batgrbproduct analysis for trigger=997453
batgrbproduct Analysis for Trigger=997453
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 Sep 26 18:39:29 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger997453/GCN5_download_cron
======================================================================
Trigger: 00997453 Segment: 000
BAT Trigger Time: 622763462.72 [s; MET]
Trigger Stop: 622763463.744 [s; MET]
UTC: 2020-09-25T21:50:37.022000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 246.851224404343 Dec: 78.3941848869908 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.68
Image Trigger?: NO
Rate S/N Ratio: 11.8743420870379 [ if not an image trigger ]
Image S/N Ratio: 7.68
Flight Position: [ source = BAT ]
RA: 246.851224404343 Dec: 78.3941848869908 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 246.892318705906 Dec: 78.392656882136 [deg; J2000]
{ 16h 27m 34.2s , +78d 23' 33.6" }
+/- 1.2297472089438 [arcmin] (estimated 90% radius based on SNR)
+/- 0.442211535191318 [arcmin] (formal 1-sigma fit error)
SNR: 22.6365391460665
Angular difference between Flight and Ground position is 0.504468 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 18.2519999742508 +/- 0.974966696361147
Measured from: 0.660000085830688
to: 18.9120000600815 [s; relative to TRIGTIME]
T50: 5.08399999141693 +/- 1.89864154190994
Measured from: 2.80000007152557
to: 7.8840000629425 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.38399994373322
to: 5.38399994373322 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.199999928474426
to: 19.5920000076294 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.667923 0.732180 0.363213 0.044562
0.043092 0.044464 0.038541 0.034157 [error]
Peak 0.133236 0.119588 0.080585 0.001795
0.011454 0.012531 0.010512 0.008395 [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 2.24e-07 3.02e-07 3.00e-07 5.36e-07 1.00e-06 1.36e-06 erg/cm2
Error 2.35e-08 2.23e-08 3.74e-08 1.32e-07 8.60e-08 1.73e-07 erg/cm2
Peak flux Power-law 1.32e+00 9.83e-01 4.87e-01 3.44e-01 2.95e+00 3.13e+00 ph/cm2/s
Error 1.93e-01 1.04e-01 8.64e-02 1.14e-01 3.10e-01 3.33e-01 ph/cm2/s
Fluence Cutoff-PL 2.10e-07 3.27e-07 2.89e-07 1.71e-07 9.32e-07 9.98e-07 erg/cm2
Error 2.63e-08 2.97e-08 4.35e-08 1.67e-07 9.78e-08 1.97e-07 erg/cm2
Peak flux Cutoff-PL 1.24e+00 1.06e+00 4.95e-01 1.61e-01 2.90e+00 2.95e+00 ph/cm2/s
Error 2.17e-01 1.35e-01 9.58e-02 1.51e-01 3.14e-01 3.45e-01 ph/cm2/s
Fluence Band 2.08e-07 3.26e-07 2.89e-07 1.74e-07 9.31e-07 1.00e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.25e+00 1.04e+00 5.04e-01 2.13e-01 2.93e+00 3.01e+00 ph/cm2/s
Error 2.20e-01 -------- -------- -------- 3.22e-01 3.62e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.011 0.137 - - 5.59e-03 5.06e-04 61.000 57
CPL 1.307 0.600 41.0 14.2 1.42e-02 1.31e-02 56.180 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.013 0.193 - - 1.96e-02 2.64e-03 66.050 57
CPL 1.382 0.731 42.7 0.0 4.45e-02 0.00e+00 63.500 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: 4.928000 sec.
T50 in the 50-300 keV band: 3.392000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.392 0.200 19.592
T90 18.252 0.660 18.912
T50 5.084 2.800 7.884
Peak 1.000 4.384 5.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
246.8923 +78.3927 0.0085 29.1 126.3 1.4038 22.6 TRIG_00997453
------------------------------------------
Foreground time interval of the image:
0.200 8.181 (delta_t = 7.981 [sec])
Background time interval of the image:
-239.720 -101.670 (delta_t = 138.050 [sec])
-100.720 0.200 (delta_t = 100.920 [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 0.200 sec. to 19.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01090 ( -0.134898 0.139792 )
Norm@50keV : 5.59444E-03 ( -0.000510036 0.000502575 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.00 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.342015e-01
Photon flux (15-150 keV) in 19.39 sec: 0.843398 ( -0.0615951 0.061624 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00094e-06 ( -8.54298e-08 8.66582e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.200 sec. to 19.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30736 ( -0.642224 0.55723 )
Epeak [keV] : 41.0412 ( -14.0659 14.3629 )
Norm@50keV : 1.42078E-02 ( -0.00729935 0.0189958 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.18 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 56 degrees of freedom
# Null hypothesis probability = 4.680376e-01
Photon flux (15-150 keV) in 19.39 sec: 0.818761 ( -0.06422 0.064307 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.32463e-07 ( -9.57459e-08 9.99283e-08 ) ergs/cm2
Band function
Time interval is from 0.200 sec. to 19.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.89584 ( -6.00943 -4.28026 )
beta : -2.20210 ( -0.230851 0.191067 )
Epeak [keV] : 25.1206 ( -3.8109 3.13135 )
Norm@50keV : 24.9302 ( -24.9299 408.634 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.94 using 59 PHA bins.
