batgrbproduct analysis for trigger=952164
batgrbproduct Analysis for Trigger=952164
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): Mon Jan 27 08:32:40 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger952164/batgroup_hand_proc
======================================================================
Trigger: 00952164 Segment: 000
BAT Trigger Time: 601644723.52 [s; MET]
Trigger Stop: 601644731.712 [s; MET]
UTC: 2020-01-25T11:31:39.198280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 228.046615901226 Dec: -8.14842299022016 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.97
Image Trigger?: NO
Rate S/N Ratio: 12.2065556157337 [ if not an image trigger ]
Image S/N Ratio: 7.97
Flight Position: [ source = BAT ]
RA: 228.046615901226 Dec: -8.14842299022016 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 228.06927460046 Dec: -8.1420304839966 [deg; J2000]
{ 15h 12m 16.6s , -08d 08' 31.3" }
+/- 1.77967438904185 [arcmin] (estimated 90% radius based on SNR)
+/- 0.777876580447425 [arcmin] (formal 1-sigma fit error)
SNR: 13.3502384249934
Angular difference between Flight and Ground position is 1.399396 arcmin
Partial Coding Fraction: 0.4296875 [ including projection effects ]
Duration
T90: 350.827999949455 +/- 34.0324778966433
Measured from: -15.472000002861
to: 335.355999946594 [s; relative to TRIGTIME]
T50: 105.087999939919 +/- 89.9133209690049
Measured from: 185.180000066757
to: 290.268000006676 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 286.667999982834
to: 287.667999982834 [s; relative to TRIGTIME]
Total Fluence
Measured from: -36.2239999771118
to: 427.736000061035 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.736099 5.974235 3.474632 0.306758
0.172900 0.169135 0.160504 0.177774 [error]
Peak 0.126849 0.182573 0.141496 0.019330
0.008321 0.008997 0.008224 0.007304 [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 1.84e-06 2.58e-06 2.67e-06 5.07e-06 8.69e-06 1.22e-05 erg/cm2
Error 1.22e-07 9.71e-08 1.64e-07 6.74e-07 3.62e-07 8.00e-07 erg/cm2
Peak flux Power-law 1.29e+00 1.32e+00 9.50e-01 1.09e+00 3.99e+00 4.65e+00 ph/cm2/s
Error 1.27e-01 7.95e-02 6.83e-02 1.62e-01 2.28e-01 2.66e-01 ph/cm2/s
Fluence Cutoff-PL 1.80e-06 2.61e-06 2.66e-06 3.92e-06 8.55e-06 1.10e-05 erg/cm2
Error 1.11e-07 1.14e-07 1.69e-07 1.61e-06 4.60e-07 1.34e-06 erg/cm2
Peak flux Cutoff-PL 1.14e+00 1.40e+00 9.97e-01 5.41e-01 3.86e+00 4.07e+00 ph/cm2/s
Error 1.55e-01 9.50e-02 7.80e-02 2.34e-01 2.41e-01 3.40e-01 ph/cm2/s
Fluence Band 1.76e-06 2.60e-06 2.64e-06 4.87e-06 8.58e-06 1.19e-05 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 1.949 0.080 - - 2.04e-03 8.71e-05 56.290 57
CPL 1.801 0.303 61.7 0.0 2.44e-03 0.00e+00 55.560 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.474 0.098 - - 3.22e-02 1.85e-03 65.050 57
CPL 0.800 0.445 89.3 41.2 6.99e-02 3.75e-02 57.200 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: 324.480000 sec.
T50 in the 50-300 keV band: 240.448000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 463.960 -36.224 427.736
T90 350.828 -15.472 335.356
T50 105.088 185.180 290.268
Peak 1.000 286.668 287.668
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
228.0693 -8.1420 0.0144 29.0 102.4 3.6528 13.4 TRIG_00952164
------------------------------------------
Foreground time interval of the image:
-36.224 51.181 (delta_t = 87.405 [sec])
Background time interval of the image:
-179.520 -36.224 (delta_t = 143.296 [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 -36.224 sec. to 427.736 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94936 ( -0.0797338 0.0808003 )
Norm@50keV : 2.03542E-03 ( -8.74201e-05 8.67493e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.29 using 59 PHA bins.
# Reduced chi-squared = 0.9876 for 57 degrees of freedom
# Null hypothesis probability = 5.015991e-01
Photon flux (15-150 keV) in 464 sec: 0.298420 ( -0.0118376 0.0119032 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.69118e-06 ( -3.60442e-07 3.6301e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -36.224 sec. to 427.736 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80084 ( -0.315092 0.291799 )
Epeak [keV] : 61.6957 ( )
Norm@50keV : 2.43603E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.56 using 59 PHA bins.
