batgrbproduct Analysis for Trigger=100815
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 Jan 4 19:15:38 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger100815/GCN_download_cron
======================================================================
Trigger: 00100815 Segment: 000
BAT Trigger Time: 125786058.304 [s; MET]
Trigger Stop: 125786062.4 [s; MET]
UTC: 2004-12-26T20:34:18.976400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 79.7656401246817 Dec: 73.3212972392719 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6
Image Trigger?: NO
Rate S/N Ratio: 13.5646599662505 [ if not an image trigger ]
Image S/N Ratio: 6
Flight Position: [ source = BAT ]
RA: 79.7656401246817 Dec: 73.3212972392719 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 79.6874618521945 Dec: 73.3376001916431 [deg; J2000]
{ 05h 18m 45.0s , +73d 20' 15.4" }
+/- 3.29766236833098 [arcmin] (estimated 90% radius based on SNR)
+/- 2.04145465279576 [arcmin] (formal 1-sigma fit error)
SNR: 5.53125684267825
RA = 5h 18m 45.0s (79.687462 deg.)
Dec = 73d 20' 15" (73.337600 deg.)
Angular difference between Flight and Ground position is 1.663581 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 89.7119999974966 +/- 24.9702543066937
Measured from: 0.184000000357628
to: 89.8959999978542 [s; relative to TRIGTIME]
T50: 52.6719999909401 +/- 36.8094318305618
Measured from: 3.91200000047684
to: 56.5839999914169 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.30799999833107
to: 4.30799999833107 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.33600001037121
to: 93.33599999547 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.156537 0.216717 0.070770 0.121234
0.041302 0.040902 0.034843 0.029688 [error]
Peak 0.007765 0.016967 0.016030 0.006904
0.004338 0.004444 0.003939 0.003313 [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 3.88e-08 7.58e-08 1.15e-07 3.76e-07 3.22e-07 6.08e-07 erg/cm2
Error 1.57e-08 1.84e-08 3.41e-08 2.59e-07 8.30e-08 2.82e-07 erg/cm2
Peak flux Power-law 9.16e-02 1.11e-01 9.77e-02 1.47e-01 3.52e-01 4.48e-01 ph/cm2/s
Error 4.65e-02 3.53e-02 3.04e-02 9.83e-02 9.80e-02 1.29e-01 ph/cm2/s
Fluence Cutoff-PL 3.89e-08 7.59e-08 1.15e-07 3.73e-07 3.22e-07 5.97e-07 erg/cm2
Error 1.57e-08 1.84e-08 3.42e-08 2.57e-07 8.31e-08 2.80e-07 erg/cm2
Peak flux Cutoff-PL 7.37e-02 1.23e-01 1.07e-01 5.00e-02 3.37e-01 3.53e-01 ph/cm2/s
Error 5.34e-02 4.43e-02 3.76e-02 1.02e-01 1.01e-01 1.56e-01 ph/cm2/s
Fluence Band 3.92e-08 7.55e-08 1.15e-07 3.77e-07 3.24e-07 5.91e-07 erg/cm2
Error 1.19e-08 1.77e-08 2.57e-08 3.35e-07 7.70e-08 3.01e-07 erg/cm2
Peak flux Band 7.37e-02 1.23e-01 1.07e-01 4.99e-02 3.37e-01 3.53e-01 ph/cm2/s
Error 5.35e-02 3.29e-02 3.70e-02 1.18e-01 1.01e-01 1.56e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.403 0.425 - - 3.52e-04 8.06e-05 85.712 57
CPL 1.361 1.983 734.1 0.0 3.70e-04 8.11e-05 85.786 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.187 0.471 - - 3.00e-03 8.15e-04 72.854 57
CPL 0.045 2.272 87.5 4976.3 1.10e-02 1.38e-01 71.836 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: 5.120000 sec.
