batgrbproduct analysis for trigger=851829
batgrbproduct Analysis for Trigger=851829
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 05:55:27 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger851829/GCN5_download_cron
======================================================================
Trigger: 00851829 Segment: 000
BAT Trigger Time: 555152710.4 [s; MET]
Trigger Stop: 555152711.424 [s; MET]
UTC: 2018-08-05T09:04:49.021980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 167.530004406896 Dec: -45.3308970672546 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.46
Image Trigger?: NO
Rate S/N Ratio: 11.8321595661992 [ if not an image trigger ]
Image S/N Ratio: 7.46
Flight Position: [ source = BAT ]
RA: 167.530004406896 Dec: -45.3308970672546 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 167.575306578618 Dec: -45.3266052363395 [deg; J2000]
{ 11h 10m 18.1s , -45d 19' 35.8" }
+/- 2.14088147816208 [arcmin] (estimated 90% radius based on SNR)
+/- 0.943547378722526 [arcmin] (formal 1-sigma fit error)
SNR: 10.2528168998002
Angular difference between Flight and Ground position is 1.928221 arcmin
Partial Coding Fraction: 0.640625 [ including projection effects ]
Duration
T90: 1.67599987983704 +/- 0.408803074835252
Measured from: 0.116000175476074
to: 1.79200005531311 [s; relative to TRIGTIME]
T50: 0.863999962806702 +/- 0.378227475672485
Measured from: 0.340000152587891
to: 1.20400011539459 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.128000020980835
to: 1.12800002098083 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0360000133514404
to: 1.89999997615814 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.071357 0.069467 0.047084 0.032696
0.011993 0.012731 0.011461 0.011116 [error]
Peak 0.045116 0.053231 0.028972 0.016089
0.008975 0.009910 0.008758 0.008174 [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 1.65e-08 2.90e-08 3.88e-08 1.07e-07 1.13e-07 1.91e-07 erg/cm2
Error 4.65e-09 5.52e-09 1.06e-08 5.95e-08 2.56e-08 6.98e-08 erg/cm2
Peak flux Power-law 3.89e-01 3.67e-01 2.40e-01 2.44e-01 1.10e+00 1.24e+00 ph/cm2/s
Error 1.15e-01 7.50e-02 6.86e-02 1.34e-01 2.23e-01 2.64e-01 ph/cm2/s
Fluence Cutoff-PL 1.48e-08 3.44e-08 3.61e-08 1.37e-08 9.57e-08 9.90e-08 erg/cm2
Error 5.25e-09 8.35e-09 1.45e-08 5.69e-08 2.86e-08 6.90e-08 erg/cm2
Peak flux Cutoff-PL 3.24e-01 4.70e-01 2.14e-01 1.97e-02 1.03e+00 1.03e+00 ph/cm2/s
Error 1.37e-01 1.21e-01 9.71e-02 8.67e-02 2.26e-01 2.09e-01 ph/cm2/s
Fluence Band 1.60e-08 3.39e-08 3.53e-08 6.73e-08 1.07e-07 1.53e-07 erg/cm2
Error -------- 7.82e-09 -------- -------- -------- -------- 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 1.577 0.317 - - 6.46e-03 1.34e-03 56.430 57
CPL 0.160 1.904 54.0 -19.6 4.27e-02 5.02e-01 53.880 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.611 0.334 - - 8.50e-03 1.92e-03 49.940 57
CPL -0.620 2.574 47.2 36.0 1.74e-01 6.09e+00 46.190 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.864 0.036 1.900
T90 1.676 0.116 1.792
T50 0.864 0.340 1.204
Peak 1.000 0.128 1.128
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
167.5753 -45.3266 0.0187 21.6 102.4 0.2538 10.3 TRIG_00851829
------------------------------------------
Foreground time interval of the image:
0.036 1.900 (delta_t = 1.864 [sec])
Background time interval of the image:
-239.400 -182.480 (delta_t = 56.920 [sec])
-181.400 0.036 (delta_t = 181.436 [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 0.036 sec. to 1.900 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57679 ( -0.312845 0.321823 )
Norm@50keV : 6.45953E-03 ( -0.00135534 0.00133021 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.43 using 59 PHA bins.
# Reduced chi-squared = 0.9900 for 57 degrees of freedom
# Null hypothesis probability = 4.964748e-01
Photon flux (15-150 keV) in 1.864 sec: 0.824228 ( -0.15652 0.156561 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12929e-07 ( -2.51448e-08 2.60679e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.036 sec. to 1.900 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.160382 ( -2.31595 1.49224 )
Epeak [keV] : 54.0041 ( -14.8572 -54.0009 )
Norm@50keV : 4.26633E-02 ( -0.0426781 0.961338 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.88 using 59 PHA bins.
# Reduced chi-squared = 0.9621 for 56 degrees of freedom
# Null hypothesis probability = 5.555854e-01
Photon flux (15-150 keV) in 1.864 sec: 0.784399 ( -0.160133 0.162024 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.57492e-08 ( -2.58759e-08 3.1368e-08 ) ergs/cm2
Band function
Time interval is from 0.036 sec. to 1.900 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -6.04457 -5 )
beta : -1.93970 ( -0.682401 0.436885 )
Epeak [keV] : 27.9861 ( -6.83215 6.75553 )
Norm@50keV : 412.996 ( -76.1722 1858.74 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.96 using 59 PHA bins.
