batgrbproduct Analysis for Trigger=344582
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): Sun Mar 1 17:12:59 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger344582/GCN5_download_cron
======================================================================
Trigger: 00344582 Segment: 000
BAT Trigger Time: 257583359.68 [s; MET]
Trigger Stop: 257583360.704 [s; MET]
UTC: 2009-03-01T06:55:55.141940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 338.14040286168 Dec: 26.6421673055728 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21.68
Image Trigger?: NO
Rate S/N Ratio: 95.3362470417207 [ if not an image trigger ]
Image S/N Ratio: 21.68
Flight Position: [ source = BAT ]
RA: 338.14040286168 Dec: 26.6421673055728 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 338.142475193166 Dec: 26.6386005751154 [deg; J2000]
{ 22h 32m 34.2s , +26d 38' 19.0" }
+/- 0.580782397819353 [arcmin] (estimated 90% radius based on SNR)
+/- 0.21745246322504 [arcmin] (formal 1-sigma fit error)
SNR: 66.1061750621525
Angular difference between Flight and Ground position is 0.241142 arcmin
Partial Coding Fraction: 0.3554688 [ including projection effects ]
Duration
T90: 41.4160000085831 +/- 2.16476879489307
Measured from: -1.77999991178513
to: 39.6360000967979 [s; relative to TRIGTIME]
T50: 19.9160000085831 +/- 0.212037715242639
Measured from: 5.17600008845329
to: 25.0920000970364 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 23.0679999887943
to: 24.0679999887943 [s; relative to TRIGTIME]
Total Fluence
Measured from: -16.9640000164509
to: 72.1559999883175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.930826 11.291275 10.913857 3.598742
0.097776 0.108430 0.106550 0.087742 [error]
Peak 0.472065 0.764111 0.756034 0.283351
0.017269 0.021487 0.022432 0.018220 [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 2.34e-06 5.03e-06 8.49e-06 3.28e-05 2.33e-05 4.64e-05 erg/cm2
Error 8.12e-08 1.03e-07 1.33e-07 1.23e-06 3.46e-07 0.00e+00 erg/cm2
Peak flux Power-law 4.70e+00 5.84e+00 5.27e+00 8.27e+00 1.87e+01 2.41e+01 ph/cm2/s
Error 3.20e-01 2.33e-01 1.89e-01 6.71e-01 6.19e-01 8.10e-01 ph/cm2/s
Fluence Cutoff-PL 2.22e-06 5.05e-06 8.66e-06 2.72e-05 2.32e-05 3.12e-05 erg/cm2
Error 1.15e-07 7.84e-08 1.73e-07 3.38e-06 3.57e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.69e+00 5.84e+00 5.28e+00 8.22e+00 1.86e+01 2.40e+01 ph/cm2/s
Error 3.19e-01 2.33e-01 1.90e-01 6.67e-01 6.18e-01 8.07e-01 ph/cm2/s
Fluence Band 2.20e-06 5.02e-06 8.64e-06 2.73e-05 2.32e-05 3.06e-05 erg/cm2
Error 1.14e-07 1.04e-07 1.73e-07 3.38e-06 3.59e-07 0.00e+00 erg/cm2
Peak flux Band 5.17e+01 6.43e+01 5.81e+01 9.11e+01 2.05e+02 2.43e+01 ph/cm2/s
Error 2.67e+02 2.52e+02 3.56e+02 4.99e+02 8.38e+02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.246 0.028 - - 2.61e-02 4.08e-04 43.699 57
CPL 1.076 0.117 343.3 328.8 3.05e-02 3.19e-03 37.386 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.146 0.060 - - 1.60e-01 5.07e-03 45.316 57
CPL 1.142 0.060 9987.7 5000.0 1.61e-01 5.09e-03 45.468 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: 35.712000 sec.
