batgrbproduct analysis for trigger=867987
batgrbproduct Analysis for Trigger=867987
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): Sun Oct 21 17:57:23 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger867987/GCN5_download_cron
======================================================================
Trigger: 00867987 Segment: 000
BAT Trigger Time: 561754855.296 [s; MET]
Trigger Stop: 561754855.424 [s; MET]
UTC: 2018-10-20T19:00:33.510100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 13.9670984422145 Dec: -47.3799961910664 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.26
Image Trigger?: NO
Rate S/N Ratio: 28.9309522829789 [ if not an image trigger ]
Image S/N Ratio: 8.26
Flight Position: [ source = BAT ]
RA: 13.9670984422145 Dec: -47.3799961910664 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 13.9868623321715 Dec: -47.3716841057868 [deg; J2000]
{ 00h 55m 56.8s , -47d 22' 18.1" }
+/- 0.581130239070835 [arcmin] (estimated 90% radius based on SNR)
+/- 0.139139096531056 [arcmin] (formal 1-sigma fit error)
SNR: 66.0496558777664
Angular difference between Flight and Ground position is 0.945296 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 238.024000048637 +/- 11.58881809789
Measured from: 0.800000071525574
to: 238.824000120163 [s; relative to TRIGTIME]
T50: 16.0599999427795 +/- 4.87504674487273
Measured from: 4.52400016784668
to: 20.5840001106262 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.26399993896484
to: 8.26399993896484 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.44799995422363
to: 271.203999996185 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.033375 4.379395 3.965776 1.071260
0.110823 0.117736 0.108480 0.104280 [error]
Peak 0.174279 0.335611 0.390650 0.129983
0.010215 0.012820 0.013917 0.011627 [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 8.16e-07 1.75e-06 2.95e-06 1.14e-05 8.11e-06 1.69e-05 erg/cm2
Error 5.29e-08 6.43e-08 1.10e-07 1.01e-06 2.75e-07 1.07e-06 erg/cm2
Peak flux Power-law 1.50e+00 2.21e+00 2.43e+00 5.01e+00 7.66e+00 1.11e+01 ph/cm2/s
Error 1.30e-01 1.13e-01 1.08e-01 5.07e-01 3.11e-01 5.54e-01 ph/cm2/s
Fluence Cutoff-PL 7.96e-07 1.76e-06 2.98e-06 9.89e-06 8.05e-06 1.54e-05 erg/cm2
Error 6.80e-08 6.68e-08 1.23e-07 2.01e-06 3.07e-07 2.53e-06 erg/cm2
Peak flux Cutoff-PL 1.43e+00 2.22e+00 2.48e+00 4.16e+00 7.60e+00 1.03e+01 ph/cm2/s
Error 1.70e-01 1.18e-01 1.36e-01 1.01e+00 3.25e-01 1.05e+00 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 1.247 0.060 - - 2.97e-03 9.08e-05 52.410 57
CPL 1.148 0.182 479.7 0.0 3.29e-03 6.39e-04 51.870 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.863 0.074 - - 6.68e-02 2.71e-03 67.100 57
CPL 0.687 0.264 437.3 0.0 7.96e-02 2.12e-02 66.010 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: 259.712000 sec.
T50 in the 50-300 keV band: 9.856000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 272.652 -1.448 271.204
T90 238.024 0.800 238.824
T50 16.060 4.524 20.584
Peak 1.000 7.264 8.264
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
13.9869 -47.3717 0.0029 12.1 64.7 6.9797 66.0 TRIG_00867987
------------------------------------------
Foreground time interval of the image:
-1.448 8.905 (delta_t = 10.353 [sec])
Background time interval of the image:
-239.296 -1.448 (delta_t = 237.848 [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 -1.448 sec. to 271.204 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24690 ( -0.0600872 0.059919 )
Norm@50keV : 2.96838E-03 ( -9.08419e-05 9.08322e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.41 using 59 PHA bins.
# Reduced chi-squared = 0.9195 for 57 degrees of freedom
# Null hypothesis probability = 6.476688e-01
Photon flux (15-150 keV) in 272.7 sec: 0.350902 ( -0.0113867 0.0114244 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.10786e-06 ( -2.74023e-07 2.75282e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.448 sec. to 271.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14777 ( -0.239072 0.125215 )
Epeak [keV] : 479.681 ( -479.643 -479.643 )
Norm@50keV : 3.28962E-03 ( -0.000383301 0.000894856 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.87 using 59 PHA bins.
