batgrbproduct Analysis for Trigger=453747
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 May 21 09:35:09 EDT 2011
Host Name: gcn5
Current Working Dir: /Home/eud/batgroup/grb_auto_proc_temp/trigger453747
======================================================================
Trigger: 00453747 Segment: 000
BAT Trigger Time: 327616135.168 [s; MET]
Trigger Stop: 327616137.216 [s; MET]
UTC: 2011-05-20T20:28:48.193920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 134.375117604516 Dec: 56.401895388955 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.87
Image Trigger?: NO
Rate S/N Ratio: 15.9059737205869 [ if not an image trigger ]
Image S/N Ratio: 7.87
Flight Position: [ source = BAT ]
RA: 134.375117604516 Dec: 56.401895388955 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 134.36295513383 Dec: 56.4180302725439 [deg; J2000]
{ 08h 57m 27.1s , +56d 25' 04.9" }
+/- 1.10897259170223 [arcmin] (estimated 90% radius based on SNR)
+/- 0.315192398758785 [arcmin] (formal 1-sigma fit error)
SNR: 26.2389100333325
Angular difference between Flight and Ground position is 1.048905 arcmin
Partial Coding Fraction: 0.6953125 [ including projection effects ]
Duration
T90: 15.6799999475479 +/- 1.80279781551004
Measured from: -0.279999971389771
to: 15.3999999761581 [s; relative to TRIGTIME]
T50: 7.23599994182587 +/- 0.882806864520696
Measured from: 2.432000041008
to: 9.66799998283386 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.15200001001358
to: 5.15200001001358 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.21999996900558
to: 16.6400000452995 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.284627 0.547103 0.522720 0.126729
0.030069 0.031155 0.028296 0.023994 [error]
Peak 0.032805 0.046010 0.046160 0.009821
0.007097 0.007530 0.006997 0.005838 [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 9.35e-08 2.15e-07 3.92e-07 1.70e-06 1.07e-06 2.41e-06 erg/cm2
Error 1.13e-08 1.56e-08 2.67e-08 2.62e-07 6.90e-08 2.76e-07 erg/cm2
Peak flux Power-law 2.80e-01 3.40e-01 2.99e-01 4.51e-01 1.08e+00 1.37e+00 ph/cm2/s
Error 8.60e-02 6.42e-02 5.47e-02 1.75e-01 1.77e-01 2.32e-01 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 2.60e-01 3.50e-01 3.11e-01 3.09e-01 1.06e+00 1.23e+00 ph/cm2/s
Error 1.02e-01 7.22e-02 6.50e-02 3.14e-01 1.82e-01 3.22e-01 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 1.133 0.105 - - 5.77e-03 3.50e-04 52.480 57
CPL 0.651 0.444 156.0 295.5 9.60e-03 4.60e-03 48.590 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 1.187 0.276 - - 9.19e-03 1.47e-03 49.310 57
CPL 0.833 0.921 178.1 0.0 1.35e-02 2.16e-02 48.960 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: 15.168000 sec.
T50 in the 50-300 keV band: 7.104000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 17.860 -1.220 16.640
T90 15.680 -0.280 15.400
T50 7.236 2.432 9.668
Peak 1.000 4.152 5.152
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
134.3630 +56.4180 0.0074 30.1 14.8 1.5457 26.2 TRIG_00453747
------------------------------------------
Foreground time interval of the image:
-1.220 16.640 (delta_t = 17.860 [sec])
Background time interval of the image:
-239.168 -1.220 (delta_t = 237.948 [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 -1.220 sec. to 16.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13342 ( -0.105376 0.103736 )
Norm@50keV : 5.77459E-03 ( -0.000349696 0.000349324 )
------------------------------------------------------------
# Chi-Squared = 52.48 using 59 PHA bins.
# Reduced chi-squared = 0.9208 for 57 degrees of freedom
# Null hypothesis probability = 6.450053e-01
Photon flux (15-150 keV) in 17.86 sec: 0.672147 ( -0.0423746 0.0424646 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06707e-06 ( -6.88696e-08 6.90857e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.220 sec. to 16.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.651019 ( -0.468149 0.420268 )
Epeak [keV] : 156.006 ( -50.7131 540.279 )
Norm@50keV : 9.60387E-03 ( -0.00336854 0.00582817 )
------------------------------------------------------------
# Chi-Squared = 48.59 using 59 PHA bins.
# Reduced chi-squared = 0.8677 for 56 degrees of freedom
# Null hypothesis probability = 7.484657e-01
Photon flux (15-150 keV) in 17.86 sec: 0.658217 ( -0.044098 0.044119 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -1.220 sec. to 16.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.153641 ( -0.909005 0.0703045 )
beta : -1.32061 ( -0.572426 0.198727 )
Epeak [keV] : 68.0608 ( -39.4393 175.741 )
Norm@50keV : 3.03144E-02 ( -0.0313671 67.5029 )
------------------------------------------------------------
# Chi-Squared = 47.59 using 59 PHA bins.
# Reduced chi-squared = 0.8653 for 55 degrees of freedom
# Null hypothesis probability = 7.506917e-01
Photon flux (15-150 keV) in 17.86 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 4.152 sec. to 5.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18692 ( -0.279709 0.272993 )
Norm@50keV : 9.19254E-03 ( -0.00146951 0.00146928 )
------------------------------------------------------------
# Chi-Squared = 49.31 using 59 PHA bins.
# Reduced chi-squared = 0.8651 for 57 degrees of freedom
# Null hypothesis probability = 7.555691e-01
Photon flux (15-150 keV) in 1 sec: 1.07707 ( -0.177187 0.177706 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.36117e-08 ( -1.64277e-08 1.65947e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.152 sec. to 5.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.833414 ( -1.25918 0.583048 )
Epeak [keV] : 178.080 ( -178.087 -178.087 )
Norm@50keV : 1.35493E-02 ( -0.00566323 0.0375345 )
------------------------------------------------------------
# Chi-Squared = 48.96 using 59 PHA bins.
# Reduced chi-squared = 0.8744 for 56 degrees of freedom
# Null hypothesis probability = 7.360265e-01
Photon flux (15-150 keV) in 1 sec: 1.06310 ( -0.182111 0.18202 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.17658e-08 ( -1.77619e-08 1.74812e-08 ) ergs/cm2
Band function
Time interval is from 4.152 sec. to 5.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95368 ( -43.2219 -43.2219 )
beta : -1.26357 ( -0.328325 0.310549 )
Epeak [keV] : 26.0549 ( -26.0531 12.197 )
Norm@50keV : 548.108 ( -545.367 394.619 )
------------------------------------------------------------
# Chi-Squared = 48.23 using 59 PHA bins.
# Reduced chi-squared = 0.8770 for 55 degrees of freedom
# Null hypothesis probability = 7.288958e-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] : ( )
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 May 21 11:41:59 EDT 2011