batgrbproduct analysis for trigger=1145959
batgrbproduct Analysis for Trigger=1145959
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 Dec 27 14:41:11 EST 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1145959/GCN5_download_cron
======================================================================
Trigger: 01145959 Segment: 000
BAT Trigger Time: 693787310.528 [s; MET]
Trigger Stop: 693787311.04 [s; MET]
UTC: 2022-12-26T22:41:20.062780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 22.9171584316979 Dec: -41.5539444002905 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.7
Image Trigger?: NO
Rate S/N Ratio: 17.7763888346312 [ if not an image trigger ]
Image S/N Ratio: 7.7
Flight Position: [ source = BAT ]
RA: 22.9171584316979 Dec: -41.5539444002905 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 22.9027267781027 Dec: -41.5145896239707 [deg; J2000]
{ 01h 31m 36.7s , -41d 30' 52.5" }
+/- 1.23231208504863 [arcmin] (estimated 90% radius based on SNR)
+/- 0.552822067629766 [arcmin] (formal 1-sigma fit error)
SNR: 22.5692625738215
Angular difference between Flight and Ground position is 2.448634 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 3.44000005722046 +/- 0.568169042631367
Measured from: 0.296000123023987
to: 3.73600018024445 [s; relative to TRIGTIME]
T50: 1.48800003528595 +/- 0.200479460617901
Measured from: 0.74400007724762
to: 2.23200011253357 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.236000061035156
to: 1.23600006103516 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.215999960899353
to: 4.27999997138977 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.184916 0.284544 0.272695 0.089395
0.019001 0.021088 0.019557 0.015264 [error]
Peak 0.084866 0.116593 0.108611 0.038032
0.010286 0.011706 0.010870 0.007872 [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 4.90e-08 1.11e-07 1.99e-07 8.46e-07 5.43e-07 1.21e-06 erg/cm2
Error 6.77e-09 9.33e-09 1.80e-08 1.68e-07 4.60e-08 1.80e-07 erg/cm2
Peak flux Power-law 7.08e-01 8.21e-01 6.84e-01 9.61e-01 2.56e+00 3.17e+00 ph/cm2/s
Error 1.26e-01 8.97e-02 8.47e-02 2.47e-01 2.57e-01 3.44e-01 ph/cm2/s
Fluence Cutoff-PL 4.42e-08 1.17e-07 2.09e-07 4.10e-07 5.25e-07 7.80e-07 erg/cm2
Error 8.18e-09 1.12e-08 2.08e-08 3.06e-07 5.05e-08 3.07e-07 erg/cm2
Peak flux Cutoff-PL 6.84e-01 8.36e-01 6.98e-01 7.68e-01 2.54e+00 2.99e+00 ph/cm2/s
Error 1.11e-01 1.04e-01 9.64e-02 3.08e-01 2.63e-01 5.30e-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 1.156 0.127 - - 1.30e-02 9.74e-04 73.470 57
CPL 0.627 0.558 137.7 1106.0 2.34e-02 1.55e-02 70.450 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.262 0.172 - - 2.16e-02 2.18e-03 52.510 57
CPL 1.077 0.538 257.0 0.0 2.67e-02 2.19e-02 52.270 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: 3.520000 sec.
T50 in the 50-300 keV band: 1.600000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 4.064 0.216 4.280
T90 3.440 0.296 3.736
T50 1.488 0.744 2.232
Peak 1.000 0.236 1.236
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
22.9027 -41.5146 0.0085 10.6 -50.7 0.8582 22.6 TRIG_01145959
------------------------------------------
Foreground time interval of the image:
0.216 4.280 (delta_t = 4.064 [sec])
Background time interval of the image:
-162.027 0.216 (delta_t = 162.243 [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 0.216 sec. to 4.280 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15634 ( -0.127974 0.126962 )
Norm@50keV : 1.30085E-02 ( -0.000974198 0.00097415 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.47 using 59 PHA bins.
# Reduced chi-squared = 1.289 for 57 degrees of freedom
# Null hypothesis probability = 6.993868e-02
Photon flux (15-150 keV) in 4.064 sec: 1.51821 ( -0.115497 0.115578 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.43198e-07 ( -4.58854e-08 4.61719e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.216 sec. to 4.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.626554 ( -0.596815 0.519462 )
Epeak [keV] : 137.711 ( -47.1594 2164.93 )
Norm@50keV : 2.34125E-02 ( -0.00998608 0.0209931 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.45 using 59 PHA bins.
