batgrbproduct Analysis for Trigger=200696
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): Mon Dec 31 13:53:25 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger200696/GCN5_download_cron
======================================================================
Trigger: 00200696 Segment: 000
BAT Trigger Time: 163332024 [s; MET]
Trigger Stop: 163332136 [s; MET]
UTC: 2006-03-06T10:00:22.945480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 281.434562237123 Dec: 0.814267692158471 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.81
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.81
Flight Position: [ source = BAT ]
RA: 281.434562237123 Dec: 0.814267692158471 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 281.408016422164 Dec: 0.8031913058581 [deg; J2000]
{ 18h 45m 37.9s , +00d 48' 11.5" }
+/- 4.81355316861336 [arcmin] (estimated 90% radius based on SNR)
+/- 2.34854833405486 [arcmin] (formal 1-sigma fit error)
SNR: 3.2223096757792
RA = 18h 45m 37.9s (281.408016 deg.)
Dec = 0d 48' 11" (0.803191 deg.)
Angular difference between Flight and Ground position is 1.725692 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 112 +/-
Measured from: 0
to: 112 [s; relative to TRIGTIME]
T50: 112 +/-
Measured from: 0
to: 112 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 112 second)
Measured from: 0
to: 112 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 112 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.094706 0.081186 0.036318 -0.010063
0.031936 0.030052 0.025136 0.020509 [error]
Peak 0.094706 0.081186 0.036318 -0.010063
0.031936 0.030052 0.025136 0.020509 [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 2.84e-08 3.24e-08 2.65e-08 3.63e-08 1.01e-07 1.25e-07 erg/cm2
Error 1.32e-08 1.39e-08 2.06e-08 6.18e-08 4.95e-08 8.76e-08 erg/cm2
Peak flux Power-law 2.81e-02 1.78e-02 7.30e-03 4.05e-03 5.53e-02 5.73e-02 ph/cm2/s
Error 1.33e-02 7.43e-03 5.49e-03 6.34e-03 2.11e-02 2.23e-02 ph/cm2/s
Fluence Cutoff-PL 2.76e-08 3.61e-08 2.31e-08 7.22e-09 9.22e-08 9.50e-08 erg/cm2
Error 2.08e-08 1.91e-08 2.37e-08 5.84e-08 5.11e-08 8.81e-08 erg/cm2
Peak flux Cutoff-PL 2.71e-02 1.98e-02 6.56e-03 1.05e-03 5.43e-02 5.45e-02 ph/cm2/s
Error 2.06e-02 1.03e-02 6.70e-03 6.02e-03 2.12e-02 2.28e-02 ph/cm2/s
Fluence Band 2.75e-08 3.57e-08 2.30e-08 2.01e-08 9.52e-08 1.05e-07 erg/cm2
Error 1.43e-08 1.70e-08 2.03e-08 5.84e-08 4.39e-08 4.74e-08 erg/cm2
Peak flux Band 2.71e-02 1.98e-02 6.54e-03 1.03e-03 5.43e-02 5.45e-02 ph/cm2/s
Error 1.07e-02 1.00e-02 6.69e-03 3.51e-03 2.12e-02 2.06e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.288 0.840 - - 3.18e-04 2.51e-04 60.615 57
CPL 1.390 2.854 24.7 5000.0 1.18e-03 3.59e-01 60.367 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.288 0.840 - - 3.18e-04 2.51e-04 60.615 57
CPL 1.390 2.578 24.7 5000.0 1.18e-03 3.59e-01 60.367 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 112.000 0.000 112.000
T90 112.000 0.000 112.000
T50 112.000 0.000 112.000
Peak 112.000 0.000 112.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
281.4080 +0.8032 0.0595 1.2 122.6 0.2011 3.2 TRIG_00200696
------------------------------------------
Foreground time interval of the image:
0.000 33.108 (delta_t = 33.108 [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 33.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28795 ( -0.709279 0.970389 )
Norm@50keV : 3.183668E-04 ( -3.183668E-04 1.838137E-04) )
------------------------------------------------------------
Chi-Squared = 60.61494 using 59 PHA bins.
Reduced chi-squared = 1.063420 for 57 degrees of freedom
Null hypothesis probability = 0.347
Photon flux (15-150 keV) in 33.11 sec: 5.526675E-02 ( -0.0210741 0.0210945 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0052e-07 ( -4.66566e-08 5.23297e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38989 ( -4.38989 1.31803 )
Epeak [keV] : 24.6902 ( -24.6802 9975.31 )
Norm@50keV : 1.178947E-03 ( -1.178947E-03 0.715899 )
------------------------------------------------------------
Chi-Squared = 60.36692 using 59 PHA bins.
Reduced chi-squared = 1.077981 for 56 degrees of freedom
Null hypothesis probability = 0.321
Photon flux (15-150 keV) in 33.11 sec: 5.430879E-02 ( -0.0210928 0.0212647 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.21657e-08 ( -4.46217e-08 5.75382e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50947 ( -8.49053 6.50947 )
beta : -8.85487 ( -1.14513 7.24300 )
Epeak [keV] : 23.4938 ( -23.3938 9976.51 )
Norm@50keV : 9.782082E-04 ( -9.782083E-04 27.6225 )
------------------------------------------------------------
Chi-Squared = 60.37116 using 59 PHA bins.
Reduced chi-squared = 1.097657 for 55 degrees of freedom
Null hypothesis probability = 0.288
Photon flux (15-150 keV) in 33.11 sec: 5.429117E-02 ( -0.0211923 0.0213053 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.51999e-08 ( -4.72592e-08 4.04574e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28795 ( -0.709279 0.970389 )
Norm@50keV : 3.183668E-04 ( -3.183668E-04 1.838137E-04) )
------------------------------------------------------------
Chi-Squared = 60.61494 using 59 PHA bins.
Reduced chi-squared = 1.063420 for 57 degrees of freedom
Null hypothesis probability = 0.347
Photon flux (15-150 keV) in 33.11 sec: 5.526675E-02 ( -0.0210741 0.0210945 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0052e-07 ( -4.66566e-08 5.23297e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.108 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38989 ( -4.38989 0.766020 )
Epeak [keV] : 24.6902 ( -24.6802 9975.31 )
Norm@50keV : 1.178947E-03 ( -1.178947E-03 0.715899 )
------------------------------------------------------------
Chi-Squared = 60.36692 using 59 PHA bins.
but latest trial 2.07466 gives Chi-Squared = 0.519920
Reduced chi-squared = 1.077981 for 56 degrees of freedom
Null hypothesis probability = 0.321
Photon flux (15-150 keV) in 33.11 sec: 5.430879E-02 ( -0.0210928 0.0212647 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.21657e-08 ( -4.46217e-08 5.75382e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50947 ( -8.49053 6.50947 )
beta : -8.85487 ( -1.14513 7.24300 )
Epeak [keV] : 23.4938 ( -23.3938 9976.51 )
Norm@50keV : 9.782082E-04 ( -9.782083E-04 27.6225 )
------------------------------------------------------------
Chi-Squared = 60.37116 using 59 PHA bins.
Reduced chi-squared = 1.097657 for 55 degrees of freedom
Null hypothesis probability = 0.288
Photon flux (15-150 keV) in 33.11 sec: 5.429117E-02 ( -0.0211923 0.0213053 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.51999e-08 ( -4.72592e-08 4.04574e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 13:58:20 EST 2007