batgrbproduct Analysis for Trigger=313116
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 Jun 4 18:09:31 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger313116/GCN5_download_cron
======================================================================
Trigger: 00313116 Segment: 000
BAT Trigger Time: 234257224 [s; MET]
Trigger Stop: 234257288 [s; MET]
UTC: 2008-06-04T07:27:01.159600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 236.969995263586 Dec: 20.5553515503071 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.68
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.68
Flight Position: [ source = BAT ]
RA: 236.969995263586 Dec: 20.5553515503071 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 236.959771021311 Dec: 20.5570703891239 [deg; J2000]
{ 15h 47m 50.3s , +20d 33' 25.5" }
+/- 1.98317316395197 [arcmin] (estimated 90% radius based on SNR)
+/- 0.718155404709691 [arcmin] (formal 1-sigma fit error)
SNR: 11.4371408624804
Angular difference between Flight and Ground position is 0.583580 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 81.9679999947548 +/- 12.6609775046947
Measured from: -23.0839999914169
to: 58.8840000033379 [s; relative to TRIGTIME]
T50: 36.5360000133514 +/- 8.80307606792505
Measured from: -2.85600000619888
to: 33.6800000071526 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -3.02399998903275
to: -2.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: -27.3120000064373
to: 67.2240000069141 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.491770 0.590532 0.303027 0.012860
0.048874 0.046322 0.041159 0.035806 [error]
Peak 0.014766 0.015115 0.015803 0.007557
0.005137 0.004714 0.004251 0.003699 [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 1.44e-07 2.23e-07 2.61e-07 5.87e-07 7.99e-07 1.23e-06 erg/cm2
Error 2.19e-08 2.17e-08 4.00e-08 1.87e-07 9.24e-08 2.24e-07 erg/cm2
Peak flux Power-law 1.09e-01 1.22e-01 9.75e-02 1.29e-01 3.77e-01 4.58e-01 ph/cm2/s
Error 6.29e-02 4.14e-02 3.51e-02 1.07e-01 1.13e-01 1.38e-01 ph/cm2/s
Fluence Cutoff-PL 1.38e-07 2.33e-07 2.59e-07 3.03e-07 7.67e-07 9.35e-07 erg/cm2
Error 2.45e-08 2.95e-08 4.38e-08 3.15e-07 1.08e-07 3.61e-07 erg/cm2
Peak flux Cutoff-PL 1.09e-01 1.22e-01 9.76e-02 1.28e-01 3.76e-01 4.57e-01 ph/cm2/s
Error 6.29e-02 4.15e-02 3.52e-02 1.07e-01 1.13e-01 1.38e-01 ph/cm2/s
Fluence Band 1.34e-07 2.39e-07 2.49e-07 4.56e-07 7.70e-07 1.08e-06 erg/cm2
Error 2.38e-08 2.76e-08 4.68e-08 2.39e-07 1.03e-07 3.23e-07 erg/cm2
Peak flux Band 1.07e-01 1.21e-01 9.81e-02 1.32e-01 3.76e-01 4.60e-01 ph/cm2/s
Error 5.50e-02 3.55e-02 2.93e-02 9.93e-02 1.09e-01 1.33e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.776 0.183 - - 9.18e-04 1.02e-04 47.002 57
CPL 1.186 0.724 60.2 0.0 1.94e-03 1.96e-03 46.470 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.325 0.589 - - 3.14e-03 9.10e-04 46.575 57
CPL 1.321 0.593 9999.2 5000.0 3.15e-03 9.15e-04 46.578 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 94.536 -27.312 67.224
T90 81.968 -23.084 58.884
T50 36.536 -2.856 33.680
Peak 1.000 -3.024 -2.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
236.9598 +20.5571 0.0168 14.6 -17.9 1.2791 11.4 TRIG_00313116
------------------------------------------
Foreground time interval of the image:
-27.312 67.224 (delta_t = 94.536 [sec])
Background time interval of the image:
-239.000 -27.312 (delta_t = 211.688 [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 -27.312 sec. to 67.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77580 ( -0.180737 0.185875 )
Norm@50keV : 9.176534E-04 ( -1.031003E-04 1.012599E-04) )
------------------------------------------------------------
Chi-Squared = 47.00210 using 59 PHA bins.