T50 in the 50-300 keV band: 2.752000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 94.672 -1.336 93.336
T90 89.712 0.184 89.896
T50 52.672 3.912 56.584
Peak 1.000 3.308 4.308
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
79.6875 +73.3376 0.0346 11.9 144.2 0.4661 5.5 TRIG_00100815
------------------------------------------
Foreground time interval of the image:
-1.336 93.336 (delta_t = 94.672 [sec])
Background time interval of the image:
-299.304 -1.336 (delta_t = 297.968 [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 -1.336 sec. to 93.336 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40338 ( -0.432008 0.417271 )
Norm@50keV : 3.523274E-04 ( -8.113161E-05 8.006167E-05) )
------------------------------------------------------------
Chi-Squared = 85.71162 using 59 PHA bins.
Reduced chi-squared = 1.503713 for 57 degrees of freedom
Null hypothesis probability = 8.272E-03
Photon flux (15-150 keV) in 94.67 sec: 4.293959E-02 ( -0.00982949 0.00985655 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.22088e-07 ( -8.1971e-08 8.41171e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.336 sec. to 93.336 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36131 ( -1.73290 2.23239 )
Epeak [keV] : 734.062 ( )
Norm@50keV : 3.698860E-04 ( -8.257595E-05 7.971487E-05) )
------------------------------------------------------------
Chi-Squared = 85.78554 using 59 PHA bins.
Reduced chi-squared = 1.531885 for 56 degrees of freedom
Null hypothesis probability = 6.388E-03
Photon flux (15-150 keV) in 94.67 sec: 4.292730E-02 ( -0.00982683 0.00985357 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.22101e-07 ( -8.20316e-08 8.40906e-08 ) ergs/cm2
Band function
Time interval is from -1.336 sec. to 93.336 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.918383 ( -14.4071 0.592905 )
beta : -1.54470 ( -0.788789 0.425834 )
Epeak [keV] : 84.0195 ( -29.5981 373.917 )
Norm@50keV : 6.962497E-04 ( -4.65201 10.8751 )
------------------------------------------------------------
Chi-Squared = 85.43819 using 59 PHA bins.
Reduced chi-squared = 1.553422 for 55 degrees of freedom
Null hypothesis probability = 5.330E-03
Photon flux (15-150 keV) in 94.67 sec: 4.280787E-02 ( -0.00973603 0.00981025 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.23805e-07 ( -7.63163e-08 7.75906e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.304 sec. to 4.312 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18684 ( -0.482905 0.458767 )
Norm@50keV : 3.004013E-03 ( -8.150155E-04 8.150062E-04) )
------------------------------------------------------------
Chi-Squared = 72.85444 using 59 PHA bins.
Reduced chi-squared = 1.278148 for 57 degrees of freedom
Null hypothesis probability = 7.677E-02
Photon flux (15-150 keV) in 1.008 sec: 0.351975 ( -0.097724 0.098288 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08402e-08 ( -9.12895e-09 9.35011e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.304 sec. to 4.312 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.488839E-02 ( -3.04489 1.49993 )
Epeak [keV] : 87.5383 ( -40.1184 9912.46 )
Norm@50keV : 1.102195E-02 ( -1.102195E-02 0.264841 )
------------------------------------------------------------
Chi-Squared = 71.83588 using 59 PHA bins.
but latest trial 38.8745 gives Chi-Squared = 7.74988
Reduced chi-squared = 1.282784 for 56 degrees of freedom
Null hypothesis probability = 7.543E-02
Photon flux (15-150 keV) in 1.008 sec: 0.337446 ( -0.101543 0.101323 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.83117e-08 ( -1.00885e-08 1.04365e-08 ) ergs/cm2
Band function
Time interval is from 3.304 sec. to 4.312 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.236709E-02 ( -9.96763 2.23336 )
beta : -7.86291 ( -2.13709 17.8628 )
Epeak [keV] : 87.2332 ( -87.1332 9912.77 )
Norm@50keV : 1.115817E-02 ( -1.115817E-02 1.520328E-02) )
------------------------------------------------------------
Chi-Squared = 71.83587 using 59 PHA bins.
Reduced chi-squared = 1.306107 for 55 degrees of freedom
Null hypothesis probability = 6.328E-02
Photon flux (15-150 keV) in 1.008 sec: 0.337385 ( -0.101319 0.101629 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.95198e-08 ( -1.06179e-08 9.24205e-09 ) ergs/cm2
Plot creation:
Fri Jan 4 19:27:18 EST 2008