batgrbproduct Analysis for Trigger=455967
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): Sat Jun 25 03:43:53 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger455967/GCN5_download_cron
======================================================================
Trigger: 00455967 Segment: 000
BAT Trigger Time: 330618432 [s; MET]
Trigger Stop: 330618752 [s; MET]
UTC: 2011-06-24T14:27:04.910920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 280.265538326291 Dec: -5.62801953361831 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.91
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.91
Flight Position: [ source = BAT ]
RA: 280.265538326291 Dec: -5.62801953361831 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.186910690961 Dec: -5.61874781038565 [deg; J2000]
{ 18h 40m 44.9s , -05d 37' 07.5" }
+/- 4.20839962168516 [arcmin] (estimated 90% radius based on SNR)
+/- 1.82321130088837 [arcmin] (formal 1-sigma fit error)
SNR: 3.90411592257685
Angular difference between Flight and Ground position is 4.727798 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.534301 0.540450 0.001354 -0.016478
0.141011 0.142413 0.128303 0.126052 [error]
Peak 0.534301 0.540450 0.001354 -0.016478
0.141011 0.142413 0.128303 0.126052 [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 1.74e-07 1.61e-07 1.03e-07 1.02e-07 4.80e-07 5.38e-07 erg/cm2
Error 5.96e-08 6.69e-08 8.08e-08 1.65e-07 2.09e-07 3.00e-07 erg/cm2
Peak flux Power-law 1.79e-02 9.28e-03 2.98e-03 1.23e-03 3.09e-02 3.14e-02 ph/cm2/s
Error 4.78e-03 3.72e-03 2.26e-03 1.85e-03 1.02e-02 1.05e-02 ph/cm2/s
Fluence Cutoff-PL 1.82e-07 2.04e-07 1.71e-08 1.65e-11 4.02e-07 4.02e-07 erg/cm2
Error 6.87e-08 1.02e-07 6.19e-08 1.98e-08 1.53e-07 1.53e-07 erg/cm2
Peak flux Cutoff-PL 1.81e-02 1.22e-02 5.85e-04 3.03e-07 3.09e-02 3.09e-02 ph/cm2/s
Error 7.16e-03 5.70e-03 1.85e-03 2.89e-04 9.53e-03 9.53e-03 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.635 0.710 - - 1.44e-04 8.53e-05 63.700 57
CPL -1.367 0.000 24.7 0.0 9.67e-02 0.00e+00 60.140 56
The chi2 of BB fit is which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.635 0.710 - - 1.44e-04 8.53e-05 63.700 57
CPL -1.367 0.000 24.7 0.0 9.67e-02 0.00e+00 60.140 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.1869 -5.6187 0.0493 21.1 98.2 1.5254 3.9 TRIG_00455967
------------------------------------------
Foreground time interval of the image:
0.000 320.000 (delta_t = 320.000 [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 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.63454 ( -0.612303 0.806754 )
Norm@50keV : 1.44421E-04 ( -8.06728e-05 8.99282e-05 )
------------------------------------------------------------
# Chi-Squared = 63.70 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 57 degrees of freedom
# Null hypothesis probability = 2.527038e-01
Photon flux (15-150 keV) in 320 sec: 3.08622E-02 ( -0.0100952 0.010218 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.79843e-07 ( -1.92917e-07 2.25272e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.36705 ( )
Epeak [keV] : 24.6641 ( )
Norm@50keV : 9.67429E-02 ( )
------------------------------------------------------------
# Chi-Squared = 60.14 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 56 degrees of freedom
# Null hypothesis probability = 3.281849e-01
Photon flux (15-150 keV) in 320 sec: 3.08963E-02 ( -0.0094908 0.0095645 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.02432e-07 ( -1.39294e-07 1.66042e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.07282 ( -8.96536 -6.9403 )
beta : -9.37167 ( 10 19.994 )
Epeak [keV] : 25.3318 ( -6.30933 5.95918 )
Norm@50keV : 1.68653 ( -1.62512 19.195 )
------------------------------------------------------------
# Chi-Squared = 60.05 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Null hypothesis probability = 2.979017e-01
Photon flux (15-150 keV) in 320 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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.63454 ( -0.612303 0.806754 )
Norm@50keV : 1.44421E-04 ( -8.06728e-05 8.99282e-05 )
------------------------------------------------------------
# Chi-Squared = 63.70 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 57 degrees of freedom
# Null hypothesis probability = 2.527038e-01
Photon flux (15-150 keV) in 320 sec: 3.08622E-02 ( -0.0100952 0.010218 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.79843e-07 ( -1.92917e-07 2.25272e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.36705 ( )
Epeak [keV] : 24.6641 ( )
Norm@50keV : 9.67429E-02 ( )
------------------------------------------------------------
# Chi-Squared = 60.14 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 56 degrees of freedom
# Null hypothesis probability = 3.281849e-01
Photon flux (15-150 keV) in 320 sec: 3.08963E-02 ( -0.0094908 0.0095645 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.02432e-07 ( -1.39294e-07 1.66042e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.99108 ( -4.01956 -2.00312 )
beta : -9.37167 ( 10 19.9983 )
Epeak [keV] : 25.0970 ( -6.32118 7.45859 )
Norm@50keV : 0.271282 ( -0.355838 179.022 )
------------------------------------------------------------
# Chi-Squared = 60.07 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Null hypothesis probability = 2.973276e-01
Photon flux (15-150 keV) in 320 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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Plot creation:
Sat Jun 25 03:55:17 EDT 2011