batgrbproduct analysis for trigger=998344
batgrbproduct Analysis for Trigger=998344
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 Oct 1 15:50:41 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger998344/batgroup_hand_proc
======================================================================
Trigger: 00998344 Segment: 000
BAT Trigger Time: 623239157.376 [s; MET]
Trigger Stop: 623239165.568 [s; MET]
UTC: 2020-10-01T09:58:51.646720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 110.070324685104 Dec: -2.21023113971737 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.08
Image Trigger?: NO
Rate S/N Ratio: 14 [ if not an image trigger ]
Image S/N Ratio: 9.08
Flight Position: [ source = BAT ]
RA: 110.070324685104 Dec: -2.21023113971737 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 110.049380079501 Dec: -2.21372848327979 [deg; J2000]
{ 07h 20m 11.9s , -02d 12' 49.4" }
+/- 1.88863307025383 [arcmin] (estimated 90% radius based on SNR)
+/- 0.689399277903993 [arcmin] (formal 1-sigma fit error)
SNR: 12.2637086069715
Angular difference between Flight and Ground position is 1.273152 arcmin
Partial Coding Fraction: 0.3867188 [ including projection effects ]
Duration
T90: 15.2320001125336 +/- 2.89918053084441
Measured from: -3.15200006961823
to: 12.0800000429153 [s; relative to TRIGTIME]
T50: 8.32000005245209 +/- 2.20058181773198
Measured from: 1.75999999046326
to: 10.0800000429153 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.7879999876022
to: 11.7879999876022 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.01600003242493
to: 12.9759999513626 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.117511 0.393868 0.395692 0.135223
0.045197 0.048463 0.043410 0.038141 [error]
Peak 0.016570 0.057616 0.043998 0.018686
0.011442 0.011938 0.010710 0.009687 [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 5.53e-08 1.41e-07 2.90e-07 1.50e-06 7.82e-07 1.99e-06 erg/cm2
Error 1.53e-08 2.37e-08 3.97e-08 4.78e-07 1.06e-07 4.94e-07 erg/cm2
Peak flux Power-law 2.89e-01 3.18e-01 2.49e-01 3.22e-01 9.77e-01 1.18e+00 ph/cm2/s
Error 1.33e-01 9.67e-02 8.00e-02 2.02e-01 2.77e-01 3.33e-01 ph/cm2/s
Fluence Cutoff-PL 4.46e-08 1.47e-07 3.15e-07 6.33e-07 7.57e-07 1.14e-06 erg/cm2
Error 1.92e-08 2.68e-08 5.07e-08 5.10e-07 1.13e-07 7.04e-07 erg/cm2
Peak flux Cutoff-PL 1.23e-01 4.03e-01 3.01e-01 2.47e-02 8.51e-01 8.53e-01 ph/cm2/s
Error 1.56e-01 1.43e-01 1.22e-01 9.22e-02 3.01e-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 0.964 0.227 - - 4.20e-03 5.63e-04 62.180 57
CPL 0.179 1.041 137.1 -42.4 9.12e-03 1.21e-02 60.250 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.352 0.430 - - 8.10e-03 2.25e-03 66.650 57
CPL -2.596 0.342 58.2 29.4 6.80e-01 1.53e+03 61.800 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: 16.704000 sec.
T50 in the 50-300 keV band: 8.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 16.992 -4.016 12.976
T90 15.232 -3.152 12.080
T50 8.320 1.760 10.080
Peak 1.000 10.788 11.788
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
110.0494 -2.2137 0.0157 30.1 83.9 1.1430 12.3 TRIG_00998344
------------------------------------------
Foreground time interval of the image:
-4.016 12.976 (delta_t = 16.992 [sec])
Background time interval of the image:
-129.275 -4.016 (delta_t = 125.259 [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 -4.016 sec. to 12.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.964482 ( -0.232358 0.220712 )
Norm@50keV : 4.20067E-03 ( -0.000566386 0.000560561 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.18 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 57 degrees of freedom
# Null hypothesis probability = 2.970642e-01
Photon flux (15-150 keV) in 16.99 sec: 0.482849 ( -0.0657494 0.0661524 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.81691e-07 ( -1.05549e-07 1.06046e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.016 sec. to 12.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.178653 ( -1.21116 0.869894 )
Epeak [keV] : 137.055 ( -52.2851 -137.055 )
Norm@50keV : 9.12045E-03 ( -0.00519571 0.018991 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.25 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 56 degrees of freedom
# Null hypothesis probability = 3.248061e-01
Photon flux (15-150 keV) in 16.99 sec: 0.466729 ( -0.068737 0.069052 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.56543e-07 ( -1.13836e-07 1.12304e-07 ) ergs/cm2
Band function
Time interval is from -4.016 sec. to 12.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.848652 ( 0.848652 0.848652 )
beta : -0.964496 ( -0.220618 0.232182 )
Epeak [keV] : 26.9853 ( -26.9853 -26.9853 )
Norm@50keV : 6.60988E-03 ( -0.00274293 228833 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.18 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 55 degrees of freedom
# Null hypothesis probability = 2.359231e-01
Photon flux (15-150 keV) in 16.99 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] : 22.6678 (-3.46865 4.51036)
R^2/D10^2 : 1.60603E-02 (-0.00700694 0.0113951)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.57 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 57 degrees of freedom
# Null hypothesis probability = 2.291107e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.559e-08 7.347e-09
25- 50 1.377e-07 3.395e-08
50-150 5.286e-07 1.161e-07
15-150 6.919e-07 1.271e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-27.9028 -200)
Norm : 2.01645 (-0.274541 0.274541)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.66 using 59 PHA bins.
