batgrbproduct Analysis for Trigger=373691
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): Tue May 31 16:00:16 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger373691/SDC
======================================================================
Trigger: 00373691 Segment: 000
BAT Trigger Time: 278086736 [s; MET]
Trigger Stop: 278086800 [s; MET]
UTC: 2009-10-24T14:18:50.800700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.044323842901 Dec: -22.3252388422827 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.22
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.22
Flight Position: [ source = BAT ]
RA: 268.044323842901 Dec: -22.3252388422827 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 268.054566928411 Dec: -22.2994414682285 [deg; J2000]
{ 17h 52m 13.1s , -22d 17' 58.0" }
+/- 2.42653802437971 [arcmin] (estimated 90% radius based on SNR)
+/- 0.993314619096077 [arcmin] (formal 1-sigma fit error)
SNR: 8.57307862751288
Angular difference between Flight and Ground position is 1.648966 arcmin
Partial Coding Fraction: 0.828125 [ 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 0.217527 0.378046 0.228576 -0.004216
0.054140 0.047914 0.041875 0.037992 [error]
Peak 0.217527 0.378046 0.228576 -0.004216
0.054140 0.047914 0.041875 0.037992 [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 7.73e-08 1.32e-07 1.70e-07 4.46e-07 5.02e-07 8.25e-07 erg/cm2
Error 2.07e-08 2.26e-08 3.96e-08 2.17e-07 9.53e-08 2.52e-07 erg/cm2
Peak flux Power-law 3.91e-02 3.65e-02 2.36e-02 2.36e-02 1.09e-01 1.23e-01 ph/cm2/s
Error 1.07e-02 6.37e-03 5.31e-03 1.06e-02 1.86e-02 2.08e-02 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 3.36e-02 4.10e-02 2.40e-02 1.04e-01 1.05e-01 0.00e+00 ph/cm2/s
Error 1.20e-02 8.43e-03 6.60e-03 1.93e-02 2.25e-02 0.00e+00 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 1.627 0.289 - - 8.40e-04 1.49e-04 52.150 57
CPL 0.472 1.496 59.0 -21.3 3.60e-03 1.81e-02 49.620 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 1.627 0.289 - - 8.40e-04 1.49e-04 52.150 57
CPL 0.472 1.496 59.0 -21.3 3.60e-03 1.81e-02 49.620 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
268.0546 -22.2994 0.0223 25.7 167.8 0.8541 8.6 TRIG_00373691
------------------------------------------
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: 1.62654 ( -0.286687 0.292006 )
Norm@50keV : 8.40471E-04 ( -0.000150423 0.000148559 )
------------------------------------------------------------
# Chi-Squared = 52.15 using 59 PHA bins.
# Reduced chi-squared = 0.9149 for 57 degrees of freedom
# Null hypothesis probability = 6.572207e-01
Photon flux (15-150 keV) in 64 sec: 0.108911 ( -0.0185917 0.0186462 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.01511e-07 ( -9.42227e-08 9.64563e-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: 0.471961 ( -1.76584 1.22666 )
Epeak [keV] : 58.9967 ( -16.4219 -58.9958 )
Norm@50keV : 3.60358E-03 ( -0.00360336 0.0325627 )
------------------------------------------------------------
# Chi-Squared = 49.62 using 59 PHA bins.
# Reduced chi-squared = 0.8860 for 56 degrees of freedom
# Null hypothesis probability = 7.136814e-01
Photon flux (15-150 keV) in 64 sec: 0.103582 ( -0.0192265 0.019425 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : 4.99556 ( -442.572 -432.572 )
beta : -2.17532 ( -0.655608 0.478867 )
Epeak [keV] : 32.9318 ( -5.92378 5.56941 )
Norm@50keV : 19.8545 ( -12.5774 182.981 )
------------------------------------------------------------
# Chi-Squared = 45.65 using 59 PHA bins.
# Reduced chi-squared = 0.8299 for 55 degrees of freedom
# Null hypothesis probability = 8.115458e-01
Photon flux (15-150 keV) in 64 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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62654 ( -0.286687 0.292006 )
Norm@50keV : 8.40471E-04 ( -0.000150423 0.000148559 )
------------------------------------------------------------
# Chi-Squared = 52.15 using 59 PHA bins.
# Reduced chi-squared = 0.9149 for 57 degrees of freedom
# Null hypothesis probability = 6.572207e-01
Photon flux (15-150 keV) in 64 sec: 0.108911 ( -0.0185917 0.0186462 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.01511e-07 ( -9.42227e-08 9.64563e-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: 0.471961 ( -1.76584 1.22666 )
Epeak [keV] : 58.9967 ( -16.4219 -58.9958 )
Norm@50keV : 3.60358E-03 ( -0.00360336 0.0325627 )
------------------------------------------------------------
# Chi-Squared = 49.62 using 59 PHA bins.
# Reduced chi-squared = 0.8860 for 56 degrees of freedom
# Null hypothesis probability = 7.136814e-01
Photon flux (15-150 keV) in 64 sec: 0.103582 ( -0.0192265 0.019425 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : 4.99556 ( -442.572 -432.572 )
beta : -2.17532 ( -0.655608 0.478867 )
Epeak [keV] : 32.9318 ( -5.92378 5.56941 )
Norm@50keV : 19.8545 ( -12.5774 182.981 )
------------------------------------------------------------
# Chi-Squared = 45.65 using 59 PHA bins.
# Reduced chi-squared = 0.8299 for 55 degrees of freedom
# Null hypothesis probability = 8.115458e-01
Photon flux (15-150 keV) in 64 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:
Tue May 31 17:09:53 EDT 2011