batgrbproduct analysis for trigger=1071762
batgrbproduct Analysis for Trigger=1071762
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 Sep 4 19:44:03 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1071762/GCN5_download_cron
======================================================================
Trigger: 01071762 Segment: 000
BAT Trigger Time: 652369592 [s; MET]
Trigger Stop: 652369664 [s; MET]
UTC: 2021-09-03T13:46:04.337040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.414472660424 Dec: -40.3089146393119 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.3
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.3
Flight Position: [ source = BAT ]
RA: 135.414472660424 Dec: -40.3089146393119 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.475295824266 Dec: -40.2964673212388 [deg; J2000]
{ 09h 01m 54.1s , -40d 17' 47.3" }
+/- 2.83794036263245 [arcmin] (estimated 90% radius based on SNR)
+/- 1.46915728541141 [arcmin] (formal 1-sigma fit error)
SNR: 6.85442231702845
Angular difference between Flight and Ground position is 2.881626 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 80 +/- 35.7770876399966
Measured from: -66.9999998807907
to: 13.0000001192093 [s; relative to TRIGTIME]
T50: 48 +/- 16
Measured from: -50.9999998807907
to: -2.99999988079071 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.5
to: 5.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: -67
to: 29 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.060223 0.867733 0.141586 0.017745
0.071726 0.075365 0.068449 0.073613 [error]
Peak 0.008153 0.016188 0.006172 0.006500
0.007085 0.007425 0.006859 0.007347 [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 3.34e-07 3.10e-07 1.99e-07 1.96e-07 9.23e-07 1.04e-06 erg/cm2
Error 3.81e-08 3.75e-08 4.85e-08 8.69e-08 1.18e-07 1.66e-07 erg/cm2
Peak flux Power-law 1.15e-01 8.88e-02 4.60e-02 3.45e-02 2.65e-01 2.84e-01 ph/cm2/s
Error 9.83e-02 7.30e-02 5.26e-02 1.12e-01 1.69e-01 1.94e-01 ph/cm2/s
Fluence Cutoff-PL 3.23e-07 3.67e-07 4.29e-08 1.20e-10 7.33e-07 7.33e-07 erg/cm2
Error 4.31e-08 5.19e-08 4.02e-08 1.49e-09 8.71e-08 8.71e-08 erg/cm2
Peak flux Cutoff-PL 1.18e-01 8.76e-02 4.30e-02 2.90e-02 2.65e-01 2.82e-01 ph/cm2/s
Error 9.90e-02 8.91e-02 -------- 1.12e-01 1.68e-01 2.35e-01 ph/cm2/s
Fluence Band 3.20e-07 3.63e-07 7.09e-08 1.14e-08 7.65e-07 7.68e-07 erg/cm2
Error 4.26e-08 -------- 7.13e-08 3.52e-08 1.11e-07 1.26e-07 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 2.640 0.222 - - 9.23e-04 1.68e-04 63.700 57
CPL -1.849 2.380 25.0 3.2 1.27e+00 3.98e+01 45.350 56
The chi2 of BB fit is 45.30 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 1.947 1.948 - - 1.81e-03 1.68e-03 40.200 57
CPL -9.999 1.115 30.6 7.3 2.10e+05 1.84e+06 38.900 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 96.000 -67.000 29.000
T90 80.000 -67.000 13.000
T50 48.000 -51.000 -3.000
Peak 1.000 4.500 5.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.4753 -40.2965 0.0281 16.9 14.8 1.4895 6.9 TRIG_01071762
------------------------------------------
Foreground time interval of the image:
-67.000 29.000 (delta_t = 96.000 [sec])
Background time interval of the image:
-179.000 -67.000 (delta_t = 112.000 [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
Time interval is from -67.000 sec. to 29.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.64010 ( -0.213314 0.230234 )
Norm@50keV : 9.22781E-04 ( -0.000165672 0.000169333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.70 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 57 degrees of freedom
# Null hypothesis probability = 2.527116e-01
Photon flux (15-150 keV) in 96 sec: 0.198019 ( -0.0194514 0.0194638 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.23492e-07 ( -1.14989e-07 1.20097e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -67.000 sec. to 29.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.84851 ( -3.14304 1.61783 )
Epeak [keV] : 25.0094 ( -3.52546 2.80928 )
Norm@50keV : 1.27417 ( -1.25927 78.2943 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.35 using 59 PHA bins.
