batgrbproduct Analysis for Trigger=145581
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): Mon Jan 7 12:57:17 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger145581/GCN5_download_hand
======================================================================
Trigger: 00145581 Segment: 000
BAT Trigger Time: 142869627.136 [s; MET]
Trigger Stop: 142869654.016 [s; MET]
UTC: 2005-07-12T14:00:27.517820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 77.6928992397336 Dec: 64.898850024641 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.89
Image Trigger?: NO
Rate S/N Ratio: 11.7898261225516 [ if not an image trigger ]
Image S/N Ratio: 8.89
Flight Position: [ source = BAT ]
RA: 77.6928992397336 Dec: 64.898850024641 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 77.7208658523046 Dec: 64.9270268266223 [deg; J2000]
{ 05h 10m 53.0s , +64d 55' 37.3" }
+/- 1.69262423973553 [arcmin] (estimated 90% radius based on SNR)
+/- 0.758382477392214 [arcmin] (formal 1-sigma fit error)
SNR: 14.3417880483577
RA = 5h 10m 53.0s (77.720866 deg.)
Dec = 64d 55' 37" (64.927027 deg.)
Angular difference between Flight and Ground position is 1.834212 arcmin
Partial Coding Fraction: 0.46875 [ including projection effects ]
Duration
T90: 51.6319999992847 +/- 7.60321327139796
Measured from: -13.2639999985695
to: 38.3680000007153 [s; relative to TRIGTIME]
T50: 26.9280000030994 +/- 7.92502666957634
Measured from: -1.83599999547005
to: 25.0920000076294 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 17.3879999816418
to: 18.3879999816418 [s; relative to TRIGTIME]
Total Fluence
Measured from: -20.444000005722
to: 40.1239999830723 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.426363 0.605877 0.479758 0.104579
0.053125 0.054685 0.048917 0.042990 [error]
Peak 0.020461 0.024052 0.013763 0.008117
0.006952 0.006898 0.006187 0.005297 [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 1.46e-07 2.68e-07 3.78e-07 1.12e-06 1.08e-06 1.92e-06 erg/cm2
Error 2.68e-08 2.89e-08 4.91e-08 3.23e-07 1.19e-07 3.56e-07 erg/cm2
Peak flux Power-law 2.39e-01 1.84e-01 9.44e-02 6.98e-02 5.50e-01 5.87e-01 ph/cm2/s
Error 1.13e-01 6.10e-02 4.92e-02 8.15e-02 1.83e-01 1.96e-01 ph/cm2/s
Fluence Cutoff-PL 1.46e-07 2.68e-07 3.78e-07 1.11e-06 1.08e-06 1.90e-06 erg/cm2
Error 2.68e-08 2.90e-08 4.92e-08 3.21e-07 1.19e-07 4.88e-07 erg/cm2
Peak flux Cutoff-PL 2.28e-01 2.00e-01 9.31e-02 2.89e-02 5.41e-01 5.50e-01 ph/cm2/s
Error 1.21e-01 8.72e-02 7.49e-02 7.85e-02 1.40e-01 2.10e-01 ph/cm2/s
Fluence Band 1.44e-07 2.67e-07 3.78e-07 1.11e-06 1.08e-06 1.92e-06 erg/cm2
Error 1.43e-08 2.45e-07 3.97e-08 2.38e-07 1.13e-07 1.91e-07 erg/cm2
Peak flux Band 2.21e-01 2.16e-01 8.25e-02 3.76e-02 5.39e-01 5.56e-01 ph/cm2/s
Error 9.74e-02 8.44e-02 7.00e-02 4.72e-02 1.85e-01 1.95e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.505 0.184 - - 1.88e-03 1.90e-04 61.432 57
CPL 1.429 0.884 382.5 0.0 2.03e-03 1.91e-04 61.679 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.960 0.625 - - 3.73e-03 1.52e-03 51.799 57
CPL 1.316 2.579 43.4 4993.9 8.98e-03 2.11e+00 51.583 0
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: 56.896000 sec.
