batgrbproduct analysis for trigger=1006917
batgrbproduct Analysis for Trigger=1006917
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): Wed Nov 18 05:10:02 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger1006917/GCN5_download_cron
======================================================================
Trigger: 01006917 Segment: 000
BAT Trigger Time: 627264781.824 [s; MET]
Trigger Stop: 627264782.336 [s; MET]
UTC: 2020-11-17T00:12:35.829360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 85.8264456752716 Dec: 25.5968360195763 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.99
Image Trigger?: NO
Rate S/N Ratio: 16.4012194668567 [ if not an image trigger ]
Image S/N Ratio: 7.99
Flight Position: [ source = BAT ]
RA: 85.8264456752716 Dec: 25.5968360195763 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 85.8427758134653 Dec: 25.4976907154175 [deg; J2000]
{ 05h 43m 22.3s , +25d 29' 51.7" }
+/- 3.09369952260836 [arcmin] (estimated 90% radius based on SNR)
+/- 1.52859646996263 [arcmin] (formal 1-sigma fit error)
SNR: 6.05947972543393
Angular difference between Flight and Ground position is 6.014044 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 575.807999968529 +/- 7.60372221125665
Measured from: 109.796000123024
to: 685.604000091553 [s; relative to TRIGTIME]
T50: 310.575999975204 +/- 2.46301932958064
Measured from: 282.964000105858
to: 593.540000081062 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 585.815999984741
to: 586.815999984741 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.81599998474121
to: 705.65600001812 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 126.580213 98.682206 14.045975 0.407009
0.247990 0.238403 0.174364 0.166826 [error]
Peak 0.293316 0.257661 0.048387 0.007238
0.010624 0.010335 0.006643 0.005956 [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 6.38e-05 3.36e-05 1.10e-05 4.67e-06 1.11e-04 1.13e-04 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 3.26e+00 1.60e+00 4.78e-01 1.81e-01 5.44e+00 5.51e+00 ph/cm2/s
Error 2.30e-01 8.93e-02 4.91e-02 3.33e-02 3.01e-01 3.02e-01 ph/cm2/s
Fluence Cutoff-PL 3.88e-05 4.02e-05 1.00e-05 3.33e-07 8.93e-05 8.93e-05 erg/cm2
Error 2.07e-06 7.48e-07 2.82e-07 5.52e-08 2.46e-06 2.46e-06 erg/cm2
Peak flux Cutoff-PL 2.74e+00 2.01e+00 3.11e-01 5.46e-03 5.07e+00 5.07e+00 ph/cm2/s
Error 2.65e-01 1.30e-01 6.83e-02 5.81e-03 3.09e-01 3.10e-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 3.609 0.000 - - 9.27e-03 0.00e+00 941.690 57
CPL 0.419 0.231 20.9 1.6 5.22e-01 1.51e-01 39.710 56
The chi2 of BB fit is 229.21 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 2.739 0.105 - - 2.37e-02 1.89e-03 107.030 57
CPL -0.149 0.810 25.9 2.8 1.62e+00 2.97e+00 42.760 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: 584.128000 sec.
