batgrbproduct analysis for trigger=874475
batgrbproduct Analysis for Trigger=874475
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): Tue Dec 4 12:47:19 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger874475/GCN5_download_cron
======================================================================
Trigger: 00874475 Segment: 000
BAT Trigger Time: 565531749.888 [s; MET]
Trigger Stop: 565531750.912 [s; MET]
UTC: 2018-12-03T12:08:47.866980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 108.368923591337 Dec: -39.7690778271218 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.24
Image Trigger?: NO
Rate S/N Ratio: 14.8323969741913 [ if not an image trigger ]
Image S/N Ratio: 8.24
Flight Position: [ source = BAT ]
RA: 108.368923591337 Dec: -39.7690778271218 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 108.340472270665 Dec: -39.7823939871893 [deg; J2000]
{ 07h 13m 21.7s , -39d 46' 56.6" }
+/- 1.28624571956076 [arcmin] (estimated 90% radius based on SNR)
+/- 0.434365340629039 [arcmin] (formal 1-sigma fit error)
SNR: 21.2295759414953
Angular difference between Flight and Ground position is 1.536116 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 15.1719999313354 +/- 1.70713439981499
Measured from: -1.0479998588562
to: 14.1240000724792 [s; relative to TRIGTIME]
T50: 8.25999999046326 +/- 0.962124693396819
Measured from: 1.32800006866455
to: 9.58800005912781 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.0239999294281
to: 2.0239999294281 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.96000003814697
to: 15.6159999370575 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.456021 0.540952 0.324719 0.071881
0.034440 0.036258 0.031093 0.025934 [error]
Peak 0.031616 0.050701 0.046635 0.022534
0.008436 0.008984 0.007821 0.006414 [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 1.41e-07 2.17e-07 2.50e-07 5.51e-07 7.71e-07 1.16e-06 erg/cm2
Error 1.71e-08 1.68e-08 3.08e-08 1.40e-07 7.09e-08 1.69e-07 erg/cm2
Peak flux Power-law 2.81e-01 3.39e-01 2.96e-01 4.43e-01 1.07e+00 1.36e+00 ph/cm2/s
Error 1.10e-01 7.65e-02 6.43e-02 2.26e-01 2.03e-01 2.66e-01 ph/cm2/s
Fluence Cutoff-PL 1.40e-07 2.19e-07 2.50e-07 4.59e-07 7.63e-07 1.07e-06 erg/cm2
Error 1.44e-08 2.05e-08 3.13e-08 2.58e-07 7.98e-08 2.73e-07 erg/cm2
Peak flux Cutoff-PL 2.96e-01 3.45e-01 2.91e-01 4.13e-01 1.08e+00 1.34e+00 ph/cm2/s
Error 1.11e-01 7.75e-02 6.50e-02 -------- 2.05e-01 2.05e-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 1.796 0.147 - - 4.76e-03 4.25e-04 57.730 57
CPL 1.696 0.418 135.6 0.0 5.41e-03 0.00e+00 57.640 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.196 0.370 - - 9.14e-03 1.66e-03 56.410 57
CPL 1.193 0.374 10000.0 0.0 9.18e-03 -3.76e-03 56.430 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: 17.408000 sec.
T50 in the 50-300 keV band: 8.896000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 17.576 -1.960 15.616
T90 15.172 -1.048 14.124
T50 8.260 1.328 9.588
Peak 1.000 1.024 2.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
108.3405 -39.7824 0.0090 21.6 156.9 1.3973 21.2 TRIG_00874475
------------------------------------------
Foreground time interval of the image:
-1.960 14.313 (delta_t = 16.273 [sec])
Background time interval of the image:
-239.888 -1.960 (delta_t = 237.928 [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 -1.960 sec. to 15.616 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79636 ( -0.144539 0.148597 )
Norm@50keV : 4.76095E-03 ( -0.000428329 0.000421538 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.73 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.479164e-01
Photon flux (15-150 keV) in 17.58 sec: 0.655127 ( -0.0511516 0.0511963 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.70626e-07 ( -7.04262e-08 7.1341e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.960 sec. to 15.616 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69573 ( -0.592147 0.24455 )
Epeak [keV] : 135.621 ( )
Norm@50keV : 5.40676E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.64 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 56 degrees of freedom
# Null hypothesis probability = 4.144508e-01
Photon flux (15-150 keV) in 17.58 sec: 0.652021 ( -0.053711 0.026746 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.6309e-07 ( -8.24221e-08 7.72623e-08 ) ergs/cm2
Band function
Time interval is from -1.960 sec. to 15.616 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32839 ( 1.32833 1.32833 )
beta : -1.89347 ( 1.89498 0.230759 )
Epeak [keV] : 50.8446 ( -51.4327 -51.4327 )
Norm@50keV : 9.31186E-03 ( -0.00476923 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.29 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 55 degrees of freedom
# Null hypothesis probability = 3.903370e-01
Photon flux (15-150 keV) in 17.58 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] : 11.1871 (-1.07697 1.22527)
R^2/D10^2 : 0.199047 (-0.0638263 0.0917258)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 98.67 using 59 PHA bins.
