batgrbproduct Analysis for Trigger=238108
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): Wed Jan 2 11:20:43 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger238108/GCN5_download_cron
======================================================================
Trigger: 00238108 Segment: 000
BAT Trigger Time: 184852042.88 [s; MET]
Trigger Stop: 184852044.928 [s; MET]
UTC: 2006-11-10T11:47:21.318140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 336.30368447156 Dec: -2.26672228601831 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.33
Image Trigger?: NO
Rate S/N Ratio: 8 [ if not an image trigger ]
Image S/N Ratio: 7.33
Flight Position: [ source = BAT ]
RA: 336.30368447156 Dec: -2.26672228601831 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 336.286351548792 Dec: -2.25807764720602 [deg; J2000]
{ 22h 25m 08.7s , -02d 15' 29.1" }
+/- 1.1502705818452 [arcmin] (estimated 90% radius based on SNR)
+/- 0.419450518823472 [arcmin] (formal 1-sigma fit error)
SNR: 24.9035476255895
RA = 22h 25m 8.7s (336.286352 deg.)
Dec = -2d 15' 29" (-2.258078 deg.)
Angular difference between Flight and Ground position is 1.161417 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 40.744000017643 +/- 4.02450144817196
Measured from: -6.24000000953674
to: 34.5040000081062 [s; relative to TRIGTIME]
T50: 19.972000002861 +/- 2.82510530180052
Measured from: 0.724000006914139
to: 20.6960000097752 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.74400001764297
to: 10.744000017643 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.7960000038147
to: 38.5 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.629453 0.684768 0.462086 0.083501
0.034409 0.035303 0.033217 0.033837 [error]
Peak 0.027522 0.022394 0.018770 0.004458
0.005101 0.005333 0.004966 0.004895 [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 1.71e-07 2.84e-07 3.57e-07 8.97e-07 1.06e-06 1.71e-06 erg/cm2
Error 1.84e-08 1.75e-08 3.33e-08 1.84e-07 7.58e-08 2.09e-07 erg/cm2
Peak flux Power-law 1.96e-01 1.79e-01 1.13e-01 1.09e-01 5.34e-01 5.98e-01 ph/cm2/s
Error 7.11e-02 4.09e-02 4.18e-02 8.39e-02 1.21e-01 1.46e-01 ph/cm2/s
Fluence Cutoff-PL 1.71e-07 2.84e-07 3.58e-07 8.90e-07 1.06e-06 1.71e-06 erg/cm2
Error 1.84e-08 1.75e-08 3.34e-08 1.83e-07 7.58e-08 2.08e-07 erg/cm2
Peak flux Cutoff-PL 1.96e-01 1.79e-01 1.13e-01 1.09e-01 5.34e-01 5.97e-01 ph/cm2/s
Error 5.22e-02 4.09e-02 4.19e-02 8.34e-02 1.21e-01 1.43e-01 ph/cm2/s
Fluence Band 1.71e-07 2.85e-07 3.60e-07 9.03e-07 1.07e-06 1.75e-06 erg/cm2
Error 1.35e-08 2.69e-08 3.70e-08 2.61e-07 9.54e-08 3.61e-07 erg/cm2
Peak flux Band 1.96e-01 1.79e-01 1.13e-01 1.09e-01 5.34e-01 5.97e-01 ph/cm2/s
Error 7.11e-02 4.21e-02 4.19e-02 1.06e-01 1.21e-01 1.45e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.668 0.124 - - 2.42e-03 1.59e-04 40.251 57
CPL 1.609 0.414 322.5 0.0 2.57e-03 1.60e-04 40.423 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.663 0.468 - - 4.07e-03 1.12e-03 62.763 57
CPL 1.614 0.000 325.1 0.0 4.36e-03 8.85e-03 62.842 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: 37.952000 sec.
