batgrbproduct analysis for trigger=1115156
batgrbproduct Analysis for Trigger=1115156
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 Jul 9 10:27:23 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1115156/GCN5_download_cron
======================================================================
Trigger: 01115156 Segment: 000
BAT Trigger Time: 678947999.296 [s; MET]
Trigger Stop: 678948001.344 [s; MET]
UTC: 2022-07-08T04:39:29.839400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 103.118496522178 Dec: 72.1912587827694 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.34
Image Trigger?: NO
Rate S/N Ratio: 11.5325625946708 [ if not an image trigger ]
Image S/N Ratio: 7.34
Flight Position: [ source = BAT ]
RA: 103.118496522178 Dec: 72.1912587827694 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 103.038116936775 Dec: 72.1992798303365 [deg; J2000]
{ 06h 52m 09.1s , +72d 11' 57.4" }
+/- 2.16716712718376 [arcmin] (estimated 90% radius based on SNR)
+/- 0.960591699649949 [arcmin] (formal 1-sigma fit error)
SNR: 10.0756271481209
Angular difference between Flight and Ground position is 1.551222 arcmin
Partial Coding Fraction: 0.7578125 [ including projection effects ]
Duration
T90: 4.39599990844727 +/- 1.02331610138661
Measured from: -1.21599984169006
to: 3.1800000667572 [s; relative to TRIGTIME]
T50: 2.07999992370605 +/- 0.885584615967143
Measured from: 0.128000140190125
to: 2.20800006389618 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.5440000295639
to: 2.5440000295639 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.54799997806549
to: 3.44400000572205 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.105839 0.122876 0.027632 -0.003491
0.014931 0.015117 0.012790 0.011013 [error]
Peak 0.033498 0.040870 0.012778 0.000627
0.006780 0.007200 0.006053 0.005121 [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 3.80e-08 4.29e-08 3.47e-08 4.67e-08 1.33e-07 1.62e-07 erg/cm2
Error 7.39e-09 7.35e-09 1.14e-08 2.91e-08 2.65e-08 4.46e-08 erg/cm2
Peak flux Power-law 3.64e-01 2.78e-01 1.42e-01 1.05e-01 8.33e-01 8.89e-01 ph/cm2/s
Error 1.05e-01 5.77e-02 5.16e-02 7.31e-02 1.71e-01 1.88e-01 ph/cm2/s
Fluence Cutoff-PL 3.50e-08 5.10e-08 2.74e-08 3.99e-09 1.17e-07 1.17e-07 erg/cm2
Error 8.62e-09 1.13e-08 1.45e-08 2.63e-08 2.63e-08 3.25e-08 erg/cm2
Peak flux Cutoff-PL 3.69e-01 2.78e-01 1.39e-01 9.94e-02 8.33e-01 8.89e-01 ph/cm2/s
Error 1.05e-01 5.39e-02 4.82e-02 9.61e-02 1.71e-01 1.46e-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 2.307 0.324 - - 2.78e-03 6.72e-04 62.400 57
CPL 0.644 1.967 30.1 0.0 2.99e-02 0.00e+00 59.800 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.967 0.408 - - 5.64e-03 1.55e-03 48.910 57
CPL 2.380 1.093 140.2 0.0 3.36e-03 0.00e+00 48.230 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 4.992 -1.548 3.444
T90 4.396 -1.216 3.180
T50 2.080 0.128 2.208
Peak 1.000 1.544 2.544
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
103.0381 +72.1993 0.0191 25.4 -136.3 0.2681 10.1 TRIG_01115156
------------------------------------------
Foreground time interval of the image:
-1.548 3.444 (delta_t = 4.992 [sec])
Background time interval of the image:
-239.296 -108.326 (delta_t = 130.970 [sec])
-107.296 -29.346 (delta_t = 77.950 [sec])
-28.295 -1.548 (delta_t = 26.748 [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 -1.548 sec. to 3.444 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.30727 ( -0.302392 0.345072 )
Norm@50keV : 2.77918E-03 ( -0.000680589 0.000663971 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.40 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 57 degrees of freedom
# Null hypothesis probability = 2.904005e-01
Photon flux (15-150 keV) in 4.992 sec: 0.487657 ( -0.0755937 0.0756099 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32755e-07 ( -2.58766e-08 2.71246e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.548 sec. to 3.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.643702 ( -2.43786 1.49624 )
Epeak [keV] : 30.0720 ( )
Norm@50keV : 2.98791E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.80 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 56 degrees of freedom
