batgrbproduct analysis for trigger=958592
batgrbproduct Analysis for Trigger=958592
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Fri Feb 28 07:34:25 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger958592/GCN5_download_cron
======================================================================
Trigger: 00958592 Segment: 000
BAT Trigger Time: 604480832.512 [s; MET]
Trigger Stop: 604480833.536 [s; MET]
UTC: 2020-02-27T07:20:08.006260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 56.4359448856047 Dec: 9.49094958213362 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.47
Image Trigger?: NO
Rate S/N Ratio: 13.7840487520902 [ if not an image trigger ]
Image S/N Ratio: 10.47
Flight Position: [ source = BAT ]
RA: 56.4359448856047 Dec: 9.49094958213362 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 56.4330000330177 Dec: 9.48943251465221 [deg; J2000]
{ 03h 45m 43.9s , +09d 29' 22.0" }
+/- 0.694923177227 [arcmin] (estimated 90% radius based on SNR)
+/- 0.322872440711571 [arcmin] (formal 1-sigma fit error)
SNR: 51.159107136097
Angular difference between Flight and Ground position is 0.196612 arcmin
Partial Coding Fraction: 0.4648438 [ including projection effects ]
Duration
T90: 32.7599999904633 +/- 9.73705577789743
Measured from: 2.34000015258789
to: 35.1000001430511 [s; relative to TRIGTIME]
T50: 8.97599995136261 +/- 0.415095183356454
Measured from: 7.72800016403198
to: 16.7040001153946 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.5440000295639
to: 9.5440000295639 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.495999932289124
to: 87.6399999856949 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.392142 3.849256 3.236149 0.862673
0.074720 0.081040 0.072200 0.056576 [error]
Peak 0.145786 0.206260 0.249756 0.082415
0.012492 0.014151 0.014246 0.009661 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== 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 9.25e-07 1.74e-06 2.53e-06 7.84e-06 7.18e-06 1.30e-05 erg/cm2
Error 4.83e-08 5.35e-08 7.47e-08 5.27e-07 1.88e-07 5.62e-07 erg/cm2
Peak flux Power-law 1.55e+00 1.81e+00 1.52e+00 2.17e+00 5.65e+00 7.04e+00 ph/cm2/s
Error 1.95e-01 1.39e-01 1.11e-01 3.35e-01 3.81e-01 4.65e-01 ph/cm2/s
Fluence Cutoff-PL 8.52e-07 1.77e-06 2.61e-06 5.41e-06 7.08e-06 1.06e-05 erg/cm2
Error 6.30e-08 5.73e-08 8.95e-08 1.18e-06 2.00e-07 1.18e-06 erg/cm2
Peak flux Cutoff-PL 1.51e+00 1.82e+00 1.54e+00 1.96e+00 5.63e+00 6.83e+00 ph/cm2/s
Error 2.26e-01 1.46e-01 1.34e-01 5.39e-01 3.91e-01 7.10e-01 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 1.460 0.046 - - 8.53e-03 2.18e-04 63.550 57
CPL 1.148 0.192 156.4 88.9 1.17e-02 2.25e-03 55.280 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.248 0.112 - - 4.78e-02 3.07e-03 44.250 57
CPL 1.151 0.299 500.6 0.0 5.29e-02 2.15e-02 44.090 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: 20.672000 sec.
T50 in the 50-300 keV band: 7.616000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 88.136 -0.496 87.640
T90 32.760 2.340 35.100
T50 8.976 7.728 16.704
Peak 1.000 8.544 9.544
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
56.4330 +9.4894 0.0038 42.2 -22.8 5.3574 51.2 TRIG_00958592
------------------------------------------
Foreground time interval of the image:
-0.496 11.589 (delta_t = 12.085 [sec])
Background time interval of the image:
-60.512 -0.496 (delta_t = 60.016 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.496 sec. to 87.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46030 ( -0.0464666 0.046395 )
Norm@50keV : 8.53138E-03 ( -0.000217904 0.000217863 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.55 using 59 PHA bins.
# Reduced chi-squared = 1.115 for 57 degrees of freedom
# Null hypothesis probability = 2.567426e-01
Photon flux (15-150 keV) in 88.14 sec: 1.05411 ( -0.0305319 0.0305793 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.18219e-06 ( -1.88002e-07 1.88111e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.496 sec. to 87.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14757 ( -0.195751 0.187755 )
Epeak [keV] : 156.369 ( -38.6772 139.16 )
Norm@50keV : 1.17273E-02 ( -0.0019923 0.00250576 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.28 using 59 PHA bins.