T50 in the 50-300 keV band: 18.816000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 47.296 -8.796 38.500
T90 40.744 -6.240 34.504
T50 19.972 0.724 20.696
Peak 1.000 9.744 10.744
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
336.2864 -2.2581 0.0078 6.3 43.8 1.6040 24.9 TRIG_00238108
------------------------------------------
Foreground time interval of the image:
-8.796 28.021 (delta_t = 36.817 [sec])
Background time interval of the image:
-239.880 -8.796 (delta_t = 231.084 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -8.796 sec. to 38.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66769 ( -0.123163 0.124881 )
Norm@50keV : 2.420261E-03 ( -1.601691E-04 1.585030E-04) )
------------------------------------------------------------
Chi-Squared = 40.25061 using 59 PHA bins.
Reduced chi-squared = 0.7061511 for 57 degrees of freedom
Null hypothesis probability = 0.955
Photon flux (15-150 keV) in 47.30 sec: 0.317894 ( -0.019622 0.019676 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06287e-06 ( -7.52685e-08 7.62381e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.796 sec. to 38.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60934 ( -0.379156 0.449233 )
Epeak [keV] : 322.514 ( )
Norm@50keV : 2.573584E-03 ( -1.559611E-04 1.647966E-04) )
------------------------------------------------------------
Chi-Squared = 40.42267 using 59 PHA bins.
Reduced chi-squared = 0.7218334 for 56 degrees of freedom
Null hypothesis probability = 0.942
Photon flux (15-150 keV) in 47.30 sec: 0.317751 ( -0.019613 0.019667 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06282e-06 ( -7.5259e-08 7.62712e-08 ) ergs/cm2
Band function
Time interval is from -8.796 sec. to 38.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.40001 ( -8.59999 6.40001 )
beta : -1.66768 ( -0.124942 0.123132 )
Epeak [keV] : 18.7315 ( -18.6315 9981.27 )
Norm@50keV : 5.105969E-03 ( -5.105969E-03 0.304744 )
------------------------------------------------------------
Chi-Squared = 40.25063 using 59 PHA bins.
Reduced chi-squared = 0.7318296 for 55 degrees of freedom
Null hypothesis probability = 0.932
Photon flux (15-150 keV) in 47.30 sec: 0.317907 ( -0.019299 0.019076 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06956e-06 ( -7.1073e-08 1.19636e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 9.744 sec. to 10.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66292 ( -0.450201 0.485043 )
Norm@50keV : 4.073055E-03 ( -1.159049E-03 1.081258E-03) )
------------------------------------------------------------
Chi-Squared = 62.76345 using 59 PHA bins.
Reduced chi-squared = 1.101113 for 57 degrees of freedom
Null hypothesis probability = 0.279
Photon flux (15-150 keV) in 1.000 sec: 0.534130 ( -0.121431 0.12143 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.78276e-08 ( -1.09411e-08 1.15641e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.744 sec. to 10.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61391 ( )
Epeak [keV] : 325.103 ( )
Norm@50keV : 4.357510E-03 ( -1.011062E-03 1.669361E-02) )
------------------------------------------------------------
Chi-Squared = 62.84234 using 59 PHA bins.
Reduced chi-squared = 1.122185 for 56 degrees of freedom
Null hypothesis probability = 0.247
Photon flux (15-150 keV) in 1.000 sec: 0.533937 ( -0.121394 0.121393 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.78268e-08 ( -1.09459e-08 1.15628e-08 ) ergs/cm2
Band function
Time interval is from 9.744 sec. to 10.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25315 ( -8.74685 3.93797 )
beta : -1.66748 ( -8.33252 0.453843 )
Epeak [keV] : 32.5497 ( -32.4497 9967.45 )
Norm@50keV : 9.392577E-03 ( -9.392576E-03 0.670472 )
------------------------------------------------------------
Chi-Squared = 62.75396 using 59 PHA bins.
Reduced chi-squared = 1.140981 for 55 degrees of freedom
Null hypothesis probability = 0.221
Photon flux (15-150 keV) in 1.000 sec: 0.533936 ( -0.121392 0.121394 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.76209e-08 ( -1.05708e-08 1.15725e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 11:37:12 EST 2008