batgrbproduct Analysis for Trigger=313087
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 09:37:25 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger313087/GCN5_download_cron
======================================================================
Trigger: 00313087 Segment: 000
BAT Trigger Time: 234214696.128 [s; MET]
Trigger Stop: 234214696.64 [s; MET]
UTC: 2008-06-03T19:38:13.288800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 176.527531635607 Dec: 68.0759595189382 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.63
Image Trigger?: NO
Rate S/N Ratio: 19.3649167310371 [ if not an image trigger ]
Image S/N Ratio: 10.63
Flight Position: [ source = BAT ]
RA: 176.527531635607 Dec: 68.0759595189382 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 176.554345626386 Dec: 68.0612619247645 [deg; J2000]
{ 11h 46m 13.0s , +68d 03' 40.5" }
+/- 0.843168384460648 [arcmin] (estimated 90% radius based on SNR)
+/- 0.261409545959404 [arcmin] (formal 1-sigma fit error)
SNR: 38.811021596501
Angular difference between Flight and Ground position is 1.067120 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 59.136000007391 +/- 1.72253304049247
Measured from: 0.939999997615814
to: 60.0760000050068 [s; relative to TRIGTIME]
T50: 45.3600000143051 +/- 1.1043622702512
Measured from: 3.608000010252
to: 48.9680000245571 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.964000016450882
to: 1.96400001645088 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.11599999666214
to: 68.6120000183582 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.456789 1.748140 1.059472 0.154118
0.040654 0.041600 0.037055 0.031979 [error]
Peak 0.099833 0.156425 0.152732 0.050581
0.006033 0.006816 0.006867 0.005519 [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 4.62e-07 7.16e-07 8.34e-07 1.87e-06 2.56e-06 3.88e-06 erg/cm2
Error 2.89e-08 2.53e-08 3.86e-08 1.94e-07 8.95e-08 2.18e-07 erg/cm2
Peak flux Power-law 8.74e-01 1.10e+00 1.01e+00 1.61e+00 3.53e+00 4.59e+00 ph/cm2/s
Error 8.91e-02 6.53e-02 5.55e-02 2.01e-01 1.75e-01 2.39e-01 ph/cm2/s
Fluence Cutoff-PL 4.09e-07 7.43e-07 8.55e-07 9.05e-07 2.45e-06 2.90e-06 erg/cm2
Error 3.74e-08 2.91e-08 3.17e-08 3.14e-07 1.07e-07 3.33e-07 erg/cm2
Peak flux Cutoff-PL 8.73e-01 1.10e+00 1.01e+00 1.60e+00 3.53e+00 4.58e+00 ph/cm2/s
Error 8.90e-02 6.54e-02 5.56e-02 1.99e-01 1.75e-01 2.38e-01 ph/cm2/s
Fluence Band 4.06e-07 7.40e-07 8.54e-07 9.04e-07 2.44e-06 2.92e-06 erg/cm2
Error 3.70e-08 2.90e-08 4.23e-08 3.13e-07 1.07e-07 4.50e-07 erg/cm2
Peak flux Band 8.76e-01 1.10e+00 1.01e+00 1.60e+00 3.53e+00 4.58e+00 ph/cm2/s
Error 6.72e-02 6.53e-02 5.56e-02 2.00e-01 1.75e-01 3.49e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.779 0.066 - - 4.05e-03 1.38e-04 75.031 57
CPL 1.211 0.296 70.7 15.8 7.63e-03 2.54e-03 62.889 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.127 0.091 - - 3.03e-02 1.45e-03 44.960 57
CPL 1.122 0.191 9310.6 5000.0 3.05e-02 5.84e-03 44.975 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: 54.784000 sec.