# Reduced chi-squared = 1.731 for 57 degrees of freedom
# Null hypothesis probability = 5.137508e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.179e-08 1.351e-08
25- 50 2.652e-07 2.452e-08
50-150 1.899e-07 4.011e-08
15-150 5.469e-07 5.230e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 104.102 (-28.2993 46.8791)
Norm : 2.84706 (-0.297772 0.364527)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.94 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 57 degrees of freedom
# Null hypothesis probability = 4.042784e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.308e-07 1.693e-08
25- 50 2.280e-07 1.995e-08
50-150 3.779e-07 1.438e-07
15-150 7.367e-07 1.507e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.94855 (-1.5962 1.54626)
R1^2/D10^2 : 0.873282 (-0.424494 1.28338)
kT2 [keV] : 27.4812 (-8.17487 19.5466)
R2^2/D10^2 : 5.33846E-03 (-0.00431196 0.014677)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.50 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 55 degrees of freedom
# Null hypothesis probability = 3.152182e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.298e-07 3.174e-08
25- 50 2.289e-07 5.713e-08
50-150 4.068e-07 2.007e-07
15-150 7.655e-07 2.650e-07
Peak spectrum fit
Power-law model
Time interval is from 1.024 sec. to 2.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19586 ( -0.378932 0.361249 )
Norm@50keV : 9.13639E-03 ( -0.00165818 0.00165781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.41 using 59 PHA bins.
# Reduced chi-squared = 0.9896 for 57 degrees of freedom
# Null hypothesis probability = 4.973353e-01
Photon flux (15-150 keV) in 1 sec: 1.07180 ( -0.202811 0.203199 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.2795e-08 ( -1.90133e-08 1.92529e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.024 sec. to 2.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19296 ( -0.407262 0.340294 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 9.17947E-03 ( -0.00166544 -0.00917947 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.43 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 56 degrees of freedom
# Null hypothesis probability = 4.588960e-01
Photon flux (15-150 keV) in 1 sec: 1.07894 ( -0.212304 0.19748 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.2558e-08 ( -1.86161e-08 1.8322e-08 ) ergs/cm2
Band function
Time interval is from 1.024 sec. to 2.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.965999 ( 0.965999 0.965999 )
beta : -1.19579 ( 1.19578 0.378912 )
Epeak [keV] : 51.0465 ( -50.9041 -50.9041 )
Norm@50keV : 1.61660E-02 ( -0.00868649 1.45124 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.41 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.221569e-01
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] : 24.3049 (-8.32855 12.9428)
R^2/D10^2 : 2.50010E-02 (-0.017335 0.0686941)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.35 using 59 PHA bins.
# Reduced chi-squared = 1.252 for 57 degrees of freedom
# Null hypothesis probability = 9.572054e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.604e-09 1.212e-09
25- 50 1.456e-08 5.720e-09
50-150 6.399e-08 2.537e-08
15-150 8.115e-08 3.366e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-68.8318 -200)
Norm : 4.42114 (-0.823148 0.823148)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.50 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 57 degrees of freedom
# Null hypothesis probability = 3.505981e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.101e-08 6.430e-09
25- 50 2.118e-08 1.217e-08
50-150 4.645e-08 2.669e-08
15-150 7.863e-08 4.493e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.19586 (-2.31813 2.88277)
R1^2/D10^2 : 1.12604 (-0.800411 2.12923)
kT2 [keV] : 57.2769 (-26.0825 -57.2769)
R2^2/D10^2 : 2.12417E-03 (-0.00192926 0.00817858)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.75 using 59 PHA bins.
# Reduced chi-squared = 0.9592 for 55 degrees of freedom
# Null hypothesis probability = 5.609215e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.031e-08 6.060e-09
25- 50 1.899e-08 1.002e-08
50-150 7.278e-08 3.967e-08
15-150 1.021e-07 5.380e-08
Plot creation:
Tue Dec 4 12:50:24 EST 2018