batgrbproduct Analysis for Trigger=922968
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.
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BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Fri Aug 30 08:39:02 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger922968
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Trigger: 00922968 Segment: 000
BAT Trigger Time: 588801428.096 [s; MET]
Trigger Stop: 588801429.12 [s; MET]
UTC: 2019-08-29T19:56:44.601720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 44.5397196710187 Dec: -8.96781199714715 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.51
Image Trigger?: NO
Rate S/N Ratio: 23.7065391822594 [ if not an image trigger ]
Image S/N Ratio: 8.51
Flight Position: [ source = BAT ]
RA: 44.5397196710187 Dec: -8.96781199714715 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 44.5418653951765 Dec: -8.95789022111053 [deg; J2000]
{ 02h 58m 10.0s , -08d 57' 28.4" }
+/- 1.9303555600102 [arcmin] (estimated 90% radius based on SNR)
+/- 0.968985226460709 [arcmin] (formal 1-sigma fit error)
SNR: 11.8868033719586
Angular difference between Flight and Ground position is 0.608738 arcmin
Partial Coding Fraction: 0.05322266 [ including projection effects ]
Duration
T90: 58.2399998903275 +/- 8.85452204576139
Measured from: -50.3600000143051
to: 7.87999987602234 [s; relative to TRIGTIME]
T50: 5.69599986076355 +/- 1.46082713603859
Measured from: -1.71999990940094
to: 3.97599995136261 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0119999647140503
to: 0.98800003528595 [s; relative to TRIGTIME]
Total Fluence
Measured from: -51.8959999084473
to: 20.1040000915527 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.411876 4.560083 1.731032 0.481090
0.345750 0.357163 0.305294 0.291028 [error]
Peak 0.716480 0.569921 0.177220 0.041299
0.073210 0.069394 0.046126 0.036447 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
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=== 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 Power-law 2.19e-06 2.12e-06 1.44e-06 1.52e-06 6.39e-06 7.27e-06 erg/cm2
Error 2.88e-07 2.27e-07 3.03e-07 6.05e-07 7.23e-07 1.04e-06 erg/cm2
Peak flux Power-law 1.23e+01 4.56e+00 9.70e-01 2.46e-01 1.80e+01 1.81e+01 ph/cm2/s
Error 2.20e+00 7.87e-01 3.32e-01 1.46e-01 2.73e+00 2.73e+00 ph/cm2/s
Fluence Cutoff-PL -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Cutoff-PL -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.564 0.213 - - 1.06e-02 1.63e-03 52.980 57
CPL 1.370 1.109 18.9 0.0 5.95e-02 0.00e+00 49.250 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.232 0.331 - - 5.50e-02 1.48e-02 58.280 57
CPL 1.000 0.000 80.0 0.0 1.07e-01 0.00e+00 131.660 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 8.960000 sec.
T50 in the 50-300 keV band: 4.480000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 72.000 -51.896 20.104
T90 58.240 -50.360 7.880
T50 5.696 -1.720 3.976
Peak 1.000 -0.012 0.988
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
44.5419 -8.9579 0.0161 53.0564 169.5545 11.4549532 11.887 TRIG_00922968
Foreground time interval of the image:
-51.896 12.005 (delta_t = 63.901 [sec])
Background time interval of the image:
-153.795 -51.896 (delta_t = 101.899 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectral Evolution
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 -51.896 sec. to 7.240 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.56418 ( -0.205265 0.221602 )
Norm@50keV : 1.05722E-02 ( -0.00163808 0.00161571 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.98 using 59 PHA bins.
# Reduced chi-squared = 0.9295 for 57 degrees of freedom
# Null hypothesis probability = 6.265477e-01
Photon flux (15-150 keV) in 59.14 sec: 2.16162 ( -0.21713 0.21736 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.36796e-06 ( -7.16233e-07 7.29149e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -51.896 sec. to 7.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36963 ( -1.57487 0.642839 )
Epeak [keV] : 18.8978 ( )
Norm@50keV : 5.94836E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.25 using 59 PHA bins.
# Reduced chi-squared = 0.8794 for 56 degrees of freedom
# Null hypothesis probability = 7.264320e-01
Photon flux (15-150 keV) in 59.14 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit
Power-law model
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.23166 ( -0.301917 0.360041 )
Norm@50keV : 5.50036E-02 ( -0.0149091 0.0147579 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.28 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 57 degrees of freedom
# Null hypothesis probability = 4.281806e-01
Photon flux (15-150 keV) in 1 sec: 17.9964 ( -2.7245 2.7275 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.42027e-07 ( -1.16926e-07 1.17659e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 80.0000 ( )
Norm@50keV : 0.106818 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 131.66 using 59 PHA bins.
# Reduced chi-squared = 2.3510 for 56 degrees of freedom
# Null hypothesis probability = 4.936829e-08
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Aug 30 08:47:57 EDT 2019