batgrbproduct analysis for trigger=775553
batgrbproduct Analysis for Trigger=775553
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 v2.46
Process Start Time (local time): Mon Oct 2 15:35:56 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger775553/GCN5_download_cron
======================================================================
Trigger: 00775553 Segment: 000
BAT Trigger Time: 528575160 [s; MET]
Trigger Stop: 528575248 [s; MET]
UTC: 2017-10-01T18:25:40.226640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 22.0881651678874 Dec: -11.8933202859369 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.92
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.92
Flight Position: [ source = BAT ]
RA: 22.0881651678874 Dec: -11.8933202859369 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 22.079949844976 Dec: -11.9263358863315 [deg; J2000]
{ 01h 28m 19.2s , -11d 55' 34.8" }
+/- 2.167697761524 [arcmin] (estimated 90% radius based on SNR)
+/- 1.03436177899705 [arcmin] (formal 1-sigma fit error)
SNR: 10.0721038622019
Angular difference between Flight and Ground position is 2.038806 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 22.811999976635 +/- 2.03818052489851
Measured from: 12.5000001192093
to: 35.3120000958443 [s; relative to TRIGTIME]
T50: 14.6679999232292 +/- 2.32553904969789
Measured from: 17.3880001306534
to: 32.0560000538826 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 31.4160000085831
to: 32.4160000085831 [s; relative to TRIGTIME]
Total Fluence
Measured from: 11.3960000276566
to: 37.0199999809265 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.273672 0.354368 0.316519 0.092278
0.035297 0.037035 0.032574 0.028994 [error]
Peak 0.037009 0.039958 0.030424 0.004091
0.007295 0.007923 0.006915 0.005887 [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 8.37e-08 1.56e-07 2.25e-07 6.84e-07 6.39e-07 1.15e-06 erg/cm2
Error 1.50e-08 1.71e-08 3.23e-08 2.12e-07 7.79e-08 2.38e-07 erg/cm2
Peak flux Power-law 3.47e-01 3.08e-01 1.88e-01 1.73e-01 9.16e-01 1.02e+00 ph/cm2/s
Error 1.02e-01 6.06e-02 5.73e-02 1.04e-01 1.80e-01 2.09e-01 ph/cm2/s
Fluence Cutoff-PL 7.76e-08 1.63e-07 2.30e-07 3.52e-07 6.16e-07 8.23e-07 erg/cm2
Error 1.85e-08 2.16e-08 3.51e-08 3.61e-07 8.83e-08 3.85e-07 erg/cm2
Peak flux Cutoff-PL 3.32e-01 3.21e-01 1.90e-01 1.10e-01 9.04e-01 9.53e-01 ph/cm2/s
Error 1.15e-01 7.41e-02 6.16e-02 1.43e-01 1.84e-01 2.37e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.28e-01 3.22e-01 1.92e-01 1.08e-01 9.04e-01 9.50e-01 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 1.475 0.189 - - 2.62e-03 2.85e-04 60.560 57
CPL 1.024 0.750 107.6 -32.0 4.43e-03 5.32e-03 59.650 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.713 0.365 - - 6.86e-03 1.60e-03 44.640 57
CPL 1.367 1.267 83.0 0.0 1.06e-02 0.00e+00 44.410 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: 21.056000 sec.
T50 in the 50-300 keV band: 14.656000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 25.624 11.396 37.020
T90 22.812 12.500 35.312
T50 14.668 17.388 32.056
Peak 1.000 31.416 32.416
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
22.0799 -11.9263 0.0191 20.8 53.0 0.9981 10.1 TRIG_00775553
------------------------------------------
Foreground time interval of the image:
11.396 37.020 (delta_t = 25.624 [sec])
Background time interval of the image:
-13.499 11.396 (delta_t = 24.895 [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 11.396 sec. to 37.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47540 ( -0.187505 0.190096 )
Norm@50keV : 2.61734E-03 ( -0.000286429 0.000284246 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.56 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.487746e-01
Photon flux (15-150 keV) in 25.62 sec: 0.324634 ( -0.0345469 0.0345865 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.38771e-07 ( -7.73363e-08 7.83731e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.396 sec. to 37.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02387 ( -0.953721 0.545588 )
Epeak [keV] : 107.559 ( -43.5989 -107.559 )
Norm@50keV : 4.42947E-03 ( -0.00196723 0.00866672 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.65 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 56 degrees of freedom
# Null hypothesis probability = 3.444082e-01
Photon flux (15-150 keV) in 25.62 sec: 0.317526 ( -0.037089 0.036782 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.15526e-07 ( -8.78843e-08 8.86196e-08 ) ergs/cm2
Band function
Time interval is from 11.396 sec. to 37.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.951796 ( 0.951796 0.951796 )
beta : -1.90386 ( 1.90384 0.577157 )
Epeak [keV] : 96.9662 ( -96.9661 -96.9661 )
Norm@50keV : 4.86063E-03 ( -0.00194163 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.56 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 55 degrees of freedom
# Null hypothesis probability = 3.134317e-01
Photon flux (15-150 keV) in 25.62 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] : 15.0995 (-1.78962 2.10082)
R^2/D10^2 : 3.63229E-02 (-0.0133095 0.0202212)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.49 using 59 PHA bins.
