batgrbproduct Analysis for Trigger=149118
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): Tue Jan 8 15:15:51 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger149118/SDC
======================================================================
Trigger: 00149118 Segment: 000
BAT Trigger Time: 144957840 [s; MET]
Trigger Stop: 144957904 [s; MET]
UTC: 2005-08-05T18:04:00.340960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 331.153840191259 Dec: 29.9017848080853 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33469
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33469
Flight Position: [ source = BAT ]
RA: 331.153840191259 Dec: 29.9017848080853 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 331.190298155755 Dec: 29.9460860221318 [deg; J2000]
{ 22h 04m 45.7s , +29d 56' 45.9" }
+/- 3.24031381675028 [arcmin] (estimated 90% radius based on SNR)
+/- 1.72541692179821 [arcmin] (formal 1-sigma fit error)
SNR: 5.67163503017399
RA = 22h 4m 45.7s (331.190298 deg.)
Dec = 29d 56' 46" (29.946086 deg.)
Angular difference between Flight and Ground position is 3.264911 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.140421 0.133138 0.040468 0.035416
0.036644 0.036898 0.031907 0.027847 [error]
Peak 0.140421 0.133138 0.040468 0.035416
0.036644 0.036898 0.031907 0.027847 [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 3.89e-08 4.82e-08 4.35e-08 6.79e-08 1.54e-07 1.99e-07 erg/cm2
Error 1.45e-08 1.62e-08 2.51e-08 8.63e-08 6.13e-08 1.12e-07 erg/cm2
Peak flux Power-law 1.98e-02 1.36e-02 6.15e-03 3.85e-03 4.15e-02 4.35e-02 ph/cm2/s
Error 7.56e-03 4.49e-03 3.45e-03 4.59e-03 1.31e-02 1.40e-02 ph/cm2/s
Fluence Cutoff-PL 3.85e-08 6.69e-08 1.27e-08 6.59e-11 1.18e-07 1.18e-07 erg/cm2
Error 1.56e-08 2.26e-08 2.30e-08 7.57e-09 4.32e-08 4.34e-08 erg/cm2
Peak flux Cutoff-PL 1.93e-02 1.92e-02 2.01e-03 5.36e-06 4.04e-02 4.00e-02 ph/cm2/s
Error 7.69e-03 6.51e-03 3.64e-03 4.91e-04 1.17e-02 1.26e-02 ph/cm2/s
Fluence Band 3.65e-08 6.69e-08 1.63e-08 2.57e-10 1.21e-07 1.36e-07 erg/cm2
Error 9.80e-09 2.34e-08 1.11e-08 2.87e-10 5.36e-08 0.00e+00 erg/cm2
Peak flux Band 1.93e-02 1.75e-02 4.57e-03 3.47e-04 4.17e-02 4.11e-02 ph/cm2/s
Error 5.71e-03 5.27e-03 2.68e-03 2.80e-03 1.23e-02 1.28e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.149 0.572 - - 2.57e-04 1.13e-04 63.704 57
CPL -2.499 0.000 30.4 7.2 3.68e-01 1.11e+00 59.045 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.149 0.572 - - 2.57e-04 1.13e-04 63.704 57
CPL -2.499 0.000 30.4 7.2 3.68e-01 1.11e+00 59.045 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
331.1903 +29.9461 0.0338 10.7 101.9 0.3992 5.7 TRIG_00149118
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14941 ( -0.523779 0.620320 )
Norm@50keV : 2.574449E-04 ( -1.128051E-04 1.132921E-04) )
------------------------------------------------------------
Chi-Squared = 63.70386 using 59 PHA bins.
Reduced chi-squared = 1.117612 for 57 degrees of freedom
Null hypothesis probability = 0.252
Photon flux (15-150 keV) in 64.00 sec: 4.152272E-02 ( -0.0130614 0.0131008 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53892e-07 ( -5.81158e-08 6.43968e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49851 ( )
Epeak [keV] : 30.3853 ( -6.19349 8.18044 )
Norm@50keV : 0.367814 ( -0.559367 1.65567 )
------------------------------------------------------------
Chi-Squared = 59.04483 using 59 PHA bins.
Reduced chi-squared = 1.054372 for 56 degrees of freedom
Null hypothesis probability = 0.365
Photon flux (15-150 keV) in 64.00 sec: 4.037093E-02 ( -0.0117172 0.0117765 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18125e-07 ( -3.69696e-08 4.93722e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.929155 ( -4.92733 1.00182 )
beta : -8.40032 ( -0.742553 19.2574 )
Epeak [keV] : 29.9615 ( -8.36769 9.39307 )
Norm@50keV : 1.683980E-03 ( -10.8462 3.22585 )
------------------------------------------------------------
Chi-Squared = 61.18071 using 59 PHA bins.
Reduced chi-squared = 1.112377 for 55 degrees of freedom
Null hypothesis probability = 0.264
Photon flux (15-150 keV) in 64.00 sec: 4.172257E-02 ( -0.0123189 0.0123634 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21464e-07 ( -3.5575e-08 7.1639e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14941 ( -0.523779 0.620320 )
Norm@50keV : 2.574449E-04 ( -1.128051E-04 1.132921E-04) )
------------------------------------------------------------
Chi-Squared = 63.70386 using 59 PHA bins.
Reduced chi-squared = 1.117612 for 57 degrees of freedom
Null hypothesis probability = 0.252
Photon flux (15-150 keV) in 64.00 sec: 4.152272E-02 ( -0.0130614 0.0131008 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53892e-07 ( -5.81158e-08 6.43968e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49851 ( )
Epeak [keV] : 30.3853 ( -6.19349 8.18044 )
Norm@50keV : 0.367814 ( -0.559367 1.65567 )
------------------------------------------------------------
Chi-Squared = 59.04483 using 59 PHA bins.
Reduced chi-squared = 1.054372 for 56 degrees of freedom
Null hypothesis probability = 0.365
Photon flux (15-150 keV) in 64.00 sec: 4.037093E-02 ( -0.0117172 0.0117765 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18125e-07 ( -3.69696e-08 4.93722e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.929155 ( -4.92733 1.00182 )
beta : -8.40032 ( -0.742553 19.2574 )
Epeak [keV] : 29.9615 ( -9.08504 8.51345 )
Norm@50keV : 1.683980E-03 ( -4.04881 5.56213 )
------------------------------------------------------------
Chi-Squared = 61.18071 using 59 PHA bins.
Reduced chi-squared = 1.112377 for 55 degrees of freedom
Null hypothesis probability = 0.264
Photon flux (15-150 keV) in 64.00 sec: 4.172257E-02 ( -0.0123189 0.0123634 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21464e-07 ( -3.5575e-08 7.1639e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 15:30:02 EST 2008