batgrbproduct Analysis for Trigger=655450
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Mon Sep 14 09:44:17 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger655450/GCN5_download_cron
======================================================================
Trigger: 00655450 Segment: 000
BAT Trigger Time: 463836528 [s; MET]
Trigger Stop: 463836592 [s; MET]
UTC: 2015-09-13T11:28:32.871440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.94012680964 Dec: -15.8746803269467 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 17.1
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.1
Flight Position: [ source = BAT ]
RA: 244.94012680964 Dec: -15.8746803269467 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.948767000556 Dec: -15.8253376263872 [deg; J2000]
{ 16h 19m 47.7s , -15d 49' 31.2" }
+/- 1.19590588153653 [arcmin] (estimated 90% radius based on SNR)
+/- 0.323408334078801 [arcmin] (formal 1-sigma fit error)
SNR: 23.5571454353153
Angular difference between Flight and Ground position is 3.002271 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.065754 0.121578 0.078255 0.025262
0.052678 0.048132 0.039859 0.034720 [error]
Peak 2.065754 0.121578 0.078255 0.025262
0.052678 0.048132 0.039859 0.034720 [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 5.92e-07 7.80e-08 4.53e-09 2.77e-10 6.75e-07 6.75e-07 erg/cm2
Error 6.18e-08 1.86e-08 2.63e-09 2.82e-10 6.48e-08 6.48e-08 erg/cm2
Peak flux Power-law 3.27e-01 2.52e-02 7.32e-04 2.18e-05 3.53e-01 3.53e-01 ph/cm2/s
Error 3.52e-02 5.72e-03 4.15e-04 2.16e-05 3.54e-02 3.54e-02 ph/cm2/s
Fluence Cutoff-PL 6.06e-07 4.67e-08 3.17e-11 5.64e-18 6.53e-07 6.53e-07 erg/cm2
Error 6.59e-08 2.30e-08 7.50e-10 2.67e-12 6.73e-08 6.73e-08 erg/cm2
Peak flux Cutoff-PL 3.32e-01 1.62e-02 5.81e-06 5.34e-13 3.48e-01 3.48e-01 ph/cm2/s
Error 3.79e-02 7.28e-03 1.28e-04 2.34e-07 3.78e-02 3.78e-02 ph/cm2/s
Fluence Band 5.53e-07 2.09e-08 2.35e-10 2.65e-12 5.75e-07 5.75e-07 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 6.108 0.482 - - 7.70e-05 3.65e-05 53.350 57
CPL 1.000 0.000 50.0 0.0 2.19e-03 0.00e+00 271.270 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.108 0.482 - - 7.70e-05 3.65e-05 53.350 57
CPL 1.000 0.000 50.0 0.0 2.19e-03 0.00e+00 271.270 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.9488 -15.8253 0.0081 0.0 75.4 2.3833 23.6 TRIG_00655450
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.10758 ( -0.474864 0.489677 )
Norm@50keV : 7.69781E-05 ( -2.9609e-05 4.3351e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.35 using 59 PHA bins.
# Reduced chi-squared = 0.9360 for 57 degrees of freedom
# Null hypothesis probability = 6.128000e-01
Photon flux (15-150 keV) in 64 sec: 0.352995 ( -0.0353703 0.0354371 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.74989e-07 ( -6.47629e-08 6.4784e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.18742E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 271.27 using 59 PHA bins.
# Reduced chi-squared = 4.8441 for 56 degrees of freedom
# Null hypothesis probability = 5.330834e-30
Photon flux (15-150 keV) in 64 sec: 0.347984 ( -0.038165 0.037535 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.52634e-07 ( -6.77594e-08 6.68096e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.41123 ( 6.01617 8.41123 )
beta : -6.16566 ( -0.444869 0.525881 )
Epeak [keV] : 403.691 ( -403.691 -403.691 )
Norm@50keV : 9.87465E-03 ( -0.00363679 0.00632704 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.39 using 59 PHA bins.
# Reduced chi-squared = 0.9707 for 55 degrees of freedom
# Null hypothesis probability = 5.363175e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.74897e-07 ( -5.74449e-07 -5.74897e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 2.47841 (-0.19786 0.224016)
R^2/D10^2 : 183.910 (-91.0605 180.475)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.06 using 59 PHA bins.
