batgrbproduct analysis for trigger=996503
batgrbproduct Analysis for Trigger=996503
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): Sun Sep 20 14:11:21 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger996503/GCN5_download_cron
======================================================================
Trigger: 00996503 Segment: 000
BAT Trigger Time: 622173166.592 [s; MET]
Trigger Stop: 622173170.688 [s; MET]
UTC: 2020-09-19T01:52:20.932840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 168.915726722106 Dec: 32.4569651703903 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.51
Image Trigger?: NO
Rate S/N Ratio: 14.456832294801 [ if not an image trigger ]
Image S/N Ratio: 9.51
Flight Position: [ source = BAT ]
RA: 168.915726722106 Dec: 32.4569651703903 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 168.898582929462 Dec: 32.4560646374608 [deg; J2000]
{ 11h 15m 35.7s , +32d 27' 21.8" }
+/- 1.31113690529182 [arcmin] (estimated 90% radius based on SNR)
+/- 0.449263892350658 [arcmin] (formal 1-sigma fit error)
SNR: 20.6561676002
Angular difference between Flight and Ground position is 0.869635 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 75.9839999675751 +/- 6.85510670997012
Measured from: -57.1559998989105
to: 18.8280000686646 [s; relative to TRIGTIME]
T50: 26.3919998407364 +/- 8.42305872628388
Measured from: -20.5679998397827
to: 5.82400000095367 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.30400002002716
to: 5.30400002002716 [s; relative to TRIGTIME]
Total Fluence
Measured from: -61.472000002861
to: 24.5360000133514 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.346286 1.382634 0.559614 0.238134
0.077959 0.079906 0.070401 0.066285 [error]
Peak 0.039805 0.068609 0.024084 0.020296
0.009072 0.009065 0.007639 0.007219 [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 4.35e-07 5.45e-07 4.96e-07 7.88e-07 1.75e-06 2.26e-06 erg/cm2
Error 4.42e-08 3.96e-08 6.68e-08 2.08e-07 1.51e-07 2.84e-07 erg/cm2
Peak flux Power-law 4.30e-01 3.91e-01 2.45e-01 2.35e-01 1.16e+00 1.30e+00 ph/cm2/s
Error 1.21e-01 7.21e-02 6.15e-02 1.16e-01 2.13e-01 2.39e-01 ph/cm2/s
Fluence Cutoff-PL 4.27e-07 5.64e-07 4.78e-07 4.12e-07 1.67e-06 1.88e-06 erg/cm2
Error 4.72e-08 4.04e-08 8.13e-08 4.84e-07 1.96e-07 4.91e-07 erg/cm2
Peak flux Cutoff-PL 4.09e-01 4.33e-01 2.39e-01 7.88e-02 1.14e+00 1.16e+00 ph/cm2/s
Error 1.33e-01 1.24e-01 9.18e-02 1.76e-01 2.26e-01 3.00e-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 2.134 0.145 - - 2.18e-03 2.10e-04 62.410 57
CPL 1.825 0.461 21.9 0.0 3.35e-03 0.00e+00 61.580 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.673 0.310 - - 8.85e-03 1.75e-03 59.690 57
CPL 0.881 2.113 57.1 0.0 2.63e-02 0.00e+00 59.200 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: 36.608000 sec.
T50 in the 50-300 keV band: 11.264000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 86.008 -61.472 24.536
T90 75.984 -57.156 18.828
T50 26.392 -20.568 5.824
Peak 1.000 4.304 5.304
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
168.8986 +32.4561 0.0093 25.3 -121.0 3.6354 20.7 TRIG_00996503
------------------------------------------
Foreground time interval of the image:
-61.472 24.536 (delta_t = 86.008 [sec])
Background time interval of the image:
-239.592 -61.472 (delta_t = 178.120 [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 -61.472 sec. to 24.536 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13379 ( -0.142316 0.147481 )
Norm@50keV : 2.17658E-03 ( -0.000211719 0.00020866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.41 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 57 degrees of freedom
# Null hypothesis probability = 2.900369e-01
Photon flux (15-150 keV) in 86.01 sec: 0.348256 ( -0.0249733 0.024982 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7455e-06 ( -1.49577e-07 1.52317e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -61.472 sec. to 24.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82476 ( -0.683533 0.237682 )
Epeak [keV] : 21.8612 ( )
Norm@50keV : 3.35008E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.58 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 56 degrees of freedom
# Null hypothesis probability = 2.832806e-01
Photon flux (15-150 keV) in 86.01 sec: 0.343266 ( -0.026566 0.026525 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67366e-06 ( -1.93522e-07 1.98743e-07 ) ergs/cm2
Band function
Time interval is from -61.472 sec. to 24.536 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.88047 ( -6.19091 -4.88047 )
beta : -2.29896 ( -0.198249 0.179578 )
Epeak [keV] : 21.7854 ( -2.94673 2.70621 )
Norm@50keV : 804.954 ( -57.0637 2597.62 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.29 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 55 degrees of freedom
# Null hypothesis probability = 4.263670e-01
Photon flux (15-150 keV) in 86.01 sec: 0.494833 ( 6.50517 -0.036583 ) 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] : 8.38739 (-0.704319 0.782765)
R^2/D10^2 : 0.308409 (-0.0930989 0.131858)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.61 using 59 PHA bins.