T50 in the 50-300 keV band: 21.504000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 60.568 -20.444 40.124
T90 51.632 -13.264 38.368
T50 26.928 -1.836 25.092
Peak 1.000 17.388 18.388
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
77.7209 +64.9270 0.0134 38.4 -141.1 1.7159 14.3 TRIG_00145581
------------------------------------------
Foreground time interval of the image:
-20.444 40.124 (delta_t = 60.568 [sec])
Background time interval of the image:
-299.136 -20.444 (delta_t = 278.692 [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 -20.444 sec. to 40.124 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50482 ( -0.183238 0.184065 )
Norm@50keV : 1.882825E-03 ( -1.899397E-04 1.891084E-04) )
------------------------------------------------------------
Chi-Squared = 61.43223 using 59 PHA bins.
Reduced chi-squared = 1.077758 for 57 degrees of freedom
Null hypothesis probability = 0.320
Photon flux (15-150 keV) in 60.57 sec: 0.235356 ( -0.024505 0.024594 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0809e-06 ( -1.18027e-07 1.18978e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.444 sec. to 40.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42883 ( -0.506042 1.26167 )
Epeak [keV] : 382.548 ( )
Norm@50keV : 2.030489E-03 ( -1.928412E-04 1.882698E-04) )
------------------------------------------------------------
Chi-Squared = 61.67876 using 59 PHA bins.
Reduced chi-squared = 1.101406 for 56 degrees of freedom
Null hypothesis probability = 0.280
Photon flux (15-150 keV) in 60.57 sec: 0.235273 ( -0.024456 0.024585 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08129e-06 ( -1.18251e-07 1.18857e-07 ) ergs/cm2
Band function
Time interval is from -20.444 sec. to 40.124 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26510 ( -8.73490 6.26510 )
beta : -1.50482 ( -0.184143 0.183303 )
Epeak [keV] : 19.1198 ( -19.0198 9980.88 )
Norm@50keV : 3.941247E-03 ( -3.941248E-03 240.243 )
------------------------------------------------------------
Chi-Squared = 61.43224 using 59 PHA bins.
Reduced chi-squared = 1.116950 for 55 degrees of freedom
Null hypothesis probability = 0.257
Photon flux (15-150 keV) in 60.57 sec: 0.235272 ( -0.023328 0.032428 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08024e-06 ( -1.07118e-07 1.19299e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 17.388 sec. to 18.388 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96047 ( -0.577190 0.673119 )
Norm@50keV : 3.730970E-03 ( -1.566875E-03 1.473040E-03) )
------------------------------------------------------------
Chi-Squared = 51.79902 using 59 PHA bins.
Reduced chi-squared = 0.9087547 for 57 degrees of freedom
Null hypothesis probability = 0.670
Photon flux (15-150 keV) in 1.000 sec: 0.549726 ( -0.183096 0.183238 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.43331e-08 ( -1.30719e-08 1.37925e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.388 sec. to 18.388 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31588 ( -4.31588 0.841208 )
Epeak [keV] : 43.3841 ( -31.2481 9956.62 )
Norm@50keV : 8.980413E-03 ( -8.980413E-03 4.20493 )
------------------------------------------------------------
Chi-Squared = 51.58270 using 59 PHA bins.
but latest trial 21.4856 gives Chi-Squared = 0.220573
Reduced chi-squared = 0.9211197 for 56 degrees of freedom
Null hypothesis probability = 0.643
Photon flux (15-150 keV) in 1.000 sec: 0.541317 ( -0.18622 0.093861 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.23502e-08 ( -1.56017e-08 1.50994e-08 ) ergs/cm2
Band function
Time interval is from 17.388 sec. to 18.388 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30976 ( -11.4299 3.57009 )
beta : -9.27225 ( -7.55421 0.932606 )
Epeak [keV] : 43.3510 ( -30.7113 401.186 )
Norm@50keV : 9.053597E-03 ( -136.911 69.1790 )
------------------------------------------------------------
Chi-Squared = 51.58268 using 59 PHA bins.
Reduced chi-squared = 0.9378669 for 55 degrees of freedom
Null hypothesis probability = 0.606
Photon flux (15-150 keV) in 1.000 sec: 0.538511 ( -0.183558 0.186911 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20746e-08 ( -1.3321e-08 1.32563e-08 ) ergs/cm2
Plot creation:
Mon Jan 7 13:14:04 EST 2008