batgrbproduct Analysis for Trigger=163524
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 18:35:27 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger163524/GCN5_download_cron
======================================================================
Trigger: 00163524 Segment: 000
BAT Trigger Time: 153438064 [s; MET]
Trigger Stop: 153438128 [s; MET]
UTC: 2005-11-11T21:41:04.165520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 283.777118599266 Dec: -2.64015970070468 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33288
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33288
Flight Position: [ source = BAT ]
RA: 283.777118599266 Dec: -2.64015970070468 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 283.792995539534 Dec: -2.71429079543213 [deg; J2000]
{ 18h 55m 10.3s , -02d 42' 51.4" }
+/- 4.41917112633581 [arcmin] (estimated 90% radius based on SNR)
+/- 3.79242759779838 [arcmin] (formal 1-sigma fit error)
SNR: 3.64085114892871
RA = 18h 55m 10.3s (283.792996 deg.)
Dec = -2d 42' 51" (-2.714291 deg.)
Angular difference between Flight and Ground position is 4.548517 arcmin
Partial Coding Fraction: 0.9296875 [ 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 0.002151 0.099670 0.043478 -0.010250
0.029176 0.028025 0.024359 0.020793 [error]
Peak 0.002151 0.099670 0.043478 -0.010250
0.029176 0.028025 0.024359 0.020793 [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 1.63e-08 2.54e-08 2.97e-08 6.69e-08 9.09e-08 1.38e-07 erg/cm2
Error 1.11e-08 1.28e-08 2.09e-08 1.06e-07 5.20e-08 1.22e-07 erg/cm2
Peak flux Power-law 1.66e-02 1.42e-02 8.28e-03 7.24e-03 4.21e-02 4.62e-02 ph/cm2/s
Error 1.15e-02 7.16e-03 5.67e-03 1.05e-02 2.13e-02 2.36e-02 ph/cm2/s
Fluence Cutoff-PL 1.29e-08 3.90e-08 1.89e-08 5.53e-10 7.14e-08 7.12e-08 erg/cm2
Error 8.90e-09 1.75e-08 2.53e-08 3.34e-08 4.05e-08 4.56e-08 erg/cm2
Peak flux Cutoff-PL 1.24e-02 2.16e-02 6.01e-03 1.01e-04 4.01e-02 4.01e-02 ph/cm2/s
Error 1.21e-02 9.93e-03 7.28e-03 3.81e-03 1.83e-02 1.83e-02 ph/cm2/s
Fluence Band 1.10e-08 3.99e-08 2.14e-08 8.74e-09 7.84e-08 7.28e-08 erg/cm2
Error 1.20e-08 1.85e-08 1.99e-08 4.96e-08 4.28e-08 5.66e-08 erg/cm2
Peak flux Band 1.39e-02 2.15e-02 6.46e-03 1.30e-04 4.06e-02 4.17e-02 ph/cm2/s
Error 9.64e-03 6.57e-03 1.91e-03 1.96e-02 1.92e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.775 0.863 - - 3.09e-04 2.40e-04 51.210 57
CPL -2.391 0.000 40.9 14.8 9.47e-02 5.16e-01 48.412 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.775 0.863 - - 3.09e-04 2.40e-04 51.210 57
CPL -2.391 0.000 40.9 14.8 9.47e-02 5.16e-01 48.412 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 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
283.7930 -2.7143 0.0526 22.2 173.7 0.2199 3.6 TRIG_00163524
------------------------------------------
Foreground time interval of the image:
0.000 11.920 (delta_t = 11.920 [sec])
13.000 33.040 (delta_t = 20.040 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 11.920000
13.000000 33.040000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77454 ( -0.798460 0.927079 )
Norm@50keV : 3.087211E-04 ( -3.087211E-04 1.709816E-04) )
------------------------------------------------------------
Chi-Squared = 51.20984 using 59 PHA bins.
Reduced chi-squared = 0.8984182 for 57 degrees of freedom
Null hypothesis probability = 0.691
Photon flux (15-150 keV) in 31.96 sec: 4.212766E-02 ( -0.021256 0.0213001 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.09115e-08 ( -4.9824e-08 5.41572e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 11.920000
13.000000 33.040000
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.39115 ( )
Epeak [keV] : 40.9368 ( -11.0330 18.6397 )
Norm@50keV : 9.465470E-02 ( -0.229964 0.802519 )
------------------------------------------------------------
Chi-Squared = 48.41164 using 59 PHA bins.
but latest trial 58.2081 gives Chi-Squared = 1.53058
Reduced chi-squared = 0.8644935 for 56 degrees of freedom
Null hypothesis probability = 0.754
Photon flux (15-150 keV) in 31.96 sec: 4.010037E-02 ( -0.0179869 0.0186248 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.14312e-08 ( -3.31914e-08 4.78719e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 11.920000
13.000000 33.040000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.577014 ( -3.63154 4.02882 )
beta : -9.32012 ( -0.683524 19.3164 )
Epeak [keV] : 45.2443 ( -18.1732 9954.76 )
Norm@50keV : 7.359022E-03 ( -2.33475 1.07961 )
------------------------------------------------------------
Chi-Squared = 49.04776 using 59 PHA bins.
Reduced chi-squared = 0.8917775 for 55 degrees of freedom
Null hypothesis probability = 0.700
Photon flux (15-150 keV) in 31.96 sec: 4.063568E-02 ( -0.0197192 0.0194711 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.84327e-08 ( -4.10226e-08 4.45558e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 13.000 sec. to 33.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77454 ( -0.798460 0.927079 )
Norm@50keV : 3.087211E-04 ( -3.087211E-04 1.709816E-04) )
------------------------------------------------------------
Chi-Squared = 51.20984 using 59 PHA bins.
Reduced chi-squared = 0.8984182 for 57 degrees of freedom
Null hypothesis probability = 0.691
Photon flux (15-150 keV) in 31.96 sec: 4.212766E-02 ( -0.021256 0.0213001 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.09115e-08 ( -4.9824e-08 5.41572e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.000 sec. to 33.040 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.39115 ( )
Epeak [keV] : 40.9368 ( -11.0330 18.6397 )
Norm@50keV : 9.465470E-02 ( -0.229964 0.802519 )
------------------------------------------------------------
Chi-Squared = 48.41164 using 59 PHA bins.
but latest trial 58.2081 gives Chi-Squared = 1.53058
Reduced chi-squared = 0.8644935 for 56 degrees of freedom
Null hypothesis probability = 0.754
Photon flux (15-150 keV) in 31.96 sec: 4.010037E-02 ( -0.0179869 0.0186248 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.14312e-08 ( -3.31914e-08 4.78719e-08 ) ergs/cm2
Band function
Time interval is from 13.000 sec. to 33.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.577014 ( -3.63154 4.02882 )
beta : -9.32012 ( -0.683524 19.3164 )
Epeak [keV] : 45.2443 ( -18.1732 9954.76 )
Norm@50keV : 7.359022E-03 ( -2.33475 1.07961 )
------------------------------------------------------------
Chi-Squared = 49.04776 using 59 PHA bins.
Reduced chi-squared = 0.8917775 for 55 degrees of freedom
Null hypothesis probability = 0.700
Photon flux (15-150 keV) in 31.96 sec: 4.063568E-02 ( -0.0197192 0.0194711 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.84327e-08 ( -4.10226e-08 4.45558e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 18:40:22 EST 2008