batgrbproduct analysis for trigger=959431
batgrbproduct Analysis for Trigger=959431
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): Wed Mar 4 11:52:34 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger959431/GCN5_download_cron
======================================================================
Trigger: 00959431 Segment: 000
BAT Trigger Time: 604895721.984 [s; MET]
Trigger Stop: 604895723.008 [s; MET]
UTC: 2020-03-03T02:34:57.451340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 212.69767656104 Dec: 51.3598967093526 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.7
Image Trigger?: NO
Rate S/N Ratio: 34.322004603461 [ if not an image trigger ]
Image S/N Ratio: 14.7
Flight Position: [ source = BAT ]
RA: 212.69767656104 Dec: 51.3598967093526 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 212.695499644882 Dec: 51.358176663186 [deg; J2000]
{ 14h 10m 46.9s , +51d 21' 29.4" }
+/- 0.757828312430956 [arcmin] (estimated 90% radius based on SNR)
+/- 0.305270684107563 [arcmin] (formal 1-sigma fit error)
SNR: 45.2022503697126
Angular difference between Flight and Ground position is 0.131541 arcmin
Partial Coding Fraction: 0.59375 [ including projection effects ]
Duration
T90: 89.8639999628067 +/- 6.43733393813316
Measured from: -30.327999830246
to: 59.5360001325607 [s; relative to TRIGTIME]
T50: 28.7599999904633 +/- 1.21089719814172
Measured from: -11.0639998912811
to: 17.6960000991821 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.340000033378601
to: 1.3400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: -36.5479999780655
to: 193.259999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.261048 8.042506 5.887350 1.440842
0.111735 0.115018 0.100663 0.082896 [error]
Peak 0.158388 0.239655 0.162434 0.042480
0.011568 0.012528 0.011321 0.008242 [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 2.10e-06 3.52e-06 4.48e-06 1.14e-05 1.33e-05 2.15e-05 erg/cm2
Error 8.90e-08 8.54e-08 1.10e-07 6.52e-07 2.73e-07 6.99e-07 erg/cm2
Peak flux Power-law 1.76e+00 1.68e+00 1.12e+00 1.16e+00 5.04e+00 5.73e+00 ph/cm2/s
Error 1.83e-01 1.10e-01 9.08e-02 1.87e-01 3.21e-01 3.59e-01 ph/cm2/s
Fluence Cutoff-PL 1.95e-06 3.56e-06 4.58e-06 8.31e-06 1.30e-05 1.84e-05 erg/cm2
Error 1.21e-07 9.02e-08 1.27e-07 1.61e-06 3.07e-07 1.64e-06 erg/cm2
Peak flux Cutoff-PL 1.55e+00 1.81e+00 1.18e+00 5.30e-01 4.89e+00 5.07e+00 ph/cm2/s
Error 2.19e-01 1.38e-01 1.05e-01 2.51e-01 3.33e-01 4.16e-01 ph/cm2/s
Fluence Band 3.41e-06 6.52e-06 8.26e-06 1.92e-05 2.38e-05 3.74e-05 erg/cm2
Error -------- 1.74e-07 2.02e-07 1.63e-06 -------- -------- erg/cm2
Peak flux Band 1.45e+00 1.90e+00 1.12e+00 8.41e-01 4.85e+00 5.31e+00 ph/cm2/s
Error -------- -------- -------- -------- 3.36e-01 3.07e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.650 0.039 - - 6.21e-03 1.26e-04 53.750 57
CPL 1.385 0.167 130.4 71.5 8.14e-03 1.37e-03 46.050 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.588 0.105 - - 3.93e-02 2.55e-03 69.550 57
CPL 0.819 0.495 75.4 27.7 9.76e-02 6.14e-02 61.100 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: 75.776000 sec.
T50 in the 50-300 keV band: 28.672000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 229.808 -36.548 193.260
T90 89.864 -30.328 59.536
T50 28.760 -11.064 17.696
Peak 1.000 0.340 1.340
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
212.6955 +51.3582 0.0043 35.2 172.2 15.8155 45.2 TRIG_00959431
------------------------------------------
Foreground time interval of the image:
-36.548 16.317 (delta_t = 52.865 [sec])
Background time interval of the image:
-45.883 -37.954 (delta_t = 7.929 [sec])
-36.984 -36.548 (delta_t = 0.436 [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 -36.548 sec. to 193.260 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65045 ( -0.0392577 0.0392947 )
Norm@50keV : 6.20604E-03 ( -0.000125782 0.000125781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.75 using 59 PHA bins.
# Reduced chi-squared = 0.9431 for 57 degrees of freedom
# Null hypothesis probability = 5.976021e-01
Photon flux (15-150 keV) in 229.8 sec: 0.810477 ( -0.0195936 0.0196849 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32631e-05 ( -2.72931e-07 2.73025e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -36.548 sec. to 193.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38536 ( -0.169904 0.163975 )
Epeak [keV] : 130.437 ( -29.8067 113.106 )
Norm@50keV : 8.14034E-03 ( -0.00123046 0.00150684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.05 using 59 PHA bins.