# Reduced chi-squared = 0.8608 for 57 degrees of freedom
# Null hypothesis probability = 7.635331e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.061e-07 1.523e-07
25- 50 4.301e-08 1.285e-08
50-150 1.248e-11 1.006e-11
15-150 6.491e-07 1.700e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.29567 (-0.49808 0.605473)
Norm : 145.692 (-63.5141 114.266)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.25 using 59 PHA bins.
# Reduced chi-squared = 0.8640 for 57 degrees of freedom
# Null hypothesis probability = 7.576266e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.062e-07 1.234e-07
25- 50 5.322e-08 1.577e-08
50-150 1.209e-10 9.404e-11
15-150 6.596e-07 1.460e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.44147 (-0.201416 0.224645)
R1^2/D10^2 : 204.826 (-102.899 210.846)
kT2 [keV] : 26.1965 (-16.8774 -26.1623)
R2^2/D10^2 : 3.74964E-04 (-0.000375263 0.0101801)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.50 using 59 PHA bins.
# Reduced chi-squared = 0.8274 for 55 degrees of freedom
# Null hypothesis probability = 8.156369e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.071e-07 1.527e-07
25- 50 5.652e-08 1.964e-08
50-150 8.176e-08 6.147e-08
15-150 7.454e-07 2.036e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.10758 ( -0.474864 0.489677 )
Norm@50keV : 7.69781E-05 ( -2.9609e-05 4.3351e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.35 using 59 PHA bins.
# Reduced chi-squared = 0.9360 for 57 degrees of freedom
# Null hypothesis probability = 6.128000e-01
Photon flux (15-150 keV) in 64 sec: 0.352995 ( -0.0353703 0.0354371 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.74989e-07 ( -6.47629e-08 6.4784e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.18742E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 271.27 using 59 PHA bins.
# Reduced chi-squared = 4.8441 for 56 degrees of freedom
# Null hypothesis probability = 5.330834e-30
Photon flux (15-150 keV) in 64 sec: 0.347984 ( -0.038165 0.037535 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.52634e-07 ( -6.77594e-08 6.68096e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.41123 ( 6.01617 8.41123 )
beta : -6.16566 ( -0.444869 0.525881 )
Epeak [keV] : 403.691 ( -403.691 -403.691 )
Norm@50keV : 9.87465E-03 ( -0.00363679 0.00632704 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.39 using 59 PHA bins.
# Reduced chi-squared = 0.9707 for 55 degrees of freedom
# Null hypothesis probability = 5.363175e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.74897e-07 ( -5.74449e-07 -5.74897e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 2.47841 (-0.19786 0.224016)
R^2/D10^2 : 183.910 (-91.0605 180.475)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.06 using 59 PHA bins.
# Reduced chi-squared = 0.8608 for 57 degrees of freedom
# Null hypothesis probability = 7.635331e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.061e-07 1.575e-07
25- 50 4.301e-08 1.304e-08
50-150 1.248e-11 9.911e-12
15-150 6.491e-07 1.535e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.29567 (-0.49808 0.605473)
Norm : 145.692 (-63.5141 114.266)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.25 using 59 PHA bins.
# Reduced chi-squared = 0.8640 for 57 degrees of freedom
# Null hypothesis probability = 7.576266e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.062e-07 1.289e-07
25- 50 5.322e-08 1.288e-08
50-150 1.209e-10 9.110e-11
15-150 6.596e-07 1.302e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.44147 (-0.201416 0.224645)
R1^2/D10^2 : 204.826 (-102.899 210.846)
kT2 [keV] : 26.1965 (-16.8805 -26.1623)
R2^2/D10^2 : 3.74964E-04 (-0.000375263 0.0101801)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.50 using 59 PHA bins.
# Reduced chi-squared = 0.8274 for 55 degrees of freedom
# Null hypothesis probability = 8.156369e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.071e-07 1.353e-07
25- 50 5.652e-08 2.005e-08
50-150 8.176e-08 5.821e-08
15-150 7.454e-07 2.103e-07
Plot creation:
Mon Sep 14 09:47:30 EDT 2015