batgrbproduct analysis for trigger=1110865
batgrbproduct Analysis for Trigger=1110865
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 Jun 19 21:37:32 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1110865/GCN5_download_cron
======================================================================
Trigger: 01110865 Segment: 000
BAT Trigger Time: 677276792 [s; MET]
Trigger Stop: 677276856 [s; MET]
UTC: 2022-06-18T20:26:02.656640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 103.793142902859 Dec: -1.53069798997938 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.53
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.53
Flight Position: [ source = BAT ]
RA: 103.793142902859 Dec: -1.53069798997938 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 103.834860917281 Dec: -1.48976332769513 [deg; J2000]
{ 06h 55m 20.4s , -01d 29' 23.1" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 1.36189554804756 [arcmin] (formal 1-sigma fit error)
SNR: -6.89369672947188
Angular difference between Flight and Ground position is 3.506193 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 318.783999919891 +/- 159.043943599311
Measured from: 197.759999990463
to: 516.543999910355 [s; relative to TRIGTIME]
T50: 182.783999919891 +/- 173.150424022757
Measured from: 266.240000009537
to: 449.023999929428 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 529.771999955177
to: 530.771999955177 [s; relative to TRIGTIME]
Total Fluence
Measured from: 176.192000031471
to: 554.815999984741 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.075853 0.209567 -0.179937 -0.165756
0.161002 0.170758 0.146152 0.142328 [error]
Peak 0.018245 0.038929 0.012097 0.021636
0.010471 0.012286 0.010057 0.011360 [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 5.17e-08 3.77e-08 1.67e-08 1.24e-08 1.15e-07 1.06e-07 erg/cm2
Error 5.91e-08 5.38e-08 5.53e-08 6.58e-07 1.74e-07 6.71e-07 erg/cm2
Peak flux Power-law 2.48e-01 2.04e-01 1.14e-01 9.39e-02 6.07e-01 6.60e-01 ph/cm2/s
Error 1.38e-01 8.90e-02 7.64e-02 1.30e-01 2.64e-01 2.97e-01 ph/cm2/s
Fluence Cutoff-PL 3.66e-08 9.51e-08 2.76e-08 1.82e-10 1.62e-07 1.56e-07 erg/cm2
Error 5.93e-08 1.13e-07 7.11e-08 1.22e-07 1.75e-07 1.75e-07 erg/cm2
Peak flux Cutoff-PL 1.64e-01 2.99e-01 1.17e-01 4.78e-03 5.84e-01 5.86e-01 ph/cm2/s
Error 1.66e-01 1.37e-01 9.07e-02 4.71e-02 2.61e-01 2.62e-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 3.045 0.000 - - 2.46e-05 5.00e-05 46.670 57
CPL -3.319 0.000 35.6 0.0 1.23e-01 0.00e+00 45.950 56
The chi2 of BB fit is 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 1.841 0.777 - - 4.34e-03 2.33e-03 58.020 57
CPL -0.675 1.074 44.8 0.0 1.13e-01 4.71e+03 55.950 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 378.624 176.192 554.816
T90 318.784 197.760 516.544
T50 182.784 266.240 449.024
Peak 1.000 529.772 530.772
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
103.8349 -1.4898 0.0279 20.0 -79.8 -2.5986 -6.9 TRIG_01110865
------------------------------------------
Foreground time interval of the image:
176.192 507.601 (delta_t = 331.409 [sec])
Background time interval of the image:
-240.000 176.192 (delta_t = 416.192 [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
176.192000 538.590000
540.000000 554.816000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.04468 ( -3.04272 -3.04272 )
Norm@50keV : 2.45698E-05 ( -2.46166e-05 7.53709e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.67 using 59 PHA bins.
# Reduced chi-squared = 0.8187 for 57 degrees of freedom
# Null hypothesis probability = 8.339639e-01
Photon flux (15-150 keV) in 377.2 sec: 6.98326E-03 ( -0.00698326 0.0096412 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15481e-07 ( -1.12343e-07 2.36398e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
176.192000 538.590000
540.000000 554.816000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.31855 ( )
Epeak [keV] : 35.5892 ( )
Norm@50keV : 0.122628 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.95 using 59 PHA bins.
