batgrbproduct analysis for trigger=1088940
batgrbproduct Analysis for Trigger=1088940
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 Dec 12 15:33:41 EST 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1088940/GCN5_download_cron
======================================================================
Trigger: 01088940 Segment: 000
BAT Trigger Time: 660921027.872 [s; MET]
Trigger Stop: 660921027.936 [s; MET]
UTC: 2021-12-11T13:09:59.634260 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 212.272224151866 Dec: 27.883504540405 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.49
Image Trigger?: NO
Rate S/N Ratio: 60.8769250208977 [ if not an image trigger ]
Image S/N Ratio: 11.49
Flight Position: [ source = BAT ]
RA: 212.272224151866 Dec: 27.883504540405 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 212.271951643762 Dec: 27.8842658374054 [deg; J2000]
{ 14h 09m 05.3s , +27d 53' 03.4" }
+/- 0.797856883958364 [arcmin] (estimated 90% radius based on SNR)
+/- 0.34197988584849 [arcmin] (formal 1-sigma fit error)
SNR: 41.9977020184934
Angular difference between Flight and Ground position is 0.047910 arcmin
Partial Coding Fraction: 0.2167969 [ including projection effects ]
Duration
T90: 50.3239998817444 +/- 0.462497603225686
Measured from: 2.93200016021729
to: 53.2560000419617 [s; relative to TRIGTIME]
T50: 21.0639998912811 +/- 0.178885427537588
Measured from: 6.85600018501282
to: 27.9200000762939 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.8639999628067
to: 7.8639999628067 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 122.259999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 55.060258 80.161321 64.725872 18.771978
0.227645 0.280092 0.275267 0.197614 [error]
Peak 2.990437 6.007562 6.972634 2.692942
0.063065 0.088979 0.100835 0.080546 [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 2.12e-05 3.75e-05 5.10e-05 1.43e-04 1.48e-04 2.52e-04 erg/cm2
Error 5.73e-07 6.22e-07 5.53e-07 3.46e-06 1.66e-06 3.48e-06 erg/cm2
Peak flux Power-law 3.55e+01 4.72e+01 4.62e+01 8.10e+01 1.55e+02 2.10e+02 ph/cm2/s
Error 1.49e+00 1.20e+00 9.03e-01 3.48e+00 3.13e+00 4.10e+00 ph/cm2/s
Fluence Cutoff-PL 2.04e-05 3.75e-05 5.17e-05 1.31e-04 1.47e-04 2.40e-04 erg/cm2
Error 8.24e-07 6.30e-07 7.45e-07 8.25e-06 1.70e-06 9.71e-06 erg/cm2
Peak flux Cutoff-PL 3.27e+01 4.75e+01 4.78e+01 6.49e+01 1.54e+02 1.93e+02 ph/cm2/s
Error 2.02e+00 1.23e+00 1.23e+00 7.84e+00 3.28e+00 8.68e+00 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- 5.50e+00 -------- 4.15e+01 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 1.558 0.020 - - 1.31e-01 1.61e-03 30.320 57
CPL 1.456 0.082 356.7 385.8 1.43e-01 7.71e-03 25.870 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.032 0.034 - - 1.35e+00 2.61e-02 50.890 57
CPL 0.777 0.142 297.1 176.7 1.72e+00 2.27e-01 41.080 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: 43.072000 sec.
T50 in the 50-300 keV band: 17.088000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 122.260 0.000 122.260
T90 50.324 2.932 53.256
T50 21.064 6.856 27.920
Peak 1.000 6.864 7.864
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
212.2720 +27.8843 0.0046 41.5 -53.4 88.9849 42.0 TRIG_01088940
------------------------------------------
Foreground time interval of the image:
0.000 8.629 (delta_t = 8.629 [sec])
Background time interval of the image:
-239.872 -184.882 (delta_t = 54.990 [sec])
-183.872 -108.372 (delta_t = 75.500 [sec])
-106.872 -34.872 (delta_t = 72.000 [sec])
-33.872 0.000 (delta_t = 33.872 [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
0.000000 67.848000
69.128000 70.398000
71.128000 122.260000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55840 ( -0.0201601 0.020076 )
Norm@50keV : 0.130563 ( -0.00160944 0.00160597 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 30.32 using 59 PHA bins.
# Reduced chi-squared = 0.5320 for 57 degrees of freedom
# Null hypothesis probability = 9.985775e-01
Photon flux (15-150 keV) in 120.2 sec: 16.5688 ( -0.264666 0.266282 ) ph/cm2/s
Energy fluence (15-150 keV) : 0.000147568 ( -1.65626e-06 1.65672e-06 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 67.848000
69.128000 70.398000
71.128000 122.260000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45591 ( -0.0838764 0.0799847 )
Epeak [keV] : 356.734 ( -128.691 643.002 )
Norm@50keV : 0.142584 ( -0.00501926 0.0104089 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 25.87 using 59 PHA bins.
