batgrbproduct analysis for trigger=1091527
batgrbproduct Analysis for Trigger=1091527
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 Jan 2 06:27:56 EST 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1091527/GCN5_download_cron
======================================================================
Trigger: 01091527 Segment: 000
BAT Trigger Time: 662706639.872 [s; MET]
Trigger Stop: 662706640.896 [s; MET]
UTC: 2022-01-01T05:10:11.514060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 1.37998432654438 Dec: 31.7525909746098 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.24
Image Trigger?: NO
Rate S/N Ratio: 20.3960780543711 [ if not an image trigger ]
Image S/N Ratio: 11.24
Flight Position: [ source = BAT ]
RA: 1.37998432654438 Dec: 31.7525909746098 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 1.35983708319645 Dec: 31.7577616758158 [deg; J2000]
{ 00h 05m 26.4s , +31d 45' 27.9" }
+/- 2.18254369657647 [arcmin] (estimated 90% radius based on SNR)
+/- 0.901328229911932 [arcmin] (formal 1-sigma fit error)
SNR: 9.97437283755482
Angular difference between Flight and Ground position is 1.073677 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 173.671999931335 +/- 12.5011616662459
Measured from: 1.14400017261505
to: 174.816000103951 [s; relative to TRIGTIME]
T50: 36.6599999666214 +/- 1.04369342011193
Measured from: 77.8520001173019
to: 114.512000083923 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 89.0720000267029
to: 90.0720000267029 [s; relative to TRIGTIME]
Total Fluence
Measured from: -58.0759999752045
to: 259.108000040054 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.212679 12.751988 11.748906 3.386861
0.131878 0.141017 0.129163 0.110403 [error]
Peak 0.166769 0.297181 0.325789 0.102734
0.009336 0.011481 0.011855 0.008262 [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 2.83e-06 5.72e-06 9.01e-06 3.14e-05 2.51e-05 4.90e-05 erg/cm2
Error 1.03e-07 1.22e-07 1.56e-07 1.30e-06 4.04e-07 1.34e-06 erg/cm2
Peak flux Power-law 1.77e+00 2.27e+00 2.12e+00 3.49e+00 7.33e+00 9.65e+00 ph/cm2/s
Error 1.42e-01 1.11e-01 9.43e-02 3.30e-01 3.03e-01 4.16e-01 ph/cm2/s
Fluence Cutoff-PL 2.65e-06 5.75e-06 9.22e-06 2.48e-05 2.48e-05 4.24e-05 erg/cm2
Error 1.44e-07 1.25e-07 1.97e-07 3.44e-06 4.29e-07 3.43e-06 erg/cm2
Peak flux Cutoff-PL 1.61e+00 2.31e+00 2.22e+00 2.48e+00 7.24e+00 8.62e+00 ph/cm2/s
Error 1.80e-01 1.20e-01 1.21e-01 6.54e-01 3.12e-01 7.20e-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 1.344 0.030 - - 8.08e-03 1.34e-04 50.790 57
CPL 1.130 0.128 248.9 161.2 9.89e-03 1.17e-03 42.340 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.096 0.069 - - 6.32e-02 2.54e-03 60.980 57
CPL 0.736 0.286 202.4 243.6 9.16e-02 2.68e-02 55.950 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: 135.104000 sec.
T50 in the 50-300 keV band: 27.840000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 317.184 -58.076 259.108
T90 173.672 1.144 174.816
T50 36.660 77.852 114.512
Peak 1.000 89.072 90.072
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
1.3598 +31.7578 0.0192 33.5 -148.7 2.8416 10.0 TRIG_01091527
------------------------------------------
Foreground time interval of the image:
-58.076 13.929 (delta_t = 72.005 [sec])
Background time interval of the image:
-78.371 -58.076 (delta_t = 20.295 [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 -58.076 sec. to 259.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34381 ( -0.0304949 0.0304078 )
Norm@50keV : 8.08132E-03 ( -0.000133787 0.000133633 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.79 using 59 PHA bins.
# Reduced chi-squared = 0.8911 for 57 degrees of freedom
# Null hypothesis probability = 7.057478e-01
Photon flux (15-150 keV) in 317.2 sec: 0.972337 ( -0.01861 0.0186736 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5071e-05 ( -4.03659e-07 4.03697e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -58.076 sec. to 259.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13022 ( -0.12945 0.126015 )
Epeak [keV] : 248.857 ( -70.2588 252.213 )
Norm@50keV : 9.88975E-03 ( -0.00108751 0.00125292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.34 using 59 PHA bins.