# Reduced chi-squared = 0.9262 for 56 degrees of freedom
# Null hypothesis probability = 6.319332e-01
Photon flux (15-150 keV) in 272.7 sec: 0.348407 ( -0.012648 0.012668 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.05199e-06 ( -3.08015e-07 3.05915e-07 ) ergs/cm2
Band function
Time interval is from -1.448 sec. to 271.204 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14530 ( 0.821492 0.821492 )
beta : -1.39204 ( 1.52161 0.328378 )
Epeak [keV] : 476.143 ( -477.398 -477.398 )
Norm@50keV : 3.29361E-03 ( -0.0004687 0.000777459 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.88 using 59 PHA bins.
# Reduced chi-squared = 0.9432 for 55 degrees of freedom
# Null hypothesis probability = 5.947039e-01
Photon flux (15-150 keV) in 272.7 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] : 19.1380 ( )
R^2/D10^2 : 1.78093E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 236.45 using 59 PHA bins.
# Reduced chi-squared = 4.1482 for 57 degrees of freedom
# Null hypothesis probability = 1.023487e-23
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.487e-07 2.250e-08
25- 50 1.686e-06 6.777e-08
50-150 4.544e-06 2.618e-07
15-150 6.579e-06 2.550e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 1.47006 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 131.73 using 59 PHA bins.
# Reduced chi-squared = 2.3110 for 57 degrees of freedom
# Null hypothesis probability = 7.540428e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.982e-07 3.095e-08
25- 50 1.920e-06 6.504e-08
50-150 4.212e-06 1.377e-07
15-150 7.130e-06 2.577e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.14833 (-0.960585 1.11219)
R1^2/D10^2 : 0.272929 (-0.103213 0.182598)
kT2 [keV] : 29.4014 (-2.96894 4.19391)
R2^2/D10^2 : 3.78063E-03 (-0.00135307 0.0016513)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.40 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.222091e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.653e-07 9.504e-08
25- 50 1.753e-06 1.625e-07
50-150 5.472e-06 3.995e-07
15-150 7.990e-06 5.890e-07
Peak spectrum fit
Power-law model
Time interval is from 7.264 sec. to 8.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.863292 ( -0.0746639 0.0741357 )
Norm@50keV : 6.67589E-02 ( -0.00271714 0.00271192 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.10 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 57 degrees of freedom
# Null hypothesis probability = 1.693179e-01
Photon flux (15-150 keV) in 1 sec: 7.66230 ( -0.310711 0.310797 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.60134e-07 ( -3.51412e-08 3.52811e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.264 sec. to 8.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.686809 ( -0.304365 0.223729 )
Epeak [keV] : 437.254 ( -437.253 -437.253 )
Norm@50keV : 7.96376E-02 ( -0.0150583 0.0272667 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.01 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 56 degrees of freedom
# Null hypothesis probability = 1.693987e-01
Photon flux (15-150 keV) in 1 sec: 7.60296 ( -0.32512 0.32455 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.53684e-07 ( -3.7354e-08 3.7124e-08 ) ergs/cm2
Band function
Time interval is from 7.264 sec. to 8.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.849280 ( 0.8492 0.8492 )
beta : -0.879762 ( -0.0741299 0.0746805 )
Epeak [keV] : 10000.00 ( -10000 -10000 )
Norm@50keV : 6.71667E-02 ( -0.00269487 0.00269026 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.04 using 59 PHA bins.
# Reduced chi-squared = 1.219 for 55 degrees of freedom
# Null hypothesis probability = 1.279461e-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] : 23.9724 ( )
R^2/D10^2 : 0.216832 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 146.29 using 59 PHA bins.
# Reduced chi-squared = 2.5664 for 57 degrees of freedom
# Null hypothesis probability = 8.710620e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.212e-08 1.855e-09
25- 50 1.228e-07 7.150e-09
50-150 5.258e-07 3.740e-08
15-150 6.707e-07 3.710e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 29.4323 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 283.03 using 59 PHA bins.
# Reduced chi-squared = 4.9655 for 57 degrees of freedom
# Null hypothesis probability = 1.051854e-31
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.329e-08 3.240e-09
25- 50 1.410e-07 7.100e-09
50-150 3.092e-07 1.770e-08
15-150 5.235e-07 2.570e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.63325 (-1.61625 2.06294)
R1^2/D10^2 : 3.31053 (-1.66679 4.02135)
kT2 [keV] : 34.3472 (-4.27846 7.1308)
R2^2/D10^2 : 6.67068E-02 (-0.0291297 0.0342168)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.89 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 55 degrees of freedom
# Null hypothesis probability = 1.306113e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.490e-08 1.016e-08
25- 50 1.274e-07 1.739e-08
50-150 5.844e-07 7.715e-08
15-150 7.568e-07 1.033e-07
Plot creation:
Sun Oct 21 18:01:42 EDT 2018