batgrbproduct Analysis for Trigger=339854
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): Fri Jun 3 16:35:09 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger339854/SDC
======================================================================
Trigger: 00339854 Segment: 000
BAT Trigger Time: 253566472 [s; MET]
Trigger Stop: 253566536 [s; MET]
UTC: 2009-01-13T19:07:47.586500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 170.230581945326 Dec: -61.915008038308 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 18.81
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 18.81
Flight Position: [ source = BAT ]
RA: 170.230581945326 Dec: -61.915008038308 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.329305228379 Dec: -61.9241571184376 [deg; J2000]
{ 11h 21m 19.0s , -61d 55' 27.0" }
+/- 3.92198452168298 [arcmin] (estimated 90% radius based on SNR)
+/- 2.22649579612619 [arcmin] (formal 1-sigma fit error)
SNR: 4.31770377893695
Angular difference between Flight and Ground position is 2.841729 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 320.463999986649 +/- 219.842711523868
Measured from: -1.46399998664856
to: 319 [s; relative to TRIGTIME]
T50: 168.539999991655 +/- 278.679073253192
Measured from: 54.472000002861
to: 223.011999994516 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 149.243999987841
to: 150.243999987841 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.99599999189377
to: 526.747999995947 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.322636 3.259165 0.024864 0.073635
0.106055 0.101999 0.085888 0.073193 [error]
Peak 0.027697 0.020151 0.008898 0.005094
0.005265 0.005051 0.004266 0.003627 [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 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 Power-law 2.23e-01 1.54e-01 6.93e-02 4.34e-02 4.68e-01 4.90e-01 ph/cm2/s
Error 7.28e-02 3.95e-02 3.27e-02 3.91e-02 1.15e-01 1.24e-01 ph/cm2/s
Fluence Cutoff-PL 1.52e-06 1.31e-06 7.24e-08 3.33e-11 2.89e-06 2.89e-06 erg/cm2
Error 1.36e-07 7.50e-08 2.88e-08 8.65e-11 1.64e-07 1.64e-07 erg/cm2
Peak flux Cutoff-PL 2.22e-01 1.56e-01 6.88e-02 3.52e-02 4.66e-01 4.82e-01 ph/cm2/s
Error 7.65e-02 4.86e-02 5.16e-02 1.17e-01 1.30e-01 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 3.391 0.000 - - 5.81e-04 0.00e+00 178.290 57
CPL 1.000 0.000 50.0 0.0 2.53e-03 0.00e+00 705.690 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 2.149 0.512 - - 2.90e-03 1.04e-03 53.510 57
CPL 1.919 0.000 14.3 0.0 3.98e-03 0.00e+00 53.510 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 532.744 -5.996 526.748
T90 320.464 -1.464 319.000
T50 168.540 54.472 223.012
Peak 1.000 149.244 150.244
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
170.3293 -61.9242 0.0445 0.1 -113.2 1.4278 4.3 TRIG_00339854
------------------------------------------
Foreground time interval of the image:
-5.996 363.069 (delta_t = 369.065 [sec])
481.000 526.748 (delta_t = 45.748 [sec])
Background time interval of the image:
-179.000 -5.996 (delta_t = 173.004 [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
Multiple GTIs in the spectrum
tstart tstop
-5.996000 363.069100
481.000000 526.748000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.39110 ( )
Norm@50keV : 5.81222E-04 ( )
------------------------------------------------------------
# Chi-Squared = 178.29 using 59 PHA bins.
# Reduced chi-squared = 3.1279 for 57 degrees of freedom
# Null hypothesis probability = 2.046345e-14
Photon flux (15-150 keV) in 414.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-5.996000 363.069100
481.000000 526.748000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.53081E-03 ( )
------------------------------------------------------------
# Chi-Squared = 705.69 using 59 PHA bins.
# Reduced chi-squared = 12.602 for 56 degrees of freedom
# Null hypothesis probability = 3.496527e-113
Photon flux (15-150 keV) in 414.8 sec: 0.181092 ( -0.01176 0.011809 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89406e-06 ( -1.63012e-07 1.64215e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-5.996000 363.069100
481.000000 526.748000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.49180 ( -0.790495 1.91419 )
beta : -9.99236 ( 421.651 431.651 )
Epeak [keV] : 22.6374 ( -1.45159 1.95844 )
Norm@50keV : 6.09239 ( -5.85678 42.3022 )
------------------------------------------------------------
# Chi-Squared = 51.59 using 59 PHA bins.
# Reduced chi-squared = 0.9380 for 55 degrees of freedom
# Null hypothesis probability = 6.057787e-01
Photon flux (15-150 keV) in 414.8 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 149.244 sec. to 150.244 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14885 ( -0.466014 0.557733 )
Norm@50keV : 2.90053E-03 ( -0.00107342 0.00101579 )
------------------------------------------------------------
# Chi-Squared = 53.51 using 59 PHA bins.
# Reduced chi-squared = 0.9388 for 57 degrees of freedom
# Null hypothesis probability = 6.068206e-01
Photon flux (15-150 keV) in 1 sec: 0.467647 ( -0.115176 0.115194 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.7091e-08 ( -8.35723e-09 8.90884e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 149.244 sec. to 150.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91908 ( )
Epeak [keV] : 14.2897 ( )
Norm@50keV : 3.97869E-03 ( )
------------------------------------------------------------
# Chi-Squared = 53.51 using 59 PHA bins.
# Reduced chi-squared = 0.9555 for 56 degrees of freedom
# Null hypothesis probability = 5.698574e-01
Photon flux (15-150 keV) in 1 sec: 0.466007 ( -0.116996 0.116315 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 149.244 sec. to 150.244 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.93513 ( 1.93513 1.93513 )
beta : -2.41686 ( 2.3992 10.8766 )
Epeak [keV] : 12.4325 ( -12.4256 -12.4256 )
Norm@50keV : 3.88812E-03 ( -0.00149119 0.0902658 )
------------------------------------------------------------
# Chi-Squared = 53.49 using 59 PHA bins.
# Reduced chi-squared = 0.9726 for 55 degrees of freedom
# Null hypothesis probability = 5.324039e-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:
Fri Jun 3 16:42:49 EDT 2011