T50 in the 50-300 keV band: 19.648000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 89.120 -16.964 72.156
T90 41.416 -1.780 39.636
T50 19.916 5.176 25.092
Peak 1.000 23.068 24.068
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
338.1425 +26.6386 0.0029 35.3 -61.9 33.4190 66.1 TRIG_00344582
------------------------------------------
Foreground time interval of the image:
-16.964 60.221 (delta_t = 77.185 [sec])
Background time interval of the image:
-239.680 -16.964 (delta_t = 222.716 [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 -16.964 sec. to 72.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24582 ( -2.807772E-02 2.798426E-02) )
Norm@50keV : 2.611183E-02 ( -4.079845E-04 4.073083E-04) )
------------------------------------------------------------
Chi-Squared = 43.69949 using 59 PHA bins.
Reduced chi-squared = 0.7666577 for 57 degrees of freedom
Null hypothesis probability = 0.902
Photon flux (15-150 keV) in 89.12 sec: 3.08623 ( -0.05438 0.05456 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33153e-05 ( -3.46409e-07 3.46053e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -16.964 sec. to 72.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07605 ( -0.117964 0.115332 )
Epeak [keV] : 343.312 ( -113.393 544.186 )
Norm@50keV : 3.050601E-02 ( -2.998590E-03 3.389647E-03) )
------------------------------------------------------------
Chi-Squared = 37.38633 using 59 PHA bins.
Reduced chi-squared = 0.6676130 for 56 degrees of freedom
Null hypothesis probability = 0.974
Photon flux (15-150 keV) in 89.12 sec: 3.04456 ( -0.06047 0.06028 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31855e-05 ( -3.54163e-07 3.60312e-07 ) ergs/cm2
Band function
Time interval is from -16.964 sec. to 72.156 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.818781 ( -0.304779 0.829900 )
beta : -1.29958 ( -8.38078 0.366735 )
Epeak [keV] : 126.496 ( -289.398 545.735 )
Norm@50keV : 4.284529E-02 ( -2.993213E-03 3.406608E-03) )
------------------------------------------------------------
Chi-Squared = 37.57418 using 59 PHA bins.
Reduced chi-squared = 0.6831669 for 55 degrees of freedom
Null hypothesis probability = 0.965
Photon flux (15-150 keV) in 89.12 sec: 3.04437 ( -0.06032 0.06069 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31709e-05 ( -3.59599e-07 3.58797e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 23.068 sec. to 24.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14634 ( -6.007051E-02 5.989432E-02) )
Norm@50keV : 0.160020 ( -5.074292E-03 5.070880E-03) )
------------------------------------------------------------
Chi-Squared = 45.31596 using 59 PHA bins.
Reduced chi-squared = 0.7950169 for 57 degrees of freedom
Null hypothesis probability = 0.868
Photon flux (15-150 keV) in 1.000 sec: 18.6536 ( -0.6178 0.6193 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6491e-06 ( -5.7377e-08 5.7563e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 23.068 sec. to 24.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14153 ( -6.050301E-02 6.030905E-02) )
Epeak [keV] : 9987.66 ( -9987.66 12.3350 )
Norm@50keV : 0.160834 ( -5.093142E-03 5.091444E-03) )
------------------------------------------------------------
Chi-Squared = 45.46812 using 59 PHA bins.
Reduced chi-squared = 0.8119308 for 56 degrees of freedom
Null hypothesis probability = 0.842
Photon flux (15-150 keV) in 1.000 sec: 18.6458 ( -0.6176 0.6191 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64948e-06 ( -5.7437e-08 5.7572e-08 ) ergs/cm2
Band function
Time interval is from 23.068 sec. to 24.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.899838 ( -9.10016 5.89688 )
beta : -1.14633 ( -5.995166E-02 6.006467E-02) )
Epeak [keV] : 58.9403 ( -58.8403 9940.95 )
Norm@50keV : 0.284297 ( -0.129299 2.111085E+06) )
------------------------------------------------------------
Chi-Squared = 45.31601 using 59 PHA bins.
Reduced chi-squared = 0.8239275 for 55 degrees of freedom
Null hypothesis probability = 0.821
Photon flux (15-150 keV) in 1.000 sec: 205.391 ( -133.43 1542.57 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64819e-06 ( -5.7378e-08 5.7575e-08 ) ergs/cm2
Plot creation:
Sun Mar 1 17:26:14 EST 2009