batgrbproduct Analysis for Trigger=163170
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 18:00:29 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger163170/GCN5_download_cron
======================================================================
Trigger: 00163170 Segment: 000
BAT Trigger Time: 153218379.2 [s; MET]
Trigger Stop: 153218383.296 [s; MET]
UTC: 2005-11-09T08:39:39.370220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 345.43961754781 Dec: 38.6721088138371 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.84
Image Trigger?: NO
Rate S/N Ratio: 15.0665191733194 [ if not an image trigger ]
Image S/N Ratio: 9.84
Flight Position: [ source = BAT ]
RA: 345.43961754781 Dec: 38.6721088138371 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 345.463610671997 Dec: 38.65927104705 [deg; J2000]
{ 23h 01m 51.3s , +38d 39' 33.4" }
+/- 1.98272537813421 [arcmin] (estimated 90% radius based on SNR)
+/- 0.823740005588431 [arcmin] (formal 1-sigma fit error)
SNR: 11.4408310481278
RA = 23h 1m 51.3s (345.463611 deg.)
Dec = 38d 39' 33" (38.659271 deg.)
Angular difference between Flight and Ground position is 1.362633 arcmin
Partial Coding Fraction: 0.8984375 [ including projection effects ]
Duration
T90: 14.2080000042915 +/- 3.7781688614362
Measured from: -6.783999979496
to: 7.42400002479553 [s; relative to TRIGTIME]
T50: 6.0160000026226 +/- 2.16562230363598
Measured from: -1.72799998521805
to: 4.28800001740456 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0439999997615814
to: 1.04399999976158 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.57599997520447
to: 8.70400002598763 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.169782 0.203816 0.085184 0.026615
0.021664 0.022133 0.019660 0.018794 [error]
Peak 0.026326 0.016232 0.018462 0.002879
0.005264 0.005417 0.004749 0.004620 [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 5.51e-08 7.63e-08 7.80e-08 1.45e-07 2.56e-07 3.54e-07 erg/cm2
Error 9.72e-09 9.96e-09 1.80e-08 6.58e-08 4.14e-08 8.62e-08 erg/cm2
Peak flux Power-law 2.43e-01 1.83e-01 9.19e-02 6.62e-02 5.48e-01 5.83e-01 ph/cm2/s
Error 8.07e-02 4.43e-02 4.14e-02 5.80e-02 1.30e-01 1.44e-01 ph/cm2/s
Fluence Cutoff-PL 5.09e-08 8.67e-08 7.24e-08 2.78e-08 2.30e-07 2.36e-07 erg/cm2
Error 1.10e-08 1.44e-08 2.26e-08 6.61e-08 4.48e-08 5.31e-08 erg/cm2
Peak flux Cutoff-PL 2.41e-01 1.84e-01 9.25e-02 6.26e-02 5.47e-01 5.76e-01 ph/cm2/s
Error 8.91e-02 5.08e-02 4.16e-02 6.93e-02 1.29e-01 1.51e-01 ph/cm2/s
Fluence Band 5.04e-08 8.64e-08 7.23e-08 2.77e-08 2.30e-07 2.41e-07 erg/cm2
Error 1.09e-08 1.43e-08 2.26e-08 7.62e-08 4.47e-08 0.00e+00 erg/cm2
Peak flux Band 2.42e-01 1.83e-01 9.19e-02 6.57e-02 5.48e-01 5.83e-01 ph/cm2/s
Error 8.40e-02 5.08e-02 4.16e-02 5.76e-02 1.30e-01 1.44e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.968 0.244 - - 1.61e-03 2.70e-04 63.512 57
CPL 0.880 1.219 41.7 29.1 7.02e-03 2.45e-02 60.288 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.991 0.512 - - 3.67e-03 1.24e-03 63.008 57
CPL 1.956 0.991 53.6 4993.2 3.84e-03 1.73e-02 63.010 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 17.280 -8.576 8.704
T90 14.208 -6.784 7.424
T50 6.016 -1.728 4.288
Peak 1.000 0.044 1.044
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
345.4636 +38.6593 0.0167 11.9 98.6 0.4939 11.4 TRIG_00163170
------------------------------------------
Foreground time interval of the image:
-8.576 8.704 (delta_t = 17.280 [sec])
Background time interval of the image:
-299.200 -8.576 (delta_t = 290.624 [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 -8.576 sec. to 8.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96775 ( -0.235466 0.253153 )
Norm@50keV : 1.609099E-03 ( -2.744291E-04 2.659017E-04) )
------------------------------------------------------------
Chi-Squared = 63.51211 using 59 PHA bins.
