batgrbproduct analysis for trigger=1131397
batgrbproduct Analysis for Trigger=1131397
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): Fri Oct 28 19:02:38 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1131397/GCN5_download_cron
======================================================================
Trigger: 01131397 Segment: 000
BAT Trigger Time: 688590848.896 [s; MET]
Trigger Stop: 688590849.92 [s; MET]
UTC: 2022-10-27T19:13:38.784380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 225.602970286955 Dec: 47.4481624691975 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.69
Image Trigger?: NO
Rate S/N Ratio: 22.2710574513201 [ if not an image trigger ]
Image S/N Ratio: 14.69
Flight Position: [ source = BAT ]
RA: 225.602970286955 Dec: 47.4481624691975 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 225.600748461142 Dec: 47.45121452402 [deg; J2000]
{ 15h 02m 24.2s , +47d 27' 04.4" }
+/- 1.59190249725684 [arcmin] (estimated 90% radius based on SNR)
+/- 0.621650791128187 [arcmin] (formal 1-sigma fit error)
SNR: 15.6554764242828
Angular difference between Flight and Ground position is 0.204110 arcmin
Partial Coding Fraction: 0.4570312 [ including projection effects ]
Duration
T90: 8.65600001811981 +/- 1.09795440933549
Measured from: -5.23999989032745
to: 3.41600012779236 [s; relative to TRIGTIME]
T50: 1.67999994754791 +/- 2.38163649286689
Measured from: -0.519999861717224
to: 1.16000008583069 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0839999914169312
to: 0.916000008583069 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.9760000705719
to: 4.19999992847443 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.428948 0.483068 0.138946 0.021131
0.036476 0.036746 0.030568 0.026168 [error]
Peak 0.131883 0.168526 0.057459 0.012403
0.013457 0.014291 0.011422 0.008191 [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 1.75e-07 1.88e-07 1.44e-07 1.80e-07 5.75e-07 6.87e-07 erg/cm2
Error 2.20e-08 1.90e-08 2.74e-08 6.48e-08 6.45e-08 1.02e-07 erg/cm2
Peak flux Power-law 1.66e+00 1.12e+00 4.96e-01 3.02e-01 3.43e+00 3.59e+00 ph/cm2/s
Error 2.33e-01 1.22e-01 8.68e-02 9.52e-02 3.70e-01 3.85e-01 ph/cm2/s
Fluence Cutoff-PL 1.63e-07 2.16e-07 1.11e-07 1.75e-08 5.06e-07 5.08e-07 erg/cm2
Error 2.45e-08 2.88e-08 4.48e-08 4.99e-08 7.55e-08 9.24e-08 erg/cm2
Peak flux Cutoff-PL 1.46e+00 1.44e+00 4.07e-01 2.13e-02 3.33e+00 3.33e+00 ph/cm2/s
Error 2.62e-01 1.92e-01 1.35e-01 3.91e-02 3.69e-01 3.70e-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 2.387 0.193 - - 5.81e-03 8.10e-04 61.080 57
CPL 0.941 1.364 26.2 0.0 4.72e-02 0.00e+00 56.070 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.180 0.181 - - 2.09e-02 2.87e-03 72.090 57
CPL -0.112 1.314 34.5 5.0 5.44e-01 2.49e+00 57.200 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 10.176 -5.976 4.200
T90 8.656 -5.240 3.416
T50 1.680 -0.520 1.160
Peak 1.000 -0.084 0.916
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
225.6007 +47.4512 0.0123 42.7 177.4 1.0794 15.7 TRIG_01131397
------------------------------------------
Foreground time interval of the image:
-5.976 4.200 (delta_t = 10.176 [sec])
Background time interval of the image:
-239.896 -5.976 (delta_t = 233.920 [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 -5.976 sec. to 4.200 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.38716 ( -0.186338 0.19958 )
Norm@50keV : 5.80915E-03 ( -0.000816693 0.000803292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.08 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 57 degrees of freedom
# Null hypothesis probability = 3.316443e-01
Photon flux (15-150 keV) in 10.18 sec: 1.06682 ( -0.102216 0.102256 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.75208e-07 ( -6.39358e-08 6.51592e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.976 sec. to 4.200 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.940974 ( -1.65822 1.06983 )
Epeak [keV] : 26.2184 ( )
Norm@50keV : 4.72025E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.07 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 56 degrees of freedom
# Null hypothesis probability = 4.722242e-01
Photon flux (15-150 keV) in 10.18 sec: 1.02051 ( -0.107324 0.10812 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.05933e-07 ( -7.02563e-08 8.07457e-08 ) ergs/cm2
Band function
Time interval is from -5.976 sec. to 4.200 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.40013 ( -1.68303 -0.43956 )
beta : -3.00851 ( -1.02816 0.463832 )
Epeak [keV] : 26.9844 ( -4.35965 4.24173 )
Norm@50keV : 2.21858 ( -2.14827 426.242 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.10 using 59 PHA bins.
