batgrbproduct Analysis for Trigger=153463
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): Thu Jan 10 18:45:20 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger153463/SDC
======================================================================
Trigger: 00153463 Segment: 000
BAT Trigger Time: 147475320 [s; MET]
Trigger Stop: 147475384 [s; MET]
UTC: 2005-09-03T21:22:00.290340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 81.986633005844 Dec: 18.6510255844512 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.31
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 16.31
Flight Position: [ source = BAT ]
RA: 81.986633005844 Dec: 18.6510255844512 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 81.9076290584001 Dec: 18.5790081089511 [deg; J2000]
{ 05h 27m 37.8s , +18d 34' 44.4" }
+/- 1.52980021669436 [arcmin] (estimated 90% radius based on SNR)
+/- 3.15027885359304 [arcmin] (formal 1-sigma fit error)
SNR: 16.571220531274
RA = 5h 27m 37.8s (81.907629 deg.)
Dec = 18d 34' 44" (18.579008 deg.)
Angular difference between Flight and Ground position is 6.233119 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 80 +/- 16
Measured from: -12
to: 68 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: 4
to: 36 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 43.5
to: 44.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: -12
to: 84 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.052249 0.949214 0.411314 0.066171
0.048910 0.048934 0.042787 0.040475 [error]
Peak 0.257235 0.229975 0.134692 0.030451
0.019786 0.019896 0.017548 0.016475 [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 3.12e-07 3.82e-07 3.40e-07 5.22e-07 1.22e-06 1.56e-06 erg/cm2
Error 3.03e-08 2.44e-08 4.01e-08 1.24e-07 8.93e-08 1.65e-07 erg/cm2
Peak flux Power-law 1.49e-01 1.10e-01 5.36e-02 3.72e-02 3.30e-01 3.49e-01 ph/cm2/s
Error 2.16e-02 1.04e-02 9.16e-03 1.24e-02 3.14e-02 3.32e-02 ph/cm2/s
Fluence Cutoff-PL 3.00e-07 3.99e-07 3.29e-07 2.43e-07 1.16e-06 1.26e-06 erg/cm2
Error 3.44e-08 3.22e-08 4.66e-08 2.48e-07 1.13e-07 2.77e-07 erg/cm2
Peak flux Cutoff-PL 1.49e-01 1.10e-01 5.35e-02 3.69e-02 3.29e-01 3.49e-01 ph/cm2/s
Error 2.16e-02 1.04e-02 9.17e-03 1.23e-02 3.14e-02 3.32e-02 ph/cm2/s
Fluence Band 2.95e-07 4.00e-07 3.21e-07 3.58e-07 1.16e-06 1.38e-06 erg/cm2
Error 3.49e-08 3.32e-08 4.91e-08 2.45e-07 1.37e-07 2.82e-07 erg/cm2
Peak flux Band 1.49e-01 1.10e-01 5.35e-02 3.69e-02 3.29e-01 3.49e-01 ph/cm2/s
Error 2.16e-02 1.04e-02 9.16e-03 1.23e-02 3.14e-02 3.32e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.169 0.134 - - 1.35e-03 1.13e-04 43.948 57
CPL 1.584 0.000 29.1 0.0 2.93e-03 2.73e-03 42.355 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.033 0.199 - - 2.16e-03 2.72e-04 69.100 57
CPL 2.092 0.415 66.2 4982.9 2.00e-03 1.77e-03 69.073 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: 40.512000 sec.
T50 in the 50-300 keV band: 21.696000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 96.000 -12.000 84.000
T90 80.000 -12.000 68.000
T50 32.000 4.000 36.000
Peak 1.000 43.500 44.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
81.9076 +18.5790 0.0116 2.1 57.9 2.5599 16.6 TRIG_00153463
------------------------------------------
Foreground time interval of the image:
-12.000 76.205 (delta_t = 88.205 [sec])
Background time interval of the image:
-60.000 -12.000 (delta_t = 48.000 [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 -12.000 sec. to 84.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16942 ( -0.132423 0.136194 )
Norm@50keV : 1.352059E-03 ( -1.135047E-04 1.120152E-04) )
------------------------------------------------------------
Chi-Squared = 43.94831 using 59 PHA bins.
