batgrbproduct analysis for trigger=996184
batgrbproduct Analysis for Trigger=996184
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): Fri Sep 18 15:30:26 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger996184/GCN5_download_cron
======================================================================
Trigger: 00996184 Segment: 000
BAT Trigger Time: 622007573.952 [s; MET]
Trigger Stop: 622007578.048 [s; MET]
UTC: 2020-09-17T03:52:28.303740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 235.753465520776 Dec: -4.69532441409532 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.11
Image Trigger?: NO
Rate S/N Ratio: 14 [ if not an image trigger ]
Image S/N Ratio: 9.11
Flight Position: [ source = BAT ]
RA: 235.753465520776 Dec: -4.69532441409532 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 235.741715036546 Dec: -4.69484282061901 [deg; J2000]
{ 15h 42m 58.0s , -04d 41' 41.4" }
+/- 2.03605390299023 [arcmin] (estimated 90% radius based on SNR)
+/- 0.833292362978815 [arcmin] (formal 1-sigma fit error)
SNR: 11.015161002239
Angular difference between Flight and Ground position is 0.703257 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 19.3919999599457 +/- 2.8976300963817
Measured from: -13.595999956131
to: 5.7960000038147 [s; relative to TRIGTIME]
T50: 12.5479999780655 +/- 5.85326981166328
Measured from: -8.62799990177155
to: 3.92000007629395 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.03999996185303
to: 6.03999996185303 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.7640000581741
to: 6.17599999904633 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.287050 0.244033 0.116112 0.018933
0.035446 0.032181 0.028401 0.027107 [error]
Peak 0.029611 0.029045 0.013882 0.013867
0.007770 0.007221 0.005957 0.005829 [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 8.13e-08 9.56e-08 8.10e-08 1.16e-07 3.00e-07 3.74e-07 erg/cm2
Error 1.54e-08 1.49e-08 2.45e-08 6.81e-08 5.57e-08 9.91e-08 erg/cm2
Peak flux Power-law 2.46e-01 1.99e-01 1.08e-01 8.66e-02 5.92e-01 6.40e-01 ph/cm2/s
Error 1.00e-01 5.51e-02 4.82e-02 7.84e-02 1.65e-01 1.81e-01 ph/cm2/s
Fluence Cutoff-PL 8.00e-08 1.01e-07 7.26e-08 3.63e-08 2.77e-07 2.90e-07 erg/cm2
Error 1.61e-08 1.99e-08 3.37e-08 9.37e-08 6.95e-08 1.28e-07 erg/cm2
Peak flux Cutoff-PL 2.46e-01 1.99e-01 1.08e-01 8.55e-02 5.92e-01 6.39e-01 ph/cm2/s
Error 1.00e-01 9.07e-02 7.00e-02 7.77e-02 1.64e-01 2.47e-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 2.239 0.306 - - 1.44e-03 3.16e-04 42.530 57
CPL 1.696 1.172 19.8 0.0 3.21e-03 0.00e+00 42.020 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.874 0.536 - - 4.17e-03 1.42e-03 66.810 57
CPL -7.258 0.000 28.0 0.0 1.53e+04 0.00e+00 65.340 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 21.940 -15.764 6.176
T90 19.392 -13.596 5.796
T50 12.548 -8.628 3.920
Peak 1.000 5.040 6.040
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
235.7417 -4.6948 0.0175 12.5 142.8 0.7438 11.0 TRIG_00996184
------------------------------------------
Foreground time interval of the image:
-15.764 6.176 (delta_t = 21.940 [sec])
Background time interval of the image:
-76.851 -15.764 (delta_t = 61.087 [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 -15.764 sec. to 6.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23886 ( -0.292848 0.319981 )
Norm@50keV : 1.44362E-03 ( -0.000319095 0.000313538 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.53 using 59 PHA bins.
# Reduced chi-squared = 0.7461 for 57 degrees of freedom
# Null hypothesis probability = 9.232101e-01
Photon flux (15-150 keV) in 21.94 sec: 0.243986 ( -0.0351639 0.0351649 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99525e-07 ( -5.42291e-08 5.71037e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.764 sec. to 6.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69561 ( -1.97386 0.370995 )
Epeak [keV] : 19.8061 ( )
Norm@50keV : 3.21136E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.02 using 59 PHA bins.