# Reduced chi-squared = 0.9922 for 56 degrees of freedom
# Null hypothesis probability = 4.913278e-01
Photon flux (15-150 keV) in 464 sec: 0.294754 ( -0.013734 0.013745 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.54521e-06 ( -4.61819e-07 4.58757e-07 ) ergs/cm2
Band function
Time interval is from -36.224 sec. to 427.736 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.80081 ( -5.79851 0.222112 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 61.6837 ( -46.1034 -61.6837 )
Norm@50keV : 2.43554E-03 ( -0.000474685 0.00110112 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.56 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Null hypothesis probability = 4.533967e-01
Photon flux (15-150 keV) in 464 sec: 0.295003 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.58497e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.4143 ( )
R^2/D10^2 : 7.74812E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 210.67 using 59 PHA bins.
# Reduced chi-squared = 3.6960 for 57 degrees of freedom
# Null hypothesis probability = 1.757667e-19
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.850e-07 7.540e-08
25- 50 2.918e-06 1.244e-07
50-150 2.208e-06 2.107e-07
15-150 6.111e-06 2.598e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 80.5904 (-10.7828 13.6065)
Norm : 1.35195 (-0.088496 0.0978015)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.96 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.036439e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.629e-06 9.674e-08
25- 50 2.686e-06 1.016e-07
50-150 3.810e-06 3.543e-07
15-150 8.124e-06 3.758e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.62990 (-0.674468 0.739114)
R1^2/D10^2 : 0.841033 (-0.319199 0.578758)
kT2 [keV] : 20.3836 (-2.40122 3.20433)
R2^2/D10^2 : 6.80838E-03 (-0.00292723 0.00436877)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.44 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.208341e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.742e-06 2.188e-07
25- 50 2.557e-06 2.554e-07
50-150 4.001e-06 5.765e-07
15-150 8.300e-06 8.190e-07
Peak spectrum fit
Power-law model
Time interval is from 286.668 sec. to 287.668 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47389 ( -0.0978481 0.0985094 )
Norm@50keV : 3.21593E-02 ( -0.00184795 0.00184302 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.05 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 57 degrees of freedom
# Null hypothesis probability = 2.167645e-01
Photon flux (15-150 keV) in 1 sec: 3.98721 ( -0.227639 0.227872 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06427e-07 ( -1.94034e-08 1.95251e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 286.668 sec. to 287.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.800365 ( -0.468079 0.421488 )
Epeak [keV] : 89.3087 ( -18.4057 63.9855 )
Norm@50keV : 6.99471E-02 ( -0.0264438 0.0485222 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.20 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 56 degrees of freedom
# Null hypothesis probability = 4.304064e-01
Photon flux (15-150 keV) in 1 sec: 3.85731 ( -0.24128 0.241 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90861e-07 ( -2.1723e-08 2.1825e-08 ) ergs/cm2
Band function
Time interval is from 286.668 sec. to 287.668 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.785235 ( -0.426726 1.02202 )
beta : -2.33603 ( 2.34192 0.747916 )
Epeak [keV] : 87.7473 ( -19.071 63.8717 )
Norm@50keV : 7.14556E-02 ( -0.0232462 0.233664 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.16 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 55 degrees of freedom
# Null hypothesis probability = 3.949269e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90391e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.1744 (-1.00384 1.08644)
R^2/D10^2 : 0.440472 (-0.0948478 0.119404)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 100.18 using 59 PHA bins.
# Reduced chi-squared = 1.7576 for 57 degrees of freedom
# Null hypothesis probability = 3.603146e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.119e-08 2.105e-09
25- 50 8.510e-08 6.090e-09
50-150 1.341e-07 1.520e-08
15-150 2.404e-07 1.625e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-32.4083 -200)
Norm : 16.3309 (-0.912426 0.912426)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.48 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.187285e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.078e-08 2.635e-09
25- 50 7.844e-08 4.825e-09
50-150 1.720e-07 3.095e-08
15-150 2.913e-07 4.280e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.76704 (-2.00614 2.45268)
R1^2/D10^2 : 3.73213 (-2.20319 5.45798)
kT2 [keV] : 22.2247 (-3.69593 7.64541)
R2^2/D10^2 : 9.33219E-02 (-0.0641068 0.0997247)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.29 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 55 degrees of freedom
# Null hypothesis probability = 3.220125e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.496e-08 9.550e-09
25- 50 7.909e-08 1.504e-08
50-150 1.717e-07 4.465e-08
15-150 2.857e-07 6.420e-08
Plot creation:
Mon Jan 27 08:50:16 EST 2020