batgrbproduct analysis for trigger=851855
batgrbproduct Analysis for Trigger=851855
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 Aug 6 20:03:22 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger851855/GCN5_download_cron
======================================================================
Trigger: 00851855 Segment: 000
BAT Trigger Time: 555166977.856 [s; MET]
Trigger Stop: 555166978.112 [s; MET]
UTC: 2018-08-05T13:02:36.477100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 25.8134664618429 Dec: -17.5033792589829 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.44
Image Trigger?: NO
Rate S/N Ratio: 27.9821371592664 [ if not an image trigger ]
Image S/N Ratio: 10.44
Flight Position: [ source = BAT ]
RA: 25.8134664618429 Dec: -17.5033792589829 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 25.8774171808023 Dec: -17.4748061029982 [deg; J2000]
{ 01h 43m 30.6s , -17d 28' 29.3" }
+/- 3.09656900070101 [arcmin] (estimated 90% radius based on SNR)
+/- 1.65094436834717 [arcmin] (formal 1-sigma fit error)
SNR: 6.05145974726132
Angular difference between Flight and Ground position is 4.041328 arcmin
Partial Coding Fraction: 0.671875 [ including projection effects ]
Duration
T90: 122.511999964714 +/- 18.2728064531038
Measured from: 0.108000159263611
to: 122.620000123978 [s; relative to TRIGTIME]
T50: 68.3960000276566 +/- 30.0895291608301
Measured from: 28.9520001411438
to: 97.3480001688004 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.107999920845032
to: 0.892000079154968 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0999999046325684
to: 127.464000105858 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.321439 0.414372 0.426321 0.296569
0.070775 0.073884 0.065648 0.059880 [error]
Peak 0.033395 0.057203 0.094262 0.029373
0.007916 0.009191 0.008764 0.007442 [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 8.32e-08 1.92e-07 3.53e-07 1.55e-06 9.59e-07 2.17e-06 erg/cm2
Error 2.69e-08 3.67e-08 6.41e-08 6.65e-07 1.65e-07 6.96e-07 erg/cm2
Peak flux Power-law 3.05e-01 4.70e-01 5.44e-01 1.21e+00 1.68e+00 2.53e+00 ph/cm2/s
Error 8.24e-02 7.89e-02 6.75e-02 3.19e-01 2.13e-01 3.49e-01 ph/cm2/s
Fluence Cutoff-PL 8.35e-08 1.93e-07 3.53e-07 1.52e-06 9.58e-07 2.15e-06 erg/cm2
Error 2.12e-08 2.83e-08 6.38e-08 5.50e-07 1.67e-07 8.53e-07 erg/cm2
Peak flux Cutoff-PL 1.85e-01 4.72e-01 6.40e-01 4.44e-01 1.58e+00 1.74e+00 ph/cm2/s
Error 1.05e-01 9.69e-02 9.71e-02 3.16e-01 2.28e-01 3.95e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.85e-01 4.72e-01 6.40e-01 4.45e-01 1.58e+00 1.74e+00 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 1.126 0.290 - - 7.25e-04 1.14e-04 54.180 57
CPL 1.121 1.469 10000.0 0.0 7.28e-04 -3.07e-04 54.180 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.790 0.209 - - 1.46e-02 1.89e-03 57.790 57
CPL -0.725 1.341 112.0 75.6 5.87e-02 9.70e-02 51.730 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: 123.392000 sec.
T50 in the 50-300 keV band: 84.480000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 127.564 -0.100 127.464
T90 122.512 0.108 122.620
T50 68.396 28.952 97.348
Peak 1.000 -0.108 0.892
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
25.8774 -17.4748 0.0318 28.8 -42.2 0.3236 6.1 TRIG_00851855
------------------------------------------
Foreground time interval of the image:
-0.100 14.145 (delta_t = 14.245 [sec])
Background time interval of the image:
-239.856 -0.100 (delta_t = 239.756 [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 -0.100 sec. to 127.464 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12573 ( -0.29799 0.282779 )
Norm@50keV : 7.24643E-04 ( -0.000114608 0.000114307 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.18 using 59 PHA bins.
# Reduced chi-squared = 0.9505 for 57 degrees of freedom
# Null hypothesis probability = 5.816222e-01
Photon flux (15-150 keV) in 127.6 sec: 8.42757E-02 ( -0.0138159 0.0138913 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.58943e-07 ( -1.6411e-07 1.65766e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.100 sec. to 127.464 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12109 ( -0.946873 1.9909 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 7.28425E-04 ( -0.000114384 -0.000728446 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.18 using 59 PHA bins.
