batgrbproduct analysis for trigger=1062336
batgrbproduct Analysis for Trigger=1062336
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 Aug 1 17:41:33 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1062336/GCN5_download_cron
======================================================================
Trigger: 01062336 Segment: 000
BAT Trigger Time: 649462896 [s; MET]
Trigger Stop: 649462984 [s; MET]
UTC: 2021-07-31T22:21:08.531520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 300.313626634788 Dec: -28.0420279574902 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.45
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.45
Flight Position: [ source = BAT ]
RA: 300.313626634788 Dec: -28.0420279574902 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 300.312054747148 Dec: -28.0545814592777 [deg; J2000]
{ 20h 01m 14.9s , -28d 03' 16.5" }
+/- 1.65314479153121 [arcmin] (estimated 90% radius based on SNR)
+/- 0.570705158306837 [arcmin] (formal 1-sigma fit error)
SNR: 14.8335696618621
Angular difference between Flight and Ground position is 0.757795 arcmin
Partial Coding Fraction: 0.390625 [ including projection effects ]
Duration
T90: 22.3680000305176 +/- 2.66364255229429
Measured from: 0.660000085830688
to: 23.0280001163483 [s; relative to TRIGTIME]
T50: 10.6039999723434 +/- 1.62617718507867
Measured from: 5.48800015449524
to: 16.0920001268387 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.2799999713898
to: 12.2799999713898 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.299999952316284
to: 25.4960000514984 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.398345 1.094199 1.252101 0.274557
0.075237 0.071408 0.061991 0.050268 [error]
Peak 0.020010 0.089448 0.080431 0.010077
0.014281 0.015332 0.012883 0.010055 [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 1.79e-07 4.40e-07 8.64e-07 4.19e-06 2.33e-06 5.68e-06 erg/cm2
Error 2.43e-08 3.62e-08 5.79e-08 6.39e-07 1.53e-07 6.62e-07 erg/cm2
Peak flux Power-law 3.57e-01 4.84e-01 4.81e-01 8.58e-01 1.60e+00 2.19e+00 ph/cm2/s
Error 1.52e-01 1.28e-01 9.85e-02 3.73e-01 3.41e-01 4.51e-01 ph/cm2/s
Fluence Cutoff-PL 1.21e-07 4.61e-07 9.82e-07 1.19e-06 2.20e-06 2.75e-06 erg/cm2
Error 3.01e-08 4.24e-08 7.55e-08 5.22e-07 1.67e-07 5.28e-07 erg/cm2
Peak flux Cutoff-PL 2.68e-01 5.07e-01 5.42e-01 3.70e-01 1.54e+00 1.69e+00 ph/cm2/s
Error 1.74e-01 1.49e-01 1.29e-01 4.94e-01 3.49e-01 6.05e-01 ph/cm2/s
Fluence Band 1.21e-07 4.63e-07 9.76e-07 1.69e-06 2.20e-06 3.26e-06 erg/cm2
Error -------- 4.73e-08 -------- -------- 1.75e-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 1.027 0.109 - - 8.45e-03 5.57e-04 68.200 57
CPL -0.331 0.608 101.9 22.9 3.15e-02 1.92e-02 48.170 56
The chi2 of BB fit is 55.05 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 1.010 0.340 - - 1.39e-02 2.88e-03 52.020 57
CPL -0.057 1.575 111.7 -35.6 4.09e-02 1.28e-01 50.380 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: 23.104000 sec.
T50 in the 50-300 keV band: 10.432000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 25.796 -0.300 25.496
T90 22.368 0.660 23.028
T50 10.604 5.488 16.092
Peak 1.000 11.280 12.280
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
300.3121 -28.0546 0.0129 29.8 112.9 3.0979 14.8 TRIG_01062336
------------------------------------------
Foreground time interval of the image:
-0.300 25.496 (delta_t = 25.796 [sec])
Background time interval of the image:
-17.599 -0.300 (delta_t = 17.299 [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 -0.300 sec. to 25.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02678 ( -0.110629 0.108073 )
Norm@50keV : 8.44576E-03 ( -0.00055833 0.000555906 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.20 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 57 degrees of freedom
# Null hypothesis probability = 1.471385e-01
Photon flux (15-150 keV) in 25.8 sec: 0.973876 ( -0.066405 0.0667041 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33399e-06 ( -1.53188e-07 1.53726e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.300 sec. to 25.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.331097 ( -0.65058 0.564937 )
Epeak [keV] : 101.936 ( -15.1237 30.6404 )
Norm@50keV : 3.14808E-02 ( -0.0129177 0.0255211 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.17 using 59 PHA bins.
