batgrbproduct Analysis for Trigger=331332
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): Sat Oct 11 12:02:05 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger331332/GCN5_download_cron
======================================================================
Trigger: 00331332 Segment: 000
BAT Trigger Time: 245377733.632 [s; MET]
Trigger Stop: 245377737.728 [s; MET]
UTC: 2008-10-11T00:28:50.466880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 220.360725648565 Dec: 33.6074738964866 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.49
Image Trigger?: NO
Rate S/N Ratio: 10.9087121146357 [ if not an image trigger ]
Image S/N Ratio: 7.49
Flight Position: [ source = BAT ]
RA: 220.360725648565 Dec: 33.6074738964866 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 220.363270796738 Dec: 33.5483477683147 [deg; J2000]
{ 14h 41m 27.2s , +33d 32' 54.1" }
+/- 2.26838649576108 [arcmin] (estimated 90% radius based on SNR)
+/- 1.00650263585072 [arcmin] (formal 1-sigma fit error)
SNR: 9.43954717381493
Angular difference between Flight and Ground position is 3.549848 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 9.05200001597404 +/- 2.38752844770979
Measured from: -0.283999919891357
to: 8.76800009608269 [s; relative to TRIGTIME]
T50: 3.91600000858307 +/- 1.59996500118899
Measured from: 1.78400009870529
to: 5.70000010728836 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.06000000238419
to: 2.06000000238419 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.912000000476837
to: 8.96000000834465 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.060394 0.112552 0.077386 -0.007014
0.014007 0.014294 0.013022 0.011847 [error]
Peak 0.014681 0.013610 0.019991 0.002850
0.004502 0.004633 0.004116 0.003891 [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 2.00e-08 3.76e-08 5.46e-08 1.69e-07 1.55e-07 2.88e-07 erg/cm2
Error 5.09e-09 6.11e-09 1.22e-08 7.99e-08 2.97e-08 9.08e-08 erg/cm2
Peak flux Power-law 8.36e-02 1.16e-01 1.18e-01 2.20e-01 3.88e-01 5.38e-01 ph/cm2/s
Error 4.63e-02 3.83e-02 3.26e-02 1.45e-01 1.01e-01 1.56e-01 ph/cm2/s
Fluence Cutoff-PL 1.82e-08 4.08e-08 5.57e-08 5.85e-08 1.45e-07 1.74e-07 erg/cm2
Error 5.78e-09 6.13e-09 1.38e-08 1.06e-07 3.32e-08 1.18e-07 erg/cm2
Peak flux Cutoff-PL 8.35e-02 1.16e-01 1.18e-01 2.19e-01 3.88e-01 5.23e-01 ph/cm2/s
Error 4.63e-02 3.83e-02 3.26e-02 1.44e-01 1.01e-01 1.56e-01 ph/cm2/s
Fluence Band 1.80e-08 4.16e-08 5.31e-08 1.25e-07 1.49e-07 2.42e-07 erg/cm2
Error 5.54e-09 8.23e-09 1.42e-08 1.11e-07 3.24e-08 1.15e-07 erg/cm2
Peak flux Band 8.17e-02 1.15e-01 1.18e-01 2.21e-01 3.89e-01 5.33e-01 ph/cm2/s
Error 2.83e-02 3.04e-02 3.03e-02 6.58e-02 9.77e-02 1.33e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.462 0.278 - - 1.64e-03 2.79e-04 62.491 57
CPL 0.754 1.139 82.4 4975.8 3.92e-03 1.06e-02 61.221 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.969 0.493 - - 3.37e-03 8.65e-04 60.581 57
CPL 0.857 0.000 552.9 0.0 3.74e-03 8.69e-04 60.643 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 9.872 -0.912 8.960
T90 9.052 -0.284 8.768
T50 3.916 1.784 5.700
Peak 1.000 1.060 2.060
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
220.3633 +33.5483 0.0204 7.8 -132.8 0.2648 9.4 TRIG_00331332
------------------------------------------
Foreground time interval of the image:
-0.912 8.960 (delta_t = 9.872 [sec])
Background time interval of the image:
-148.131 -0.912 (delta_t = 147.219 [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 -0.912 sec. to 8.960 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46168 ( -0.274523 0.281610 )
Norm@50keV : 1.644857E-03 ( -2.808966E-04 2.766864E-04) )
------------------------------------------------------------
Chi-Squared = 62.49105 using 59 PHA bins.