# Reduced chi-squared = 0.4619 for 56 degrees of freedom
# Null hypothesis probability = 9.998113e-01
Photon flux (15-150 keV) in 120.2 sec: 16.3648 ( -0.3053 0.3061 ) ph/cm2/s
Energy fluence (15-150 keV) : 0.000147143 ( 0 0 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 67.848000
69.128000 70.398000
71.128000 122.260000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.969867 ( -0.381948 0.806248 )
beta : -1.59852 ( -0.0360471 0.031121 )
Epeak [keV] : 74.3535 ( -29.7242 91.7335 )
Norm@50keV : 0.266542 ( -0.104319 0.656624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 19.51 using 59 PHA bins.
# Reduced chi-squared = 0.3548 for 55 degrees of freedom
# Null hypothesis probability = 9.999976e-01
Photon flux (15-150 keV) in 120.2 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] : 21.5845 ( )
R^2/D10^2 : 0.486084 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1958.95 using 59 PHA bins.
# Reduced chi-squared = 34.3675 for 57 degrees of freedom
# Null hypothesis probability = 0.000000e+00
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.081e-06 1.274e-07
25- 50 2.656e-05 5.109e-07
50-150 9.240e-05 1.160e-06
15-150 1.240e-04 1.442e-06
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 68.8065 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.059e-05 3.185e-07
25- 50 3.962e-05 6.130e-07
50-150 8.689e-05 1.280e-06
15-150 1.471e-04 2.104e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.08995 (-0.363631 0.376103)
R1^2/D10^2 : 6.96625 (-0.909026 1.07622)
kT2 [keV] : 34.1789 (-1.3407 1.52359)
R2^2/D10^2 : 7.68235E-02 (-0.0112017 0.0121713)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.509e-05 6.431e-07
25- 50 3.929e-05 7.993e-07
50-150 8.951e-05 1.557e-06
15-150 1.439e-04 2.043e-06
Peak spectrum fit
Power-law model
Time interval is from 6.864 sec. to 7.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03193 ( -0.0336945 0.0335669 )
Norm@50keV : 1.34793 ( -0.0261622 0.0261228 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.89 using 59 PHA bins.
# Reduced chi-squared = 0.8929 for 57 degrees of freedom
# Null hypothesis probability = 7.022075e-01
Photon flux (15-150 keV) in 1 sec: 155.482 ( -3.13037 3.13531 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44144e-05 ( -2.81411e-07 2.81418e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.864 sec. to 7.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.776955 ( -0.144104 0.139933 )
Epeak [keV] : 297.128 ( -84.1821 269.193 )
Norm@50keV : 1.71650 ( -0.208967 0.24447 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.08 using 59 PHA bins.
# Reduced chi-squared = 0.7335 for 56 degrees of freedom
# Null hypothesis probability = 9.324924e-01
Photon flux (15-150 keV) in 1 sec: 153.561 ( -3.272 3.279 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43288e-05 ( 0 0 ) ergs/cm2
Band function
Time interval is from 6.864 sec. to 7.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99995 ( -14.9995 -4.99995 )
beta : -1.05391 ( -0.0353928 0.0353977 )
Epeak [keV] : 28.0118 ( -7.53054 3.29804 )
Norm@50keV : 4.65851E+04 ( -865.451 253106 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.64 using 59 PHA bins.
# Reduced chi-squared = 0.8662 for 55 degrees of freedom
# Null hypothesis probability = 7.490522e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.92338e-06 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 23.0659 ( )
R^2/D10^2 : 4.79766 ( )
(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 4.619e-07 1.755e-08
25- 50 2.510e-06 6.950e-08
50-150 9.975e-06 2.765e-07
15-150 1.295e-05 2.700e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 661.385 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.647e-06 3.500e-08
25- 50 3.168e-06 6.450e-08
50-150 6.948e-06 1.355e-07
15-150 1.176e-05 2.200e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.5187 (-0.952239 1.0162)
R1^2/D10^2 : 31.7055 (-6.76017 9.40278)
kT2 [keV] : 41.1884 (-4.12923 5.89478)
R2^2/D10^2 : 0.645453 (-0.214646 0.257608)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.638e-07 6.120e-08
25- 50 2.886e-06 1.255e-07
50-150 1.059e-05 6.715e-07
15-150 1.434e-05 7.250e-07
Plot creation:
Sun Dec 12 15:40:42 EST 2021