batgrbproduct analysis for trigger=1001628
batgrbproduct Analysis for Trigger=1001628
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 25 20:17:20 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger1001628/GCN5_download_cron
======================================================================
Trigger: 01001628 Segment: 000
BAT Trigger Time: 625249040 [s; MET]
Trigger Stop: 625249104 [s; MET]
UTC: 2020-10-24T16:16:54.138380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.863807361974 Dec: -15.8219221419744 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.75
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.75
Flight Position: [ source = BAT ]
RA: 244.863807361974 Dec: -15.8219221419744 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.824368171562 Dec: -15.6328530421485 [deg; J2000]
{ 16h 19m 17.8s , -15d 37' 58.3" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 395.756458327335 [arcmin] (formal 1-sigma fit error)
SNR: -0.0248131863636154
Angular difference between Flight and Ground position is 11.570559 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 17.3719999790192 +/- 1.56101633396437
Measured from: 634.028000116348
to: 651.400000095367 [s; relative to TRIGTIME]
T50: 10.6679999828339 +/- 5.45858029419925
Measured from: 636.5640001297
to: 647.232000112534 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 634.332000017166
to: 635.332000017166 [s; relative to TRIGTIME]
Total Fluence
Measured from: 632.651999950409
to: 651.611999988556 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.594890 0.003631 -0.056719 -0.050071
0.045511 0.040693 0.034116 0.029230 [error]
Peak 0.062438 0.016910 -0.007246 -0.007508
0.010545 0.009163 0.007865 0.006901 [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 1.75e-07 2.33e-08 1.38e-09 8.60e-11 1.99e-07 1.99e-07 erg/cm2
Error 2.97e-08 1.26e-08 1.96e-09 2.26e-10 3.82e-08 3.83e-08 erg/cm2
Peak flux Power-law 6.07e-01 1.42e-01 1.71e-02 2.30e-03 7.68e-01 7.68e-01 ph/cm2/s
Error 1.73e-01 8.16e-02 2.35e-02 6.09e-03 2.27e-01 2.28e-01 ph/cm2/s
Fluence Cutoff-PL 1.89e-07 8.24e-09 2.35e-13 6.54e-24 1.97e-07 1.97e-07 erg/cm2
Error 3.37e-08 1.47e-08 9.99e-10 0.00e+00 3.42e-08 3.42e-08 erg/cm2
Peak flux Cutoff-PL 6.27e-01 1.46e-01 3.38e-03 2.65e-06 7.77e-01 7.76e-01 ph/cm2/s
Error 1.85e-01 1.01e-01 1.99e-02 1.68e-03 2.21e-01 2.18e-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 6.081 0.909 - - 7.87e-05 9.38e-05 47.000 0
CPL -4.409 0.000 11.4 0.0 1.01e+05 0.00e+00 44.590 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.053 1.083 - - 1.19e-03 1.33e-03 67.220 0
CPL 0.167 0.000 11.5 0.0 1.16e+00 0.00e+00 66.270 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 18.960 632.652 651.612
T90 17.372 634.028 651.400
T50 10.668 636.564 647.232
Peak 1.000 634.332 635.332
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.8244 -15.6329 7.6877 23.9 -59.0 -0.0019 -0.0 TRIG_01001628
------------------------------------------
Foreground time interval of the image:
632.652 651.612 (delta_t = 18.960 [sec])
Background time interval of the image:
-146.899 632.652 (delta_t = 779.551 [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 632.652 sec. to 651.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.08095 ( -0.835976 0.982644 )
Norm@50keV : 7.87194E-05 ( -7.86784e-05 0.000108951 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.00 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.25e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 18.96 sec: 0.351404 ( -0.0614413 0.0615468 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99315e-07 ( -3.77632e-08 3.87341e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 632.652 sec. to 651.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.40854 ( )
Epeak [keV] : 11.4444 ( )
Norm@50keV : 1.00672E+05 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.59 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.64e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 18.96 sec: 0.362017 ( -0.059954 0.060748 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97442e-07 ( -3.40279e-08 3.44333e-08 ) ergs/cm2
Band function
Time interval is from 632.652 sec. to 651.612 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.62283 ( 4.21112 6.62283 )
