batgrbproduct analysis for trigger=1006906
batgrbproduct Analysis for Trigger=1006906
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): Tue Nov 17 19:21:30 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger1006906/GCN5_download_cron
======================================================================
Trigger: 01006906 Segment: 000
BAT Trigger Time: 627260384 [s; MET]
Trigger Stop: 627260448 [s; MET]
UTC: 2020-11-16T22:59:18.005640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 85.7763755837787 Dec: 25.2325644711137 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 22.14
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 22.14
Flight Position: [ source = BAT ]
RA: 85.7763755837787 Dec: 25.2325644711137 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 85.7836247158736 Dec: 25.2357365744443 [deg; J2000]
{ 05h 43m 08.1s , +25d 14' 08.7" }
+/- 1.02060682394206 [arcmin] (estimated 90% radius based on SNR)
+/- 0.50455801717323 [arcmin] (formal 1-sigma fit error)
SNR: 29.5436007752647
Angular difference between Flight and Ground position is 0.437059 arcmin
Partial Coding Fraction: 0.15625 [ including projection effects ]
Duration
T90: 358.479999899864 +/- 13.1066401062306
Measured from: -110.483999848366
to: 247.996000051498 [s; relative to TRIGTIME]
T50: 218.015999913216 +/- 4.44977886235212
Measured from: -55.8439998626709
to: 162.172000050545 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 227.12399995327
to: 228.12399995327 [s; relative to TRIGTIME]
Total Fluence
Measured from: -122.907999992371
to: 294.172000050545 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 72.275265 57.536671 8.225210 0.558158
0.297101 0.290262 0.215473 0.206264 [error]
Peak 0.347886 0.317899 0.049352 0.001111
0.010991 0.010783 0.006756 0.005867 [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 3.94e-05 2.22e-05 7.87e-06 3.66e-06 7.14e-05 7.31e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 4.73e+00 2.13e+00 5.76e-01 1.94e-01 7.55e+00 7.63e+00 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Cutoff-PL 2.57e-05 2.61e-05 6.06e-06 1.76e-07 5.80e-05 5.80e-05 erg/cm2
Error 1.52e-06 5.40e-07 2.91e-07 4.61e-08 1.78e-06 1.78e-06 erg/cm2
Peak flux Cutoff-PL 3.72e+00 2.70e+00 3.94e-01 5.95e-03 6.82e+00 6.82e+00 ph/cm2/s
Error 3.70e-01 1.54e-01 7.07e-02 5.26e-03 4.08e-01 4.08e-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 3.496 0.000 - - 1.09e-02 0.00e+00 531.740 57
CPL 0.373 0.306 20.7 1.9 6.60e-01 2.72e-01 44.180 56
The chi2 of BB fit is 148.05 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 2.885 0.000 - - 2.98e-02 0.00e+00 120.920 57
CPL -0.236 0.749 25.7 2.7 2.58e+00 3.58e+00 36.360 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: 65.024000 sec.
T50 in the 50-300 keV band: 35.392000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 417.080 -122.908 294.172
T90 358.480 -110.484 247.996
T50 218.016 -55.844 162.172
Peak 1.000 227.124 228.124
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
85.7836 +25.2357 0.0065 36.8 86.5 27.0590 29.5 TRIG_01006906
------------------------------------------
Foreground time interval of the image:
-18.799 69.701 (delta_t = 88.500 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
-122.908000 209.820000
211.000000 294.172000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.49604 ( )
Norm@50keV : 1.09442E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 531.74 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.16e-78 with 57 degrees of freedom
Photon flux (15-150 keV) in 415.9 sec: 4.41228 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.14495e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-122.908000 209.820000
211.000000 294.172000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.373403 ( -0.313013 0.299835 )
Epeak [keV] : 20.6521 ( -2.05766 1.78054 )
Norm@50keV : 0.660221 ( -0.212805 0.331342 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.18 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.73e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 415.9 sec: 3.33782 ( -0.13298 0.13527 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.80002e-05 ( -1.76508e-06 1.78587e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-122.908000 209.820000
211.000000 294.172000
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.69201 ( )
beta : -8.53835 ( )
Epeak [keV] : 6.95840 ( )
Norm@50keV : 0.113516 ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 415.9 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] : 7.23905 ( )
R^2/D10^2 : 5.09027 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 148.05 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.97e-10 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.843e-05 6.738e-07
25- 50 2.691e-05 5.240e-07
50-150 5.028e-06 2.163e-07
15-150 5.037e-05 1.144e-06
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.0127 (-0.46112 0.478072)
Norm : 48.7430 (-2.45322 2.57653)
------------------------------------------------------------
#Fit statistic : Chi-Squared 77.78 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.51e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.008e-05 9.919e-07
25- 50 2.531e-05 5.095e-07
50-150 6.954e-06 2.807e-07
15-150 6.235e-05 1.352e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.72745 (-0.555192 0.57711)
R1^2/D10^2 : 21.3869 (-7.10926 13.7861)
kT2 [keV] : 8.85189 (-0.513172 0.760294)
R2^2/D10^2 : 1.25242 (-0.579035 0.661082)
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.34 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.94e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.507e-05 2.805e-06
25- 50 2.606e-05 2.107e-06
50-150 6.212e-06 7.050e-07
15-150 5.734e-05 5.469e-06
Peak spectrum fit
Power-law model
Time interval is from 227.124 sec. to 228.124 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.88550 ( )
Norm@50keV : 2.97979E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 120.92 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.69e-06 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 7.54991 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.40439e-07 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 227.124 sec. to 228.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.236386 ( -0.791857 0.706238 )
Epeak [keV] : 25.7085 ( -3.0795 2.27551 )
Norm@50keV : 2.57747 ( -1.64199 5.52794 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 36.36 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.81e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 6.82106 ( -0.40705 0.40923 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.00671e-07 ( -1.6377e-08 1.6595e-08 ) ergs/cm2
Band function
Time interval is from 227.124 sec. to 228.124 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.287733 ( -0.715983 0.901402 )
beta : -6.49474 ( 6.50099 2.19998 )
Epeak [keV] : 25.7996 ( -3.11149 2.20634 )
Norm@50keV : 2.78964 ( -1.4999 7.6471 )
------------------------------------------------------------
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] : 7.31138 (-0.306273 0.315383)
R^2/D10^2 : 11.4356 (-2.00568 2.45836)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.93 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.76e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.025e-07 7.605e-09
25- 50 1.525e-07 7.850e-09
50-150 2.951e-08 4.725e-09
15-150 2.845e-07 1.400e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.4098 (-1.92756 2.12934)
Norm : 73.0072 (-7.52969 8.44227)
------------------------------------------------------------
#Fit statistic : Chi-Squared 52.38 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.49e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.316e-07 8.650e-09
25- 50 1.328e-07 6.850e-09
50-150 5.453e-08 8.830e-09
15-150 3.190e-07 1.625e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.73274 (-1.74677 7.42377)
R1^2/D10^2 : 66.5088 (-51.2831 2165.35)
kT2 [keV] : 8.14190 (-0.713842 3.00501)
R2^2/D10^2 : 6.08508 (-5.49776 4.15945)
------------------------------------------------------------
#Fit statistic : Chi-Squared 35.99 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.78e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.167e-07 5.064e-08
25- 50 1.459e-07 4.714e-08
50-150 3.717e-08 1.289e-08
15-150 2.998e-07 9.235e-08
Plot creation:
Tue Nov 17 19:24:06 EST 2020