batgrbproduct Analysis for Trigger=334112
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): Sun Nov 9 09:47:01 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger334112/SDC2
======================================================================
Trigger: 00334112 Segment: 000
BAT Trigger Time: 247906929.856 [s; MET]
Trigger Stop: 247906930.88 [s; MET]
UTC: 2008-11-09T07:02:06.614940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 330.787413462989 Dec: -54.7186309698602 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.1
Image Trigger?: NO
Rate S/N Ratio: 14.9331845230681 [ if not an image trigger ]
Image S/N Ratio: 9.1
Flight Position: [ source = BAT ]
RA: 330.787413462989 Dec: -54.7186309698602 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 330.797999911616 Dec: -54.711236771652 [deg; J2000]
{ 22h 03m 11.5s , -54d 42' 40.5" }
+/- 0.794984195236931 [arcmin] (estimated 90% radius based on SNR)
+/- 0.243419740080956 [arcmin] (formal 1-sigma fit error)
SNR: 42.2146689197544
Angular difference between Flight and Ground position is 0.575718 arcmin
Partial Coding Fraction: 0.734375 [ including projection effects ]
Duration
T90: 192 +/- 160
Measured from: -15.8560000061989
to: 176.143999993801 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: -15.8560000061989
to: 16.1439999938011 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.64399999380112
to: 8.64399999380112 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.8560000061989
to: 416.143999993801 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.044127 2.466677 1.518870 0.308670
0.096983 0.097471 0.086683 0.075429 [error]
Peak 0.620608 0.789714 0.531019 0.117643
0.024092 0.024751 0.021958 0.017675 [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 6.21e-07 9.96e-07 1.21e-06 2.86e-06 3.64e-06 5.68e-06 erg/cm2
Error 5.19e-08 4.96e-08 8.67e-08 4.41e-07 2.01e-07 5.10e-07 erg/cm2
Peak flux Power-law 3.84e-01 3.57e-01 2.31e-01 2.30e-01 1.07e+00 1.20e+00 ph/cm2/s
Error 2.73e-02 1.50e-02 1.18e-02 2.46e-02 4.35e-02 4.63e-02 ph/cm2/s
Fluence Cutoff-PL 4.87e-13 4.87e-13 4.87e-13 4.87e-13 4.87e-13 4.87e-13 erg/cm2
Error 2.16e+14 2.16e+14 2.16e+14 2.16e+14 2.16e+14 2.16e+14 erg/cm2
Peak flux Cutoff-PL 1.13e-02 1.13e-02 1.13e-02 1.13e-02 1.13e-02 1.13e-02 ph/cm2/s
Error 5.00e+23 5.00e+23 5.00e+23 5.00e+23 5.00e+23 5.00e+23 ph/cm2/s
Fluence Band 5.79e-07 1.03e-06 1.19e-06 2.47e-06 3.56e-06 5.28e-06 erg/cm2
Error 6.70e-08 6.92e-08 9.24e-08 9.42e-07 2.23e-07 8.86e-07 erg/cm2
Peak flux Band 3.62e-01 3.64e-01 2.36e-01 1.68e-01 1.05e+00 1.13e+00 ph/cm2/s
Error 3.45e-02 1.68e-02 1.30e-02 6.36e-02 4.75e-02 7.58e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.724 0.093 - - 9.13e-04 4.78e-05 52.556 57
CPL 1.358 0.325 83.9 0.0 1.41e-03 4.89e-04 52.239 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.631 0.073 - - 8.22e-03 3.27e-04 62.377 57
CPL 1.350 0.295 118.0 1631.1 1.13e-02 3.77e-03 59.550 0
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: 60.928000 sec.
T50 in the 50-300 keV band: 20.928000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 432.000 -15.856 416.144
T90 192.000 -15.856 176.144
T50 32.000 -15.856 16.144
Peak 1.000 7.644 8.644
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
330.7980 -54.7112 0.0046 20.3 -90.1 3.4449 42.2 TRIG_00334112
------------------------------------------
Foreground time interval of the image:
-15.856 16.949 (delta_t = 32.805 [sec])
Background time interval of the image:
-76.651 -15.856 (delta_t = 60.795 [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 -15.856 sec. to 416.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72389 ( -9.264421E-02 9.386122E-02) )
Norm@50keV : 9.125462E-04 ( -4.792976E-05 4.762522E-05) )
------------------------------------------------------------
Chi-Squared = 52.55619 using 59 PHA bins.
