batgrbproduct analysis for trigger=863186
batgrbproduct Analysis for Trigger=863186
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 Sep 25 20:02:05 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger863186/GCN5_download_cron
======================================================================
Trigger: 00863186 Segment: 000
BAT Trigger Time: 559495364.032 [s; MET]
Trigger Stop: 559495368.128 [s; MET]
UTC: 2018-09-24T15:22:22.386320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 49.1609350574153 Dec: -58.5055477959711 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.17
Image Trigger?: NO
Rate S/N Ratio: 10.4880884817015 [ if not an image trigger ]
Image S/N Ratio: 7.17
Flight Position: [ source = BAT ]
RA: 49.1609350574153 Dec: -58.5055477959711 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 49.2151231341662 Dec: -58.525487531215 [deg; J2000]
{ 03h 16m 51.6s , -58d 31' 31.8" }
+/- 1.41315973239946 [arcmin] (estimated 90% radius based on SNR)
+/- 0.52626579970331 [arcmin] (formal 1-sigma fit error)
SNR: 18.559208292342
Angular difference between Flight and Ground position is 2.077180 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 85.5919998884201 +/- 11.8408677727485
Measured from: -67.1839997768402
to: 18.4080001115799 [s; relative to TRIGTIME]
T50: 50.9559999704361 +/- 4.49904881592429
Measured from: -48.4639998674393
to: 2.49200010299683 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.72800004482269
to: 3.72800004482269 [s; relative to TRIGTIME]
Total Fluence
Measured from: -84.6799999475479
to: 26.3480000495911 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.000135 1.011701 0.582701 0.059351
0.061651 0.063440 0.054883 0.047140 [error]
Peak 0.028992 0.026277 0.023643 0.007909
0.006235 0.006404 0.005520 0.004630 [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 2.84e-07 4.01e-07 4.20e-07 8.10e-07 1.36e-06 1.92e-06 erg/cm2
Error 3.07e-08 2.87e-08 5.24e-08 2.05e-07 1.18e-07 2.57e-07 erg/cm2
Peak flux Power-law 2.31e-01 2.07e-01 1.28e-01 1.20e-01 6.17e-01 6.87e-01 ph/cm2/s
Error 7.68e-02 4.71e-02 4.30e-02 7.83e-02 1.40e-01 1.62e-01 ph/cm2/s
Fluence Cutoff-PL 2.80e-07 4.08e-07 4.18e-07 6.08e-07 1.34e-06 1.71e-06 erg/cm2
Error 3.36e-08 3.57e-08 5.47e-08 3.87e-07 1.39e-07 4.29e-07 erg/cm2
Peak flux Cutoff-PL 2.17e-01 2.24e-01 1.31e-01 5.57e-02 6.07e-01 6.27e-01 ph/cm2/s
Error 8.57e-02 6.15e-02 4.85e-02 7.22e-02 1.42e-01 1.78e-01 ph/cm2/s
Fluence Band 2.72e-07 4.15e-07 4.05e-07 7.05e-07 1.33e-06 1.81e-06 erg/cm2
Error 3.42e-08 -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.16e-01 2.23e-01 1.32e-01 5.79e-02 6.08e-01 6.29e-01 ph/cm2/s
Error 8.57e-02 -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.934 0.142 - - 1.33e-03 1.18e-04 64.370 57
CPL 1.786 0.502 62.0 0.0 1.62e-03 0.00e+00 64.130 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.697 0.397 - - 4.65e-03 1.21e-03 41.550 57
CPL 1.085 1.543 66.5 0.0 1.02e-02 0.00e+00 41.010 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: 90.816000 sec.
T50 in the 50-300 keV band: 55.104000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 111.028 -84.680 26.348
T90 85.592 -67.184 18.408
T50 50.956 -48.464 2.492
Peak 1.000 2.728 3.728
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
49.2151 -58.5255 0.0103 8.2 145.9 2.8843 18.6 TRIG_00863186
------------------------------------------
Foreground time interval of the image:
-84.680 26.348 (delta_t = 111.028 [sec])
Background time interval of the image:
-239.032 -173.702 (delta_t = 65.330 [sec])
-173.032 -84.680 (delta_t = 88.352 [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 -84.680 sec. to 26.348 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93360 ( -0.139792 0.14442 )
Norm@50keV : 1.33248E-03 ( -0.000119446 0.000117391 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.37 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 57 degrees of freedom
# Null hypothesis probability = 2.342771e-01
Photon flux (15-150 keV) in 111 sec: 0.194011 ( -0.0139333 0.0139397 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36053e-06 ( -1.1722e-07 1.19139e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -84.680 sec. to 26.348 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78592 ( -0.55766 0.446174 )
Epeak [keV] : 61.9530 ( )
Norm@50keV : 1.61602E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.13 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 56 degrees of freedom
# Null hypothesis probability = 2.130254e-01
Photon flux (15-150 keV) in 111 sec: 0.192538 ( -0.014736 0.014712 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33724e-06 ( -1.41148e-07 1.37063e-07 ) ergs/cm2
Band function
Time interval is from -84.680 sec. to 26.348 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.78596 ( 1.71764 0.465211 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 61.8989 ( -42.2469 -61.8989 )
Norm@50keV : 1.61575E-03 ( -0.000392534 0.00170076 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.13 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 55 degrees of freedom
# Null hypothesis probability = 1.869902e-01
Photon flux (15-150 keV) in 111 sec: 0.192422 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33031e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.75756 (-0.9059 1.03553)
R^2/D10^2 : 9.57977E-02 (-0.0306246 0.0438059)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 111.91 using 59 PHA bins.
