batgrbproduct Analysis for Trigger=325268
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.41
Process Start Time (local time): Fri Sep 19 07:28:00 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger325268/GCN5_download_cron
======================================================================
Trigger: 00325268 Segment: 000
BAT Trigger Time: 243475516.16 [s; MET]
Trigger Stop: 243475516.672 [s; MET]
UTC: 2008-09-19T00:05:13.051580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 265.288933640242 Dec: -42.3961038809504 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.57
Image Trigger?: NO
Rate S/N Ratio: 26 [ if not an image trigger ]
Image S/N Ratio: 6.57
Flight Position: [ source = BAT ]
RA: 265.288933640242 Dec: -42.3961038809504 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 265.220700237057 Dec: -42.3748668847154 [deg; J2000]
{ 17h 40m 53.0s , -42d 22' 29.5" }
+/- 1.91984760732696 [arcmin] (estimated 90% radius based on SNR)
+/- 0.998542355148406 [arcmin] (formal 1-sigma fit error)
SNR: 11.9798556323725
Angular difference between Flight and Ground position is 3.281439 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 0.604000002145767 +/- 0.0804984370607107
Measured from: 0.116000086069107
to: 0.720000088214874 [s; relative to TRIGTIME]
T50: 0.336000025272369 +/- 0.0850411706287281
Measured from: 0.232000082731247
to: 0.568000108003616 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.078000009059906
to: 0.921999990940094 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0839999914169312
to: 0.759999990463257 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.021447 0.034601 0.035226 0.015367
0.004895 0.004753 0.004310 0.003727 [error]
Peak 0.021447 0.034601 0.035226 0.015367
0.004895 0.004753 0.004310 0.003727 [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 6.02e-09 1.42e-08 2.64e-08 1.19e-07 7.17e-08 1.66e-07 erg/cm2
Error 1.72e-09 2.33e-09 4.14e-09 4.54e-08 1.07e-08 4.73e-08 erg/cm2
Peak flux Power-law 2.84e-01 3.63e-01 3.40e-01 5.59e-01 1.18e+00 1.55e+00 ph/cm2/s
Error 8.25e-02 6.21e-02 5.14e-02 1.95e-01 1.64e-01 2.25e-01 ph/cm2/s
Fluence Cutoff-PL 5.99e-09 1.42e-08 2.65e-08 1.18e-07 7.17e-08 1.45e-07 erg/cm2
Error 1.72e-09 2.33e-09 4.14e-09 4.50e-08 1.07e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.83e-01 3.63e-01 3.40e-01 5.55e-01 1.18e+00 1.54e+00 ph/cm2/s
Error 8.25e-02 6.21e-02 5.15e-02 1.93e-01 1.64e-01 2.25e-01 ph/cm2/s
Fluence Band 5.92e-09 1.41e-08 2.64e-08 1.18e-07 7.17e-08 1.49e-07 erg/cm2
Error 1.71e-09 2.32e-09 4.13e-09 4.25e-08 1.07e-08 0.00e+00 erg/cm2
Peak flux Band 2.83e-01 3.64e-01 3.41e-01 5.62e-01 1.17e+00 1.55e+00 ph/cm2/s
Error 7.44e-02 6.62e-02 4.96e-02 1.92e-01 1.22e-01 2.43e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.097 0.258 - - 1.01e-02 1.37e-03 33.126 57
CPL 1.092 0.260 9998.3 2.6 1.02e-02 1.37e-03 33.143 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.097 0.258 - - 1.01e-02 1.37e-03 33.126 57
CPL 1.094 0.260 9999.2 5000.0 1.02e-02 1.37e-03 33.143 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: 0.640000 sec.
T50 in the 50-300 keV band: 0.320000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.676 0.084 0.760
T90 0.604 0.116 0.720
T50 0.336 0.232 0.568
Peak 1.000 -0.078 0.922
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
265.2207 -42.3749 0.0160 16.3 -177.4 0.1047 12.0 TRIG_00325268
------------------------------------------
Foreground time interval of the image:
0.084 0.760 (delta_t = 0.676 [sec])
Background time interval of the image:
-179.759 0.084 (delta_t = 179.843 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 0.084 sec. to 0.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09683 ( -0.263514 0.252675 )
Norm@50keV : 1.013740E-02 ( -1.367216E-03 1.363311E-03) )
------------------------------------------------------------
Chi-Squared = 33.12646 using 59 PHA bins.
Reduced chi-squared = 0.5811660 for 57 degrees of freedom
Null hypothesis probability = 0.995
Photon flux (15-150 keV) in 0.6760 sec: 1.17552 ( -0.16398 0.16475 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.16945e-08 ( -1.05774e-08 1.07484e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.084 sec. to 0.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09207 ( -0.265464 0.254345 )
Epeak [keV] : 9998.31 ( -3.60156 1.69043 )
Norm@50keV : 1.019178E-02 ( -1.372370E-03 1.369092E-03) )
------------------------------------------------------------
Chi-Squared = 33.14299 using 59 PHA bins.
Reduced chi-squared = 0.5918391 for 56 degrees of freedom
Null hypothesis probability = 0.994
Photon flux (15-150 keV) in 0.6760 sec: 1.17505 ( -0.16388 0.1647 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.17283e-08 ( -1.06075e-08 1.07153e-08 ) ergs/cm2
Band function
Time interval is from 0.084 sec. to 0.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.807601 ( -10.4350 4.56497 )
beta : -1.10225 ( -0.273427 0.268790 )
Epeak [keV] : 89.4387 ( -32.6415 9966.52 )
Norm@50keV : 1.732936E-02 ( -2.25638 969.850 )
------------------------------------------------------------
Chi-Squared = 33.10197 using 59 PHA bins.
