batgrbproduct analysis for trigger=1108515
batgrbproduct Analysis for Trigger=1108515
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): Tue May 31 20:18:51 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1108515/GCN5_download_cron
======================================================================
Trigger: 01108515 Segment: 000
BAT Trigger Time: 675617392 [s; MET]
Trigger Stop: 675617456 [s; MET]
UTC: 2022-05-30T15:29:22.769060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.3527175481 Dec: 35.1396986872402 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.04
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.04
Flight Position: [ source = BAT ]
RA: 299.3527175481 Dec: 35.1396986872402 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.408347511064 Dec: 35.1916931626533 [deg; J2000]
{ 19h 57m 38.0s , +35d 11' 30.1" }
+/- 4.93523142381635 [arcmin] (estimated 90% radius based on SNR)
+/- 3.57930840974369 [arcmin] (formal 1-sigma fit error)
SNR: 3.10941766935872
Angular difference between Flight and Ground position is 4.144596 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 293.451999902725 +/- 77.835508052081
Measured from: -151.415999889374
to: 142.036000013351 [s; relative to TRIGTIME]
T50: 53.2039999961853 +/- 80.9831096083977
Measured from: -20.1159999370575
to: 33.0880000591278 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 16.1640000343323
to: 17.1640000343323 [s; relative to TRIGTIME]
Total Fluence
Measured from: -220.335999965668
to: 160.075999975204 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.070721 5.029326 3.285806 0.679862
0.180730 0.183754 0.158404 0.137726 [error]
Peak 0.032218 0.044450 0.021234 0.003174
0.009899 0.010062 0.008631 0.007767 [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 1.42e-06 2.19e-06 2.54e-06 5.67e-06 7.83e-06 1.18e-05 erg/cm2
Error 1.07e-07 9.95e-08 1.62e-07 7.70e-07 3.78e-07 8.98e-07 erg/cm2
Peak flux Power-law 3.97e-01 2.88e-01 1.39e-01 9.44e-02 8.69e-01 9.18e-01 ph/cm2/s
Error 1.49e-01 8.30e-02 6.76e-02 8.70e-02 2.46e-01 2.65e-01 ph/cm2/s
Fluence Cutoff-PL 1.31e-06 2.29e-06 2.58e-06 2.84e-06 7.51e-06 9.02e-06 erg/cm2
Error 1.31e-07 1.22e-07 1.74e-07 1.40e-06 4.41e-07 1.47e-06 erg/cm2
Peak flux Cutoff-PL 3.71e-01 3.18e-01 1.40e-01 3.80e-02 8.57e-01 8.67e-01 ph/cm2/s
Error 1.65e-01 1.09e-01 1.09e-01 7.11e-02 2.47e-01 2.71e-01 ph/cm2/s
Fluence Band 1.29e-06 2.29e-06 2.55e-06 3.78e-06 7.51e-06 9.92e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.87e-01 3.00e-01 1.42e-01 6.84e-02 8.67e-01 8.97e-01 ph/cm2/s
Error -------- -------- -------- -------- -------- 2.65e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.787 0.083 - - 2.30e-03 1.08e-04 66.210 57
CPL 1.311 0.359 69.6 34.0 4.04e-03 1.76e-03 60.510 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.055 0.540 - - 5.64e-03 2.13e-03 56.150 57
CPL 1.301 1.808 39.4 0.0 1.54e-02 0.00e+00 55.640 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 380.412 -220.336 160.076
T90 293.452 -151.416 142.036
T50 53.204 -20.116 33.088
Peak 1.000 16.164 17.164
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.4083 +35.1917 0.0617 31.7 -126.8 3.6646 3.1 TRIG_01108515
------------------------------------------
Foreground time interval of the image:
-220.336 -56.917 (delta_t = 163.419 [sec])
-49.000 27.010 (delta_t = 76.010 [sec])
28.000 36.840 (delta_t = 8.840 [sec])
39.000 70.601 (delta_t = 31.601 [sec])
Background time interval of the image:
-239.000 -220.336 (delta_t = 18.664 [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
Multiple GTIs in the spectrum
tstart tstop
-220.336000 -56.917000
-49.000000 27.010000
28.000000 36.840000
39.000000 160.076000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78677 ( -0.082472 0.0833989 )
Norm@50keV : 2.30123E-03 ( -0.000108513 0.000107985 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.21 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 57 degrees of freedom
# Null hypothesis probability = 1.889213e-01
Photon flux (15-150 keV) in 369.3 sec: 0.315493 ( -0.0146341 0.0146692 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.82768e-06 ( -3.77583e-07 3.7929e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-220.336000 -56.917000
-49.000000 27.010000
28.000000 36.840000
39.000000 160.076000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31137 ( -0.373467 0.344316 )
Epeak [keV] : 69.6318 ( -12.8078 55.1592 )
Norm@50keV : 4.04063E-03 ( -0.00132661 0.00220176 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.51 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 56 degrees of freedom
# Null hypothesis probability = 3.162424e-01
Photon flux (15-150 keV) in 369.3 sec: 0.306147 ( -0.015975 0.016029 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.51053e-06 ( -4.3991e-07 4.41277e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-220.336000 -56.917000
-49.000000 27.010000
28.000000 36.840000
39.000000 160.076000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26473 ( -0.372214 1.74566 )
beta : -2.24929 ( 2.26023 0.43125 )
Epeak [keV] : 66.4573 ( -35.5558 43.2407 )
Norm@50keV : 4.29546E-03 ( -0.00138346 0.0696698 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.14 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Null hypothesis probability = 2.949178e-01
Photon flux (15-150 keV) in 369.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.50997e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.8203 ( )
R^2/D10^2 : 5.76035E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 153.53 using 59 PHA bins.