# Reduced chi-squared = 1.9634 for 57 degrees of freedom
# Null hypothesis probability = 1.934581e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.044e-07 2.581e-08
25- 50 4.906e-07 4.201e-08
50-150 2.384e-07 5.078e-08
15-150 9.334e-07 8.286e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 76.1339 (-17.3152 26.3251)
Norm : 0.916040 (-0.103981 0.123501)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.12 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 57 degrees of freedom
# Null hypothesis probability = 1.910277e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.629e-07 2.608e-08
25- 50 4.275e-07 3.352e-08
50-150 5.834e-07 1.202e-07
15-150 1.274e-06 1.481e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.17511 (-0.94296 1.0009)
R1^2/D10^2 : 0.424712 (-0.179063 0.366343)
kT2 [keV] : 24.1819 (-5.322 9.14604)
R2^2/D10^2 : 2.28930E-03 (-0.00152762 0.0035285)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.39 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 55 degrees of freedom
# Null hypothesis probability = 2.873318e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.749e-07 5.783e-08
25- 50 4.103e-07 7.970e-08
50-150 6.648e-07 3.393e-07
15-150 1.350e-06 4.431e-07
Peak spectrum fit
Power-law model
Time interval is from 2.728 sec. to 3.728 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69732 ( -0.381908 0.412723 )
Norm@50keV : 4.65315E-03 ( -0.00123747 0.00119146 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.55 using 59 PHA bins.
# Reduced chi-squared = 0.7289 for 57 degrees of freedom
# Null hypothesis probability = 9.381498e-01
Photon flux (15-150 keV) in 1 sec: 0.617412 ( -0.139793 0.139802 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.30922e-08 ( -1.16458e-08 1.20989e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.728 sec. to 3.728 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08496 ( -1.93086 1.15433 )
Epeak [keV] : 66.4592 ( )
Norm@50keV : 1.02431E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.01 using 59 PHA bins.
# Reduced chi-squared = 0.7323 for 56 degrees of freedom
# Null hypothesis probability = 9.335416e-01
Photon flux (15-150 keV) in 1 sec: 0.607340 ( -0.141528 0.141609 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.08204e-08 ( -1.23003e-08 1.31489e-08 ) ergs/cm2
Band function
Time interval is from 2.728 sec. to 3.728 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94469 ( -6.94469 -4.94469 )
beta : -1.86232 ( -0.685418 0.456502 )
Epeak [keV] : 23.8739 ( -23.8739 95.5703 )
Norm@50keV : 749.620 ( -168.17 4.48622e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.61 using 59 PHA bins.
# Reduced chi-squared = 0.7384 for 55 degrees of freedom
# Null hypothesis probability = 9.263059e-01
Photon flux (15-150 keV) in 1 sec: 0.607613 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.10862e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9828 (-3.1915 4.41422)
R^2/D10^2 : 0.154022 (-0.103962 0.317523)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.28 using 59 PHA bins.
# Reduced chi-squared = 0.7943 for 57 degrees of freedom
# Null hypothesis probability = 8.687101e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.677e-09 2.560e-09
25- 50 1.470e-08 6.346e-09
50-150 1.267e-08 6.973e-09
15-150 3.205e-08 1.334e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 127.989 (-72.368 -124.734)
Norm : 2.59843 (-0.645417 0.977106)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.08 using 59 PHA bins.
# Reduced chi-squared = 0.7206 for 57 degrees of freedom
# Null hypothesis probability = 9.445933e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.748e-09 3.960e-09
25- 50 1.220e-08 6.990e-09
50-150 2.246e-08 1.491e-08
15-150 4.141e-08 2.563e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.47200 (-2.8952 5.16263)
R1^2/D10^2 : 1.64192 (-1.45514 38.4886)
kT2 [keV] : 19.7157 (-7.63027 60.1443)
R2^2/D10^2 : 1.98840E-02 (-0.019669 0.11415)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.53 using 59 PHA bins.
# Reduced chi-squared = 0.7369 for 55 degrees of freedom
# Null hypothesis probability = 9.275927e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.151e-09 4.277e-09
25- 50 1.197e-08 6.520e-09
50-150 2.154e-08 1.319e-08
15-150 4.067e-08 2.068e-08
Plot creation:
Tue Sep 25 20:07:21 EDT 2018