Reduced chi-squared = 0.8245983 for 57 degrees of freedom
Null hypothesis probability = 0.825
Photon flux (15-150 keV) in 94.54 sec: 0.125284 ( -0.012277 0.012287 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.99359e-07 ( -9.14306e-08 9.32826e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -27.312 sec. to 67.224 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.18608 ( -0.692949 0.755581 )
Epeak [keV] : 60.2452 ( )
Norm@50keV : 1.940775E-03 ( -4.937075E-04 3.418383E-03) )
------------------------------------------------------------
Chi-Squared = 46.46974 using 59 PHA bins.
but latest trial 9.24950 gives Chi-Squared = 3.03420
but latest trial 7.553236E-04 gives Chi-Squared = 2.56246
Reduced chi-squared = 0.8298168 for 56 degrees of freedom
Null hypothesis probability = 0.814
Photon flux (15-150 keV) in 94.54 sec: 0.123229 ( -0.012959 0.006426 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.67226e-07 ( -1.10944e-07 1.04783e-07 ) ergs/cm2
Band function
Time interval is from -27.312 sec. to 67.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12107 ( -11.0697 2.21144 )
beta : -2.02034 ( -0.301901 0.288025 )
Epeak [keV] : 51.5454 ( -30.5417 830.546 )
Norm@50keV : 2.263099E-03 ( -1.37371 67.3009 )
------------------------------------------------------------
Chi-Squared = 45.57390 using 59 PHA bins.
Reduced chi-squared = 0.8286163 for 55 degrees of freedom
Null hypothesis probability = 0.814
Photon flux (15-150 keV) in 94.54 sec: 0.122883 ( -0.01292 0.013055 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.70135e-07 ( -1.058e-07 1.00588e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -3.024 sec. to -2.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32455 ( -0.593508 0.584842 )
Norm@50keV : 3.142328E-03 ( -9.127131E-04 9.073711E-04) )
------------------------------------------------------------
Chi-Squared = 46.57458 using 59 PHA bins.
Reduced chi-squared = 0.8170979 for 57 degrees of freedom
Null hypothesis probability = 0.836
Photon flux (15-150 keV) in 1.000 sec: 0.376637 ( -0.112297 0.112995 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08791e-08 ( -1.00157e-08 1.02273e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.024 sec. to -2.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32120 ( -0.597905 0.588138 )
Epeak [keV] : 9999.24 ( -9999.23 0.762695 )
Norm@50keV : 3.154959E-03 ( -9.190366E-04 9.118619E-04) )
------------------------------------------------------------
Chi-Squared = 46.57800 using 59 PHA bins.
Reduced chi-squared = 0.8317500 for 56 degrees of freedom
Null hypothesis probability = 0.811
Photon flux (15-150 keV) in 1.000 sec: 0.376488 ( -0.112257 0.112959 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08733e-08 ( -1.00099e-08 1.0244e-08 ) ergs/cm2
Band function
Time interval is from -3.024 sec. to -2.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09518 ( -8.90482 6.09518 )
beta : -1.32450 ( -8.67550 0.593474 )
Epeak [keV] : 24.6133 ( -24.5133 9975.39 )
Norm@50keV : 6.370375E-03 ( -6.370375E-03 771.998 )
------------------------------------------------------------
Chi-Squared = 46.57458 using 59 PHA bins.
Reduced chi-squared = 0.8468105 for 55 degrees of freedom
Null hypothesis probability = 0.783
Photon flux (15-150 keV) in 1.000 sec: 0.375739 ( -0.110233 0.108156 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11307e-08 ( -8.9636e-09 8.9606e-09 ) ergs/cm2
Plot creation:
Wed Jun 4 18:45:00 EDT 2008