Reduced chi-squared = 1.114248 for 57 degrees of freedom
Null hypothesis probability = 0.258
Photon flux (15-150 keV) in 17.28 sec: 0.237740 ( -0.030503 0.030503 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55849e-07 ( -4.06771e-08 4.21563e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.576 sec. to 8.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.879549 ( -1.40291 1.03440 )
Epeak [keV] : 41.7008 ( -19.1554 39.0723 )
Norm@50keV : 7.019644E-03 ( -7.019644E-03 4.192271E-02) )
------------------------------------------------------------
Chi-Squared = 60.28818 using 59 PHA bins.
Reduced chi-squared = 1.076575 for 56 degrees of freedom
Null hypothesis probability = 0.323
Photon flux (15-150 keV) in 17.28 sec: 0.229491 ( -0.015843 0.031365 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30282e-07 ( -4.21805e-08 4.73368e-08 ) ergs/cm2
Band function
Time interval is from -8.576 sec. to 8.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05547 ( -0.876532 1.51525 )
beta : -9.26177 ( -0.738225 7.31590 )
Epeak [keV] : 42.0859 ( -10.5715 42.8656 )
Norm@50keV : 5.555115E-03 ( -5.555115E-03 2.518903E-02) )
------------------------------------------------------------
Chi-Squared = 60.35220 using 59 PHA bins.
Reduced chi-squared = 1.097313 for 55 degrees of freedom
Null hypothesis probability = 0.289
Photon flux (15-150 keV) in 17.28 sec: 0.229483 ( -0.031244 0.031375 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30005e-07 ( -4.20751e-08 4.72954e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.064 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99147 ( -0.463499 0.559562 )
Norm@50keV : 3.667792E-03 ( -1.291413E-03 1.186478E-03) )
------------------------------------------------------------
Chi-Squared = 63.00813 using 59 PHA bins.
Reduced chi-squared = 1.105406 for 57 degrees of freedom
Null hypothesis probability = 0.272
Photon flux (15-150 keV) in 0.9600 sec: 0.548021 ( -0.129537 0.129579 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.24336e-08 ( -9.98755e-09 1.06492e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.064 sec. to 1.024 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.95562 ( -1.76392 0.218971 )
Epeak [keV] : 53.6117 ( -40.1041 9946.39 )
Norm@50keV : 3.842088E-03 ( -3.842088E-03 3.077443E-02) )
------------------------------------------------------------
Chi-Squared = 63.01007 using 59 PHA bins.
but latest trial 2.17408 gives Chi-Squared = 0.103367
but latest trial 13.5076 gives Chi-Squared = 5.493164E-04
Reduced chi-squared = 1.125180 for 56 degrees of freedom
Null hypothesis probability = 0.242
Photon flux (15-150 keV) in 0.9600 sec: 0.547291 ( -0.129469 0.129153 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.25471e-08 ( -1.01004e-08 1.05418e-08 ) ergs/cm2
Band function
Time interval is from 0.064 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.84421 ( -4.59770 7.21187 )
beta : -8.17622 ( -0.559690 0.463800 )
Epeak [keV] : 51.2424 ( -51.1424 9948.76 )
Norm@50keV : 4.372187E-03 ( -0.175523 0.161269 )
------------------------------------------------------------
Chi-Squared = 63.03510 using 59 PHA bins.
Reduced chi-squared = 1.146093 for 55 degrees of freedom
Null hypothesis probability = 0.213
Photon flux (15-150 keV) in 0.9600 sec: 0.547852 ( -0.12951 0.129539 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.24217e-08 ( -1.03911e-08 1.06199e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 18:13:10 EST 2008