beta : -6.21865 ( -0.871477 0.964432 )
Epeak [keV] : 805.444 ( -805.444 -805.444 )
Norm@50keV : 9.18901E-03 ( -0.00598188 0.016133 )
------------------------------------------------------------
Photon flux (15-150 keV) in 18.96 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] : 2.33664 (-0.343276 0.40759)
R^2/D10^2 : 298.903 (-298.901 761.738)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.65 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.83e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.875e-07 1.031e-07
25- 50 1.041e-08 6.415e-09
50-150 1.656e-12 1.939e-12
15-150 1.979e-07 1.071e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.12323 (-0.884598 1.18857)
Norm : 176.798 (-110.392 355.365)
------------------------------------------------------------
#Fit statistic : Chi-Squared 45.01 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.75e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.839e-07 1.012e-07
25- 50 1.452e-08 8.805e-09
50-150 2.582e-11 2.989e-11
15-150 1.984e-07 1.090e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.30249 (-2.30434 -2.30434)
R1^2/D10^2 : 174.682 (-176.794 1.05375e+11)
kT2 [keV] : 2.38412 (-2.36875 -2.36875)
R2^2/D10^2 : 122.682 (-123.576 -123.576)
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.65 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.39e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.875e-07 2.349e+01
25- 50 1.052e-08 2.107e+02
50-150 1.757e-12 5.489e+03
15-150 1.980e-07 5.665e+03
Peak spectrum fit
Power-law model
Time interval is from 634.332 sec. to 635.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.05279 ( -0.872009 1.2942 )
Norm@50keV : 1.18835E-03 ( -0.00118876 0.00147931 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.22 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.67e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.767501 ( -0.226109 0.228319 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72106e-08 ( -9.39139e-09 1.06423e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 634.332 sec. to 635.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.166591 ( )
Epeak [keV] : 11.4788 ( )
Norm@50keV : 1.16265 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 66.27 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.64e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.776523 ( -0.219908 0.221772 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62609e-08 ( -8.2758e-09 9.5904e-09 ) ergs/cm2
Band function
Time interval is from 634.332 sec. to 635.332 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.42243 ( -6.45905 1.63558 )
beta : -9.37167 ( 9.37167 19.3699 )
Epeak [keV] : 5.53745 ( -4.14575 12.8981 )
Norm@50keV : 0.118342 ( -0.12731 22.3907 )
------------------------------------------------------------
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] : 3.88436 (-1.04871 1.34251)
R^2/D10^2 : 24.1720 (-24.1721 119.812)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 66.48 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.83e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.904e-08 1.138e-08
25- 50 6.317e-09 4.137e-09
50-150 6.415e-11 6.755e-11
15-150 2.542e-08 1.473e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.40370 (-3.88507 6.82332)
Norm : 30.9465 (-18.961 83.3282)
------------------------------------------------------------
#Fit statistic : Chi-Squared 66.27 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.87e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.862e-08 1.096e-08
25- 50 7.366e-09 4.732e-09
50-150 4.255e-10 4.748e-10
15-150 2.641e-08 1.615e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.328595 (-3.0938 -3.0938)
R1^2/D10^2 : 4.26097E+16 (-4.89675e+16 2.26267e+21)
kT2 [keV] : 4.29471 (-1.24522 1.60755)
R2^2/D10^2 : 13.3942 (-10.6896 77.7972)
------------------------------------------------------------
#Fit statistic : Chi-Squared 65.34 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.60e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.876e-08 2.618e-08
25- 50 7.181e-09 1.422e-08
50-150 2.863e-10 9.675e-10
15-150 2.623e-08 1.798e-08
Plot creation:
Sun Oct 25 20:20:28 EDT 2020