batgrbproduct analysis for trigger=1069551
batgrbproduct Analysis for Trigger=1069551
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): Sat Aug 21 15:56:31 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1069551/GCN5_download_cron
======================================================================
Trigger: 01069551 Segment: 000
BAT Trigger Time: 651173908.288 [s; MET]
Trigger Stop: 651173924.672 [s; MET]
UTC: 2021-08-20T17:38:00.705080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 20.6292412647972 Dec: 4.6320288630948 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.81
Image Trigger?: NO
Rate S/N Ratio: 8.54400374531753 [ if not an image trigger ]
Image S/N Ratio: 7.81
Flight Position: [ source = BAT ]
RA: 20.6292412647972 Dec: 4.6320288630948 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 20.6224484168984 Dec: 4.64183781090373 [deg; J2000]
{ 01h 22m 29.4s , +04d 38' 30.6" }
+/- 3.42571939193804 [arcmin] (estimated 90% radius based on SNR)
+/- 1.73529119159819 [arcmin] (formal 1-sigma fit error)
SNR: 5.23826248778314
Angular difference between Flight and Ground position is 0.715125 arcmin
Partial Coding Fraction: 0.484375 [ including projection effects ]
Duration
T90: 196.824000000954 +/- 51.3995801375516
Measured from: 2.96400010585785
to: 199.788000106812 [s; relative to TRIGTIME]
T50: 74.9119999408722 +/- 73.5153543713312
Measured from: 72.8840001821518
to: 147.796000123024 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.9160000085831
to: 11.9160000085831 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.784000039100647
to: 258.972000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.180131 1.359100 0.244970 -0.021838
0.119136 0.124069 0.113625 0.113951 [error]
Peak 0.051693 0.023854 0.012947 0.005732
0.009850 0.010131 0.009016 0.008927 [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 4.10e-07 4.75e-07 3.95e-07 5.54e-07 1.48e-06 1.83e-06 erg/cm2
Error 5.82e-08 5.97e-08 9.24e-08 2.41e-07 2.18e-07 3.69e-07 erg/cm2
Peak flux Power-law 4.03e-01 2.69e-01 1.17e-01 7.02e-02 8.25e-01 8.60e-01 ph/cm2/s
Error 1.71e-01 9.12e-02 1.01e-01 1.07e-01 2.41e-01 2.63e-01 ph/cm2/s
Fluence Cutoff-PL 3.63e-07 6.18e-07 2.38e-07 1.04e-08 1.23e-06 1.23e-06 erg/cm2
Error 6.68e-08 8.81e-08 1.15e-07 2.96e-08 1.79e-07 1.81e-07 erg/cm2
Peak flux Cutoff-PL 4.06e-01 2.68e-01 1.15e-01 6.76e-02 8.24e-01 8.57e-01 ph/cm2/s
Error 1.70e-01 9.11e-02 1.01e-01 7.93e-02 2.41e-01 2.59e-01 ph/cm2/s
Fluence Band 3.66e-07 6.42e-07 2.48e-07 1.17e-08 1.28e-06 1.28e-06 erg/cm2
Error 6.63e-08 8.79e-08 -------- -------- -------- -------- 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 2.264 0.224 - - 6.04e-04 1.04e-04 56.000 57
CPL -0.617 1.604 32.1 4.6 4.02e-02 3.18e-01 40.180 56
The chi2 of BB fit is 41.08 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 2.199 0.853 - - 4.98e-03 2.60e-03 71.110 57
CPL 2.132 0.855 55.5 0.0 4.33e-03 0.00e+00 70.780 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 258.188 0.784 258.972
T90 196.824 2.964 199.788
T50 74.912 72.884 147.796
Peak 1.000 10.916 11.916
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
20.6224 +4.6418 0.0367 28.7 -80.7 0.8576 5.2 TRIG_01069551
------------------------------------------
Foreground time interval of the image:
0.784 63.413 (delta_t = 62.629 [sec])
Background time interval of the image:
-239.288 0.784 (delta_t = 240.072 [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 0.784 sec. to 258.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.26405 ( -0.215359 0.232979 )
Norm@50keV : 6.03611E-04 ( -0.000104761 0.000104146 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.00 using 59 PHA bins.
# Reduced chi-squared = 0.9824 for 57 degrees of freedom
# Null hypothesis probability = 5.127088e-01
Photon flux (15-150 keV) in 258.2 sec: 0.103416 ( -0.0119464 0.01195 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47968e-06 ( -2.13391e-07 2.22231e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.784 sec. to 258.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.617046 ( -1.81904 1.38981 )
Epeak [keV] : 32.0696 ( -4.75226 4.37715 )
Norm@50keV : 4.01998E-02 ( -0.0422778 0.593177 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.18 using 59 PHA bins.