# Reduced chi-squared = 0.8602 for 56 degrees of freedom
# Null hypothesis probability = 7.622788e-01
Photon flux (15-150 keV) in 25.8 sec: 0.910141 ( -0.070125 0.070632 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19981e-06 ( -1.66774e-07 1.6632e-07 ) ergs/cm2
Band function
Time interval is from -0.300 sec. to 25.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.331296 ( -0.454233 0.378827 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 101.917 ( -10.0844 30.5974 )
Norm@50keV : 3.14902E-02 ( -0.0129141 0.0245565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.17 using 59 PHA bins.
# Reduced chi-squared = 0.8758 for 55 degrees of freedom
# Null hypothesis probability = 7.310582e-01
Photon flux (15-150 keV) in 25.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19683e-06 ( -2.19665e-06 -1.7189e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.7329 (-1.56783 1.75862)
R^2/D10^2 : 3.68461E-02 (-0.00828968 0.0103171)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.05 using 59 PHA bins.
# Reduced chi-squared = 0.9658 for 57 degrees of freedom
# Null hypothesis probability = 5.484649e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.356e-08 1.059e-08
25- 50 4.386e-07 4.360e-08
50-150 1.547e-06 1.456e-07
15-150 2.069e-06 1.553e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 4.17824 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.684e-07 1.960e-08
25- 50 5.164e-07 5.173e-08
50-150 1.132e-06 2.931e-07
15-150 1.917e-06 3.110e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.1979 (-6.1118 -11.2164)
R1^2/D10^2 : 0.105972 (-0.0661884 0.757453)
kT2 [keV] : 27.9570 (-5.72782 -28.0174)
R2^2/D10^2 : 1.31801E-02 (-0.0127359 0.0195486)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.153e-07 6.459e-08
25- 50 4.675e-07 2.402e-07
50-150 1.618e-06 8.429e-07
15-150 2.200e-06 1.128e-06
Peak spectrum fit
Power-law model
Time interval is from 11.280 sec. to 12.280 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00970 ( -0.353991 0.32591 )
Norm@50keV : 1.39143E-02 ( -0.00290413 0.00286144 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.02 using 59 PHA bins.
# Reduced chi-squared = 0.9126 for 57 degrees of freedom
# Null hypothesis probability = 6.619182e-01
Photon flux (15-150 keV) in 1 sec: 1.60259 ( -0.340191 0.342307 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49932e-07 ( -3.06288e-08 3.09212e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.280 sec. to 12.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -5.68629E-02 ( -1.94415 1.20501 )
Epeak [keV] : 111.706 ( -40.5837 -111.705 )
Norm@50keV : 4.08563E-02 ( -0.0408575 0.215637 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.38 using 59 PHA bins.
# Reduced chi-squared = 0.8996 for 56 degrees of freedom
# Null hypothesis probability = 6.867099e-01
Photon flux (15-150 keV) in 1 sec: 1.53988 ( -0.34578 0.35234 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.436e-07 ( -3.2736e-08 3.2537e-08 ) ergs/cm2
Band function
Time interval is from 11.280 sec. to 12.280 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51277E-02 ( -1.32677 1.02909 )
beta : -9.37158 ( 9.37166 9.37166 )
Epeak [keV] : 116.081 ( -35.5329 98.2711 )
Norm@50keV : 3.78900E-02 ( -0.0194155 0.027431 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.38 using 59 PHA bins.
# Reduced chi-squared = 0.9161 for 55 degrees of freedom
# Null hypothesis probability = 6.513384e-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] : 21.6819 (-4.62816 6.83481)
R^2/D10^2 : 6.15210E-02 (-0.036195 0.0748759)
(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 5.388e-09 2.243e-09
25- 50 2.824e-08 1.148e-08
50-150 9.915e-08 3.838e-08
15-150 1.328e-07 4.491e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-54.464 -200)
Norm : 6.81590 (-1.42037 1.42037)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.699e-08 9.905e-09
25- 50 3.267e-08 1.880e-08
50-150 7.166e-08 4.120e-08
15-150 1.213e-07 7.060e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.9176 (-10.9782 -10.9782)
R1^2/D10^2 : 0.261877 (-0.259226 -0.259226)
kT2 [keV] : 32.5723 (-33.5774 -33.5774)
R2^2/D10^2 : 1.29150E-02 (-0.0119403 0.0789436)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.547e-09 5.890e-09
25- 50 3.120e-08 1.806e-08
50-150 1.059e-07 5.740e-08
15-150 1.456e-07 7.115e-08
Plot creation:
Sun Aug 1 17:45:58 EDT 2021