batgrbproduct Analysis for Trigger=337073
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 v2.42
Process Start Time (local time): Thu Dec 11 10:52:58 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger337073/GCN5_download_cron
======================================================================
Trigger: 00337073 Segment: 000
BAT Trigger Time: 250633177.536 [s; MET]
Trigger Stop: 250633179.584 [s; MET]
UTC: 2008-12-10T20:19:34.212340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 70.4580954461975 Dec: -11.2656778579067 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.2
Image Trigger?: NO
Rate S/N Ratio: 10.6770782520313 [ if not an image trigger ]
Image S/N Ratio: 8.2
Flight Position: [ source = BAT ]
RA: 70.4580954461975 Dec: -11.2656778579067 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 70.485290237157 Dec: -11.2627086134511 [deg; J2000]
{ 04h 41m 56.5s , -11d 15' 45.8" }
+/- 0.984901548716506 [arcmin] (estimated 90% radius based on SNR)
+/- 0.410828819551422 [arcmin] (formal 1-sigma fit error)
SNR: 31.0854535323072
Angular difference between Flight and Ground position is 1.610142 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 145.967999994755 +/- 7.38694739255561
Measured from: -8.82799991965294
to: 137.140000075102 [s; relative to TRIGTIME]
T50: 17.580000013113 +/- 2.82713988738385
Measured from: 1.40400007367134
to: 18.9840000867844 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 17.9679999947548
to: 18.9679999947548 [s; relative to TRIGTIME]
Total Fluence
Measured from: -12.8680000007153
to: 143.019999980927 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.811951 1.073776 0.796717 0.199196
0.064661 0.065908 0.063136 0.065999 [error]
Peak 0.080384 0.110324 0.101333 0.028487
0.006275 0.006814 0.006555 0.005782 [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 2.21e-07 4.27e-07 6.40e-07 2.07e-06 1.80e-06 3.35e-06 erg/cm2
Error 2.81e-08 3.13e-08 6.33e-08 4.59e-07 1.51e-07 5.05e-07 erg/cm2
Peak flux Power-law 6.99e-01 7.92e-01 6.42e-01 8.70e-01 2.45e+00 3.00e+00 ph/cm2/s
Error 8.59e-02 5.76e-02 5.38e-02 1.56e-01 1.62e-01 2.12e-01 ph/cm2/s
Fluence Cutoff-PL 2.21e-07 4.27e-07 6.40e-07 2.05e-06 1.80e-06 3.34e-06 erg/cm2
Error 2.81e-08 3.14e-08 6.34e-08 4.55e-07 1.51e-07 5.01e-07 erg/cm2
Peak flux Cutoff-PL 6.89e-01 7.94e-01 6.46e-01 8.16e-01 2.44e+00 2.94e+00 ph/cm2/s
Error 9.80e-02 6.05e-02 5.69e-02 2.72e-01 1.60e-01 3.22e-01 ph/cm2/s
Fluence Band 2.22e-07 4.26e-07 6.32e-07 2.05e-06 1.80e-06 3.30e-06 erg/cm2
Error 1.55e-08 2.97e-08 4.71e-08 4.55e-07 1.51e-07 2.30e-07 erg/cm2
Peak flux Band 6.83e-01 7.89e-01 6.43e-01 8.70e-01 2.45e+00 3.02e+00 ph/cm2/s
Error 5.12e-02 5.49e-02 4.60e-02 1.10e-01 1.60e-01 1.98e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.417 0.136 - - 1.20e-03 8.68e-05 53.641 57
CPL 1.342 0.300 426.9 0.0 1.30e-03 8.76e-05 53.910 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.301 0.122 - - 2.05e-02 1.37e-03 49.539 57
CPL 1.230 0.314 556.5 0.0 2.23e-02 1.37e-03 49.549 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: 28.160000 sec.
