batgrbproduct analysis for trigger=1108208
batgrbproduct Analysis for Trigger=1108208
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 May 28 20:54:19 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1108208/GCN5_download_cron
======================================================================
Trigger: 01108208 Segment: 000
BAT Trigger Time: 675383107.136 [s; MET]
Trigger Stop: 675383134.016 [s; MET]
UTC: 2022-05-27T22:24:37.920940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.98319757822 Dec: -15.6563723142672 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 15.15
Image Trigger?: NO
Rate S/N Ratio: 19.4164878389476 [ if not an image trigger ]
Image S/N Ratio: 15.15
Flight Position: [ source = BAT ]
RA: 244.98319757822 Dec: -15.6563723142672 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.945009831801 Dec: -15.6744151775186 [deg; J2000]
{ 16h 19m 46.8s , -15d 40' 27.9" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 0.927397459193914 [arcmin] (formal 1-sigma fit error)
SNR: -12.2417538425004
Angular difference between Flight and Ground position is 2.457455 arcmin
Partial Coding Fraction: 0.734375 [ including projection effects ]
Duration
T90: 719 +/- 490.91445283267
Measured from: -199.135999917984
to: 519.864000082016 [s; relative to TRIGTIME]
T50: 489 +/- 627.912414274475
Measured from: -105.135999917984
to: 383.864000082016 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 16.8639999628067
to: 17.8639999628067 [s; relative to TRIGTIME]
Total Fluence
Measured from: -225.136000037193
to: 651.863999962807 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 61.628348 5.135933 0.285986 0.197520
0.260338 0.218385 0.184204 0.160890 [error]
Peak 0.158575 0.010951 0.005026 0.009661
0.010540 0.007560 0.006360 0.005870 [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 2.12e-05 2.09e-06 8.39e-08 3.49e-09 2.34e-05 2.34e-05 erg/cm2
Error 1.52e-06 1.34e-07 1.57e-08 1.15e-09 1.50e-06 1.50e-06 erg/cm2
Peak flux Power-law 1.57e+00 1.34e-01 4.43e-03 1.51e-04 1.71e+00 1.71e+00 ph/cm2/s
Error 2.44e-01 5.99e-02 5.64e-03 3.38e-04 2.66e-01 2.66e-01 ph/cm2/s
Fluence Cutoff-PL 1.93e-05 1.83e-06 4.35e-09 2.64e-14 2.12e-05 2.12e-05 erg/cm2
Error 1.84e-06 1.54e-07 5.92e-09 7.19e-13 1.84e-06 1.84e-06 erg/cm2
Peak flux Cutoff-PL 1.58e+00 1.32e-01 4.06e-03 1.15e-04 1.71e+00 1.71e+00 ph/cm2/s
Error 3.39e-01 9.16e-02 4.57e-03 0.00e+00 3.15e-01 2.73e-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 6.641 0.193 - - 1.18e-04 1.78e-05 81.040 57
CPL 1.000 0.000 50.0 0.0 1.69e-03 0.00e+00 1161.230 56
The chi2 of BB fit is 57.18 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.919 0.832 - - 4.51e-04 4.08e-04 56.750 57
CPL 1.000 0.000 50.0 0.0 1.45e-02 0.00e+00 137.910 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 877.000 -225.136 651.864
T90 719.000 -199.136 519.864
T50 489.000 -105.136 383.864
Peak 1.000 16.864 17.864
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.9450 -15.6744 0.0157 17.7 101.9 -29.8147 -12.2 TRIG_01108208
------------------------------------------
Foreground time interval of the image:
-225.136 -80.896 (delta_t = 144.240 [sec])
-80.136 -45.556 (delta_t = 34.580 [sec])
-33.136 -13.836 (delta_t = 19.300 [sec])
-10.136 353.865 (delta_t = 364.001 [sec])
Background time interval of the image:
-239.136 -225.136 (delta_t = 14.000 [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
-225.136000 -80.896000
-80.136000 -45.556000
-33.136000 -13.836000
-10.136000 651.864000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.64113 ( -0.194528 0.192043 )
Norm@50keV : 1.17799E-04 ( -1.6702e-05 1.89818e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.04 using 59 PHA bins.