# Reduced chi-squared = 0.9676 for 56 degrees of freedom
# Null hypothesis probability = 5.439432e-01
Photon flux (15-150 keV) in 127.6 sec: 8.44014E-02 ( -0.0139957 0.0136339 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.58294e-07 ( -1.68172e-07 1.65035e-07 ) ergs/cm2
Band function
Time interval is from -0.100 sec. to 127.464 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.75481 ( -4.75481 -4.75481 )
beta : -1.20033 ( -0.365977 0.327162 )
Epeak [keV] : 26.6211 ( -26.6211 11.0495 )
Norm@50keV : 25.8579 ( -4.04456 214748 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.55 using 59 PHA bins.
# Reduced chi-squared = 0.9736 for 55 degrees of freedom
# Null hypothesis probability = 5.302338e-01
Photon flux (15-150 keV) in 127.6 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] : 20.0223 (-4.19218 6.03744)
R^2/D10^2 : 3.82439E-03 (-0.00217136 0.00448734)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.38 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.340540e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.770e-08 1.393e-08
25- 50 1.879e-07 5.599e-08
50-150 5.585e-07 1.889e-07
15-150 7.842e-07 2.031e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-50.2392 -200)
Norm : 0.350637 (-0.0567076 0.0567076)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.59 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.477700e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.115e-07 6.338e-08
25- 50 2.144e-07 1.208e-07
50-150 4.703e-07 2.655e-07
15-150 7.962e-07 4.420e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.23720 (-4.17103 6.35375)
R1^2/D10^2 : 4.52679E-02 (-0.0303045 0.290865)
kT2 [keV] : 40.3852 (-23.546 -46.6315)
R2^2/D10^2 : 3.62204E-04 (-0.000223477 0.00193362)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.30 using 59 PHA bins.
# Reduced chi-squared = 0.9872 for 55 degrees of freedom
# Null hypothesis probability = 5.014043e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.202e-08 4.988e-08
25- 50 1.992e-07 1.101e-07
50-150 6.775e-07 3.845e-07
15-150 9.587e-07 5.099e-07
Peak spectrum fit
Power-law model
Time interval is from -0.108 sec. to 0.892 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.789962 ( -0.214694 0.20324 )
Norm@50keV : 1.45822E-02 ( -0.00190243 0.00187823 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.79 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.457397e-01
Photon flux (15-150 keV) in 1 sec: 1.67661 ( -0.212055 0.212948 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71129e-07 ( -2.18372e-08 2.19307e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.108 sec. to 0.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.724775 ( -1.57718 1.10418 )
Epeak [keV] : 112.042 ( -26.7004 124.588 )
Norm@50keV : 5.87074E-02 ( -0.0367659 0.157312 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.73 using 59 PHA bins.
# Reduced chi-squared = 0.9237 for 56 degrees of freedom
# Null hypothesis probability = 6.372030e-01
Photon flux (15-150 keV) in 1 sec: 1.57837 ( -0.2283 0.22682 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62756e-07 ( -2.3831e-08 2.3559e-08 ) ergs/cm2
Band function
Time interval is from -0.108 sec. to 0.892 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.721998 ( -1.09183 1.11752 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 112.155 ( -18.5666 91.5159 )
Norm@50keV : 5.85501E-02 ( -0.0361072 0.524243 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.73 using 59 PHA bins.
# Reduced chi-squared = 0.9405 for 55 degrees of freedom
# Null hypothesis probability = 6.004311e-01
Photon flux (15-150 keV) in 1 sec: 1.57857 ( ) 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] : 25.0657 (-3.42084 4.39614)
R^2/D10^2 : 4.37572E-02 (-0.0169243 0.0251205)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.12 using 59 PHA bins.
# Reduced chi-squared = 0.9144 for 57 degrees of freedom
# Null hypothesis probability = 6.582201e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.769e-09 1.289e-09
25- 50 2.709e-08 5.425e-09
50-150 1.262e-07 2.605e-08
15-150 1.580e-07 2.645e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-21.4696 -200)
Norm : 6.60764 (-0.888537 0.888537)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 93.02 using 59 PHA bins.
# Reduced chi-squared = 1.632 for 57 degrees of freedom
# Null hypothesis probability = 1.828440e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.646e-08 9.370e-09
25- 50 3.166e-08 1.772e-08
50-150 6.943e-08 3.874e-08
15-150 1.175e-07 6.525e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.35275 (-3.40543 -3.40543)
R1^2/D10^2 : 8.22366 (-8.44401 376.179)
kT2 [keV] : 26.1208 (-3.84109 -26.097)
R2^2/D10^2 : 3.80016E-02 (-0.03811 0.0242543)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.52 using 59 PHA bins.
# Reduced chi-squared = 0.9185 for 55 degrees of freedom
# Null hypothesis probability = 6.464181e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.368e-09 3.127e-09
25- 50 2.613e-08 6.765e-09
50-150 1.281e-07 3.165e-08
15-150 1.616e-07 3.635e-08
Plot creation:
Mon Aug 6 20:07:14 EDT 2018