150 keV) in 70 sec: 0.438935 ( -0.059747 0.059566 ) ph/cm2/s Energy fluence (15-150 keV) : 2.66096e-06 ( -3.10958e-07 3.09599e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.200 sec. to 0.800 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.4283 ( -0.61119 0.58604 ) Norm@50keV : 1.06214E-02 ( -0.00373834 0.00373816 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.34 using 59 PHA bins. # Reduced chi-squared = 1.199 for 57 degrees of freedom # Null hypothesis probability = 1.443969e-01 Photon flux (15-150 keV) in 1 sec: 1.30204 ( -0.488792 0.50181 ) ph/cm2/s Energy fluence (15-150 keV) : 1.0207e-07 ( -3.70271e-08 3.72778e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.200 sec. to 0.800 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 9.99987 ( -6.47343 -9.99996 ) Epeak [keV] : 68.6168 ( -8.37877 9.81709 ) Norm@50keV : 108.389 ( -108.188 307.708 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.91 using 59 PHA bins. # Reduced chi-squared = 1.088 for 56 degrees of freedom # Null hypothesis probability = 3.035969e-01 Photon flux (15-150 keV) in 1 sec: 0.830355 ( -0.229918 0.322865 ) ph/cm2/s Energy fluence (15-150 keV) : 3.81075e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 63.0 sec. Hardness ratio (energy fluence ratio) = 1.71668284964
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 8.313607e-07 S(50-150 keV) = 1.8499852e-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 = 1.181030750815701E+00, IMY = -7.745111219418808E-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: -239.200000 -25.200000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5568 -40.5437 2.3 46.4 22.0 3.5083 5.0 1.4 Vela X-1 170.3144 -60.7013 3.3 17.2 19.9 0.9595 3.5 4.7 Cen X-3 186.9241 -62.6378 6.3 9.1 23.0 0.5409 1.8 10.8 GX 301-2 244.9775 -15.6369 1.7 54.4 164.8 11.1588 6.7 0.2 Sco X-1 256.0609 -38.0349 0.0 38.5 -169.2 0.4206 1.0 12.0 4U 1700-377 256.4978 -36.5337 6.4 39.9 -170.0 0.7993 1.8 7.3 GX 349+2 262.9529 -24.5680 8.4 53.1 -171.5 -1.2835 -1.4 11.1 GX 1+4 264.7181 -44.3887 6.0 37.2 -154.5 -0.7901 -1.9 3.8 4U 1735-44 270.3867 -25.0298 4.2 55.9 -164.0 3.1964 2.7 6.3 GX 5-1 270.4039 -25.7734 5.8 55.2 -163.5 2.2376 2.0 5.8 GRS 1758-258 275.9270 -30.3605 16.0 53.8 -155.5 0.7343 0.7 0.4 H1820-303 263.1123 -33.8803 11.7 45.1 -165.3 -0.5851 -1.0 6.7 GX 354-0 232.7855 -15.0450 3.2 51.5 150.5 5.7104 3.6 ------ UNKNOWN 139.0143 -41.3293 2.9 44.3 24.3 2.3199 4.0 ------ UNKNOWN 203.8169 -46.0954 2.6 17.3 110.5 1.4422 4.5 ------ UNKNOWN 207.1200 -63.2568 1.1 0.0 -171.8 2.8726 10.3 ------ UNKNOWN 297.1158 -51.9806 3.6 45.3 -122.0 4.1768 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -25.200000 44.800000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.7064 -40.4924 44.4 46.4 22.1 -0.0833 -0.3 8.9 Vela X-1 170.0055 -60.6457 10.9 17.4 19.9 -0.1503 -1.1 9.2 Cen X-3 186.3447 -62.8253 6.4 9.4 21.5 0.2504 1.8 9.2 GX 301-2 244.8209 -15.6610 6.2 54.3 164.6 1.3416 1.9 9.2 Sco X-1 256.0339 -37.8256 4.8 38.7 -169.4 0.4993 2.4 2.5 4U 1700-377 256.3559 -36.2554 4.5 40.1 -170.4 0.5752 2.6 10.8 GX 349+2 263.0422 -24.7181 6.3 53.0 -171.4 0.8178 1.8 2.4 GX 1+4 264.6633 -44.3696 3.7 37.2 -154.5 0.6451 3.1 5.9 4U 1735-44 270.1828 -25.0979 4.7 55.7 -164.1 -1.4479 -2.5 5.6 GX 5-1 270.3060 -25.7608 6.9 55.2 -163.6 -0.9014 -1.7 1.1 GRS 1758-258 275.8033 -30.3444 11.0 53.7 -155.6 -0.5327 -1.0 6.4 H1820-303 262.9015 -33.6475 0.0 45.2 -165.7 -0.3771 -1.4 12.1 GX 354-0 175.0732 -48.8934 2.1 22.5 52.6 0.9172 5.6 ------ UNKNOWN 117.8268 -45.8779 0.9 49.8 3.8 3.8572 12.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 596.000600 659.489300 660.800000 720.435100 720.800000 962.819100 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 270.1327 -24.9478 75.4 37.1 88.5 0.1460 0.2 11.4 GX 5-1 270.3262 -25.6248 3.0 36.9 87.4 3.4826 3.9 7.2 GRS 1758-258 274.1210 -14.1133 4.9 35.7 107.8 1.9631 2.4 8.1 GX 17+2 276.0473 -30.2510 13.0 31.9 79.1 0.5979 0.9 9.4 H1820-303 285.2020 -25.0140 8.2 23.5 89.3 0.6434 1.4 10.6 HT1900.1-2455 288.7936 10.9807 3.8 39.7 155.7 2.5082 3.0 2.1 GRS 1915+105 285.3477 -65.7251 2.7 46.3 24.8 3.4559 4.3 ------ UNKNOWN 313.8305 -10.6829 2.9 12.1 -154.7 1.2983 4.0 ------ UNKNOWN