# Reduced chi-squared = 0.7561 for 56 degrees of freedom
# Null hypothesis probability = 9.113044e-01
Photon flux (15-150 keV) in 317.2 sec: 0.954962 ( -0.020836 0.020969 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.48439e-05 ( -4.29235e-07 4.27998e-07 ) ergs/cm2
Band function
Time interval is from -58.076 sec. to 259.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.922115 ( -0.297907 0.559045 )
beta : -1.43994 ( 1.44219 0.0716896 )
Epeak [keV] : 128.395 ( -74.8545 262.594 )
Norm@50keV : 1.27986E-02 ( -0.00320867 0.0121645 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.42 using 59 PHA bins.
# Reduced chi-squared = 0.7531 for 55 degrees of freedom
# Null hypothesis probability = 9.122997e-01
Photon flux (15-150 keV) in 317.2 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] : 20.2266 ( )
R^2/D10^2 : 4.01301E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 699.99 using 59 PHA bins.
# Reduced chi-squared = 12.281 for 57 degrees of freedom
# Null hypothesis probability = 1.725087e-111
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.994e-07 3.537e-08
25- 50 5.015e-06 1.332e-07
50-150 1.523e-05 3.553e-07
15-150 2.125e-05 3.917e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 4.20037 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.318e-06 6.344e-08
25- 50 6.382e-06 1.205e-07
50-150 1.400e-05 2.553e-07
15-150 2.370e-05 4.584e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.77928 (-0.635074 0.671241)
R1^2/D10^2 : 0.401103 (-0.0827473 0.111582)
kT2 [keV] : 32.7968 (-2.15511 2.66937)
R2^2/D10^2 : 6.45015E-03 (-0.00152217 0.0017481)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.209e-06 1.484e-07
25- 50 5.928e-06 1.951e-07
50-150 1.653e-05 4.996e-07
15-150 2.467e-05 8.073e-07
Peak spectrum fit
Power-law model
Time interval is from 89.072 sec. to 90.072 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09612 ( -0.068872 0.0685585 )
Norm@50keV : 6.32325E-02 ( -0.00254327 0.00254221 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.98 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.350068e-01
Photon flux (15-150 keV) in 1 sec: 7.33182 ( -0.303287 0.303486 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.61931e-07 ( -2.89932e-08 2.905e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 89.072 sec. to 90.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.736118 ( -0.295015 0.276355 )
Epeak [keV] : 202.371 ( -65.6881 421.502 )
Norm@50keV : 9.16302E-02 ( -0.0222183 0.0313246 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.95 using 59 PHA bins.
# Reduced chi-squared = 0.9991 for 56 degrees of freedom
# Null hypothesis probability = 4.766899e-01
Photon flux (15-150 keV) in 1 sec: 7.23625 ( -0.31145 0.31171 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.5362e-07 ( -3.0302e-08 3.0167e-08 ) ergs/cm2
Band function
Time interval is from 89.072 sec. to 90.072 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.651302 ( -0.338758 3.57917 )
beta : -1.38125 ( 1.37805 0.244058 )
Epeak [keV] : 165.734 ( -120.452 337.49 )
Norm@50keV : 0.101592 ( -0.0302549 0.119392 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.48 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 55 degrees of freedom
# Null hypothesis probability = 4.566460e-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] : 20.8738 ( )
R^2/D10^2 : 0.307777 ( )
(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 2.540e-08 1.855e-09
25- 50 1.301e-07 7.750e-09
50-150 4.222e-07 2.695e-08
15-150 5.777e-07 2.770e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 30.1100 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.498e-08 3.085e-09
25- 50 1.442e-07 6.650e-09
50-150 3.163e-07 1.425e-08
15-150 5.355e-07 2.385e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.96823 (-1.69336 2.26388)
R1^2/D10^2 : 3.31920 (-1.66134 3.83953)
kT2 [keV] : 30.8198 (-4.00367 7.62633)
R2^2/D10^2 : 7.50625E-02 (-0.039829 0.0469808)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.897e-08 8.935e-09
25- 50 1.344e-07 1.565e-08
50-150 4.711e-07 6.355e-08
15-150 6.545e-07 7.120e-08
Plot creation:
Sun Jan 2 06:39:39 EST 2022