# Reduced chi-squared = 0.7175 for 56 degrees of freedom
# Null hypothesis probability = 9.451940e-01
Photon flux (15-150 keV) in 258.2 sec: 9.77736E-02 ( -0.0116278 0.0117124 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22908e-06 ( -1.69377e-07 1.89093e-07 ) ergs/cm2
Band function
Time interval is from 0.784 sec. to 258.972 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.638926 ( -1.32732 1.90407 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 32.0970 ( -3.88901 4.36522 )
Norm@50keV : 4.15511E-02 ( -0.041547 0.595684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.18 using 59 PHA bins.
# Reduced chi-squared = 0.7305 for 55 degrees of freedom
# Null hypothesis probability = 9.331450e-01
Photon flux (15-150 keV) in 258.2 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27674e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.33015 (-0.874861 0.970462)
R^2/D10^2 : 0.102875 (-0.0366609 0.057136)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.08 using 59 PHA bins.
# Reduced chi-squared = 0.7207 for 57 degrees of freedom
# Null hypothesis probability = 9.445629e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.429e-07 6.184e-08
25- 50 6.430e-07 9.579e-08
50-150 1.925e-07 6.897e-08
15-150 1.178e-06 1.778e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 39.5444 (-9.23173 13.5111)
Norm : 0.688119 (-0.129612 0.163501)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.064e-07 6.274e-08
25- 50 5.320e-07 7.501e-08
50-150 4.065e-07 1.510e-07
15-150 1.345e-06 2.497e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.326818 (-4.50655 -4.50655)
R1^2/D10^2 : 2.72738E+15 (-3.04362e+15 8.69155e+20)
kT2 [keV] : 8.49845 (-0.906235 1.00761)
R2^2/D10^2 : 9.37803E-02 (-0.0339788 0.0485005)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.647e-07 1.896e-07
25- 50 6.171e-07 3.299e-07
50-150 2.423e-07 1.420e-07
15-150 1.224e-06 6.610e-07
Peak spectrum fit
Power-law model
Time interval is from 10.916 sec. to 11.916 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19868 ( -0.704499 1.00118 )
Norm@50keV : 4.98468E-03 ( -0.00281786 0.00239004 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.11 using 59 PHA bins.
# Reduced chi-squared = 1.247 for 57 degrees of freedom
# Null hypothesis probability = 9.904691e-02
Photon flux (15-150 keV) in 1 sec: 0.824608 ( -0.241555 0.241351 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.68233e-08 ( -1.94999e-08 2.11618e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.916 sec. to 11.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13195 ( -0.877944 0.832948 )
Epeak [keV] : 55.5323 ( )
Norm@50keV : 4.33129E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.78 using 59 PHA bins.
# Reduced chi-squared = 1.264 for 56 degrees of freedom
# Null hypothesis probability = 8.825721e-02
Photon flux (15-150 keV) in 1 sec: 0.823575 ( -0.241036 0.239985 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.63069e-08 ( -1.89294e-08 2.16862e-08 ) ergs/cm2
Band function
Time interval is from 10.916 sec. to 11.916 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.99928 ( 9.99928 9.99928 )
beta : -2.19983 ( -1.00056 0.705201 )
Epeak [keV] : 10.9711 ( -10.9711 -10.9711 )
Norm@50keV : 0.677046 ( -0.382906 0.324921 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.11 using 59 PHA bins.
# Reduced chi-squared = 1.293 for 55 degrees of freedom
# Null hypothesis probability = 7.086658e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.91991 (-4.09964 5.29065)
R^2/D10^2 : 1.46249 (-1.4102 97.5107)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.112e-08 7.115e-09
25- 50 1.489e-08 9.785e-09
50-150 2.366e-09 2.069e-09
15-150 2.837e-08 1.764e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 56.1710 (-41.6198 -56.9843)
Norm : 4.32077 (-1.89642 -4.27553)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.073e-08 6.388e-09
25- 50 1.600e-08 9.155e-09
50-150 1.721e-08 1.277e-08
15-150 4.395e-08 2.810e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.30518 (-1.72122 3.46454)
R1^2/D10^2 : 39.1731 (-37.144 195.177)
kT2 [keV] : 34.7931 (-24.8537 -35.0813)
R2^2/D10^2 : 4.22561E-03 (-0.00403317 0.23168)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.377e-08 7.900e-09
25- 50 7.379e-09 3.816e-09
50-150 3.774e-08 2.368e-08
15-150 5.889e-08 2.969e-08
Plot creation:
Sat Aug 21 16:01:48 EDT 2021