Reduced chi-squared = 0.9220384 for 57 degrees of freedom
Null hypothesis probability = 0.642
Photon flux (15-150 keV) in 432.0 sec: 0.122226 ( -0.006148 0.006159 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.64379e-06 ( -2.0015e-07 2.01122e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.856 sec. to 416.144 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.35766 ( -0.268266 0.381862 )
Epeak [keV] : 83.8676 ( )
Norm@50keV : 1.410468E-03 ( -2.595376E-04 7.190704E-04) )
------------------------------------------------------------
Chi-Squared = 52.23852 using 59 PHA bins.
but latest trial 1.91418 gives Chi-Squared = 11.2746
but latest trial 8.299572E-04 gives Chi-Squared = 9.01419
Reduced chi-squared = 0.9328307 for 56 degrees of freedom
Null hypothesis probability = 0.618
Photon flux (15-150 keV) in 432.0 sec: 1.126338E-03 ( -0.00112634 1e+24 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.86579e-13 ( -4.86579e-13 4.32e+14 ) ergs/cm2
Band function
Time interval is from -15.856 sec. to 416.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14520 ( -8.85480 1.83085 )
beta : -1.86088 ( -0.968323 0.180372 )
Epeak [keV] : 58.0504 ( -57.9504 9941.95 )
Norm@50keV : 1.972602E-03 ( -1.972602E-03 5.420458E-02) )
------------------------------------------------------------
Chi-Squared = 50.55258 using 59 PHA bins.
Reduced chi-squared = 0.9191378 for 55 degrees of freedom
Null hypothesis probability = 0.645
Photon flux (15-150 keV) in 432.0 sec: 0.119673 ( -0.00687 0.006794 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5592e-06 ( -2.25068e-07 2.21037e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.144 sec. to 16.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63103 ( -7.248926E-02 7.305872E-02) )
Norm@50keV : 8.218409E-03 ( -3.274847E-04 3.266251E-04) )
------------------------------------------------------------
Chi-Squared = 62.37739 using 59 PHA bins.
Reduced chi-squared = 1.094340 for 57 degrees of freedom
Null hypothesis probability = 0.291
Photon flux (15-150 keV) in 16.00 sec: 1.06651 ( -0.04344 0.04353 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22555e-06 ( -5.21184e-08 5.19584e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.144 sec. to 16.144 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34990 ( -0.305482 0.284171 )
Epeak [keV] : 118.009 ( -36.8986 3225.27 )
Norm@50keV : 1.129116E-02 ( -2.993855E-03 4.536749E-03) )
------------------------------------------------------------
Chi-Squared = 59.55036 using 59 PHA bins.
but latest trial 8.295029E-03 gives Chi-Squared = 2.87193
Reduced chi-squared = 1.063399 for 56 degrees of freedom
Null hypothesis probability = 0.348
Photon flux (15-150 keV) in 16.00 sec: 1.129116E-02 ( -0.0112912 1e+24 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80659e-13 ( -1.80659e-13 1.6e+13 ) ergs/cm2
Band function
Time interval is from 0.144 sec. to 16.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09616 ( -0.420683 1.03361 )
beta : -1.75553 ( -8.24447 0.140347 )
Epeak [keV] : 70.4494 ( -40.5481 9781.23 )
Norm@50keV : 1.625561E-02 ( -7.927706E-03 5.089046E-02) )
------------------------------------------------------------
Chi-Squared = 59.42703 using 59 PHA bins.
Reduced chi-squared = 1.080492 for 55 degrees of freedom
Null hypothesis probability = 0.318
Photon flux (15-150 keV) in 16.00 sec: 1.04673 ( -0.047449 0.04761 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19771e-06 ( -5.91952e-08 5.86064e-08 ) ergs/cm2
Plot creation:
Sun Nov 9 11:56:12 EST 2008