# Reduced chi-squared = 0.8205 for 56 degrees of freedom
# Null hypothesis probability = 8.287389e-01
Photon flux (15-150 keV) in 377.2 sec: 8.50532E-03 8.24278E-03 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62364e-07 ( -1.62364e-07 1.8742e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
176.192000 538.590000
540.000000 554.816000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.88044 ( -4.88044 -4.88044 )
beta : -9.37167 ( 9.37167 9.37167 )
Epeak [keV] : 39.1663 ( -39.1663 -39.1663 )
Norm@50keV : 0.593823 ( -0.593823 2.64195e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.96 using 59 PHA bins.
# Reduced chi-squared = 0.8356 for 55 degrees of freedom
# Null hypothesis probability = 8.023285e-01
Photon flux (15-150 keV) in 377.2 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] : 8.41291 (-8.59669 -8.59669)
R^2/D10^2 : 8.88060E-03 (-0.0088597 -0.0088597)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.98 using 59 PHA bins.
# Reduced chi-squared = 0.8067 for 57 degrees of freedom
# Null hypothesis probability = 8.516905e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.439e-08 3.438e-08
25- 50 8.463e-08 8.042e-08
50-150 2.615e-08 2.976e-08
15-150 1.552e-07 1.343e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 22.7551 (-24.5067 -24.5067)
Norm : 8.27620E-02 (-0.0814227 -0.0814227)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.359e-08 4.232e-08
25- 50 5.158e-08 4.985e-08
50-150 1.903e-08 3.876e-08
15-150 1.242e-07 1.165e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.00278 (-1.96347 -1.96347)
R1^2/D10^2 : 2.90297 (-4.01277 -4.01277)
kT2 [keV] : 8.88314 (-8.89055 -8.89055)
R2^2/D10^2 : 6.62690E-03 (-0.00661346 -0.00661346)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.833e-08 3.485e-08
25- 50 7.969e-08 6.395e-08
50-150 2.910e-08 2.654e-08
15-150 1.571e-07 1.135e-07
Peak spectrum fit
Power-law model
Time interval is from 529.772 sec. to 530.772 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84138 ( -0.681879 0.873077 )
Norm@50keV : 4.33613E-03 ( -0.00238789 0.0022728 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.02 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.376371e-01
Photon flux (15-150 keV) in 1 sec: 0.607405 ( -0.263363 0.263873 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.9904e-08 ( -2.03693e-08 2.24551e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 529.772 sec. to 530.772 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.674750 ( 1.55803 3.70643 )
Epeak [keV] : 44.7566 ( -44.808 -44.808 )
Norm@50keV : 0.112841 ( -0.413142 9420.13 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.95 using 59 PHA bins.
# Reduced chi-squared = 0.9991 for 56 degrees of freedom
# Null hypothesis probability = 4.767507e-01
Photon flux (15-150 keV) in 1 sec: 0.583870 ( -0.264197 0.258392 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.52101e-08 ( -1.51616e-08 1.87825e-08 ) ergs/cm2
Band function
Time interval is from 529.772 sec. to 530.772 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.56085 ( -3.61508 -1.61505 )
beta : -9.37167 ( 9.37167 19.3706 )
Epeak [keV] : 44.9823 ( -14.6686 127.203 )
Norm@50keV : 0.356129 ( -0.444311 111.418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.65 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 55 degrees of freedom
# Null hypothesis probability = 4.502772e-01
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] : 11.5567 (-3.51728 4.73782)
R^2/D10^2 : 0.198511 (-0.198444 0.514777)
(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 5.585e-09 3.586e-09
25- 50 1.680e-08 1.071e-08
50-150 1.315e-08 1.000e-08
15-150 3.553e-08 2.259e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 75.9471 (-75.6361 -75.6361)
Norm : 3.00032 (-1.40576 2.42558)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.756e-09 4.906e-09
25- 50 1.261e-08 8.325e-09
50-150 1.717e-08 1.597e-08
15-150 3.753e-08 2.752e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.573316 (-1.23782 14.5242)
R1^2/D10^2 : 4.67227E+09 (-4.93199e+09 -4.93199e+09)
kT2 [keV] : 11.8771 (-3.59673 5.09411)
R2^2/D10^2 : 0.174682 (-0.13197 0.423513)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.887e-09 3.489e-09
25- 50 1.605e-08 1.017e-08
50-150 1.372e-08 1.085e-08
15-150 3.566e-08 2.367e-08
Plot creation:
Sun Jun 19 21:40:53 EDT 2022