# Reduced chi-squared = 0.8099 for 56 degrees of freedom
# Null hypothesis probability = 8.446661e-01
Photon flux (15-150 keV) in 96 sec: 0.185171 ( -0.018919 0.019022 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.32942e-07 ( -8.30736e-08 9.11174e-08 ) ergs/cm2
Band function
Time interval is from -67.000 sec. to 29.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.93585 ( -1.19127 -0.816336 )
beta : -4.80681 ( 4.29577 0.968398 )
Epeak [keV] : 24.9086 ( -3.4729 3.11983 )
Norm@50keV : 1.50132 ( -1.53492 100.1 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.55 using 59 PHA bins.
# Reduced chi-squared = 0.8101 for 55 degrees of freedom
# Null hypothesis probability = 8.419511e-01
Photon flux (15-150 keV) in 96 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.64913e-07 ( -7.64241e-07 -9.91277e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.38412 (-0.550685 0.600394)
R^2/D10^2 : 0.571095 (-0.183999 0.274374)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.30 using 59 PHA bins.
# Reduced chi-squared = 0.7947 for 57 degrees of freedom
# Null hypothesis probability = 8.681329e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.229e-07 4.411e-08
25- 50 3.675e-07 5.779e-08
50-150 4.311e-08 1.818e-08
15-150 7.334e-07 8.683e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.1985 (-4.55114 6.04725)
Norm : 1.96153 (-0.398114 0.520137)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.375e-07 4.128e-08
25- 50 3.387e-07 4.690e-08
50-150 1.372e-07 5.579e-08
15-150 8.134e-07 1.247e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.19668 (-6.19809 0.685841)
R1^2/D10^2 : 0.630855 (-0.221837 0.32623)
kT2 [keV] : 27.4540 (-27.7675 -27.7675)
R2^2/D10^2 : 2.20452E-04 (-0.00020284 0.7913)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.258e-07 6.922e-08
25- 50 3.611e-07 1.012e-07
50-150 1.217e-07 7.128e-08
15-150 8.086e-07 1.996e-07
Peak spectrum fit
Power-law model
Time interval is from 4.500 sec. to 5.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94725 ( -1.47105 2.42426 )
Norm@50keV : 1.81171E-03 ( -0.00181171 0.00155662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.20 using 59 PHA bins.
# Reduced chi-squared = 0.7052 for 57 degrees of freedom
# Null hypothesis probability = 9.552509e-01
Photon flux (15-150 keV) in 1 sec: 0.265372 ( -0.168661 0.16911 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66711e-08 ( -1.26102e-08 1.62821e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.500 sec. to 5.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.99895 ( 9.99996 12.2308 )
Epeak [keV] : 30.6062 ( -6.96481 7.60285 )
Norm@50keV : 2.09659E+05 ( -210899 3.46955e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.90 using 59 PHA bins.
# Reduced chi-squared = 0.6947 for 56 degrees of freedom
# Null hypothesis probability = 9.601719e-01
Photon flux (15-150 keV) in 1 sec: 0.264556 ( -0.167925 0.168393 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65526e-08 ( -1.2812e-08 1.61439e-08 ) ergs/cm2
Band function
Time interval is from 4.500 sec. to 5.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -14.5864 -5 )
beta : -5.98485 ( 5.54179 5.54179 )
Epeak [keV] : 29.9878 ( -29.9876 11.9728 )
Norm@50keV : 113.401 ( -68.8949 1.01237e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.56 using 59 PHA bins.
# Reduced chi-squared = 0.7193 for 55 degrees of freedom
# Null hypothesis probability = 9.421140e-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] : 7.21766 (-3.29191 9.14786)
R^2/D10^2 : 0.441673 (-0.439229 4.57107)
(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 3.811e-09 2.526e-09
25- 50 5.535e-09 3.961e-09
50-150 1.023e-09 1.122e-09
15-150 1.037e-08 7.355e-09
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 64.2691 (-64.5638 -64.5638)
Norm : 1.33203 (-1.32867 8.35562)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.382e-09 2.456e-09
25- 50 5.254e-09 3.753e-09
50-150 6.321e-09 6.895e-09
15-150 1.496e-08 1.205e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.998 (-199.998 -199.998)
R1^2/D10^2 : 4.18927E-05 (-4.18927e-05 -4.18927e-05)
kT2 [keV] : 6.66728 (-1.97883 6.13924)
R2^2/D10^2 : 0.561228 (-0.495854 1.89061)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.808e-09 1.098e-01
25- 50 5.547e-09 9.965e-01
50-150 1.031e-09 2.074e+01
15-150 1.039e-08 2.321e+01
Plot creation:
Sat Sep 4 19:49:33 EDT 2021