batgrbproduct analysis for trigger=1000255
batgrbproduct Analysis for Trigger=1000255
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): Thu Oct 15 11:05:01 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger1000255/batgroup_hand_proc
======================================================================
Trigger: 01000255 Segment: 000
BAT Trigger Time: 624408544 [s; MET]
Trigger Stop: 624408608 [s; MET]
UTC: 2020-10-14T22:48:38.193780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 20.8466176995543 Dec: 27.6923730288515 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.38
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.38
Flight Position: [ source = BAT ]
RA: 20.8466176995543 Dec: 27.6923730288515 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 20.8340824780018 Dec: 27.7219777586787 [deg; J2000]
{ 01h 23m 20.2s , +27d 43' 19.1" }
+/- 2.50775373547916 [arcmin] (estimated 90% radius based on SNR)
+/- 1.20217676059562 [arcmin] (formal 1-sigma fit error)
SNR: 8.17921077613717
Angular difference between Flight and Ground position is 1.896990 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 36.1959998607635 +/- 8.10761416466268
Measured from: 31.6720000505447
to: 67.8679999113083 [s; relative to TRIGTIME]
T50: 14.2919999361038 +/- 7.68920408764752
Measured from: 39
to: 53.2919999361038 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 59.4400000572205
to: 60.4400000572205 [s; relative to TRIGTIME]
Total Fluence
Measured from: 30.1640000343323
to: 69.8400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.382498 0.261239 0.036463 0.025609
0.042583 0.043640 0.037681 0.032962 [error]
Peak 0.020656 0.009621 0.006157 0.009307
0.006916 0.006660 0.005859 0.005260 [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 1.05e-07 1.02e-07 7.00e-08 7.51e-08 3.07e-07 3.52e-07 erg/cm2
Error 1.93e-08 2.09e-08 2.85e-08 5.65e-08 6.83e-08 1.02e-07 erg/cm2
Peak flux Power-law 1.58e-01 1.06e-01 4.65e-02 2.81e-02 3.25e-01 3.39e-01 ph/cm2/s
Error 1.31e-01 7.96e-02 4.74e-02 7.22e-02 1.54e-01 1.68e-01 ph/cm2/s
Fluence Cutoff-PL 1.05e-07 1.15e-07 3.55e-08 1.94e-09 2.58e-07 2.58e-07 erg/cm2
Error 2.07e-08 2.72e-08 4.25e-08 3.15e-08 6.95e-08 9.76e-08 erg/cm2
Peak flux Cutoff-PL 1.60e-01 1.05e-01 4.50e-02 2.61e-02 3.24e-01 3.37e-01 ph/cm2/s
Error 9.88e-02 6.16e-02 5.01e-02 7.80e-02 1.53e-01 1.27e-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 2.550 0.370 - - 7.64e-04 2.31e-04 0.000 0
CPL 0.695 2.660 21.2 13.4 1.50e-02 3.58e+00 0.000 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.190 1.446 - - 1.97e-03 1.72e-03 0.000 0
CPL 2.007 0.000 3.8 0.0 2.03e-03 0.00e+00 0.000 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 39.676 30.164 69.840
T90 36.196 31.672 67.868
T50 14.292 39.000 53.292
Peak 1.000 59.440 60.440
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
20.8341 +27.7220 0.0235 14.7 -14.8 0.6959 8.2 TRIG_01000255
------------------------------------------
Foreground time interval of the image:
30.164 69.840 (delta_t = 39.676 [sec])
Background time interval of the image:
-143.699 30.164 (delta_t = 173.863 [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 30.164 sec. to 69.840 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.54978 ( -0.34254 0.396762 )
Norm@50keV : 7.63712E-04 ( -0.000228845 0.000233975 )
------------------------------------------------------------
Photon flux (15-150 keV) in 39.68 sec: 0.154723 ( -0.0253007 0.0253573 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07264e-07 ( -6.57756e-08 7.08248e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 30.164 sec. to 69.840 sec.