T50 in the 50-300 keV band: 10.240000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 68.728 -0.116 68.612
T90 59.136 0.940 60.076
T50 45.360 3.608 48.968
Peak 1.000 0.964 1.964
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
176.5543 +68.0613 0.0049 17.2 -6.6 1.4001 38.8 TRIG_00313087
------------------------------------------
Foreground time interval of the image:
-0.116 7.873 (delta_t = 7.989 [sec])
Background time interval of the image:
-30.627 -0.116 (delta_t = 30.511 [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 -0.116 sec. to 68.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77877 ( -6.589246E-02 6.638110E-02) )
Norm@50keV : 4.045736E-03 ( -1.379461E-04 1.374925E-04) )
------------------------------------------------------------
Chi-Squared = 75.03064 using 59 PHA bins.
Reduced chi-squared = 1.316327 for 57 degrees of freedom
Null hypothesis probability = 5.495E-02
Photon flux (15-150 keV) in 68.73 sec: 0.552974 ( -0.020126 0.020222 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56195e-06 ( -8.9294e-08 8.97476e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.116 sec. to 68.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21125 ( -0.305742 0.286461 )
Epeak [keV] : 70.6896 ( -9.50406 22.0194 )
Norm@50keV : 7.625407E-03 ( -2.049520E-03 3.038647E-03) )
------------------------------------------------------------
Chi-Squared = 62.88856 using 59 PHA bins.
Reduced chi-squared = 1.123010 for 56 degrees of freedom
Null hypothesis probability = 0.246
Photon flux (15-150 keV) in 68.73 sec: 0.528093 ( -0.023152 0.023262 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44519e-06 ( -1.07397e-07 1.06257e-07 ) ergs/cm2
Band function
Time interval is from -0.116 sec. to 68.612 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21263 ( -0.284984 0.307207 )
beta : -9.09499 ( -0.905011 7.06462 )
Epeak [keV] : 70.7292 ( -9.54380 21.9665 )
Norm@50keV : 7.612653E-03 ( -2.037746E-03 3.051835E-03) )
------------------------------------------------------------
Chi-Squared = 62.88908 using 59 PHA bins.
Reduced chi-squared = 1.143438 for 55 degrees of freedom
Null hypothesis probability = 0.217
Photon flux (15-150 keV) in 68.73 sec: 0.528121 ( -0.023181 0.023253 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44259e-06 ( -1.07061e-07 1.06284e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.964 sec. to 1.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12722 ( -9.138441E-02 9.103584E-02) )
Norm@50keV : 3.033486E-02 ( -1.451612E-03 1.451021E-03) )
------------------------------------------------------------
Chi-Squared = 44.95972 using 59 PHA bins.
Reduced chi-squared = 0.7887670 for 57 degrees of freedom
Null hypothesis probability = 0.876
Photon flux (15-150 keV) in 1.000 sec: 3.52854 ( -0.17469 0.17503 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14472e-07 ( -1.689e-08 1.6917e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.964 sec. to 1.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12232 ( -0.290773 9.149420E-02) )
Epeak [keV] : 9310.59 ( -9310.58 689.407 )
Norm@50keV : 3.050191E-02 ( -1.462454E-03 1.022384E-02) )
------------------------------------------------------------
Chi-Squared = 44.97472 using 59 PHA bins.
Reduced chi-squared = 0.8031200 for 56 degrees of freedom
Null hypothesis probability = 0.854
Photon flux (15-150 keV) in 1.000 sec: 3.52733 ( -0.17461 0.17496 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.1454e-07 ( -1.6883e-08 1.6944e-08 ) ergs/cm2
Band function
Time interval is from 0.964 sec. to 1.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.910043 ( -9.08996 5.90877 )
beta : -1.12732 ( -8.87268 9.151065E-02) )
Epeak [keV] : 55.0282 ( -54.9282 9944.97 )
Norm@50keV : 5.241350E-02 ( -2.352469E-02 155.588 )
------------------------------------------------------------
Chi-Squared = 44.95973 using 59 PHA bins.
Reduced chi-squared = 0.8174497 for 55 degrees of freedom
Null hypothesis probability = 0.831
Photon flux (15-150 keV) in 1.000 sec: 3.52734 ( -0.17459 0.17486 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14364e-07 ( -1.694e-08 1.6873e-08 ) ergs/cm2
Plot creation:
Wed Jun 4 10:13:37 EDT 2008