# Reduced chi-squared = 0.7504 for 56 degrees of freedom
# Null hypothesis probability = 9.170763e-01
Photon flux (15-150 keV) in 21.94 sec: 0.238741 ( -0.036763 0.036368 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76799e-07 ( -6.51598e-08 7.38457e-08 ) ergs/cm2
Band function
Time interval is from -15.764 sec. to 6.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.58644 ( -4.58644 -4.58644 )
beta : -2.56166 ( -0.58371 0.424682 )
Epeak [keV] : 22.8257 ( -4.90879 4.05146 )
Norm@50keV : 263.191 ( -37.5925 2.82361e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.21 using 59 PHA bins.
# Reduced chi-squared = 0.7310 for 55 degrees of freedom
# Null hypothesis probability = 9.326968e-01
Photon flux (15-150 keV) in 21.94 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] : 7.38180 (-1.10755 1.36197)
R^2/D10^2 : 0.366772 (-0.183637 0.353116)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.54 using 59 PHA bins.
# Reduced chi-squared = 0.8341 for 57 degrees of freedom
# Null hypothesis probability = 8.096891e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.419e-08 1.974e-08
25- 50 1.124e-07 3.008e-08
50-150 2.248e-08 1.142e-08
15-150 2.090e-07 4.684e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.7497 (-13.4374 25.2349)
Norm : 1.55249 (-0.396625 0.591352)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.14 using 59 PHA bins.
# Reduced chi-squared = 0.7394 for 57 degrees of freedom
# Null hypothesis probability = 9.293383e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.870e-08 1.639e-08
25- 50 1.044e-07 2.111e-08
50-150 8.239e-08 3.820e-08
15-150 2.655e-07 5.758e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.69657 (-1.55375 1.58446)
R1^2/D10^2 : 0.865701 (-0.460183 1.56164)
kT2 [keV] : 21.0654 (-11.1359 -23.2293)
R2^2/D10^2 : 3.03835E-03 (-0.00229748 0.0205)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.87 using 59 PHA bins.
# Reduced chi-squared = 0.7249 for 55 degrees of freedom
# Null hypothesis probability = 9.377519e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.130e-08 4.633e-08
25- 50 9.604e-08 5.071e-08
50-150 1.001e-07 6.409e-08
15-150 2.774e-07 1.448e-07
Peak spectrum fit
Power-law model
Time interval is from 5.040 sec. to 6.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87375 ( -0.522636 0.549133 )
Norm@50keV : 4.16998E-03 ( -0.00144475 0.00138528 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.81 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 57 degrees of freedom
# Null hypothesis probability = 1.754988e-01
Photon flux (15-150 keV) in 1 sec: 0.591878 ( -0.164494 0.164556 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83348e-08 ( -1.25372e-08 1.34171e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.040 sec. to 6.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -7.25799 ( )
Epeak [keV] : 27.9955 ( )
Norm@50keV : 1.52603E+04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.34 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 56 degrees of freedom
# Null hypothesis probability = 1.841307e-01
Photon flux (15-150 keV) in 1 sec: 0.591732 ( -0.164237 0.164436 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.16145e-16 ( 0 0 ) ergs/cm2
Band function
Time interval is from 5.040 sec. to 6.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97400 ( -5.61805 -4.974 )
beta : -2.66909 ( 2.66909 0.908801 )
Epeak [keV] : 26.8636 ( -7.05618 6.28689 )
Norm@50keV : 455.054 ( -119.686 2688.8 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.87 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 55 degrees of freedom
# Null hypothesis probability = 2.176592e-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] : 7.67791 (-1.74099 2.64943)
R^2/D10^2 : 0.792854 (-0.792854 1.46312)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.62 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 57 degrees of freedom
# Null hypothesis probability = 1.796778e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.184e-09 4.812e-09
25- 50 1.332e-08 7.570e-09
50-150 3.049e-09 2.538e-09
15-150 2.455e-08 1.539e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 66.5134 (-39.0333 -66.565)
Norm : 2.96862 (-1.13045 2.19858)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.97 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.720473e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.571e-09 4.542e-09
25- 50 1.188e-08 7.100e-09
50-150 1.468e-08 1.142e-08
15-150 3.413e-08 2.181e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.83864 (-1.58028 1.58275)
R1^2/D10^2 : 1.16351 (-0.656487 2.05838)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 8.92397E-05 (-5.57074e-05 -8.9135e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.23 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.22 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 55 degrees of freedom
# Reduced chi-squared = 1.095 for 55 degrees of freedom
# Null hypothesis probability = 2.921750e-01
# Null hypothesis probability = 2.926711e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.514e-09 4.954e-09
25- 50 1.232e-08 7.520e-09
50-150 2.458e-08 3.591e-09
15-150 4.542e-08 1.525e-08
Plot creation:
Fri Sep 18 15:35:01 EDT 2020