# Reduced chi-squared = 0.9989 for 55 degrees of freedom
# Null hypothesis probability = 4.770329e-01
Photon flux (15-150 keV) in 19.39 sec: 0.824497 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.31276e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.93954 (-0.875801 0.962764)
R^2/D10^2 : 0.395483 (-0.118711 0.169837)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.30 using 59 PHA bins.
# Reduced chi-squared = 1.584 for 57 degrees of freedom
# Null hypothesis probability = 3.266231e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.540e-07 2.008e-08
25- 50 3.795e-07 3.170e-08
50-150 1.946e-07 3.910e-08
15-150 7.281e-07 6.709e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 64.6205 (-13.1225 18.2324)
Norm : 4.27029 (-0.503141 0.548067)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.15 using 59 PHA bins.
# Reduced chi-squared = 0.9851 for 57 degrees of freedom
# Null hypothesis probability = 5.069197e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.104e-07 2.199e-08
25- 50 3.274e-07 2.356e-08
50-150 3.955e-07 7.106e-08
15-150 9.333e-07 8.793e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.56698 (-1.05444 1.18583)
R1^2/D10^2 : 2.48134 (-1.22691 3.00469)
kT2 [keV] : 17.6318 (-3.27277 5.25868)
R2^2/D10^2 : 3.08488E-02 (-0.0203942 0.0431194)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.41 using 59 PHA bins.
# Reduced chi-squared = 0.9711 for 55 degrees of freedom
# Null hypothesis probability = 5.354982e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.139e-07 6.843e-08
25- 50 3.195e-07 9.626e-08
50-150 3.928e-07 1.995e-07
15-150 9.262e-07 3.195e-07
Peak spectrum fit
Power-law model
Time interval is from 4.384 sec. to 5.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01332 ( -0.186992 0.199944 )
Norm@50keV : 1.95566E-02 ( -0.00267042 0.00260506 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.05 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.927138e-01
Photon flux (15-150 keV) in 1 sec: 2.95161 ( -0.310273 0.310295 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80497e-07 ( -2.28911e-08 2.32809e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.384 sec. to 5.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38212 ( -0.785481 0.676014 )
Epeak [keV] : 42.7316 ( )
Norm@50keV : 4.44842E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.50 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 56 degrees of freedom
# Null hypothesis probability = 2.291646e-01
Photon flux (15-150 keV) in 1 sec: 2.90304 ( -0.31356 0.31386 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72866e-07 ( -2.3624e-08 2.4458e-08 ) ergs/cm2
Band function
Time interval is from 4.384 sec. to 5.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.38126 ( -3.72022 0.746796 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 42.7203 ( -32.4624 -42.7203 )
Norm@50keV : 4.45296E-02 ( -0.0212332 0.0777682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.50 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 55 degrees of freedom
# Null hypothesis probability = 2.018953e-01
Photon flux (15-150 keV) in 1 sec: 2.92850 ( 4.0715 -0.3444 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72509e-07 ( -1.72502e-07 -2.3206e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.5921 (-1.46164 1.63817)
R^2/D10^2 : 1.11126 (-0.459592 0.826179)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.71 using 59 PHA bins.
# Reduced chi-squared = 1.539 for 57 degrees of freedom
# Null hypothesis probability = 5.564092e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.583e-08 4.985e-09
25- 50 6.950e-08 9.170e-09
50-150 4.275e-08 1.080e-08
15-150 1.381e-07 2.080e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 67.6050 (-18.237 28.8391)
Norm : 14.8145 (-2.29484 2.65836)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.59 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 57 degrees of freedom
# Null hypothesis probability = 2.557468e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.786e-08 5.285e-09
25- 50 5.966e-08 7.150e-09
50-150 7.465e-08 2.084e-08
15-150 1.722e-07 2.570e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.53426 (-1.01583 1.25124)
R1^2/D10^2 : 19.7538 (-12.4777 42.0907)
kT2 [keV] : 16.9187 (-2.98878 4.11844)
R2^2/D10^2 : 0.147948 (-0.0868203 0.147483)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.86 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 55 degrees of freedom
# Null hypothesis probability = 3.362331e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.058e-08 1.836e-08
25- 50 5.433e-08 1.962e-08
50-150 7.808e-08 4.027e-08
15-150 1.730e-07 6.518e-08
Plot creation:
Sat Sep 26 18:44:36 EDT 2020