batgrbproduct analysis for trigger=1007266
batgrbproduct Analysis for Trigger=1007266
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 v2.48
Process Start Time (local time): Thu Nov 19 06:31:29 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger1007266/GCN5_download_cron
======================================================================
Trigger: 01007266 Segment: 000
BAT Trigger Time: 627376112 [s; MET]
Trigger Stop: 627376288 [s; MET]
UTC: 2020-11-18T07:08:05.998020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 84.7205635396726 Dec: 26.3266571610648 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 26.23
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 26.23
Flight Position: [ source = BAT ]
RA: 84.7205635396726 Dec: 26.3266571610648 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 84.7422254031269 Dec: 26.3325535713531 [deg; J2000]
{ 05h 38m 58.1s , +26d 19' 57.2" }
+/- 2.06704731877832 [arcmin] (estimated 90% radius based on SNR)
+/- 1.04247485414949 [arcmin] (formal 1-sigma fit error)
SNR: 10.7799757029393
Angular difference between Flight and Ground position is 1.217415 arcmin
Partial Coding Fraction: 0.4492188 [ including projection effects ]
Duration
T90: 382.65600001812 +/- 11.4394023176173
Measured from: -195.579999923706
to: 187.076000094414 [s; relative to TRIGTIME]
T50: 197.09199988842 +/- 4.56400702190695
Measured from: -70.1519998311996
to: 126.94000005722 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 148.672000050545
to: 149.672000050545 [s; relative to TRIGTIME]
Total Fluence
Measured from: -228.927999973297
to: 201.588000059128 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 80.042737 63.644195 8.927840 0.361284
0.280460 0.267415 0.182140 0.146859 [error]
Peak 0.321953 0.247570 0.032652 -0.005981
0.015492 0.014918 0.009030 0.006665 [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 4.22e-05 2.34e-05 8.18e-06 3.73e-06 7.59e-05 7.76e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 3.72e+00 1.59e+00 4.03e-01 1.26e-01 5.78e+00 5.83e+00 ph/cm2/s
Error 3.35e-01 1.30e-01 6.26e-02 3.37e-02 4.36e-01 4.38e-01 ph/cm2/s
Fluence Cutoff-PL 2.79e-05 2.76e-05 6.78e-06 2.42e-07 6.25e-05 6.26e-05 erg/cm2
Error 1.55e-06 5.58e-07 2.68e-07 5.37e-08 1.82e-06 1.82e-06 erg/cm2
Peak flux Cutoff-PL 3.26e+00 2.07e+00 2.40e-01 2.46e-03 5.56e+00 5.56e+00 ph/cm2/s
Error 3.82e-01 1.92e-01 8.31e-02 4.62e-03 4.41e-01 4.41e-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 3.519 0.000 - - 1.11e-02 0.00e+00 604.930 57
CPL 0.601 0.270 19.4 2.0 4.89e-01 1.74e-01 50.740 56
The chi2 of BB fit is 207.27 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.978 0.149 - - 2.14e-02 2.60e-03 94.980 57
CPL 0.029 1.187 22.5 4.0 1.75e+00 8.22e+00 55.150 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: 1.792000 sec.