# Null hypothesis probability = 3.395235e-01
Photon flux (15-150 keV) in 4.992 sec: 0.467871 ( -0.075432 0.077442 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16838e-07 ( -2.31559e-08 2.94997e-08 ) ergs/cm2
Band function
Time interval is from -1.548 sec. to 3.444 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.816032 ( 0.638997 2.77043 )
beta : -3.91344 ( 4.17688 1.91351 )
Epeak [keV] : 29.2687 ( -6.76575 9.5025 )
Norm@50keV : 2.28678E-02 ( -0.029883 1.65208 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.84 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.045383e-01
Photon flux (15-150 keV) in 4.992 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] : 8.50914 (-1.23952 1.40587)
R^2/D10^2 : 0.433898 (-0.198075 0.37345)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.01 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 57 degrees of freedom
# Null hypothesis probability = 3.021837e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.958e-08 8.337e-09
25- 50 5.746e-08 1.390e-08
50-150 1.841e-08 8.998e-09
15-150 1.054e-07 2.346e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 39.8721 (-12.588 21.7297)
Norm : 3.19257 (-0.794106 1.15188)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.656e-08 7.101e-09
25- 50 4.803e-08 1.226e-08
50-150 3.703e-08 2.072e-08
15-150 1.216e-07 3.013e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.89614 (-1.57114 1.89345)
R1^2/D10^2 : 354.927 (-662.92 -668.256)
kT2 [keV] : 9.54432 (-1.55802 2.07525)
R2^2/D10^2 : 0.252370 (-0.153533 0.201246)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.304e-08 1.345e-08
25- 50 5.358e-08 2.565e-08
50-150 2.430e-08 1.386e-08
15-150 1.109e-07 4.716e-08
Peak spectrum fit
Power-law model
Time interval is from 1.544 sec. to 2.544 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96694 ( -0.383778 0.432627 )
Norm@50keV : 5.63821E-03 ( -0.00158989 0.00150047 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.91 using 59 PHA bins.
# Reduced chi-squared = 0.8580 for 57 degrees of freedom
# Null hypothesis probability = 7.684671e-01
Photon flux (15-150 keV) in 1 sec: 0.833130 ( -0.171234 0.171236 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.19169e-08 ( -1.33359e-08 1.3929e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.544 sec. to 2.544 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.37993 ( -2.02722 0.159026 )
Epeak [keV] : 140.151 ( )
Norm@50keV : 3.36374E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.23 using 59 PHA bins.
# Reduced chi-squared = 0.8612 for 56 degrees of freedom
# Null hypothesis probability = 7.604932e-01
Photon flux (15-150 keV) in 1 sec: 0.832602 ( -0.171223 0.171238 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.20366e-08 ( -1.69278e-08 1.35054e-08 ) ergs/cm2
Band function
Time interval is from 1.544 sec. to 2.544 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.33439 ( -4.33402 -4.33402 )
beta : -2.08441 ( -0.473362 0.446761 )
Epeak [keV] : 21.7571 ( -21.6973 130.195 )
Norm@50keV : 658.471 ( -671.399 337.236 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.60 using 59 PHA bins.
# Reduced chi-squared = 0.8836 for 55 degrees of freedom
# Null hypothesis probability = 7.162181e-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] : 8.48780 (-1.66605 2.07705)
R^2/D10^2 : 0.736444 (-0.423794 0.977425)
(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 9.990e-09 4.528e-09
25- 50 1.933e-08 7.535e-09
50-150 6.143e-09 4.026e-09
15-150 3.546e-08 1.306e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 63.6915 (-31.7062 113.826)
Norm : 4.24590 (-1.29235 2.10072)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.077e-08 3.270e-09
25- 50 1.668e-08 5.361e-09
50-150 1.993e-08 1.340e-08
15-150 4.738e-08 1.492e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 197.250 (-151.822 -197.394)
R1^2/D10^2 : 9.85534E-05 (-5.20548e-05 0.00199764)
kT2 [keV] : 7.53708 (-1.51717 1.56249)
R2^2/D10^2 : 1.08054 (-0.587025 1.54818)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.050e-08 5.765e-09
25- 50 1.847e-08 1.092e-08
50-150 7.789e-09 5.115e-09
15-150 3.676e-08 2.067e-08
Plot creation:
Sat Jul 9 10:34:25 EDT 2022