# Reduced chi-squared = 0.9871 for 56 degrees of freedom
# Null hypothesis probability = 5.021679e-01
Photon flux (15-150 keV) in 88.14 sec: 1.03092 ( -0.033044 0.03321 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.07745e-06 ( -2.0051e-07 1.99611e-07 ) ergs/cm2
Band function
Time interval is from -0.496 sec. to 87.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14752 ( -0.446324 0.843107 )
beta : -10.0000 ( 10 5.32907e-15 )
Epeak [keV] : 156.338 ( -21.3416 139.131 )
Norm@50keV : 1.17264E-02 ( -0.00199262 0.00250615 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.28 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 55 degrees of freedom
# Null hypothesis probability = 4.641383e-01
Photon flux (15-150 keV) in 88.14 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.9722 ( )
R^2/D10^2 : 6.31895E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 346.12 using 59 PHA bins.
# Reduced chi-squared = 6.0723 for 57 degrees of freedom
# Null hypothesis probability = 5.092374e-43
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.604e-07 1.970e-08
25- 50 1.665e-06 6.566e-08
50-150 3.901e-06 1.507e-07
15-150 5.926e-06 1.635e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-5.54265 -200)
Norm : 4.39673 (-0.11208 0.11208)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.18 using 59 PHA bins.
# Reduced chi-squared = 1.372 for 57 degrees of freedom
# Null hypothesis probability = 3.280061e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.650e-07 2.688e-08
25- 50 1.856e-06 5.597e-08
50-150 4.071e-06 1.243e-07
15-150 6.893e-06 1.926e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.00754 (-0.816361 0.869143)
R1^2/D10^2 : 0.628744 (-0.177616 0.275595)
kT2 [keV] : 29.0745 (-2.53462 3.32615)
R2^2/D10^2 : 9.55437E-03 (-0.00309614 0.00385809)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.06 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Null hypothesis probability = 2.974902e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.565e-07 7.673e-08
25- 50 1.818e-06 1.111e-07
50-150 4.472e-06 2.812e-07
15-150 7.046e-06 3.746e-07
Peak spectrum fit
Power-law model
Time interval is from 8.544 sec. to 9.544 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24832 ( -0.111881 0.11151 )
Norm@50keV : 4.77759E-02 ( -0.00306824 0.00306758 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.25 using 59 PHA bins.
# Reduced chi-squared = 0.7763 for 57 degrees of freedom
# Null hypothesis probability = 8.912865e-01
Photon flux (15-150 keV) in 1 sec: 5.64912 ( -0.380513 0.381356 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.78351e-07 ( -3.32151e-08 3.33146e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.544 sec. to 9.544 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15073 ( -0.444536 0.153215 )
Epeak [keV] : 500.577 ( -500.251 -500.251 )
Norm@50keV : 5.28781E-02 ( -0.0133039 0.029609 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.09 using 59 PHA bins.
# Reduced chi-squared = 0.7873 for 56 degrees of freedom
# Null hypothesis probability = 8.754684e-01
Photon flux (15-150 keV) in 1 sec: 5.62671 ( -0.39108 0.39149 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.77169e-07 ( -3.3975e-08 3.3438e-08 ) ergs/cm2
Band function
Time interval is from 8.544 sec. to 9.544 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13118 ( 0.952694 0.952694 )
beta : -8.07969 ( 9.05691 19.0126 )
Epeak [keV] : 444.870 ( -228.232 -446.626 )
Norm@50keV : 5.37838E-02 ( -0.0191381 0.0174644 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.10 using 59 PHA bins.
# Reduced chi-squared = 0.8018 for 55 degrees of freedom
# Null hypothesis probability = 8.536839e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.2707 (-1.68262 1.8632)
R^2/D10^2 : 0.247768 (-0.0624707 0.0823281)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 99.26 using 59 PHA bins.
# Reduced chi-squared = 1.741 for 57 degrees of freedom
# Null hypothesis probability = 4.471421e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.952e-08 2.700e-09
25- 50 9.810e-08 9.630e-09
50-150 2.993e-07 3.175e-08
15-150 4.170e-07 3.550e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-12.9918 -200)
Norm : 23.6342 (-1.54427 1.54427)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.60 using 59 PHA bins.
# Reduced chi-squared = 1.186 for 57 degrees of freedom
# Null hypothesis probability = 1.590224e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.884e-08 4.275e-09
25- 50 1.132e-07 9.200e-09
50-150 2.482e-07 4.750e-08
15-150 4.203e-07 7.300e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.05721 (-1.34471 1.76205)
R1^2/D10^2 : 8.05790 (-4.82324 13.9458)
kT2 [keV] : 28.1199 (-3.68222 5.60727)
R2^2/D10^2 : 7.44155E-02 (-0.0342549 0.0461975)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.18 using 59 PHA bins.
# Reduced chi-squared = 0.7850 for 55 degrees of freedom
# Null hypothesis probability = 8.760241e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.939e-08 1.745e-08
25- 50 9.796e-08 1.913e-08
50-150 3.319e-07 5.325e-08
15-150 4.793e-07 7.150e-08
Plot creation:
Fri Feb 28 07:38:15 EST 2020