batgrbproduct analysis for trigger=1073821
batgrbproduct Analysis for Trigger=1073821
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 Sep 19 14:19:04 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1073821/GCN5_download_cron
======================================================================
Trigger: 01073821 Segment: 000
BAT Trigger Time: 653644728 [s; MET]
Trigger Stop: 653644792 [s; MET]
UTC: 2021-09-18T07:58:20.251580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 250.455126506539 Dec: -45.5397453626476 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.79
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.79
Flight Position: [ source = BAT ]
RA: 250.455126506539 Dec: -45.5397453626476 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 250.413009049231 Dec: -45.5774332181647 [deg; J2000]
{ 16h 41m 39.1s , -45d 34' 38.8" }
+/- 3.11633985396326 [arcmin] (estimated 90% radius based on SNR)
+/- 1.79061404762493 [arcmin] (formal 1-sigma fit error)
SNR: 5.99668868374722
Angular difference between Flight and Ground position is 2.871250 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.638281 0.291226 0.073605 -0.037125
0.073067 0.066410 0.054604 0.048609 [error]
Peak 0.638281 0.291226 0.073605 -0.037125
0.073067 0.066410 0.054604 0.048609 [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 1.74e-07 1.34e-07 6.96e-08 5.20e-08 4.02e-07 4.30e-07 erg/cm2
Error 3.44e-08 3.36e-08 3.47e-08 4.72e-08 9.41e-08 1.18e-07 erg/cm2
Peak flux Power-law 9.05e-02 3.93e-02 1.02e-02 3.24e-03 1.42e-01 1.43e-01 ph/cm2/s
Error 1.82e-02 9.40e-03 4.91e-03 2.75e-03 2.62e-02 2.66e-02 ph/cm2/s
Fluence Cutoff-PL 1.94e-07 1.23e-07 7.44e-10 2.78e-16 3.18e-07 3.18e-07 erg/cm2
Error 4.04e-08 4.56e-08 5.42e-09 7.14e-12 6.13e-08 6.13e-08 erg/cm2
Peak flux Cutoff-PL 9.65e-02 3.98e-02 1.35e-04 2.62e-11 1.36e-01 1.36e-01 ph/cm2/s
Error 2.11e-02 1.33e-02 9.28e-04 6.51e-07 2.48e-02 2.48e-02 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 2.950 0.433 - - 5.35e-04 2.02e-04 73.540 57
CPL -6.847 -0.611 22.4 2.7 1.47e+04 2.30e+06 62.930 56
The chi2 of BB fit is 65.10 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.950 0.433 - - 5.35e-04 2.02e-04 73.540 57
CPL -6.847 -0.611 22.4 2.7 1.47e+04 2.30e+06 62.930 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
250.4130 -45.5774 0.0321 22.4 -139.3 0.9566 6.0 TRIG_01073821
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.95002 ( -0.399841 0.466226 )
Norm@50keV : 5.34733E-04 ( -0.000193011 0.000211216 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.54 using 59 PHA bins.
# Reduced chi-squared = 1.290 for 57 degrees of freedom
# Null hypothesis probability = 6.927431e-02
Photon flux (15-150 keV) in 64 sec: 0.141836 ( -0.0261244 0.026181 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.02036e-07 ( -9.05242e-08 9.7657e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.84674 ( 6.86151 5.63952 )
Epeak [keV] : 22.3961 ( -3.19451 2.23614 )
Norm@50keV : 1.46822E+04 ( -15766.5 4.57854e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.93 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 56 degrees of freedom
# Null hypothesis probability = 2.445438e-01
Photon flux (15-150 keV) in 64 sec: 0.136373 ( -0.024717 0.024843 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17868e-07 ( -5.94509e-08 6.31802e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.42023 -5 )
beta : -5.90573 ( 6.01474 2.47643 )
Epeak [keV] : 22.0905 ( -1.43904 2.41738 )
Norm@50keV : 549.679 ( -94.5431 835.917 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.84 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 55 degrees of freedom
# Null hypothesis probability = 2.183860e-01
Photon flux (15-150 keV) in 64 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] : 5.20229 (-0.730042 0.858009)
R^2/D10^2 : 1.05258 (-0.534656 1.08706)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.10 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 57 degrees of freedom
# Null hypothesis probability = 2.155090e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.915e-07 6.259e-08
25- 50 1.378e-07 5.924e-08
50-150 6.762e-09 5.174e-09
15-150 3.360e-07 1.092e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.1858 (-5.0001 7.82573)
Norm : 2.12403 (-0.795865 1.2636)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.832e-07 4.931e-08
25- 50 1.416e-07 5.136e-08
50-150 3.246e-08 2.433e-08
15-150 3.573e-07 1.041e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.07528 (-5.06579 0.474904)
R1^2/D10^2 : 1.14704 (-1.1561 1.45386)
kT2 [keV] : 21.7450 (-21.5724 -21.5724)
R2^2/D10^2 : 3.42268E-04 (-0.000356256 2.03895)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.914e-07 9.472e-08
25- 50 1.385e-07 8.209e-08
50-150 4.134e-08 2.654e-08
15-150 3.712e-07 1.975e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.95002 ( -0.399841 0.466226 )
Norm@50keV : 5.34733E-04 ( -0.000193011 0.000211216 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.54 using 59 PHA bins.
# Reduced chi-squared = 1.290 for 57 degrees of freedom
# Null hypothesis probability = 6.927431e-02
Photon flux (15-150 keV) in 64 sec: 0.141836 ( -0.0261244 0.026181 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.02036e-07 ( -9.05242e-08 9.7657e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.84674 ( 6.86151 5.63952 )
Epeak [keV] : 22.3961 ( -3.19451 2.23614 )
Norm@50keV : 1.46822E+04 ( -15766.5 4.5781e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.93 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 56 degrees of freedom
# Null hypothesis probability = 2.445438e-01
Photon flux (15-150 keV) in 64 sec: 0.136373 ( -0.024717 0.024843 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17868e-07 ( -5.94509e-08 6.31802e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.42023 -5 )
beta : -5.90573 ( 6.01474 2.47643 )
Epeak [keV] : 22.0905 ( -1.43904 2.41738 )
Norm@50keV : 549.679 ( -94.5431 835.917 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.84 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 55 degrees of freedom
# Null hypothesis probability = 2.183860e-01
Photon flux (15-150 keV) in 64 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] : 5.20229 (-0.730042 0.858009)
R^2/D10^2 : 1.05258 (-0.534656 1.08706)
(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 1.915e-07 7.664e-08
25- 50 1.378e-07 5.550e-08
50-150 6.762e-09 5.068e-09
15-150 3.360e-07 1.102e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.1858 (-5.0001 7.82573)
Norm : 2.12403 (-0.795865 1.2636)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.832e-07 4.736e-08
25- 50 1.416e-07 4.822e-08
50-150 3.246e-08 2.279e-08
15-150 3.573e-07 1.076e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.07528 (-5.06579 0.474904)
R1^2/D10^2 : 1.14704 (-1.1561 1.45386)
kT2 [keV] : 21.7450 (-21.5724 -21.5724)
R2^2/D10^2 : 3.42268E-04 (-0.000356256 2.03895)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.914e-07 1.025e-07
25- 50 1.385e-07 8.176e-08
50-150 4.134e-08 2.342e-08
15-150 3.712e-07 1.903e-07
Plot creation:
Sun Sep 19 14:25:22 EDT 2021