Reduced chi-squared = 1.096334 for 57 degrees of freedom
Null hypothesis probability = 0.288
Photon flux (15-150 keV) in 9.872 sec: 0.203301 ( -0.032446 0.032456 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55037e-07 ( -2.92438e-08 3.00829e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.912 sec. to 8.960 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.753862 ( -1.36762 0.909751 )
Epeak [keV] : 82.4233 ( -33.9417 9917.58 )
Norm@50keV : 3.919508E-03 ( -3.919508E-03 1.725575E-02) )
------------------------------------------------------------
Chi-Squared = 61.22140 using 59 PHA bins.
but latest trial 37.9200 gives Chi-Squared = 10.4500
Reduced chi-squared = 1.093239 for 56 degrees of freedom
Null hypothesis probability = 0.294
Photon flux (15-150 keV) in 9.872 sec: 0.197431 ( -0.033562 0.033597 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44606e-07 ( -3.25964e-08 3.38501e-08 ) ergs/cm2
Band function
Time interval is from -0.912 sec. to 8.960 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.757118 ( -9.24288 1.21716 )
beta : -9.15470 ( -8.26586 0.433781 )
Epeak [keV] : 82.5601 ( -47.8470 476.137 )
Norm@50keV : 3.904055E-03 ( -0.805781 19.8477 )
------------------------------------------------------------
Chi-Squared = 61.22132 using 59 PHA bins.
Reduced chi-squared = 1.113115 for 55 degrees of freedom
Null hypothesis probability = 0.263
Photon flux (15-150 keV) in 9.872 sec: 0.197417 ( -0.033544 0.033618 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49092e-07 ( -3.31916e-08 3.15608e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.060 sec. to 2.060 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.969044 ( -0.516828 0.469682 )
Norm@50keV : 3.373569E-03 ( -8.723391E-04 8.571437E-04) )
------------------------------------------------------------
Chi-Squared = 60.58128 using 59 PHA bins.
Reduced chi-squared = 1.062829 for 57 degrees of freedom
Null hypothesis probability = 0.348
Photon flux (15-150 keV) in 1.000 sec: 0.387863 ( -0.100388 0.101163 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.68911e-08 ( -1.01588e-08 1.03485e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.060 sec. to 2.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.856681 ( )
Epeak [keV] : 552.925 ( )
Norm@50keV : 3.743931E-03 ( -8.593032E-04 8.783389E-04) )
------------------------------------------------------------
Chi-Squared = 60.64340 using 59 PHA bins.
Reduced chi-squared = 1.082918 for 56 degrees of freedom
Null hypothesis probability = 0.312
Photon flux (15-150 keV) in 1.000 sec: 0.387712 ( -0.100339 0.101138 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.69139e-08 ( -1.01789e-08 1.03387e-08 ) ergs/cm2
Band function
Time interval is from 1.060 sec. to 2.060 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.850883 ( -9.14912 5.85088 )
beta : -0.969048 ( -9.03095 0.516839 )
Epeak [keV] : 37.4642 ( -37.3642 9962.54 )
Norm@50keV : 5.139756E-03 ( -5.139756E-03 205.457 )
------------------------------------------------------------
Chi-Squared = 60.58128 using 59 PHA bins.
Reduced chi-squared = 1.101478 for 55 degrees of freedom
Null hypothesis probability = 0.282
Photon flux (15-150 keV) in 1.000 sec: 0.388795 ( -0.097016 0.098454 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.69708e-08 ( -1.0148e-08 1.0367e-08 ) ergs/cm2
Plot creation:
Sat Oct 11 12:32:12 EDT 2008