# Reduced chi-squared = 2.6935 for 57 degrees of freedom
# Null hypothesis probability = 8.564961e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.416e-07 6.518e-08
25- 50 2.516e-06 1.370e-07
50-150 2.593e-06 2.565e-07
15-150 5.850e-06 3.342e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9812 (-13.7711 32.4913)
Norm : 1.38616 (-0.110184 0.0811374)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.338e-06 1.200e-07
25- 50 2.313e-06 1.379e-07
50-150 3.749e-06 1.024e-06
15-150 7.400e-06 1.067e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.26447 (-1.03804 1.17692)
R1^2/D10^2 : 0.504605 (-0.219965 0.475669)
kT2 [keV] : 20.6145 (-2.72529 4.20335)
R2^2/D10^2 : 7.61218E-03 (-0.00398425 0.00600531)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.259e-06 2.513e-07
25- 50 2.284e-06 3.700e-07
50-150 3.777e-06 6.782e-07
15-150 7.319e-06 1.065e-06
Peak spectrum fit
Power-law model
Time interval is from 16.164 sec. to 17.164 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05476 ( -0.486754 0.592945 )
Norm@50keV : 5.64363E-03 ( -0.00219862 0.00207095 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.15 using 59 PHA bins.
# Reduced chi-squared = 0.9851 for 57 degrees of freedom
# Null hypothesis probability = 5.070142e-01
Photon flux (15-150 keV) in 1 sec: 0.868575 ( -0.246016 0.246018 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.22296e-08 ( -1.78129e-08 1.87807e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 16.164 sec. to 17.164 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30058 ( -2.78029 0.835622 )
Epeak [keV] : 39.3722 ( )
Norm@50keV : 1.54088E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.64 using 59 PHA bins.
# Reduced chi-squared = 0.9936 for 56 degrees of freedom
# Null hypothesis probability = 4.883638e-01
Photon flux (15-150 keV) in 1 sec: 0.856922 ( -0.246227 0.246948 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.97398e-08 ( -1.76782e-08 1.96113e-08 ) ergs/cm2
Band function
Time interval is from 16.164 sec. to 17.164 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28402 ( -6.01084 6.51847 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 39.4762 ( -30.7088 -39.4762 )
Norm@50keV : 1.57316E-02 ( -0.0157316 0.8181 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.64 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 55 degrees of freedom
# Null hypothesis probability = 4.504421e-01
Photon flux (15-150 keV) in 1 sec: 0.867371 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.99222e-08 ( -4.99152e-08 -1.79563e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.48404 (-3.0406 4.66929)
R^2/D10^2 : 0.501967 (-0.499993 1.70645)
(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 9.011e-09 5.560e-09
25- 50 2.075e-08 1.247e-08
50-150 9.269e-09 6.740e-09
15-150 3.903e-08 2.382e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 61.7708 (-33.4413 123.634)
Norm : 4.55794 (-1.66479 2.89657)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.151e-08 4.904e-09
25- 50 1.767e-08 1.051e-08
50-150 2.059e-08 1.629e-08
15-150 4.977e-08 2.770e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.33345 (-5.04921 4.86192)
R1^2/D10^2 : 3.07371 (-2.75472 -3.06981)
kT2 [keV] : 17.7554 (-17.7127 139.556)
R2^2/D10^2 : 3.21470E-02 (-0.0326105 0.478056)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.165e-08 7.210e-09
25- 50 1.667e-08 8.440e-09
50-150 2.167e-08 1.386e-08
15-150 4.999e-08 2.764e-08
Plot creation:
Tue May 31 20:21:57 EDT 2022