batgrbproduct Analysis for Trigger=349592
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 v2.44
Process Start Time (local time): Sun Apr 19 23:27:22 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger349592/GCN5_download_cron
======================================================================
Trigger: 00349592 Segment: 000
BAT Trigger Time: 261841416 [s; MET]
Trigger Stop: 261841480 [s; MET]
UTC: 2009-04-19T13:43:31.327920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 196.975889867574 Dec: -75.6086233726775 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.88
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.88
Flight Position: [ source = BAT ]
RA: 196.975889867574 Dec: -75.6086233726775 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 197.006476865748 Dec: -75.6163562024024 [deg; J2000]
{ 13h 08m 01.6s , -75d 36' 58.9" }
+/- 2.080855063143 [arcmin] (estimated 90% radius based on SNR)
+/- 0.861020399815519 [arcmin] (formal 1-sigma fit error)
SNR: 10.6779330138842
Angular difference between Flight and Ground position is 0.650550 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 468.319999992847 +/- 47.0706364985477
Measured from: 25.944000095129
to: 494.264000087976 [s; relative to TRIGTIME]
T50: 307.244000017643 +/- 62.1287928054088
Measured from: 64.2040000855923
to: 371.448000103235 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 37.1800000071526
to: 38.1800000071526 [s; relative to TRIGTIME]
Total Fluence
Measured from: 8.0959999859333
to: 522.780000001192 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.226833 1.420591 1.186466 0.256611
0.124121 0.118355 0.104232 0.095878 [error]
Peak 0.019498 0.013448 0.012689 0.003200
0.005683 0.005397 0.004825 0.004392 [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 3.01e-07 5.94e-07 9.10e-07 3.05e-06 2.55e-06 4.85e-06 erg/cm2
Error 4.86e-08 5.53e-08 1.03e-07 7.83e-07 2.49e-07 8.49e-07 erg/cm2
Peak flux Power-law 1.38e-01 1.27e-01 8.08e-02 7.89e-02 3.79e-01 4.25e-01 ph/cm2/s
Error 6.67e-02 4.15e-02 3.77e-02 7.45e-02 1.23e-01 1.43e-01 ph/cm2/s
Fluence Cutoff-PL 3.01e-07 5.95e-07 9.11e-07 3.02e-06 2.55e-06 4.85e-06 erg/cm2
Error 4.86e-08 5.54e-08 1.03e-07 7.77e-07 2.49e-07 8.44e-07 erg/cm2
Peak flux Cutoff-PL 1.25e-01 1.43e-01 7.93e-02 2.14e-02 3.65e-01 3.69e-01 ph/cm2/s
Error 7.42e-02 5.76e-02 6.19e-02 8.01e-02 1.25e-01 1.55e-01 ph/cm2/s
Fluence Band 2.98e-07 5.92e-07 9.09e-07 3.02e-06 2.55e-06 4.83e-06 erg/cm2
Error 4.81e-08 5.52e-08 1.03e-07 7.77e-07 2.49e-07 9.05e-07 erg/cm2
Peak flux Band 1.25e-01 1.46e-01 7.55e-02 3.87e-02 3.67e-01 3.86e-01 ph/cm2/s
Error 7.21e-02 5.71e-02 4.44e-02 7.93e-02 1.25e-01 1.60e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.384 0.163 - - 5.11e-04 4.40e-05 55.145 57
CPL 1.332 0.314 696.2 0.0 5.40e-04 4.43e-05 55.327 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.653 0.580 - - 2.90e-03 1.06e-03 64.913 57
CPL 0.617 2.590 56.0 5000.0 1.15e-02 5.51e-01 64.329 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: 297.984000 sec.