Reduced chi-squared = 0.6018541 for 55 degrees of freedom
Null hypothesis probability = 0.992
Photon flux (15-150 keV) in 0.6760 sec: 1.17198 ( -0.15927 0.1691 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.16506e-08 ( -1.05783e-08 1.07457e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.3720 -4.1587 5.8111
R^2/D10^2 : 4.312926E-02 -0.0227398 0.0436085
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 49.49543 using 59 PHA bins.
Reduced chi-squared = 0.8683410 for 57 degrees of freedom
Null hypothesis probability = 0.750
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.497e-09 7.546e-10
25- 50 1.297e-08 2.951e-09
50-150 4.422e-08 1.193e-08
15-150 5.970e-08 1.290e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363
Norm : 4.86872 -4.86872 1e+24
------------------------------------------------------------
Chi-Squared = 42.91508 using 59 PHA bins.
Reduced chi-squared = 0.7528962 for 57 degrees of freedom
Null hypothesis probability = 0.917
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.192e-09 3.993e-09
25- 50 1.576e-08 8.058e-09
50-150 3.461e-08 1.790e-08
15-150 5.857e-08 2.881e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.78312 -2.98881 5.28828
R1^2/D10^2 : 0.774548 -0.609607 3.71407
kT2 [keV] : 43.8249 -17.4147 156.175
R2^2/D10^2 : 4.461023E-03 -0.00426472 1e+24
------------------------------------------------------------
Chi-Squared = 32.72783 using 59 PHA bins.
but latest trial 1.963037E-04 gives Chi-Squared = 2.86829
Reduced chi-squared = 0.5950515 for 55 degrees of freedom
Null hypothesis probability = 0.993
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.314e-09 2.801e-09
25- 50 1.426e-08 5.889e-09
50-150 5.430e-08 2.875e-08
15-150 7.487e-08 3.405e-08
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.084 sec. to 0.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09683 ( -0.263507 0.252682 )
Norm@50keV : 1.013740E-02 ( -1.367213E-03 1.363316E-03) )
------------------------------------------------------------
Chi-Squared = 33.12646 using 59 PHA bins.
Reduced chi-squared = 0.5811660 for 57 degrees of freedom
Null hypothesis probability = 0.995
Photon flux (15-150 keV) in 0.6760 sec: 1.17551 ( -0.16394 0.16476 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.17277e-08 ( -1.06096e-08 1.07072e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.084 sec. to 0.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09353 ( -0.266937 0.252920 )
Epeak [keV] : 9999.19 ( -9999.18 0.809570 )
Norm@50keV : 1.018700E-02 ( -1.367701E-03 1.373897E-03) )
------------------------------------------------------------
Chi-Squared = 33.14312 using 59 PHA bins.
Reduced chi-squared = 0.5918415 for 56 degrees of freedom
Null hypothesis probability = 0.994
Photon flux (15-150 keV) in 0.6760 sec: 1.17505 ( -0.16388 0.1647 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.17405e-08 ( -1.06141e-08 1.07072e-08 ) ergs/cm2
Band function
Time interval is from 0.084 sec. to 0.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.807606 ( -9.19239 5.65719 )
beta : -1.10225 ( -8.89775 0.267670 )
Epeak [keV] : 89.4395 ( -89.3395 9909.76 )
Norm@50keV : 1.732922E-02 ( -3.59117 966.784 )
------------------------------------------------------------
Chi-Squared = 33.10197 using 59 PHA bins.
Reduced chi-squared = 0.6018541 for 55 degrees of freedom
Null hypothesis probability = 0.992
Photon flux (15-150 keV) in 0.6760 sec: 1.17250 ( -0.15872 0.08627 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.1654e-08 ( -1.05816e-08 1.07477e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.3722 -4.1589 5.8109
R^2/D10^2 : 4.312804E-02 -0.0227386 0.0436097
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 49.49543 using 59 PHA bins.
Reduced chi-squared = 0.8683410 for 57 degrees of freedom
Null hypothesis probability = 0.750
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.497e-09 7.709e-10
25- 50 1.297e-08 3.196e-09
50-150 4.423e-08 1.189e-08
15-150 5.970e-08 1.403e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363
Norm : 4.86868 -4.86868 1e+24
------------------------------------------------------------
Chi-Squared = 42.91508 using 59 PHA bins.
Reduced chi-squared = 0.7528962 for 57 degrees of freedom
Null hypothesis probability = 0.917
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.192e-09 3.773e-09
25- 50 1.576e-08 7.694e-09
50-150 3.461e-08 1.722e-08
15-150 5.857e-08 2.994e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.77938 -2.98507 5.29852
R1^2/D10^2 : 0.775581 -0.610642 3.71303
kT2 [keV] : 43.7757 -17.3656 156.224
R2^2/D10^2 : 4.476469E-03 -0.00427618 1e+24
------------------------------------------------------------
Chi-Squared = 32.72785 using 59 PHA bins.
but latest trial 2.002865E-04 gives Chi-Squared = 2.54844
Reduced chi-squared = 0.5950518 for 55 degrees of freedom
Null hypothesis probability = 0.993
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.316e-09 2.754e-09
25- 50 1.426e-08 5.916e-09
50-150 5.432e-08 3.076e-08
15-150 7.489e-08 3.447e-08
Plot creation:
Fri Sep 19 08:04:24 EDT 2008