batgrbproduct analysis for trigger=1121751
batgrbproduct Analysis for Trigger=1121751
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 Aug 27 14:25:23 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1121751/GCN5_download_cron
======================================================================
Trigger: 01121751 Segment: 000
BAT Trigger Time: 683207751.488 [s; MET]
Trigger Stop: 683207752 [s; MET]
UTC: 2022-08-26T11:55:21.742040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 206.43146700875 Dec: -44.0445504797927 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.45
Image Trigger?: NO
Rate S/N Ratio: 16.4924225024706 [ if not an image trigger ]
Image S/N Ratio: 7.45
Flight Position: [ source = BAT ]
RA: 206.43146700875 Dec: -44.0445504797927 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 206.421041384807 Dec: -44.0361352154115 [deg; J2000]
{ 13h 45m 41.0s , -44d 02' 10.1" }
+/- 1.0837310082084 [arcmin] (estimated 90% radius based on SNR)
+/- 0.328949665874138 [arcmin] (formal 1-sigma fit error)
SNR: 27.1163058128447
Angular difference between Flight and Ground position is 0.676122 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 11.1399999856949 +/- 1.0195685291616
Measured from: 0.25600004196167
to: 11.3960000276566 [s; relative to TRIGTIME]
T50: 6.31599986553192 +/- 0.472715486748375
Measured from: 1.76800012588501
to: 8.08399999141693 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.57999992370605
to: 7.57999992370605 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.200000047683716
to: 13.0080000162125 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.484018 0.681954 0.528772 0.101463
0.029096 0.031193 0.028697 0.027749 [error]
Peak 0.056385 0.124968 0.113134 0.038584
0.008638 0.009935 0.009276 0.008669 [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 1.46e-07 2.79e-07 4.12e-07 1.30e-06 1.16e-06 2.14e-06 erg/cm2
Error 1.40e-08 1.56e-08 2.86e-08 2.01e-07 6.91e-08 2.21e-07 erg/cm2
Peak flux Power-law 6.35e-01 8.09e-01 7.53e-01 1.23e+00 2.61e+00 3.43e+00 ph/cm2/s
Error 1.08e-01 8.33e-02 7.50e-02 2.64e-01 2.30e-01 3.28e-01 ph/cm2/s
Fluence Cutoff-PL 1.43e-07 2.82e-07 4.15e-07 1.05e-06 1.15e-06 1.90e-06 erg/cm2
Error 1.68e-08 1.81e-08 3.04e-08 3.74e-07 7.81e-08 4.49e-07 erg/cm2
Peak flux Cutoff-PL 6.02e-01 8.25e-01 7.73e-01 9.26e-01 2.59e+00 3.13e+00 ph/cm2/s
Error 1.33e-01 8.98e-02 8.89e-02 3.74e-01 2.39e-01 5.47e-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 1.439 0.097 - - 9.18e-03 4.87e-04 59.910 57
CPL 1.306 0.289 266.5 0.0 1.07e-02 3.89e-03 59.540 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.105 0.153 - - 2.25e-02 1.95e-03 62.360 57
CPL 0.857 0.499 248.7 0.0 2.95e-02 1.97e-02 61.860 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: 10.560000 sec.
T50 in the 50-300 keV band: 6.144000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 13.208 -0.200 13.008
T90 11.140 0.256 11.396
T50 6.316 1.768 8.084
Peak 1.000 6.580 7.580
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
206.4210 -44.0361 0.0071 23.7 -0.6 1.4328 27.1 TRIG_01121751
------------------------------------------
Foreground time interval of the image:
-0.200 8.513 (delta_t = 8.713 [sec])
Background time interval of the image:
-239.488 -103.648 (delta_t = 135.840 [sec])
-102.488 -55.148 (delta_t = 47.340 [sec])
-51.488 -0.200 (delta_t = 51.288 [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 -0.200 sec. to 13.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43872 ( -0.0968399 0.0971665 )
Norm@50keV : 9.18183E-03 ( -0.000488133 0.000486414 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.91 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 57 degrees of freedom
# Null hypothesis probability = 3.706412e-01
Photon flux (15-150 keV) in 13.21 sec: 1.12840 ( -0.0604769 0.0606002 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16312e-06 ( -6.88392e-08 6.92788e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.200 sec. to 13.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30574 ( -0.394693 0.182936 )
Epeak [keV] : 266.535 ( -266.535 -266.535 )
Norm@50keV : 1.06808E-02 ( -0.00192131 0.00586728 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.54 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 56 degrees of freedom
# Null hypothesis probability = 3.482792e-01
Photon flux (15-150 keV) in 13.21 sec: 1.11959 ( -0.06502 0.06483 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15028e-06 ( -7.86656e-08 7.75823e-08 ) ergs/cm2
Band function
Time interval is from -0.200 sec. to 13.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04774 ( 1.08314 1.08314 )
beta : -1.51861 ( 1.51326 0.160953 )
Epeak [keV] : 97.9155 ( -106.154 -106.154 )
Norm@50keV : 1.53188E-02 ( -0.00559466 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.38 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 55 degrees of freedom
# Null hypothesis probability = 3.190811e-01
Photon flux (15-150 keV) in 13.21 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] : 15.6127 ( )
R^2/D10^2 : 0.109809 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 137.43 using 59 PHA bins.