XSPEC: quit
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.694808 ( -3.59567 1.72341 )
Epeak [keV] : 21.1655 ( -19.0159 7.71566 )
Norm@50keV : 1.49558E-02 ( -0.0157137 7.13625 )
------------------------------------------------------------
Photon flux (15-150 keV) in 39.68 sec: 0.149648 ( -0.024552 0.025089 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58203e-07 ( -5.6067e-08 8.28927e-08 ) ergs/cm2
Band function
Time interval is from 30.164 sec. to 69.840 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.72775 ( -4.70468 -2.72812 )
beta : -3.16684 ( -2.75568 0.718915 )
Epeak [keV] : 22.1164 ( -6.32454 4.43764 )
Norm@50keV : 7.78978 ( -7.80728 199.662 )
------------------------------------------------------------
Photon flux (15-150 keV) in 39.68 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC12>exit
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.27026 (-1.00516 1.18891)
R^2/D10^2 : 0.476653 (-0.247102 0.527312)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.050e-07 3.026e-08
25- 50 1.151e-07 3.478e-08
50-150 1.258e-08 7.750e-09
15-150 2.326e-07 6.204e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>/*
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.3842 (-8.30929 13.7534)
Norm : 1.40656 (-0.430625 0.688327)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.057e-07 2.307e-08
25- 50 1.121e-07 3.123e-08
50-150 5.152e-08 3.473e-08
15-150 2.694e-07 6.585e-08
Double BB
XSPEC12>/*
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.09373 (-5.14625 1.85804)
R1^2/D10^2 : 0.927139 (-0.896671 -0.896671)
kT2 [keV] : 13.5500 (-14.1101 -14.1101)
R2^2/D10^2 : 7.81141E-03 (-0.00644203 0.624679)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.084e-07 6.029e-08
25- 50 1.092e-07 5.859e-08
50-150 5.445e-08 3.972e-08
15-150 2.720e-07 1.399e-07
Peak spectrum fit
Power-law model
Time interval is from 59.440 sec. to 60.440 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19005 ( -1.11809 1.77313 )
Norm@50keV : 1.97185E-03 ( -0.00197067 0.00147387 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 0.324731 ( -0.154205 0.154039 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85055e-08 ( -1.13371e-08 1.37797e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 59.440 sec. to 60.440 sec.
XSPEC: quit
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00665 ( -2.00665 -2.00665 )
Epeak [keV] : 3.78599 ( )
Norm@50keV : 2.02863E-03 ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 0.323926 ( -0.152888 0.152656 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81261e-08 ( -1.09779e-08 1.35899e-08 ) ergs/cm2
Band function
Time interval is from 59.440 sec. to 60.440 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.69361 ( 1.69365 1.69365 )
beta : -2.19031 ( 2.19096 1.11783 )
Epeak [keV] : 4.99347 ( -4.99888 -4.99888 )
Norm@50keV : 8.00376E-03 ( -0.00800499 1.30103e+06 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC12>exit
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.51328 (-3.27602 6.66419)
R^2/D10^2 : 0.779974 (-0.775798 17.3111)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.902e-09 3.109e-09
25- 50 5.814e-09 3.931e-09
50-150 7.369e-10 7.435e-10
15-150 1.145e-08 8.260e-09
Thermal bremsstrahlung (OTTB)
XSPEC12>/*
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 41.5936 (-41.9919 -41.9919)
Norm : 1.99408 (-1.27063 7.38263)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.638e-09 3.129e-09
25- 50 6.204e-09 4.056e-09
50-150 5.006e-09 4.616e-09
15-150 1.585e-08 1.119e-08
Double BB
XSPEC12>/*
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.61945 (-4.38969 4.46032)
R1^2/D10^2 : 1.34610 (-1.37384 91.3637)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 5.64889E-05 (-2.82457e-05 0.000465737)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.216e-09 3.308e-09
25- 50 4.929e-09 3.158e-09
50-150 1.542e-08 1.035e-08
15-150 2.556e-08 1.066e-08
Plot creation:
Thu Oct 15 11:12:15 EDT 2020