T50 in the 50-300 keV band: 0.640000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 430.516 -228.928 201.588
T90 382.656 -195.580 187.076
T50 197.092 -70.152 126.940
Peak 1.000 148.672 149.672
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
84.7422 +26.3326 0.0179 29.3 106.4 29.6789 10.8 TRIG_01007266
------------------------------------------
Foreground time interval of the image:
-228.928 175.001 (delta_t = 403.929 [sec])
Background time interval of the image:
-239.000 -228.928 (delta_t = 10.072 [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 -228.928 sec. to 201.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.51927 ( )
Norm@50keV : 1.10701E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 604.93 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.39e-92 with 57 degrees of freedom
Photon flux (15-150 keV) in 430.5 sec: 4.54818 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.58864e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -228.928 sec. to 201.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.601248 ( -0.275006 0.264023 )
Epeak [keV] : 19.4283 ( -2.13387 1.86101 )
Norm@50keV : 0.489275 ( -0.140336 0.206687 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.74 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.74e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 430.5 sec: 3.48104 ( -0.13202 0.13401 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.25461e-05 ( -1.81284e-06 1.83092e-06 ) ergs/cm2
Band function
Time interval is from -228.928 sec. to 201.588 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.475278 ( -0.333432 0.549069 )
beta : -5.63196 ( 5.62924 0.954891 )
Epeak [keV] : 20.1457 ( -2.40344 2.61033 )
Norm@50keV : 0.585489 ( -0.209359 0.681222 )
------------------------------------------------------------
Photon flux (15-150 keV) in 430.5 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] : 7.36950 ( )
R^2/D10^2 : 4.78708 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 207.27 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.19e-19 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.891e-05 6.866e-07
25- 50 2.855e-05 5.661e-07
50-150 5.679e-06 2.131e-07
15-150 5.314e-05 1.141e-06
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.2405 (-0.425398 0.440019)
Norm : 49.1708 (-2.33996 2.44464)
------------------------------------------------------------
#Fit statistic : Chi-Squared 75.81 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.85e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.175e-05 1.005e-06
25- 50 2.697e-05 4.865e-07
50-150 7.563e-06 2.540e-07
15-150 6.628e-05 1.421e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.37723 (-0.443375 0.41369)
R1^2/D10^2 : 15.3942 (-3.52651 5.57409)
kT2 [keV] : 10.1713 (-0.783691 1.07538)
R2^2/D10^2 : 0.486090 (-0.248626 0.384561)
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.13 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.99e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.581e-05 2.226e-06
25- 50 2.792e-05 1.935e-06
50-150 7.138e-06 1.246e-06
15-150 6.087e-05 5.166e-06
Peak spectrum fit
Power-law model
Time interval is from 148.672 sec. to 149.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.97806 ( -0.144286 0.153366 )
Norm@50keV : 2.13701E-02 ( -0.00259906 0.0026084 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 94.98 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.19e-03 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 5.78397 ( -0.436248 0.436544 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54212e-07 ( -2.03202e-08 2.04602e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 148.672 sec. to 149.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.91482E-02 ( -1.31186 1.06241 )
Epeak [keV] : 22.5080 ( -5.02169 3.04602 )
Norm@50keV : 1.75092 ( -2.38444 14.054 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.15 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.07e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 5.56427 ( -0.44062 0.44092 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.34342e-07 ( -1.8629e-08 1.8942e-08 ) ergs/cm2
Band function
Time interval is from 148.672 sec. to 149.672 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.157807 ( -0.94798 1.52199 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 23.0532 ( -5.0034 3.08594 )
Norm@50keV : 2.37742 ( -2.37736 14.026 )
------------------------------------------------------------
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] : 6.60391 (-0.431225 0.450712)
R^2/D10^2 : 14.3078 (-3.7102 5.11946)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.12 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.98e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.398e-08 1.083e-08
25- 50 1.147e-07 1.070e-08
50-150 1.532e-08 4.265e-09
15-150 2.239e-07 1.795e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.7381 (-2.54797 2.92149)
Norm : 65.1460 (-9.92296 11.9389)
------------------------------------------------------------
#Fit statistic : Chi-Squared 61.47 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.19e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.081e-07 1.007e-08
25- 50 1.007e-07 8.755e-09
50-150 3.458e-08 8.840e-09
15-150 2.434e-07 2.065e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.72263 (-3.17526 5.29374)
R1^2/D10^2 : 32.8708 (-22.3447 9974.8)
kT2 [keV] : 8.51295 (-6.9639 6.42026)
R2^2/D10^2 : 2.75790 (-2.70869 10.4214)
------------------------------------------------------------
#Fit statistic : Chi-Squared 54.70 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.86e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.010e-07 5.620e-08
25- 50 1.091e-07 5.660e-08
50-150 2.461e-08 1.457e-08
15-150 2.347e-07 1.192e-07
Plot creation:
Thu Nov 19 06:37:43 EST 2020