# Reduced chi-squared = 2.4111 for 57 degrees of freedom
# Null hypothesis probability = 1.358093e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.349e-08 7.880e-09
25- 50 3.027e-07 2.147e-08
50-150 5.108e-07 5.119e-08
15-150 8.871e-07 5.793e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-21.9796 -200)
Norm : 4.62858 (-0.24117 0.24117)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.523e-07 8.587e-09
25- 50 2.929e-07 1.843e-08
50-150 6.424e-07 1.017e-07
15-150 1.088e-06 1.206e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.56854 (-1.56165 1.64839)
R1^2/D10^2 : 0.849331 (-0.38372 0.9793)
kT2 [keV] : 28.8488 (-5.62098 10.6838)
R2^2/D10^2 : 1.07143E-02 (-0.00688419 0.012663)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.300e-07 2.727e-08
25- 50 2.908e-07 4.960e-08
50-150 7.213e-07 1.734e-07
15-150 1.142e-06 3.227e-07
Peak spectrum fit
Power-law model
Time interval is from 6.580 sec. to 7.580 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10453 ( -0.153771 0.151317 )
Norm@50keV : 2.25153E-02 ( -0.00194731 0.00194701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.36 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.915537e-01
Photon flux (15-150 keV) in 1 sec: 2.61278 ( -0.230296 0.230536 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35064e-07 ( -2.29017e-08 2.3071e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.580 sec. to 7.580 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.856693 ( -0.674756 0.322821 )
Epeak [keV] : 248.732 ( -248.761 -248.761 )
Norm@50keV : 2.95329E-02 ( -0.00863221 0.0308502 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.86 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 56 degrees of freedom
# Null hypothesis probability = 2.748563e-01
Photon flux (15-150 keV) in 1 sec: 2.58601 ( -0.23983 0.239 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31219e-07 ( -2.5318e-08 2.48e-08 ) ergs/cm2
Band function
Time interval is from 6.580 sec. to 7.580 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.598513 ( 0.675422 2.43533 )
beta : -1.29550 ( 1.26515 0.287407 )
Epeak [keV] : 131.475 ( -131.061 328.732 )
Norm@50keV : 4.09654E-02 ( -0.0198018 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.49 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Null hypothesis probability = 2.548639e-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] : 19.0841 (-2.12423 2.54314)
R^2/D10^2 : 0.142629 (-0.0475557 0.0673922)
(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 1.019e-08 1.804e-09
25- 50 4.918e-08 5.955e-09
50-150 1.318e-07 2.095e-08
15-150 1.911e-07 2.570e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-18.9002 -200)
Norm : 10.6061 (-0.946413 0.946413)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.640e-08 1.091e-08
25- 50 5.079e-08 1.423e-08
50-150 1.114e-07 4.795e-08
15-150 1.886e-07 8.898e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.8664 (-4.44231 3.70719)
R1^2/D10^2 : 0.575110 (-0.31048 1.78115)
kT2 [keV] : 45.9747 (-20.8074 -46.4602)
R2^2/D10^2 : 7.11552E-03 (-0.00670048 0.0408679)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.590e-08 6.969e-09
25- 50 5.180e-08 2.511e-08
50-150 1.652e-07 8.359e-08
15-150 2.329e-07 1.096e-07
Plot creation:
Sat Aug 27 14:29:01 EDT 2022