# Reduced chi-squared = 1.415 for 57 degrees of freedom
# Null hypothesis probability = 2.127643e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.527e-08 4.780e-08
25- 50 1.640e-07 9.132e-08
50-150 3.597e-07 1.969e-07
15-150 6.091e-07 3.330e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.15208 (-0.93601 1.32046)
R1^2/D10^2 : 3.43709E+04 (-34356.2 0)
kT2 [keV] : 23.3903 (-3.6488 4.85054)
R2^2/D10^2 : 1.43892E-02 (-0.00643364 0.0104887)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.14 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 55 degrees of freedom
# Null hypothesis probability = 2.951742e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.471e-08 7.869e-09
25- 50 1.317e-07 2.964e-08
50-150 5.377e-07 1.336e-07
15-150 7.040e-07 1.511e-07
Peak spectrum fit
Power-law model
Time interval is from 10.788 sec. to 11.788 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35185 ( -0.430617 0.429973 )
Norm@50keV : 8.10376E-03 ( -0.00225388 0.00224971 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.65 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 57 degrees of freedom
# Null hypothesis probability = 1.790929e-01
Photon flux (15-150 keV) in 1 sec: 0.976684 ( -0.27588 0.277312 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.91081e-08 ( -2.35138e-08 2.39544e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.788 sec. to 11.788 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.59602 ( 2.31831 3.0015 )
Epeak [keV] : 58.2367 ( -12.4486 46.4176 )
Norm@50keV : 0.679508 ( -0.744278 3061.12 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.80 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 56 degrees of freedom
# Null hypothesis probability = 2.766223e-01
Photon flux (15-150 keV) in 1 sec: 0.850791 ( -0.298032 0.304349 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.45043e-08 ( -2.34941e-08 2.68837e-08 ) ergs/cm2
Band function
Time interval is from 10.788 sec. to 11.788 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93672 ( -5.21745 -4.93672 )
beta : -3.12600 ( 3.126 1.35085 )
Epeak [keV] : 51.9602 ( -11.9806 10.3506 )
Norm@50keV : 11.3008 ( -2.90433 42.9702 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.02 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 55 degrees of freedom
# Null hypothesis probability = 2.684413e-01
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] : 15.7862 (-3.39522 4.80552)
R^2/D10^2 : 0.107556 (-0.0662768 0.142772)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.03 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 57 degrees of freedom
# Null hypothesis probability = 3.015793e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.558e-09 2.908e-09
25- 50 2.312e-08 1.233e-08
50-150 4.006e-08 2.188e-08
15-150 6.874e-08 3.462e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-111.884 -199.363)
Norm : 4.10411 (-1.13089 1.13089)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.34 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 57 degrees of freedom
# Null hypothesis probability = 1.860790e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.022e-08 6.190e-09
25- 50 1.966e-08 1.181e-08
50-150 4.311e-08 2.616e-08
15-150 7.299e-08 4.357e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.16194 (-1.15505 4.04657)
R1^2/D10^2 : 4.66639E+04 (-53075.3 3.8155e+09)
kT2 [keV] : 16.1641 (-3.53943 5.1471)
R2^2/D10^2 : 9.74658E-02 (-0.0616203 0.124296)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.30 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 55 degrees of freedom
# Null hypothesis probability = 2.604653e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.216e-09 3.323e-09
25- 50 2.230e-08 9.900e-09
50-150 4.088e-08 2.576e-08
15-150 6.939e-08 3.400e-08
Plot creation:
Thu Oct 1 18:35:26 EDT 2020