batgrbproduct Analysis for Trigger=158593
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 Jan 9 15:17:53 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger158593/SDC
======================================================================
Trigger: 00158593 Segment: 000
BAT Trigger Time: 150323433.024 [s; MET]
Trigger Stop: 150323437.12 [s; MET]
UTC: 2005-10-06T20:30:33.255560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 110.830064621421 Dec: 9.53064743051798 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.25
Image Trigger?: NO
Rate S/N Ratio: 17.1464281994822 [ if not an image trigger ]
Image S/N Ratio: 7.25
Flight Position: [ source = BAT ]
RA: 110.830064621421 Dec: 9.53064743051798 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 110.794598750862 Dec: 9.49998650370074 [deg; J2000]
{ 07h 23m 10.7s , +09d 30' 00.0" }
+/- 2.03573506144558 [arcmin] (estimated 90% radius based on SNR)
+/- 1.14448575870663 [arcmin] (formal 1-sigma fit error)
SNR: 11.0176256850275
RA = 7h 23m 10.7s (110.794599 deg.)
Dec = 9d 29' 60" (9.499987 deg.)
Angular difference between Flight and Ground position is 2.790836 arcmin
Partial Coding Fraction: 0.2167969 [ including projection effects ]
Duration
T90: 140 +/- 50.3115294937453
Measured from: -116.023999989033
to: 23.9760000109673 [s; relative to TRIGTIME]
T50: 23 +/- 38.8329756778952
Measured from: -15.0239999890327
to: 7.97600001096725 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.97600001096725
to: 3.97600001096725 [s; relative to TRIGTIME]
Total Fluence
Measured from: -128.023999989033
to: 31.9760000109673 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.678582 1.076783 0.741642 0.310476
0.130076 0.131670 0.111413 0.095643 [error]
Peak 0.038396 0.062778 0.055729 0.014941
0.010925 0.011663 0.010309 0.008300 [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 2.36e-07 4.32e-07 6.10e-07 1.80e-06 1.75e-06 3.09e-06 erg/cm2
Error 6.01e-08 6.62e-08 1.12e-07 7.30e-07 2.71e-07 8.07e-07 erg/cm2
Peak flux Power-law 3.89e-01 4.67e-01 4.05e-01 6.01e-01 1.47e+00 1.86e+00 ph/cm2/s
Error 1.40e-01 1.04e-01 8.00e-02 2.49e-01 2.84e-01 3.44e-01 ph/cm2/s
Fluence Cutoff-PL 2.36e-07 4.33e-07 6.10e-07 1.79e-06 1.75e-06 2.93e-06 erg/cm2
Error 6.01e-08 6.63e-08 1.12e-07 7.25e-07 2.71e-07 8.47e-07 erg/cm2
Peak flux Cutoff-PL 3.36e-01 4.93e-01 4.39e-01 3.19e-01 1.44e+00 1.59e+00 ph/cm2/s
Error 1.65e-01 1.22e-01 1.01e-01 4.11e-01 2.88e-01 4.60e-01 ph/cm2/s
Fluence Band 2.27e-07 4.28e-07 6.17e-07 1.89e-06 1.75e-06 3.18e-06 erg/cm2
Error 4.18e-08 6.03e-08 9.36e-08 5.37e-07 2.67e-07 4.49e-07 erg/cm2
Peak flux Band 3.27e-01 5.07e-01 4.13e-01 5.01e-01 1.45e+00 1.70e+00 ph/cm2/s
Error 1.42e-01 1.40e-01 9.88e-02 4.14e-01 2.86e-01 4.47e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.504 0.255 - - 1.15e-03 1.65e-04 69.618 57
CPL 1.365 0.970 224.5 0.0 1.36e-03 1.22e-03 69.829 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.205 0.308 - - 1.25e-02 2.29e-03 51.516 57
CPL 0.523 1.274 118.2 5000.0 2.64e-02 6.61e-02 50.631 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: 12.352000 sec.