T50 in the 50-300 keV band: 301.696000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 713.472 -7.816 705.656
T90 575.808 109.796 685.604
T50 310.576 282.964 593.540
Peak 1.000 585.816 586.816
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
85.8428 +25.4977 0.0317 0.3 -159.1 0.6735 6.1 TRIG_01006917
------------------------------------------
Foreground time interval of the image:
-7.816 15.177 (delta_t = 22.993 [sec])
Background time interval of the image:
-29.824 -7.816 (delta_t = 22.008 [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
Multiple GTIs in the spectrum
tstart tstop
-7.816000 36.926000
38.176000 562.476000
563.176000 705.656000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.60852 ( )
Norm@50keV : 9.26565E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 941.69 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.93e-160 with 57 degrees of freedom
Photon flux (15-150 keV) in 711.5 sec: 4.09593 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0.000111037 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-7.816000 36.926000
38.176000 562.476000
563.176000 705.656000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.419396 ( -0.234655 0.226714 )
Epeak [keV] : 20.9453 ( -1.68062 1.5175 )
Norm@50keV : 0.522186 ( -0.127103 0.174613 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 39.71 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.51e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 711.5 sec: 2.97520 ( -0.10759 0.10925 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.93032e-05 ( -2.44329e-06 2.46962e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-7.816000 36.926000
38.176000 562.476000
563.176000 705.656000
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.419514 ( -0.212718 0.250268 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 20.9372 ( -1.67126 1.52408 )
Norm@50keV : 0.522378 ( -0.126625 0.175917 )
------------------------------------------------------------
Photon flux (15-150 keV) in 711.5 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] : 7.62404 ( )
R^2/D10^2 : 3.52921 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 229.21 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.64e-22 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.541e-05 8.076e-07
25- 50 4.083e-05 7.435e-07
50-150 9.127e-06 2.490e-07
15-150 7.536e-05 1.459e-06
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.1657 (-0.342167 0.351897)
Norm : 43.6365 (-1.80616 1.87334)
------------------------------------------------------------
#Fit statistic : Chi-Squared 93.67 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.59e-03 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.640e-05 1.380e-06
25- 50 3.930e-05 7.151e-07
50-150 1.095e-05 3.237e-07
15-150 9.665e-05 1.957e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.92091 (-0.405233 0.416004)
R1^2/D10^2 : 16.7074 (-4.41026 7.00985)
kT2 [keV] : 9.25491 (-0.386541 0.499686)
R2^2/D10^2 : 0.872423 (-0.28886 0.328168)
------------------------------------------------------------
#Fit statistic : Chi-Squared 33.01 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.92e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.761e-05 3.369e-06
25- 50 4.031e-05 2.199e-06
50-150 1.031e-05 7.435e-07
15-150 8.823e-05 5.194e-06
Peak spectrum fit
Power-law model
Time interval is from 585.816 sec. to 586.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.73874 ( -0.103582 0.107137 )
Norm@50keV : 2.37384E-02 ( -0.00188706 0.00188389 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 107.03 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.78e-05 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 5.43666 ( -0.301313 0.301628 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56055e-07 ( -1.47102e-08 1.47809e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 585.816 sec. to 586.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.149240 ( -0.868982 0.751522 )
Epeak [keV] : 25.9028 ( -3.23857 2.30971 )
Norm@50keV : 1.61779 ( -1.61795 4.3199 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.76 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.03e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 5.07241 ( -0.30907 0.30991 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25375e-07 ( -1.3681e-08 1.3959e-08 ) ergs/cm2
Band function
Time interval is from 585.816 sec. to 586.816 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.146360 ( -0.707543 3.08769 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 25.8915 ( -3.23118 2.31704 )
Norm@50keV : 1.61101 ( -1.61101 4.33766 )
------------------------------------------------------------
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] : 7.24866 (-0.343385 0.357298)
R^2/D10^2 : 8.89184 (-1.72246 2.14731)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.03 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.97e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.771e-08 6.030e-09
25- 50 1.138e-07 6.950e-09
50-150 2.136e-08 3.570e-09
15-150 2.128e-07 1.260e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.3052 (-2.43506 2.74922)
Norm : 49.5906 (-5.47547 6.19101)
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.21 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.42e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.377e-08 6.650e-09
25- 50 9.924e-08 5.715e-09
50-150 4.542e-08 7.400e-09
15-150 2.384e-07 1.400e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.79159 (-1.4037 0.97617)
R1^2/D10^2 : 16.5095 (-5.54883 15.8715)
kT2 [keV] : 11.1181 (-6.97059 6.24338)
R2^2/D10^2 : 0.579421 (-0.461937 2.97536)
------------------------------------------------------------
#Fit statistic : Chi-Squared 40.81 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.23e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.481e-08 2.828e-08
25- 50 1.074e-07 4.415e-08
50-150 3.535e-08 1.902e-08
15-150 2.275e-07 8.594e-08
Plot creation:
Wed Nov 18 05:14:26 EST 2020