# Reduced chi-squared = 1.272 for 57 degrees of freedom
# Null hypothesis probability = 8.104762e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.437e-08 8.839e-09
25- 50 1.774e-07 2.711e-08
50-150 2.760e-07 6.155e-08
15-150 4.978e-07 7.801e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-66.4433 -200)
Norm : 1.32912 (-0.139239 0.139239)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.29 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 57 degrees of freedom
# Null hypothesis probability = 3.578355e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.480e-08 4.705e-08
25- 50 1.631e-07 8.964e-08
50-150 3.578e-07 1.942e-07
15-150 6.057e-07 3.328e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.77086 (-1.22841 2.14549)
R1^2/D10^2 : 16.6712 (-15.7907 1408.03)
kT2 [keV] : 17.4051 (-2.45054 3.42605)
R2^2/D10^2 : 2.08270E-02 (-0.0100263 0.0148161)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.43 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 55 degrees of freedom
# Null hypothesis probability = 3.851197e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.061e-08 3.299e-08
25- 50 1.526e-07 3.428e-08
50-150 3.211e-07 7.230e-08
15-150 5.544e-07 1.123e-07
Peak spectrum fit
Power-law model
Time interval is from 31.416 sec. to 32.416 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71347 ( -0.349563 0.379495 )
Norm@50keV : 6.86147E-03 ( -0.00162894 0.00156239 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.64 using 59 PHA bins.
# Reduced chi-squared = 0.7831 for 57 degrees of freedom
# Null hypothesis probability = 8.830058e-01
Photon flux (15-150 keV) in 1 sec: 0.915609 ( -0.180084 0.180088 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.34642e-08 ( -1.52922e-08 1.58925e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.416 sec. to 32.416 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36732 ( -1.5116 1.02263 )
Epeak [keV] : 82.9973 ( -82.9973 -82.9973 )
Norm@50keV : 1.06341E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.41 using 59 PHA bins.
# Reduced chi-squared = 0.7930 for 56 degrees of freedom
# Null hypothesis probability = 8.680474e-01
Photon flux (15-150 keV) in 1 sec: 0.904496 ( -0.183901 0.183814 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.15026e-08 ( -1.64034e-08 1.71734e-08 ) ergs/cm2
Band function
Time interval is from 31.416 sec. to 32.416 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39365 ( -0.605935 1.37984 )
beta : -9.36876 ( 9.37148 19.3715 )
Epeak [keV] : 91.4471 ( -55.8429 -91.2217 )
Norm@50keV : 1.01138E-02 ( -0.00456966 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.42 using 59 PHA bins.
# Reduced chi-squared = 0.8076 for 55 degrees of freedom
# Null hypothesis probability = 8.454828e-01
Photon flux (15-150 keV) in 1 sec: 0.904324 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1269e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.4426 (-3.28337 4.34075)
R^2/D10^2 : 0.193809 (-0.126185 0.390318)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.84 using 59 PHA bins.
# Reduced chi-squared = 0.9094 for 57 degrees of freedom
# Null hypothesis probability = 6.686196e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.360e-09 2.800e-09
25- 50 2.087e-08 8.581e-09
50-150 1.989e-08 1.020e-08
15-150 4.712e-08 1.677e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 126.979 (-68.1807 -124.958)
Norm : 3.85073 (-0.836392 1.23722)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.45 using 59 PHA bins.
# Reduced chi-squared = 0.7798 for 57 degrees of freedom
# Null hypothesis probability = 8.870955e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.000e-08 5.730e-09
25- 50 1.807e-08 1.018e-08
50-150 3.314e-08 2.195e-08
15-150 6.121e-08 3.799e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.97100 (-2.17312 3.01661)
R1^2/D10^2 : 3.66379 (-3.0392 49.4339)
kT2 [keV] : 20.2345 (-6.31097 13.8434)
R2^2/D10^2 : 2.80140E-02 (-0.0237776 0.0838163)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.12 using 59 PHA bins.
# Reduced chi-squared = 0.7839 for 55 degrees of freedom
# Null hypothesis probability = 8.773919e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.091e-08 6.380e-09
25- 50 1.665e-08 8.770e-09
50-150 3.380e-08 2.043e-08
15-150 6.136e-08 3.351e-08
Plot creation:
Mon Oct 2 15:48:22 EDT 2017