# Reduced chi-squared = 1.258 for 56 degrees of freedom
# Null hypothesis probability = 9.263509e-02
Photon flux (15-150 keV) in 4.064 sec: 1.48840 ( -0.11991 0.11943 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.24829e-07 ( -5.0735e-08 5.02432e-08 ) ergs/cm2
Band function
Time interval is from 0.216 sec. to 4.280 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.354011 ( -0.787053 0.351404 )
beta : -1.51281 ( 1.50985 0.363717 )
Epeak [keV] : 98.7185 ( -48.9082 395.012 )
Norm@50keV : 3.34116E-02 ( -0.0193941 186.268 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.66 using 59 PHA bins.
# Reduced chi-squared = 1.267 for 55 degrees of freedom
# Null hypothesis probability = 8.808767e-02
Photon flux (15-150 keV) in 4.064 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] : 18.4102 (-1.71222 1.94697)
R^2/D10^2 : 9.38877E-02 (-0.0264226 0.0356017)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 93.11 using 59 PHA bins.
# Reduced chi-squared = 1.634 for 57 degrees of freedom
# Null hypothesis probability = 1.791231e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.570e-08 3.950e-09
25- 50 1.209e-07 1.282e-08
50-150 2.990e-07 4.279e-08
15-150 4.456e-07 4.241e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-15.8787 -200)
Norm : 6.18415 (-0.474328 0.474328)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.259e-08 5.710e-09
25- 50 1.204e-07 1.896e-08
50-150 2.641e-07 1.084e-07
15-150 4.471e-07 1.232e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.91936 (-4.25065 4.42115)
R1^2/D10^2 : 0.415265 (-0.240254 1.55358)
kT2 [keV] : 34.5851 (-12.3634 -34.959)
R2^2/D10^2 : 9.05413E-03 (-0.00795982 0.014149)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.001e-08 1.520e-08
25- 50 1.238e-07 4.332e-08
50-150 3.648e-07 1.751e-07
15-150 5.286e-07 2.173e-07
Peak spectrum fit
Power-law model
Time interval is from 0.236 sec. to 1.236 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26233 ( -0.171639 0.172179 )
Norm@50keV : 2.15944E-02 ( -0.00218026 0.00217442 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.51 using 59 PHA bins.
# Reduced chi-squared = 0.9212 for 57 degrees of freedom
# Null hypothesis probability = 6.440287e-01
Photon flux (15-150 keV) in 1 sec: 2.55924 ( -0.256719 0.256815 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15421e-07 ( -2.49273e-08 2.51692e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.236 sec. to 1.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07663 ( -0.737102 0.339605 )
Epeak [keV] : 256.981 ( -256.988 -256.988 )
Norm@50keV : 2.67269E-02 ( -0.00967488 0.0341351 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.27 using 59 PHA bins.
# Reduced chi-squared = 0.9335 for 56 degrees of freedom
# Null hypothesis probability = 6.166537e-01
Photon flux (15-150 keV) in 1 sec: 2.54340 ( -0.26303 0.26233 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12803e-07 ( -2.7183e-08 2.6746e-08 ) ergs/cm2
Band function
Time interval is from 0.236 sec. to 1.236 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.52584 ( -4.52584 -4.52584 )
beta : -1.29868 ( -0.190262 0.182721 )
Epeak [keV] : 22.8558 ( -22.8558 7.27971 )
Norm@50keV : 1364.78 ( -135.707 6.88526e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.02 using 59 PHA bins.
# Reduced chi-squared = 0.9458 for 55 degrees of freedom
# Null hypothesis probability = 5.892584e-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] : 16.8802 (-2.09238 2.49434)
R^2/D10^2 : 0.205366 (-0.0755867 0.114108)
(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 1.194e-08 2.340e-09
25- 50 5.253e-08 7.630e-09
50-150 1.066e-07 2.207e-08
15-150 1.711e-07 2.425e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-32.5796 -200)
Norm : 10.4201 (-1.05073 1.05073)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.595e-08 8.140e-09
25- 50 4.991e-08 1.445e-08
50-150 1.095e-07 5.955e-08
15-150 1.853e-07 9.710e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.61436 (-3.23221 5.85551)
R1^2/D10^2 : 1.67530 (-1.27599 15.7445)
kT2 [keV] : 29.6571 (-9.82481 -29.6252)
R2^2/D10^2 : 2.56638E-02 (-0.0254917 0.0510828)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.088e-08 1.106e-08
25- 50 4.793e-08 1.941e-08
50-150 1.410e-07 7.303e-08
15-150 2.098e-07 9.504e-08
Plot creation:
Tue Dec 27 14:46:53 EST 2022