# Reduced chi-squared = 0.8223 for 56 degrees of freedom
# Null hypothesis probability = 8.260780e-01
Photon flux (15-150 keV) in 229.8 sec: 0.790818 ( -0.022531 0.022713 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30421e-05 ( -3.07495e-07 3.05611e-07 ) ergs/cm2
Band function
Time interval is from -36.548 sec. to 193.260 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22237 ( -0.288775 0.469051 )
beta : -1.79341 ( 1.79315 0.103169 )
Epeak [keV] : 90.1312 ( -34.5177 106.694 )
Norm@50keV : 9.99517E-03 ( -0.0027878 0.00903491 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.8179 for 55 degrees of freedom
# Null hypothesis probability = 8.303093e-01
Photon flux (15-150 keV) in 229.8 sec: 1.65172 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38119e-05 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.1692 ( )
R^2/D10^2 : 6.46765E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 501.00 using 59 PHA bins.
# Reduced chi-squared = 8.7895 for 57 degrees of freedom
# Null hypothesis probability = 2.932970e-72
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.015e-07 3.275e-08
25- 50 3.403e-06 1.011e-07
50-150 6.243e-06 2.206e-07
15-150 1.045e-05 2.378e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 176.264 (-17.9811 22.1384)
Norm : 3.23978 (-0.0837049 0.0874561)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.16 using 59 PHA bins.
# Reduced chi-squared = 0.8274 for 57 degrees of freedom
# Null hypothesis probability = 8.205265e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.876e-06 9.123e-08
25- 50 3.558e-06 1.861e-07
50-150 7.498e-06 1.540e-06
15-150 1.293e-05 1.712e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.85098 (-0.688161 0.722529)
R1^2/D10^2 : 0.557697 (-0.139953 0.207875)
kT2 [keV] : 27.3107 (-2.2508 2.90496)
R2^2/D10^2 : 7.57793E-03 (-0.00239384 0.00299087)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.43 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 55 degrees of freedom
# Null hypothesis probability = 1.054419e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.623e-06 1.303e-07
25- 50 3.657e-06 1.528e-07
50-150 7.501e-06 4.033e-07
15-150 1.278e-05 5.079e-07
Peak spectrum fit
Power-law model
Time interval is from 0.340 sec. to 1.340 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58833 ( -0.104756 0.10616 )
Norm@50keV : 3.93482E-02 ( -0.00255313 0.00254251 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.55 using 59 PHA bins.
# Reduced chi-squared = 1.220 for 57 degrees of freedom
# Null hypothesis probability = 1.230560e-01
Photon flux (15-150 keV) in 1 sec: 5.03831 ( -0.320861 0.321194 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.68523e-07 ( -2.55939e-08 2.57284e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.340 sec. to 1.340 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.819318 ( -0.523634 0.465918 )
Epeak [keV] : 75.4225 ( -13.7572 41.7177 )
Norm@50keV : 9.76234E-02 ( -0.0406764 0.0821704 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.10 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 56 degrees of freedom
# Null hypothesis probability = 2.977491e-01
Photon flux (15-150 keV) in 1 sec: 4.88760 ( -0.3331 0.33317 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50084e-07 ( -2.8253e-08 2.8277e-08 ) ergs/cm2
Band function
Time interval is from 0.340 sec. to 1.340 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.15244E-02 ( -1.05103 2.20239 )
beta : -1.94457 ( 1.94446 0.243189 )
Epeak [keV] : 51.0070 ( -14.5946 41.0899 )
Norm@50keV : 0.295259 ( -0.316235 8.41557 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.33 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 55 degrees of freedom
# Null hypothesis probability = 3.208673e-01
Photon flux (15-150 keV) in 1 sec: 4.85176 ( 2.14824 -0.33557 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5326e-07 ( -3.53253e-07 -2.6971e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.8452 (-0.986574 1.07299)
R^2/D10^2 : 0.765443 (-0.1808 0.233046)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.13 using 59 PHA bins.
# Reduced chi-squared = 1.704 for 57 degrees of freedom
# Null hypothesis probability = 7.317410e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.103e-08 3.300e-09
25- 50 1.141e-07 8.650e-09
50-150 1.432e-07 1.805e-08
15-150 2.883e-07 2.200e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 172.718 (-44.7105 -172.238)
Norm : 20.7362 (-1.40139 1.52496)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.51 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 57 degrees of freedom
# Null hypothesis probability = 2.579587e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.254e-08 4.460e-09
25- 50 9.929e-08 1.530e-08
50-150 2.071e-07 8.129e-08
15-150 3.589e-07 9.690e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.64196 (-1.88259 1.89506)
R1^2/D10^2 : 2.71270 (-1.14043 2.7454)
kT2 [keV] : 27.3434 (-6.87565 18.2267)
R2^2/D10^2 : 4.37060E-02 (-0.0360552 0.0971836)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.30 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 55 degrees of freedom
# Null hypothesis probability = 2.902213e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.397e-08 9.180e-09
25- 50 1.088e-07 2.340e-08
50-150 2.001e-07 8.421e-08
15-150 3.529e-07 1.104e-07
Plot creation:
Wed Mar 4 11:56:30 EST 2020