batgrbproduct analysis for trigger=1110821
batgrbproduct Analysis for Trigger=1110821
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 Jun 19 11:47:22 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1110821/GCN5_download_cron
======================================================================
Trigger: 01110821 Segment: 000
BAT Trigger Time: 677236259.264 [s; MET]
Trigger Stop: 677236261.312 [s; MET]
UTC: 2022-06-18T09:10:29.923380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 38.9662491492886 Dec: 55.2135808003858 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.03
Image Trigger?: NO
Rate S/N Ratio: 7.14142842854285 [ if not an image trigger ]
Image S/N Ratio: 9.03
Flight Position: [ source = BAT ]
RA: 38.9662491492886 Dec: 55.2135808003858 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 38.9860082551592 Dec: 55.2180434141006 [deg; J2000]
{ 02h 35m 56.6s , +55d 13' 05.0" }
+/- 2.03527481904523 [arcmin] (estimated 90% radius based on SNR)
+/- 0.884027965980396 [arcmin] (formal 1-sigma fit error)
SNR: 11.0211850668917
Angular difference between Flight and Ground position is 0.727412 arcmin
Partial Coding Fraction: 0.2167969 [ including projection effects ]
Duration
T90: 96 +/- 65.9696900098826
Measured from: -15.2639999389648
to: 80.7360000610352 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: -15.2639999389648
to: 16.7360000610352 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.23599994182587
to: 9.23599994182587 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.2640000581741
to: 128.735999941826 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.731667 1.431160 1.188340 -0.027320
0.120170 0.125734 0.110197 0.093889 [error]
Peak 0.028228 0.027155 0.027808 0.004243
0.013563 0.015211 0.012906 0.010947 [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 3.63e-07 6.25e-07 8.20e-07 2.19e-06 2.40e-06 3.99e-06 erg/cm2
Error 6.00e-08 6.63e-08 1.06e-07 5.81e-07 2.63e-07 6.72e-07 erg/cm2
Peak flux Power-law 2.90e-01 2.74e-01 1.79e-01 1.81e-01 8.17e-01 9.24e-01 ph/cm2/s
Error 2.16e-01 1.35e-01 1.38e-01 2.25e-01 3.88e-01 4.19e-01 ph/cm2/s
Fluence Cutoff-PL 2.87e-07 7.11e-07 8.94e-07 5.23e-07 2.24e-06 2.41e-06 erg/cm2
Error 7.16e-08 8.57e-08 1.28e-07 4.18e-07 2.76e-07 4.85e-07 erg/cm2
Peak flux Cutoff-PL 1.87e-01 3.06e-01 2.16e-01 5.34e-02 7.52e-01 7.68e-01 ph/cm2/s
Error 2.52e-01 1.69e-01 2.13e-01 2.07e-01 5.89e-01 6.46e-01 ph/cm2/s
Fluence Band 2.95e-07 6.93e-07 8.97e-07 6.73e-07 2.30e-06 2.57e-06 erg/cm2
Error 6.78e-08 8.84e-08 -------- -------- -------- 5.01e-07 erg/cm2
Peak flux Band 1.76e-01 6.36e-01 2.91e-01 6.01e-03 1.11e+00 1.11e+00 ph/cm2/s
Error 7.43e-02 2.03e-01 1.07e-01 -------- 3.44e-01 3.46e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.608 0.164 - - 1.79e-03 1.86e-04 63.410 57
CPL 0.262 0.847 65.0 16.9 8.46e-03 1.02e-02 53.400 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.612 0.820 - - 6.34e-03 2.96e-03 53.910 57
CPL -0.202 0.878 65.0 0.0 4.54e-02 0.00e+00 53.440 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: 17.856000 sec.
T50 in the 50-300 keV band: 8.896000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 144.000 -15.264 128.736
T90 96.000 -15.264 80.736
T50 32.000 -15.264 16.736
Peak 1.000 8.236 9.236
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
38.9860 +55.2180 0.0175 47.0 -41.2 2.6768 11.0 TRIG_01110821
------------------------------------------
Foreground time interval of the image:
-15.264 20.956 (delta_t = 36.220 [sec])
Background time interval of the image:
-62.963 -27.134 (delta_t = 35.829 [sec])
-26.264 -15.264 (delta_t = 11.000 [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
Multiple GTIs in the spectrum
tstart tstop
-15.264000 20.956000
21.736000 128.736000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60791 ( -0.162345 0.164672 )
Norm@50keV : 1.79492E-03 ( -0.00018636 0.000185696 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.41 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 57 degrees of freedom
# Null hypothesis probability = 2.608187e-01
Photon flux (15-150 keV) in 143.2 sec: 0.231223 ( -0.0243041 0.0243733 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.40152e-06 ( -2.61709e-07 2.63299e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-15.264000 20.956000
21.736000 128.736000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.261876 ( -0.926223 0.768639 )
Epeak [keV] : 65.0076 ( -10.3694 23.3611 )
Norm@50keV : 8.45766E-03 ( -0.00489332 0.0154762 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.40 using 59 PHA bins.