# Reduced chi-squared = 0.9473 for 55 degrees of freedom
# Null hypothesis probability = 5.860294e-01
Photon flux (15-150 keV) in 10.18 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] : 7.65995 (-0.730631 0.810864)
R^2/D10^2 : 1.39861 (-0.477815 0.726066)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.87 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.063717e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.460e-07 2.397e-08
25- 50 2.366e-07 3.120e-08
50-150 5.374e-08 1.763e-08
15-150 4.363e-07 5.640e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.1708 (-7.43898 10.1646)
Norm : 7.40914 (-1.34101 1.69642)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.670e-07 2.112e-08
25- 50 2.099e-07 2.341e-08
50-150 1.449e-07 4.657e-08
15-150 5.218e-07 6.301e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.79186 (-1.11786 0.956307)
R1^2/D10^2 : 2.10758 (-0.840963 1.21207)
kT2 [keV] : 31.8117 (-17.2715 -31.8256)
R2^2/D10^2 : 2.17614E-03 (-0.00214128 0.0185997)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.573e-07 3.385e-08
25- 50 2.200e-07 4.968e-08
50-150 1.783e-07 9.358e-08
15-150 5.556e-07 1.461e-07
Peak spectrum fit
Power-law model
Time interval is from -0.084 sec. to 0.916 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.18027 ( -0.175668 0.186427 )
Norm@50keV : 2.09444E-02 ( -0.00288923 0.00284348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.09 using 59 PHA bins.
# Reduced chi-squared = 1.265 for 57 degrees of freedom
# Null hypothesis probability = 8.599500e-02
Photon flux (15-150 keV) in 1 sec: 3.43187 ( -0.369464 0.369538 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96384e-07 ( -2.40699e-08 2.44053e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.084 sec. to 0.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.111792 ( -1.48938 1.13947 )
Epeak [keV] : 34.4908 ( -4.99812 5.03409 )
Norm@50keV : 0.544481 ( -0.545004 4.4262 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.20 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 56 degrees of freedom
# Null hypothesis probability = 4.302844e-01
Photon flux (15-150 keV) in 1 sec: 3.33172 ( -0.36838 0.36965 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71283e-07 ( -2.2717e-08 2.4616e-08 ) ergs/cm2
Band function
Time interval is from -0.084 sec. to 0.916 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.14691 -5 )
beta : -2.87209 ( -0.54399 0.351618 )
Epeak [keV] : 27.7003 ( -3.08372 2.59307 )
Norm@50keV : 2295.57 ( -236.336 2645.18 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.17 using 59 PHA bins.
# Reduced chi-squared = 0.9485 for 55 degrees of freedom
# Null hypothesis probability = 5.835354e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83961e-07 ( -1.83954e-07 -2.4305e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.77708 (-0.896907 0.988343)
R^2/D10^2 : 2.83671 (-0.985581 1.51346)
(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 4.197e-08 6.920e-09
25- 50 8.575e-08 1.167e-08
50-150 3.028e-08 9.240e-09
15-150 1.580e-07 2.165e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.9409 (-10.2143 14.6073)
Norm : 20.8229 (-3.37179 4.21917)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.014e-08 6.675e-09
25- 50 7.036e-08 8.710e-09
50-150 6.428e-08 1.920e-08
15-150 1.848e-07 2.610e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 19.0705 (-14.6729 -19.6913)
R1^2/D10^2 : 4.80156E-02 (-0.0388338 1.01862)
kT2 [keV] : 7.20138 (-2.27522 1.68034)
R2^2/D10^2 : 5.03644 (-1.93721 7.28656)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.624e-08 2.815e-08
25- 50 7.624e-08 4.345e-08
50-150 4.542e-08 2.798e-08
15-150 1.679e-07 9.210e-08
Plot creation:
Fri Oct 28 19:05:51 EDT 2022