Reduced chi-squared = 0.7710229 for 57 degrees of freedom
Null hypothesis probability = 0.897
Photon flux (15-150 keV) in 96.00 sec: 0.220299 ( -0.014371 0.014397 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21542e-06 ( -8.86752e-08 8.99232e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.000 sec. to 84.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58357 ( )
Epeak [keV] : 29.0770 ( )
Norm@50keV : 2.932652E-03 ( -2.591314E-03 2.865330E-03) )
------------------------------------------------------------
Chi-Squared = 42.35497 using 59 PHA bins.
Reduced chi-squared = 0.7563387 for 56 degrees of freedom
Null hypothesis probability = 0.911
Photon flux (15-150 keV) in 96.00 sec: 0.215159 ( -0.015763 0.015715 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15761e-06 ( -1.11274e-07 1.14211e-07 ) ergs/cm2
Band function
Time interval is from -12.000 sec. to 84.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.67570 ( -8.32430 0.548607 )
beta : -9.29135 ( -7.46603 0.436044 )
Epeak [keV] : 26.6692 ( -25.7890 12.2445 )
Norm@50keV : 2.612134E-03 ( -9.625498E-04 362.202 )
------------------------------------------------------------
Chi-Squared = 42.18134 using 59 PHA bins.
Reduced chi-squared = 0.7669335 for 55 degrees of freedom
Null hypothesis probability = 0.898
Photon flux (15-150 keV) in 96.00 sec: 0.214892 ( -0.015446 0.015585 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16085e-06 ( -1.11379e-07 1.63018e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 36.000 sec. to 52.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03299 ( -0.194145 0.203906 )
Norm@50keV : 2.164034E-03 ( -2.753617E-04 2.678398E-04) )
------------------------------------------------------------
Chi-Squared = 69.09966 using 59 PHA bins.
Reduced chi-squared = 1.212275 for 57 degrees of freedom
Null hypothesis probability = 0.131
Photon flux (15-150 keV) in 16.00 sec: 0.329628 ( -0.03136 0.031381 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.19907e-07 ( -3.69712e-08 3.79072e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 36.000 sec. to 52.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09206 ( -0.704775 0.125353 )
Epeak [keV] : 66.1860 ( -31.9225 9933.81 )
Norm@50keV : 2.001536E-03 ( -5.777479E-04 2.969211E-03) )
------------------------------------------------------------
Chi-Squared = 69.07348 using 59 PHA bins.
but latest trial 2.19276 gives Chi-Squared = 8.123016E-02
Reduced chi-squared = 1.233455 for 56 degrees of freedom
Null hypothesis probability = 0.113
Photon flux (15-150 keV) in 16.00 sec: 0.329498 ( -0.031348 0.031368 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.19902e-07 ( -3.69872e-08 3.78928e-08 ) ergs/cm2
Band function
Time interval is from 36.000 sec. to 52.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.97354 ( -7.33461 4.41655 )
beta : -7.98294 ( -0.204125 0.194168 )
Epeak [keV] : 23.7013 ( -23.6013 9976.30 )
Norm@50keV : 2.311384E-03 ( -3.742573E-02 3.640562E-02) )
------------------------------------------------------------
Chi-Squared = 69.16576 using 59 PHA bins.
Reduced chi-squared = 1.257559 for 55 degrees of freedom
Null hypothesis probability = 9.478E-02
Photon flux (15-150 keV) in 16.00 sec: 0.329498 ( -0.031343 0.031366 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.19739e-07 ( -3.70864e-08 3.77136e-08 ) ergs/cm2
Plot creation:
Thu Jan 10 18:54:25 EST 2008