batgrbproduct analysis for trigger=1159437
batgrbproduct Analysis for Trigger=1159437
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 Mar 12 20:53:25 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1159437/GCN5_download_cron
======================================================================
Trigger: 01159437 Segment: 000
BAT Trigger Time: 700256344 [s; MET]
Trigger Stop: 700256712 [s; MET]
UTC: 2023-03-11T19:38:33.094200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.421711695159 Dec: -47.6423523657583 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.44
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.44
Flight Position: [ source = BAT ]
RA: 248.421711695159 Dec: -47.6423523657583 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 248.377911392117 Dec: -47.653695733716 [deg; J2000]
{ 16h 33m 30.7s , -47d 39' 13.3" }
+/- 2.15001845359274 [arcmin] (estimated 90% radius based on SNR)
+/- 0.987972775336701 [arcmin] (formal 1-sigma fit error)
SNR: 10.1906284919772
Angular difference between Flight and Ground position is 1.896765 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 368 +/- 1
Measured from: 0
to: 368 [s; relative to TRIGTIME]
T50: 368 +/- 1
Measured from: 0
to: 368 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 368 second)
Measured from: 0
to: 368 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 368 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.646138 2.073471 0.610634 0.206517
0.199503 0.165451 0.135276 0.114461 [error]
Peak 3.646138 2.073471 0.610634 0.206517
0.199503 0.165451 0.135276 0.114461 [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 1.26e-06 8.86e-07 4.11e-07 2.66e-07 2.68e-06 2.82e-06 erg/cm2
Error 1.41e-07 9.64e-08 1.03e-07 1.24e-07 2.54e-07 3.03e-07 erg/cm2
Peak flux Power-law 1.15e-01 4.54e-02 1.05e-02 2.95e-03 1.72e-01 1.74e-01 ph/cm2/s
Error 1.33e-02 4.70e-03 2.55e-03 1.29e-03 1.50e-02 1.50e-02 ph/cm2/s
Fluence Cutoff-PL 1.26e-06 8.84e-07 4.07e-07 2.60e-07 2.68e-06 2.81e-06 erg/cm2
Error 1.41e-07 9.74e-08 1.24e-07 2.04e-07 2.76e-07 3.64e-07 erg/cm2
Peak flux Cutoff-PL 1.15e-01 4.52e-02 1.04e-02 2.83e-03 1.72e-01 1.74e-01 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- 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 3.109 0.244 - - 5.78e-04 1.06e-04 66.720 57
CPL 1.000 0.000 50.0 0.0 2.63e-03 0.00e+00 163.160 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.109 0.244 - - 5.78e-04 1.06e-04 66.720 57
CPL 1.000 0.000 50.0 0.0 2.63e-03 0.00e+00 163.160 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 368.000 0.000 368.000
T90 368.000 0.000 368.000
T50 368.000 0.000 368.000
Peak 368.000 0.000 368.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
248.3779 -47.6537 0.0189 31.9 -12.3 6.9590 10.2 TRIG_01159437
------------------------------------------
Foreground time interval of the image:
0.000 178.510 (delta_t = 178.510 [sec])
180.000 368.000 (delta_t = 188.000 [sec])
Background time interval of the image:
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
0.000000 178.510000
180.000000 368.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.10914 ( -0.235022 0.252194 )
Norm@50keV : 5.78420E-04 ( -0.000104359 0.000107382 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.72 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.775300e-01
Photon flux (15-150 keV) in 366.5 sec: 0.172401 ( -0.0149833 0.0150312 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68358e-06 ( -2.51905e-07 2.57043e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 178.510000
180.000000 368.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.62660E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 163.16 using 59 PHA bins.
# Reduced chi-squared = 2.9135 for 56 degrees of freedom
# Null hypothesis probability = 2.075627e-12
Photon flux (15-150 keV) in 366.5 sec: 0.172409 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67942e-06 ( -2.90711e-07 2.60886e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 178.510000
180.000000 368.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46415 ( )
beta : -8.23982 ( )
Epeak [keV] : 29.1037 ( )
Norm@50keV : 2.19364E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 120.27 using 59 PHA bins.
# Reduced chi-squared = 2.1867 for 55 degrees of freedom
# Null hypothesis probability = 9.013907e-07
Photon flux (15-150 keV) in 366.5 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] : 5.22162 (-0.491768 0.55203)
R^2/D10^2 : 1.10246 (-0.428305 0.71174)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.93 using 59 PHA bins.
# Reduced chi-squared = 1.525 for 57 degrees of freedom
# Null hypothesis probability = 6.502055e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.165e-06 1.752e-07
25- 50 8.456e-07 1.307e-07
50-150 4.223e-08 1.783e-08
15-150 2.053e-06 2.653e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.9843 (-3.05125 4.00529)
Norm : 2.46858 (-0.642091 0.920185)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.205e-06 1.565e-07
25- 50 9.217e-07 1.261e-07
50-150 2.067e-07 7.786e-08
15-150 2.333e-06 2.379e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.40612 (-0.605079 0.600875)
R1^2/D10^2 : 2.31832 (-1.06923 2.43058)
kT2 [keV] : 20.0727 (-7.35921 15.6856)
R2^2/D10^2 : 1.64794E-03 (-0.001417 0.00879888)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.258e-06 2.505e-07
25- 50 8.053e-07 1.961e-07
50-150 7.111e-07 4.428e-07
15-150 2.774e-06 7.387e-07
Peak spectrum fit
Power-law model
Time interval is from 180.000 sec. to 368.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.10914 ( -0.235022 0.252194 )
Norm@50keV : 5.78420E-04 ( -0.000104359 0.000107382 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.72 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.775300e-01
Photon flux (15-150 keV) in 366.5 sec: 0.172401 ( -0.0149833 0.0150312 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68358e-06 ( -2.51905e-07 2.57043e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 180.000 sec. to 368.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.62660E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 163.16 using 59 PHA bins.
# Reduced chi-squared = 2.9135 for 56 degrees of freedom
# Null hypothesis probability = 2.075627e-12
Photon flux (15-150 keV) in 366.5 sec: 0.172409 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67942e-06 ( -2.90711e-07 2.60886e-07 ) ergs/cm2
Band function
Time interval is from 180.000 sec. to 368.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46415 ( )
beta : -8.23982 ( )
Epeak [keV] : 29.1037 ( )
Norm@50keV : 2.19364E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 120.27 using 59 PHA bins.
# Reduced chi-squared = 2.1867 for 55 degrees of freedom
# Null hypothesis probability = 9.013907e-07
Photon flux (15-150 keV) in 366.5 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] : 5.22162 (-0.491768 0.55203)
R^2/D10^2 : 1.10246 (-0.428305 0.71174)
(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 1.165e-06 1.653e-07
25- 50 8.456e-07 1.407e-07
50-150 4.223e-08 1.810e-08
15-150 2.053e-06 2.320e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.9843 (-3.05125 4.00529)
Norm : 2.46858 (-0.642091 0.920185)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.205e-06 1.360e-07
25- 50 9.217e-07 1.220e-07
50-150 2.067e-07 7.926e-08
15-150 2.333e-06 2.417e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.40612 (-0.605079 0.600875)
R1^2/D10^2 : 2.31832 (-1.06923 2.43058)
kT2 [keV] : 20.0727 (-7.35921 15.6856)
R2^2/D10^2 : 1.64794E-03 (-0.001417 0.00879888)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.258e-06 2.505e-07
25- 50 8.053e-07 1.730e-07
50-150 7.111e-07 4.119e-07
15-150 2.774e-06 7.632e-07
Plot creation:
Sun Mar 12 20:56:33 EDT 2023