T50 in the 50-300 keV band: 19.072000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 155.888 -12.868 143.020
T90 145.968 -8.828 137.140
T50 17.580 1.404 18.984
Peak 1.000 17.968 18.968
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
70.4853 -11.2627 0.0062 14.5 28.7 2.2995 31.1 TRIG_00337073
------------------------------------------
Foreground time interval of the image:
-12.868 22.765 (delta_t = 35.633 [sec])
Background time interval of the image:
-94.435 -12.868 (delta_t = 81.567 [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 -12.868 sec. to 143.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41734 ( -0.135682 0.136721 )
Norm@50keV : 1.199196E-03 ( -8.714525E-05 8.647132E-05) )
------------------------------------------------------------
Chi-Squared = 53.64144 using 59 PHA bins.
Reduced chi-squared = 0.9410779 for 57 degrees of freedom
Null hypothesis probability = 0.602
Photon flux (15-150 keV) in 155.9 sec: 0.146625 ( -0.010324 0.010337 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80015e-06 ( -1.50085e-07 1.52236e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.868 sec. to 143.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34154 ( -0.384089 0.216887 )
Epeak [keV] : 426.901 ( )
Norm@50keV : 1.300566E-03 ( -9.303389E-05 8.222472E-05) )
------------------------------------------------------------
Chi-Squared = 53.90961 using 59 PHA bins.
Reduced chi-squared = 0.9626716 for 56 degrees of freedom
Null hypothesis probability = 0.554
Photon flux (15-150 keV) in 155.9 sec: 0.146562 ( -0.01032 0.010333 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80027e-06 ( -1.50288e-07 1.52096e-07 ) ergs/cm2
Band function
Time interval is from -12.868 sec. to 143.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12496 ( -8.87504 6.10433 )
beta : -1.41629 ( -8.58371 0.134799 )
Epeak [keV] : 43.5463 ( -43.4463 9956.45 )
Norm@50keV : 2.303211E-03 ( -2.303211E-03 0.248089 )
------------------------------------------------------------
Chi-Squared = 53.64375 using 59 PHA bins.
Reduced chi-squared = 0.9753409 for 55 degrees of freedom
Null hypothesis probability = 0.527
Photon flux (15-150 keV) in 155.9 sec: 0.222366 ( -0.089755 0.390861 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79707e-06 ( -1.50085e-07 1.52423e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 17.968 sec. to 18.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30134 ( -0.121358 0.121741 )
Norm@50keV : 2.053769E-02 ( -1.367996E-03 1.362566E-03) )
------------------------------------------------------------
Chi-Squared = 49.53868 using 59 PHA bins.
Reduced chi-squared = 0.8690996 for 57 degrees of freedom
Null hypothesis probability = 0.748
Photon flux (15-150 keV) in 1.000 sec: 2.45081 ( -0.16232 0.16247 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02875e-07 ( -1.5597e-08 1.5752e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.968 sec. to 18.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22962 ( -0.437917 0.190874 )
Epeak [keV] : 556.462 ( )
Norm@50keV : 2.227016E-02 ( -1.371892E-03 1.370762E-03) )
------------------------------------------------------------
Chi-Squared = 49.54878 using 59 PHA bins.
Reduced chi-squared = 0.8847997 for 56 degrees of freedom
Null hypothesis probability = 0.716
Photon flux (15-150 keV) in 1.000 sec: 2.44365 ( -0.15977 0.16055 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02887e-07 ( -1.559e-08 1.5769e-08 ) ergs/cm2
Band function
Time interval is from 17.968 sec. to 18.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.983998 ( -9.01600 3.44452 )
beta : -1.30206 ( -8.69794 0.121994 )
Epeak [keV] : 59.1015 ( -59.0015 9940.90 )
Norm@50keV : 3.873174E-02 ( -1.953907E-02 22212.8 )
------------------------------------------------------------
Chi-Squared = 49.53587 using 59 PHA bins.
Reduced chi-squared = 0.9006521 for 55 degrees of freedom
Null hypothesis probability = 0.683
Photon flux (15-150 keV) in 1.000 sec: 2.45080 ( -0.1605 0.16023 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02761e-07 ( -1.5611e-08 1.5734e-08 ) ergs/cm2
Plot creation:
Thu Dec 11 11:15:44 EST 2008