batgrbproduct analysis for trigger=859282
batgrbproduct Analysis for Trigger=859282
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): Wed Sep 5 19:22:18 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger859282/GCN5_download_cron
======================================================================
Trigger: 00859282 Segment: 000
BAT Trigger Time: 557789333.952 [s; MET]
Trigger Stop: 557789339.456 [s; MET]
UTC: 2018-09-04T21:28:32.411820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.250355605755 Dec: 46.6232891785215 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.12
Image Trigger?: NO
Rate S/N Ratio: 10 [ if not an image trigger ]
Image S/N Ratio: 8.12
Flight Position: [ source = BAT ]
RA: 274.250355605755 Dec: 46.6232891785215 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.259861569459 Dec: 46.6398958297025 [deg; J2000]
{ 18h 17m 02.4s , +46d 38' 23.6" }
+/- 2.38593875633782 [arcmin] (estimated 90% radius based on SNR)
+/- 1.01060516735443 [arcmin] (formal 1-sigma fit error)
SNR: 8.78223605216776
Angular difference between Flight and Ground position is 1.070610 arcmin
Partial Coding Fraction: 0.5625 [ including projection effects ]
Duration
T90: 5.39599990844727 +/- 0.889557167793589
Measured from: 0.484000086784363
to: 5.87999999523163 [s; relative to TRIGTIME]
T50: 3.2279999256134 +/- 1.25478282695361
Measured from: 1.77600014209747
to: 5.00400006771088 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.1360000371933
to: 6.1360000371933 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.279999971389771
to: 6.17999994754791 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.041556 0.124226 0.112279 0.041860
0.018931 0.019465 0.017273 0.015317 [error]
Peak 0.014256 0.023830 0.026899 0.013203
0.007553 0.008072 0.007153 0.006116 [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 1.79e-08 4.43e-08 8.77e-08 4.32e-07 2.37e-07 5.81e-07 erg/cm2
Error 6.50e-09 9.71e-09 1.63e-08 1.88e-07 4.30e-08 1.94e-07 erg/cm2
Peak flux Power-law 1.36e-01 1.58e-01 1.32e-01 1.87e-01 4.94e-01 6.13e-01 ph/cm2/s
Error 9.53e-02 6.92e-02 5.64e-02 1.77e-01 1.89e-01 2.34e-01 ph/cm2/s
Fluence Cutoff-PL 1.62e-08 4.65e-08 9.18e-08 2.15e-07 2.29e-07 3.68e-07 erg/cm2
Error 7.51e-09 1.15e-08 1.88e-08 2.44e-07 4.89e-08 2.28e-07 erg/cm2
Peak flux Cutoff-PL 1.20e-01 1.63e-01 1.40e-01 1.13e-01 4.82e-01 5.37e-01 ph/cm2/s
Error 1.16e-01 7.77e-02 7.24e-02 1.66e-01 2.51e-01 3.04e-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 1.015 0.305 - - 3.73e-03 6.61e-04 57.070 57
CPL 0.514 1.172 159.4 0.0 6.47e-03 1.61e-02 56.610 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.257 0.689 - - 4.17e-03 1.53e-03 47.130 57
CPL 0.725 3.532 132.5 0.0 7.34e-03 0.00e+00 47.040 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: 8.256000 sec.
T50 in the 50-300 keV band: 3.840000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 5.900 0.280 6.180
T90 5.396 0.484 5.880
T50 3.228 1.776 5.004
Peak 1.000 5.136 6.136
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.2599 +46.6399 0.0219 30.3 -48.4 0.3317 8.8 TRIG_00859282
------------------------------------------
Foreground time interval of the image:
0.280 6.180 (delta_t = 5.900 [sec])
Background time interval of the image:
-239.952 0.280 (delta_t = 240.232 [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 0.280 sec. to 6.180 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01495 ( -0.316794 0.292751 )
Norm@50keV : 3.73439E-03 ( -0.000664179 0.000657076 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.07 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.723264e-01
Photon flux (15-150 keV) in 5.9 sec: 0.430320 ( -0.0779438 0.0785196 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3698e-07 ( -4.27931e-08 4.31888e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.280 sec. to 6.180 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.513884 ( -1.5921 0.752508 )
Epeak [keV] : 159.386 ( -159.671 -159.671 )
Norm@50keV : 6.47064E-03 ( -0.00330136 0.0288554 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.61 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 56 degrees of freedom
# Null hypothesis probability = 4.522179e-01
Photon flux (15-150 keV) in 5.9 sec: 0.422300 ( -0.080579 0.080919 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28929e-07 ( -5.01388e-08 4.75634e-08 ) ergs/cm2
Band function
Time interval is from 0.280 sec. to 6.180 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.93608 -5 )
beta : -1.37849 ( -0.534045 0.428425 )
Epeak [keV] : 38.4337 ( -10.2618 9.20469 )
Norm@50keV : 24.5250 ( -4.10961 116.458 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9558 for 55 degrees of freedom
# Null hypothesis probability = 5.680629e-01
Photon flux (15-150 keV) in 5.9 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] : 19.7350 (-4.10847 5.99897)
R^2/D10^2 : 2.15161E-02 (-0.0123908 0.0253211)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.58 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.479999e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.581e-09 3.727e-09
25- 50 4.730e-08 1.471e-08
50-150 1.363e-07 4.629e-08
15-150 1.932e-07 5.785e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-48.2896 -200)
Norm : 1.80918 (-0.324599 0.324599)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.39 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 57 degrees of freedom
# Null hypothesis probability = 2.083632e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.660e-08 1.535e-08
25- 50 5.117e-08 2.893e-08
50-150 1.122e-07 6.455e-08
15-150 1.900e-07 1.088e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.8912 (-3.99037 4.79175)
R1^2/D10^2 : 6.84326E-02 (-0.0473462 0.13746)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 7.20033E-05 (-3.8663e-05 0.000472644)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.28 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.05 using 59 PHA bins.