# Reduced chi-squared = 0.9447 for 55 degrees of freedom
# Null hypothesis probability = 5.915927e-01
Photon flux (15-150 keV) in 1.864 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06847e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.7754 (-2.22208 2.92833)
R^2/D10^2 : 0.226254 (-0.12594 0.258841)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.63 using 59 PHA bins.
# Reduced chi-squared = 0.9760 for 57 degrees of freedom
# Null hypothesis probability = 5.265798e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.235e-08 4.649e-09
25- 50 3.799e-08 1.185e-08
50-150 3.127e-08 1.372e-08
15-150 8.161e-08 2.545e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 144.399 (-76.8929 -144.579)
Norm : 3.46620 (-0.695738 0.904927)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.20 using 59 PHA bins.
# Reduced chi-squared = 0.9685 for 57 degrees of freedom
# Null hypothesis probability = 5.427463e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.665e-08 9.222e-09
25- 50 3.068e-08 1.734e-08
50-150 5.960e-08 3.703e-08
15-150 1.069e-07 6.215e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.11289 (-9.16208 3.99322)
R1^2/D10^2 : 0.453074 (-0.443018 -0.443018)
kT2 [keV] : 32.1966 (-34.3991 -34.3991)
R2^2/D10^2 : 3.25055E-03 (-0.00219186 0.262305)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.03 using 59 PHA bins.
# Reduced chi-squared = 0.9643 for 55 degrees of freedom
# Null hypothesis probability = 5.500864e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.468e-08 9.034e-09
25- 50 3.574e-08 2.091e-08
50-150 5.412e-08 2.588e-08
15-150 1.045e-07 5.496e-08
Peak spectrum fit
Power-law model
Time interval is from 0.128 sec. to 1.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61055 ( -0.326981 0.340806 )
Norm@50keV : 8.49604E-03 ( -0.00193857 0.00189786 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.94 using 59 PHA bins.
# Reduced chi-squared = 0.8762 for 57 degrees of freedom
# Null hypothesis probability = 7.346774e-01
Photon flux (15-150 keV) in 1 sec: 1.09538 ( -0.222638 0.222654 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.93571e-08 ( -1.89741e-08 1.97097e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.128 sec. to 1.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.619557 ( -3.12977 2.01725 )
Epeak [keV] : 47.2197 ( -9.99667 61.9095 )
Norm@50keV : 0.173925 ( -0.187065 11.986 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8249 for 56 degrees of freedom
# Null hypothesis probability = 8.220198e-01
Photon flux (15-150 keV) in 1 sec: 1.02570 ( -0.223875 0.22859 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.30312e-08 ( -1.65157e-08 2.28481e-08 ) ergs/cm2
Band function
Time interval is from 0.128 sec. to 1.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.643698 ( -2.63968 -0.836367 )
beta : -2.65724 ( 2.81868 1.22901 )
Epeak [keV] : 45.3911 ( -20.555 33.937 )
Norm@50keV : 0.189816 ( -0.280039 196.461 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.56 using 59 PHA bins.
# Reduced chi-squared = 0.8284 for 55 degrees of freedom
# Null hypothesis probability = 8.140239e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.8248e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.4791 (-2.05641 2.64379)
R^2/D10^2 : 0.339560 (-0.182341 0.358324)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.50 using 59 PHA bins.
# Reduced chi-squared = 0.8158 for 57 degrees of freedom
# Null hypothesis probability = 8.383211e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.417e-09 3.363e-09
25- 50 2.810e-08 9.655e-09
50-150 2.159e-08 1.022e-08
15-150 5.910e-08 1.963e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 133.187 (-70.5022 -131.1)
Norm : 4.63684 (-1.01104 1.39119)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.58 using 59 PHA bins.
# Reduced chi-squared = 0.8523 for 57 degrees of freedom
# Null hypothesis probability = 7.786249e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.201e-08 7.030e-09
25- 50 2.187e-08 1.233e-08
50-150 4.100e-08 2.687e-08
15-150 7.488e-08 4.500e-08
Double BB
R1^2/D10^2 : 7.90985E-05 (-7.90961e-05 -7.90961e-05)
kT2 [keV] : 10.4457 (-1.85854 2.68115)
R2^2/D10^2 : 0.445260 (-0.248417 0.233353)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.26 using 59 PHA bins.
#Fit statistic : Chi-Squared = 44.77 using 59 PHA bins.
#Fit statistic : Chi-Squared = 44.65 using 59 PHA bins.
# Reduced chi-squared = 0.8410 for 55 degrees of freedom
# Reduced chi-squared = 0.8140 for 55 degrees of freedom
# Reduced chi-squared = 0.8119 for 55 degrees of freedom
# Null hypothesis probability = 7.933014e-01
# Null hypothesis probability = 8.360973e-01
# Null hypothesis probability = 8.393157e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.010e-08 6.060e-09
25- 50 2.670e-08 1.630e-08
50-150 2.447e-08 1.605e-08
15-150 6.127e-08 3.519e-08
Plot creation:
Mon Aug 6 05:58:40 EDT 2018