# Reduced chi-squared = 0.9536 for 56 degrees of freedom
# Null hypothesis probability = 5.739310e-01
Photon flux (15-150 keV) in 143.2 sec: 0.219545 ( -0.025103 0.025197 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24258e-06 ( -2.7344e-07 2.78223e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-15.264000 20.956000
21.736000 128.736000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.261665 ( -0.522174 1.3527 )
beta : -10.0000 ( 10 5.32907e-15 )
Epeak [keV] : 64.9937 ( -10.3726 20.5402 )
Norm@50keV : 8.46035E-03 ( -0.00489804 0.0154611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.40 using 59 PHA bins.
# Reduced chi-squared = 0.9709 for 55 degrees of freedom
# Null hypothesis probability = 5.360058e-01
Photon flux (15-150 keV) in 143.2 sec: 0.222484 ( 6.77752 -0.028943 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29925e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.6047 (-1.50393 1.69408)
R^2/D10^2 : 2.96751E-02 (-0.00985069 0.0144227)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.82 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 57 degrees of freedom
# Null hypothesis probability = 3.081854e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.905e-07 3.673e-08
25- 50 7.384e-07 1.012e-07
50-150 1.059e-06 2.007e-07
15-150 1.988e-06 2.427e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 160.823 (-55.942 -160.025)
Norm : 0.963961 (-0.106151 0.128668)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.523e-07 6.179e-08
25- 50 6.595e-07 2.527e-07
50-150 1.339e-06 7.029e-07
15-150 2.350e-06 1.038e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.35265 (-3.22252 4.00827)
R1^2/D10^2 : 0.156600 (-0.107098 0.929899)
kT2 [keV] : 19.9078 (-4.25738 12.5958)
R2^2/D10^2 : 7.40673E-03 (-0.00657633 0.0123377)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.856e-07 1.602e-07
25- 50 7.104e-07 3.719e-07
50-150 1.244e-06 6.694e-07
15-150 2.240e-06 1.133e-06
Peak spectrum fit
Power-law model
Time interval is from 8.236 sec. to 9.236 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61223 ( -0.791805 0.847306 )
Norm@50keV : 6.33646E-03 ( -0.00300042 0.00291077 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.91 using 59 PHA bins.
# Reduced chi-squared = 0.9459 for 57 degrees of freedom
# Null hypothesis probability = 5.915890e-01
Photon flux (15-150 keV) in 1 sec: 0.817386 ( -0.385908 0.39045 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.91731e-08 ( -2.83085e-08 2.87431e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.236 sec. to 9.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.201673 ( 0.248596 2.00451 )
Epeak [keV] : 64.9768 ( )
Norm@50keV : 4.53931E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.44 using 59 PHA bins.
# Reduced chi-squared = 0.9543 for 56 degrees of freedom
# Null hypothesis probability = 5.723627e-01
Photon flux (15-150 keV) in 1 sec: 0.751844 ( -0.751844 0.425326 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.56268e-08 ( -5.56268e-08 3.01399e-08 ) ergs/cm2
Band function
Time interval is from 8.236 sec. to 9.236 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -5.73793E-02 ( 0.979582 0.979582 )
beta : -3.05167 ( 2.23756 5.98924 )
Epeak [keV] : 65.1324 ( -65.144 110.512 )
Norm@50keV : 3.61315E-02 ( -0.0442762 1.20495e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.40 using 59 PHA bins.
# Reduced chi-squared = 0.9709 for 55 degrees of freedom
# Null hypothesis probability = 5.359405e-01
Photon flux (15-150 keV) in 1 sec: 1.10882 ( 5.89118 -0.33366 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.30224e-08 ( -7.30154e-08 -2.23593e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.0043 (-5.29346 9.05881)
R^2/D10^2 : 7.86168E-02 (-0.0786166 0.246888)
(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 4.163e-09 2.861e-09
25- 50 1.752e-08 1.114e-08
50-150 3.138e-08 2.203e-08
15-150 5.306e-08 3.741e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 191.265 (-187.202 -187.202)
Norm : 3.34170 (-1.52009 2.6251)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.365e-09 5.405e-09
25- 50 1.601e-08 1.027e-08
50-150 3.463e-08 2.139e-08
15-150 5.901e-08 3.737e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.408654 (-2.98531 20.9074)
R1^2/D10^2 : 8.44306E+13 (-9.16357e+13 5.35784e+18)
kT2 [keV] : 16.3906 (-5.37056 9.68811)
R2^2/D10^2 : 7.06824E-02 (-0.0585832 0.146177)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.426e-09 5.650e-09
25- 50 1.563e-08 9.585e-09
50-150 3.256e-08 2.366e-08
15-150 5.662e-08 3.453e-08
Plot creation:
Sun Jun 19 11:51:47 EDT 2022