batgrbproduct analysis for trigger=1000668
batgrbproduct Analysis for Trigger=1000668
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 Oct 18 22:02:27 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger1000668/GCN5_download_cron
======================================================================
Trigger: 01000668 Segment: 000
BAT Trigger Time: 624662448 [s; MET]
Trigger Stop: 624662512 [s; MET]
UTC: 2020-10-17T21:20:22.177060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.571786634863 Dec: -40.5106334066564 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 16.99
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 16.99
Flight Position: [ source = BAT ]
RA: 135.571786634863 Dec: -40.5106334066564 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.60906574516 Dec: -40.4754794959245 [deg; J2000]
{ 09h 02m 26.2s , -40d 28' 31.7" }
+/- 5.84343112369313 [arcmin] (estimated 90% radius based on SNR)
+/- 4.78910125872411 [arcmin] (formal 1-sigma fit error)
SNR: 2.44274695649187
Angular difference between Flight and Ground position is 2.709670 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 390.304000020027 +/- 668.522510554029
Measured from: -175.895999908447
to: 214.40800011158 [s; relative to TRIGTIME]
T50: 152.192000031471 +/- 15.9849049285725
Measured from: -51.0959998369217
to: 101.09600019455 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -168.628000020981
to: -167.628000020981 [s; relative to TRIGTIME]
Total Fluence
Measured from: -193.768000006676
to: 876.200000047684 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 29.578411 17.723790 0.625779 -0.010755
0.245908 0.241242 0.200144 0.182793 [error]
Peak 0.074680 0.041515 0.007989 0.008334
0.008300 0.007797 0.005974 0.005606 [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 1.20e-05 5.93e-06 1.80e-06 6.96e-07 2.01e-05 2.04e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 6.52e-01 2.85e-01 7.44e-02 2.40e-02 1.03e+00 1.04e+00 ph/cm2/s
Error 1.23e-01 6.60e-02 3.50e-02 1.97e-02 1.79e-01 1.83e-01 ph/cm2/s
Fluence Cutoff-PL 8.53e-06 7.04e-06 3.86e-07 1.89e-10 1.60e-05 1.60e-05 erg/cm2
Error 6.57e-07 2.24e-07 8.36e-08 2.59e-10 7.17e-07 7.17e-07 erg/cm2
Peak flux Cutoff-PL 6.82e-01 3.19e-01 6.03e-03 3.55e-07 1.01e+00 1.01e+00 ph/cm2/s
Error 1.37e-01 9.45e-02 1.96e-02 3.43e-04 1.72e-01 1.72e-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 3.718 0.000 - - 1.04e-03 0.00e+00 342.250 0
CPL -2.211 0.847 22.0 1.3 9.05e+00 1.92e+01 51.410 0
The chi2 of BB fit is 51.86 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 2.938 0.420 - - 3.90e-03 1.43e-03 51.250 0
CPL -2.975 0.613 21.9 3.2 9.88e+01 8.48e+06 44.740 0
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 1069.970 -193.768 876.200
T90 390.304 -175.896 214.408
T50 152.192 -51.096 101.096
Peak 1.000 -168.628 -167.628
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.6091 -40.4755 0.0784 0.1 -172.6 11.5530 2.4 TRIG_01000668
------------------------------------------
Foreground time interval of the image:
-193.768 876.200 (delta_t = 1069.968 [sec])
Background time interval of the image:
-203.299 -193.768 (delta_t = 9.531 [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 -193.768 sec. to 876.200 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.71842 ( )
Norm@50keV : 1.03823E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 342.25 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.60e-42 with 57 degrees of freedom
Photon flux (15-150 keV) in 1070 sec: 0.502944 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01043e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -193.768 sec. to 876.200 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.21142 ( -0.942479 0.75164 )
Epeak [keV] : 21.9547 ( -1.37957 1.30158 )
Norm@50keV : 9.05000 ( -9.44991 28.927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.41 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.49e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1070 sec: 0.389875 ( -0.021526 0.021814 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59548e-05 ( -7.13583e-07 7.19468e-07 ) ergs/cm2
Band function
Time interval is from -193.768 sec. to 876.200 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50881 ( )
beta : -7.52026 ( )
Epeak [keV] : 7.19763 ( )
Norm@50keV : 2.86422E-02 ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 1070 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] : 5.43313 (-0.121963 0.125204)
R^2/D10^2 : 2.45334 (-0.296819 0.337422)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.86 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.68e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.801e-06 4.596e-07
25- 50 7.016e-06 2.135e-07
50-150 4.200e-07 4.815e-08
15-150 1.624e-05 5.082e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.2839 ( )
Norm : 9.81540 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 127.23 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.81e-07 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.088e-05 6.859e-07
25- 50 6.592e-06 2.520e-07
50-150 9.062e-07 8.448e-08
15-150 1.838e-05 8.935e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.41781 (-0.121963 0.125204)
R1^2/D10^2 : 2.48693 (-0.296819 0.337422)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 1.06342E-06 (-1.06342e-06 -1.06342e-06)
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.85 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.34e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from -168.628 sec. to -167.628 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.93765 ( -0.385618 0.454841 )
Norm@50keV : 3.90312E-03 ( -0.00138171 0.00148762 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.25 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.90e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.02618 ( -0.179313 0.179668 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56007e-08 ( -9.97505e-09 1.07009e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -168.628 sec. to -167.628 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.97517 ( 1.78709 3.01243 )
Epeak [keV] : 21.8866 ( -2.4846 3.91079 )
Norm@50keV : 98.7521 ( -103.976 1.69657e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.74 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.60e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.00716 ( -0.171452 0.1719 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.77766e-08 ( -7.0685e-09 7.6067e-09 ) ergs/cm2
Band function
Time interval is from -168.628 sec. to -167.628 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.96350 ( 0.822496 2.9635 )
beta : -2.93759 ( -0.455053 0.385621 )
Epeak [keV] : 52.5347 ( -52.5347 -52.5347 )
Norm@50keV : 0.530517 ( -0.187793 0.202189 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 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] : 5.37628 (-0.753269 0.849616)
R^2/D10^2 : 6.54540 (-3.19094 6.48682)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.96 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.76e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.110e-08 7.287e-09
25- 50 1.641e-08 5.873e-09
50-150 9.368e-10 6.878e-10
15-150 3.844e-08 1.104e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.4972 (-4.90212 7.32146)
Norm : 14.9771 (-5.25474 8.04355)
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.89 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.00e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.055e-08 5.375e-09
25- 50 1.614e-08 5.595e-09
50-150 3.823e-09 2.828e-09
15-150 4.051e-08 1.030e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.27765 (-0.761924 0.84184)
R1^2/D10^2 : 7.02595 (-3.19104 6.49066)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 4.13186E-05 (-4.13186e-05 -4.13186e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared 43.35 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.72e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.107e-08 2.911e-06
25- 50 1.646e-08 2.847e-06
50-150 9.481e-10 3.046e-07
15-150 3.848e-08 5.445e-06
Plot creation:
Sun Oct 18 22:07:31 EDT 2020