T50 in the 50-300 keV band: 234.496000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 514.684 8.096 522.780
T90 468.320 25.944 494.264
T50 307.244 64.204 371.448
Peak 1.000 37.180 38.180
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
197.0065 -75.6164 0.0180 11.4 -111.7 1.0353 10.7 TRIG_00349592
------------------------------------------
Foreground time interval of the image:
8.096 72.401 (delta_t = 64.305 [sec])
Background time interval of the image:
-135.599 8.096 (delta_t = 143.695 [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 8.096 sec. to 522.780 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38412 ( -0.162796 0.162535 )
Norm@50keV : 5.107253E-04 ( -4.411468E-05 4.395761E-05) )
------------------------------------------------------------
Chi-Squared = 55.14502 using 59 PHA bins.
Reduced chi-squared = 0.9674566 for 57 degrees of freedom
Null hypothesis probability = 0.545
Photon flux (15-150 keV) in 514.7 sec: 6.197635E-02 ( -0.00542978 0.00544462 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54869e-06 ( -2.48307e-07 2.50376e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.096 sec. to 522.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33240 ( -0.410068 0.217187 )
Epeak [keV] : 696.169 ( )
Norm@50keV : 5.400566E-04 ( -4.537569E-05 4.320790E-05) )
------------------------------------------------------------
Chi-Squared = 55.32706 using 59 PHA bins.
Reduced chi-squared = 0.9879832 for 56 degrees of freedom
Null hypothesis probability = 0.500
Photon flux (15-150 keV) in 514.7 sec: 6.195076E-02 ( -0.00542152 0.00544247 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54897e-06 ( -2.48543e-07 2.50278e-07 ) ergs/cm2
Band function
Time interval is from 8.096 sec. to 522.780 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06302 ( -8.93698 5.94640 )
beta : -1.38285 ( -8.61715 0.161652 )
Epeak [keV] : 53.4165 ( -53.3165 754.894 )
Norm@50keV : 9.725335E-04 ( -9.725335E-04 5.34176 )
------------------------------------------------------------
Chi-Squared = 55.14852 using 59 PHA bins.
Reduced chi-squared = 1.002700 for 55 degrees of freedom
Null hypothesis probability = 0.469
Photon flux (15-150 keV) in 514.7 sec: 6.197804E-02 ( -0.00527096 0.00528939 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5461e-06 ( -2.47766e-07 2.50818e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 37.180 sec. to 38.180 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65252 ( -0.558354 0.601272 )
Norm@50keV : 2.898398E-03 ( -1.084844E-03 1.041262E-03) )
------------------------------------------------------------
Chi-Squared = 64.91270 using 59 PHA bins.
Reduced chi-squared = 1.138819 for 57 degrees of freedom
Null hypothesis probability = 0.220
Photon flux (15-150 keV) in 1.000 sec: 0.378703 ( -0.122997 0.123054 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69608e-08 ( -1.0196e-08 1.08553e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 37.180 sec. to 38.180 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.616930 ( -3.61693 1.56271 )
Epeak [keV] : 56.0418 ( -56.0318 9943.96 )
Norm@50keV : 1.145399E-02 ( -1.145399E-02 1.08993 )
------------------------------------------------------------
Chi-Squared = 64.32858 using 59 PHA bins.
Reduced chi-squared = 1.148725 for 56 degrees of freedom
Null hypothesis probability = 0.208
Photon flux (15-150 keV) in 1.000 sec: 0.364605 ( -0.124633 0.125875 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38164e-08 ( -1.00731e-08 1.26478e-08 ) ergs/cm2
Band function
Time interval is from 37.180 sec. to 38.180 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.751308 ( -12.7053 2.29468 )
beta : -2.25601 ( -7.86069 0.741878 )
Epeak [keV] : 59.3375 ( -30.6100 423.846 )
Norm@50keV : 9.672697E-03 ( -80.0556 156.707 )
------------------------------------------------------------
Chi-Squared = 64.35683 using 59 PHA bins.
Reduced chi-squared = 1.170124 for 55 degrees of freedom
Null hypothesis probability = 0.182
Photon flux (15-150 keV) in 1.000 sec: 0.366983 ( -0.122547 0.12745 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64449e-08 ( -1.2412e-08 1.03557e-08 ) ergs/cm2
Plot creation:
Sun Apr 19 23:47:21 EDT 2009