# Reduced chi-squared = 1.677 for 57 degrees of freedom
# Null hypothesis probability = 1.032873e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.487e-07 4.167e-08
25- 50 6.615e-07 6.163e-08
50-150 2.024e-07 4.632e-08
15-150 1.213e-06 1.114e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 50.5436 (-9.84331 14.0983)
Norm : 1.94315 (-0.24862 0.308701)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.00 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.724667e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.097e-07 4.021e-08
25- 50 5.906e-07 4.567e-08
50-150 5.793e-07 1.206e-07
15-150 1.580e-06 1.492e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.18197 (-0.925833 0.940371)
R1^2/D10^2 : 0.868668 (-0.351606 0.704412)
kT2 [keV] : 25.1777 (-7.80107 18.8722)
R2^2/D10^2 : 2.76797E-03 (-0.00226819 0.0084462)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.09 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 55 degrees of freedom
# Null hypothesis probability = 4.336684e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.217e-07 7.595e-08
25- 50 5.694e-07 1.116e-07
50-150 7.418e-07 3.836e-07
15-150 1.733e-06 4.860e-07
Peak spectrum fit
Power-law model
Time interval is from 4.304 sec. to 5.304 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67288 ( -0.307185 0.312217 )
Norm@50keV : 8.85092E-03 ( -0.00176252 0.00172763 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.69 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.783018e-01
Photon flux (15-150 keV) in 1 sec: 1.16461 ( -0.212516 0.212658 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.21375e-08 ( -1.69474e-08 1.7364e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.304 sec. to 5.304 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.881388 ( -3.1627 1.0631 )
Epeak [keV] : 57.0787 ( )
Norm@50keV : 2.62835E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.20 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 56 degrees of freedom
# Null hypothesis probability = 3.596676e-01
Photon flux (15-150 keV) in 1 sec: 1.13731 ( -0.228645 0.22312 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.43099e-08 ( -2.27997e-08 2.34374e-08 ) ergs/cm2
Band function
Time interval is from 4.304 sec. to 5.304 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.55692 ( -5.55546 -4.55692 )
beta : -2.20840 ( -0.720906 0.508644 )
Epeak [keV] : 30.8574 ( -6.0096 6.15572 )
Norm@50keV : 172.537 ( -30.4231 2995.12 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.45 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.576501e-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] : 10.5218 (-1.79912 2.35348)
R^2/D10^2 : 0.479850 (-0.258794 0.495865)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.27 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 57 degrees of freedom
# Null hypothesis probability = 3.254553e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.099e-08 3.598e-09
25- 50 2.930e-08 8.675e-09
50-150 1.769e-08 7.653e-09
15-150 5.797e-08 1.557e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 124.685 (-62.8466 -122.774)
Norm : 4.93801 (-1.03407 1.53591)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.23 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 57 degrees of freedom
# Null hypothesis probability = 3.940154e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.284e-08 7.410e-09
25- 50 2.312e-08 1.285e-08
50-150 4.204e-08 2.765e-08
15-150 7.800e-08 4.754e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.93957 (-1.55464 1.6227)
R1^2/D10^2 : 0.795220 (-0.391164 0.307671)
kT2 [keV] : 197.780 (-198.068 -198.068)
R2^2/D10^2 : 1.40068E-04 (-7.04174e-05 0.00379445)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.20 using 59 PHA bins.
# Reduced chi-squared = 0.9492 for 55 degrees of freedom
# Null hypothesis probability = 5.821031e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.251e-08 5.798e-09
25- 50 2.744e-08 1.202e-08
50-150 4.639e-08 1.399e-08
15-150 8.634e-08 2.432e-08
Plot creation:
Sun Sep 20 14:14:44 EDT 2020