# Reduced chi-squared = 1.422 for 57 degrees of freedom
# Null hypothesis probability = 1.988296e-02
Photon flux (15-150 keV) in 860.1 sec: 0.929844 ( -0.0642494 0.0653081 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33583e-05 ( -1.48719e-06 1.5094e-06 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-225.136000 -80.896000
-80.136000 -45.556000
-33.136000 -13.836000
-10.136000 651.864000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.69232E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1161.23 using 59 PHA bins.
# Reduced chi-squared = 20.7363 for 56 degrees of freedom
# Null hypothesis probability = 2.823155e-206
Photon flux (15-150 keV) in 860.1 sec: 0.832983 ( -0.080346 0.079161 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11533e-05 ( -1.85575e-06 1.82565e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-225.136000 -80.896000
-80.136000 -45.556000
-33.136000 -13.836000
-10.136000 651.864000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.61058 ( )
beta : -8.77649 ( )
Epeak [keV] : 14.1069 ( )
Norm@50keV : 2.38529E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 926.92 using 59 PHA bins.
# Reduced chi-squared = 16.853 for 55 degrees of freedom
# Null hypothesis probability = 1.197649e-158
Photon flux (15-150 keV) in 860.1 sec: 1.36375 ( 5.63625 -0.13657 ) 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] : 2.68191 (-0.0959425 0.103342)
R^2/D10^2 : 231.798 (-66.5379 91.5395)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.18 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 57 degrees of freedom
# Null hypothesis probability = 4.685488e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.795e-05 1.703e-06
25- 50 1.738e-06 1.355e-07
50-150 1.067e-09 3.590e-10
15-150 1.968e-05 1.755e-06
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.43165 (-0.216723 0.239394)
Norm : 307.304 (-74.3531 96.3899)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.947e-05 1.634e-06
25- 50 1.849e-06 1.415e-07
50-150 5.025e-09 1.643e-09
15-150 2.133e-05 1.802e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.97031 (-0.0959345 0.10335)
R1^2/D10^2 : 1369.15 (-66.5443 91.5335)
kT2 [keV] : 3.08594 (-2.32094 45.1688)
R2^2/D10^2 : 52.0213 (-51.8141 171.315)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 16.864 sec. to 17.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.91943 ( -0.789505 0.873729 )
Norm@50keV : 4.50804E-04 ( -0.000275522 0.000539919 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.75 using 59 PHA bins.
# Reduced chi-squared = 0.9956 for 57 degrees of freedom
# Null hypothesis probability = 4.843430e-01
Photon flux (15-150 keV) in 1 sec: 1.71120 ( -0.265754 0.265719 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.16058e-08 ( -8.51765e-09 8.61662e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 16.864 sec. to 17.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.44595E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 137.91 using 59 PHA bins.
# Reduced chi-squared = 2.4626 for 56 degrees of freedom
# Null hypothesis probability = 7.369261e-09
Photon flux (15-150 keV) in 1 sec: 1.70860 1.73815 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03483e-08 ( -7.8066e-09 7.8223e-09 ) ergs/cm2
Band function
Time interval is from 16.864 sec. to 17.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.88454 ( )
beta : -3.63330 ( )
Epeak [keV] : 6.98101 ( )
Norm@50keV : 1.18225E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 117.65 using 59 PHA bins.
# Reduced chi-squared = 2.1391 for 55 degrees of freedom
# Null hypothesis probability = 1.891465e-06
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 2.37135 (-0.307084 0.358462)
R^2/D10^2 : 1285.18 (-1285.17 2608.76)
(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 4.760e-08 2.562e-08
25- 50 2.813e-09 1.653e-09
50-150 5.220e-13 5.835e-13
15-150 5.042e-08 2.707e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.16907 (-0.7904 1.05913)
Norm : 812.417 (-481.552 1308.25)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.669e-08 2.074e-08
25- 50 3.795e-09 2.100e-09
50-150 7.215e-12 8.002e-12
15-150 5.049e-08 2.607e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.30092 (-0.32695 0.360696)
R1^2/D10^2 : 1583.51 (-792.127 3826.02)
kT2 [keV] : 20.2294 (-10.3839 -20.1998)
R2^2/D10^2 : 8.73113E-03 (-0.00876074 0.438697)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.719e-08 2.553e-08
25- 50 5.855e-09 3.467e-09
50-150 1.045e-08 7.920e-09
15-150 6.350e-08 3.202e-08
Plot creation:
Sat May 28 20:57:48 EDT 2022