T50 in the 50-300 keV band: 4.928000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 160.000 -128.024 31.976
T90 140.000 -116.024 23.976
T50 23.000 -15.024 7.976
Peak 1.000 2.976 3.976
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
110.7946 +9.5000 0.0176 35.8 120.7 3.6586 11.0 TRIG_00158593
------------------------------------------
Foreground time interval of the image:
-128.024 31.976 (delta_t = 160.000 [sec])
Background time interval of the image:
-299.024 -128.024 (delta_t = 171.000 [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 -128.024 sec. to 31.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50436 ( -0.255851 0.254558 )
Norm@50keV : 1.150528E-03 ( -1.654188E-04 1.644536E-04) )
------------------------------------------------------------
Chi-Squared = 69.61772 using 59 PHA bins.
Reduced chi-squared = 1.221364 for 57 degrees of freedom
Null hypothesis probability = 0.122
Photon flux (15-150 keV) in 160.0 sec: 0.143801 ( -0.02125 0.02133 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74504e-06 ( -2.70109e-07 2.72512e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -128.024 sec. to 31.976 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.36471 ( -0.777848 1.16282 )
Epeak [keV] : 224.466 ( )
Norm@50keV : 1.359136E-03 ( -1.151779E-03 1.278545E-03) )
------------------------------------------------------------
Chi-Squared = 69.82888 using 59 PHA bins.
but latest trial 2.52753 gives Chi-Squared = 2.46606
but latest trial 3.417896E-03 gives Chi-Squared = 512.208
Reduced chi-squared = 1.246944 for 56 degrees of freedom
Null hypothesis probability = 0.101
Photon flux (15-150 keV) in 160.0 sec: 0.143758 ( -0.021243 0.021323 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7453e-06 ( -2.70192e-07 2.7264e-07 ) ergs/cm2
Band function
Time interval is from -128.024 sec. to 31.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01624 ( -8.98376 6.01624 )
beta : -1.54962 ( -8.45038 0.289603 )
Epeak [keV] : 64.1298 ( -64.0298 559.468 )
Norm@50keV : 2.416126E-03 ( -6.492514E-02 41.0614 )
------------------------------------------------------------
Chi-Squared = 69.37823 using 59 PHA bins.
Reduced chi-squared = 1.261422 for 55 degrees of freedom
Null hypothesis probability = 9.188E-02
Photon flux (15-150 keV) in 160.0 sec: 0.143693 ( -0.021089 0.020882 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75112e-06 ( -2.68963e-07 2.65664e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.976 sec. to 3.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20501 ( -0.316154 0.300391 )
Norm@50keV : 1.253505E-02 ( -2.291912E-03 2.284299E-03) )
------------------------------------------------------------
Chi-Squared = 51.51572 using 59 PHA bins.
Reduced chi-squared = 0.9037845 for 57 degrees of freedom
Null hypothesis probability = 0.680
Photon flux (15-150 keV) in 1.000 sec: 1.47238 ( -0.28292 0.28486 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27029e-07 ( -2.4163e-08 2.4301e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.976 sec. to 3.976 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.523483 ( -1.62192 0.925752 )
Epeak [keV] : 118.156 ( -118.146 9881.84 )
Norm@50keV : 2.635333E-02 ( -1.709995E-02 0.115165 )
------------------------------------------------------------
Chi-Squared = 50.63108 using 59 PHA bins.
but latest trial 9.486465E-03 gives Chi-Squared = 5.81004
Reduced chi-squared = 0.9041265 for 56 degrees of freedom
Null hypothesis probability = 0.678
Photon flux (15-150 keV) in 1.000 sec: 1.44439 ( -0.28749 0.28861 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23427e-07 ( -2.5976e-08 2.5529e-08 ) ergs/cm2
Band function
Time interval is from 2.976 sec. to 3.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.169497 ( -9.83050 4.71738 )
beta : -1.60004 ( -8.39996 0.646830 )
Epeak [keV] : 85.7021 ( -85.6021 913.595 )
Norm@50keV : 4.188702E-02 ( -112.971 28.0315 )
------------------------------------------------------------
Chi-Squared = 50.46436 using 59 PHA bins.
Reduced chi-squared = 0.9175338 for 55 degrees of freedom
Null hypothesis probability = 0.648
Photon flux (15-150 keV) in 1.000 sec: 1.44663 ( -0.28142 0.29071 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25801e-07 ( -2.5364e-08 2.2431e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 15:28:34 EST 2008