# Reduced chi-squared = 0.9688 for 55 degrees of freedom
# Reduced chi-squared = 0.9645 for 55 degrees of freedom
# Null hypothesis probability = 5.404623e-01
# Null hypothesis probability = 5.496110e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.506e-08 9.169e-09
25- 50 5.290e-08 3.100e-08
50-150 1.660e-07 7.009e-08
15-150 2.339e-07 9.888e-08
Peak spectrum fit
Power-law model
Time interval is from 5.136 sec. to 6.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25723 ( -0.70571 0.672069 )
Norm@50keV : 4.17041E-03 ( -0.00153358 0.00153325 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.13 using 59 PHA bins.
# Reduced chi-squared = 0.8268 for 57 degrees of freedom
# Null hypothesis probability = 8.213584e-01
Photon flux (15-150 keV) in 1 sec: 0.493842 ( -0.18825 0.190135 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.16579e-08 ( -1.6511e-08 1.68725e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.136 sec. to 6.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.724860 ( -0.723473 6.33971 )
Epeak [keV] : 132.484 ( -132.235 -132.235 )
Norm@50keV : 7.33970E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.04 using 59 PHA bins.
# Reduced chi-squared = 0.8400 for 56 degrees of freedom
# Null hypothesis probability = 7.974328e-01
Photon flux (15-150 keV) in 1 sec: 0.481626 ( -0.303751 0.19882 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.05353e-08 ( -1.74783e-08 1.77405e-08 ) ergs/cm2
Band function
Time interval is from 5.136 sec. to 6.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.729475 ( 0.730111 5.2614 )
beta : -1.74812 ( 1.63648 1.63648 )
Epeak [keV] : 135.399 ( -135.104 -135.104 )
Norm@50keV : 7.22639E-03 ( -0.00450368 0.0329087 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.01 using 59 PHA bins.
# Reduced chi-squared = 0.8547 for 55 degrees of freedom
# Null hypothesis probability = 7.697520e-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] : 19.3400 (-6.60918 12.2316)
R^2/D10^2 : 2.54968E-02 (-0.0254968 0.077468)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.65 using 59 PHA bins.
# Reduced chi-squared = 0.8360 for 57 degrees of freedom
# Null hypothesis probability = 8.065038e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.862e-09 1.222e-09
25- 50 9.069e-09 5.535e-09
50-150 2.501e-08 1.673e-08
15-150 3.594e-08 2.381e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-199.363 -199.363)
Norm : 2.06352 (-0.770067 0.770044)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.70 using 59 PHA bins.
# Reduced chi-squared = 0.8369 for 57 degrees of freedom
# Null hypothesis probability = 8.050843e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.138e-09 3.310e-09
25- 50 9.884e-09 6.140e-09
50-150 2.168e-08 1.353e-08
15-150 3.670e-08 2.358e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.50960 (-3.94947 24.5735)
R1^2/D10^2 : 40.0799 (-53.7527 -53.7527)
kT2 [keV] : 20.8983 (-7.29792 -20.7818)
R2^2/D10^2 : 1.89699E-02 (-0.0195352 0.0298176)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.50 using 59 PHA bins.
#Fit statistic : Chi-Squared = 46.48 using 59 PHA bins.
# Reduced chi-squared = 0.8455 for 55 degrees of freedom
# Reduced chi-squared = 0.8450 for 55 degrees of freedom
# Null hypothesis probability = 7.857094e-01
# Null hypothesis probability = 7.865324e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.252e-09 2.970e-09
25- 50 8.438e-09 5.045e-09
50-150 2.649e-08 1.782e-08
15-150 3.918e-08 2.302e-08
Plot creation:
Wed Sep 5 19:26:58 EDT 2018