batgrbproduct Analysis for Trigger=213716
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 1 16:03:51 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger213716/GCN5_download_cron
======================================================================
Trigger: 00213716 Segment: 000
BAT Trigger Time: 171281840 [s; MET]
Trigger Stop: 171281960 [s; MET]
UTC: 2006-06-06T10:17:18.761100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 285.432616693981 Dec: 1.4371560972704 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.01
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.01
Flight Position: [ source = BAT ]
RA: 285.432616693981 Dec: 1.4371560972704 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 285.374939308842 Dec: 1.5585194551334 [deg; J2000]
{ 19h 01m 30.0s , +01d 33' 30.7" }
+/- 6.22086701752023 [arcmin] (estimated 90% radius based on SNR)
+/- 3.97806392257833 [arcmin] (formal 1-sigma fit error)
SNR: 2.23380696411688
RA = 19h 1m 30.0s (285.374939 deg.)
Dec = 1d 33' 31" (1.558519 deg.)
Angular difference between Flight and Ground position is 8.061792 arcmin
Partial Coding Fraction: 0.1835938 [ including projection effects ]
Duration
T90: 120 +/-
Measured from: 0
to: 120 [s; relative to TRIGTIME]
T50: 120 +/-
Measured from: 0
to: 120 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 120 second)
Measured from: 0
to: 120 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 120 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.225448 0.045026 -0.020387 -0.017223
0.064194 0.063447 0.054912 0.047847 [error]
Peak 0.225448 0.045026 -0.020387 -0.017223
0.064194 0.063447 0.054912 0.047847 [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 7.42e-08 2.71e-08 5.66e-09 1.40e-09 1.08e-07 1.10e-07 erg/cm2
Error 3.42e-08 3.12e-08 1.63e-08 1.36e-08 7.08e-08 7.55e-08 erg/cm2
Peak flux Power-law 7.67e-02 1.60e-02 1.68e-03 1.93e-04 9.45e-02 9.46e-02 ph/cm2/s
Error 3.49e-02 1.77e-02 4.59e-03 1.62e-03 4.82e-02 4.84e-02 ph/cm2/s
Fluence Cutoff-PL 8.36e-08 1.04e-08 9.03e-12 8.31e-19 9.39e-08 9.41e-08 erg/cm2
Error 3.78e-08 2.75e-08 1.18e-08 2.32e-11 4.83e-08 4.64e-08 erg/cm2
Peak flux Cutoff-PL 7.66e-02 1.60e-02 1.67e-03 1.91e-04 9.45e-02 9.45e-02 ph/cm2/s
Error 3.49e-02 1.77e-02 4.58e-03 1.60e-03 4.82e-02 4.84e-02 ph/cm2/s
Fluence Band 7.37e-08 2.80e-08 6.12e-09 1.59e-09 1.08e-07 1.28e-07 erg/cm2
Error 3.35e-08 2.42e-06 5.55e-09 1.58e-07 7.37e-06 0.00e+00 erg/cm2
Peak flux Band 7.90e-02 1.35e-02 4.83e-04 3.49e-06 9.31e-02 9.30e-02 ph/cm2/s
Error 3.58e-02 1.13e-02 3.00e-03 1.38e-03 4.57e-02 4.55e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.323 1.945 - - 1.14e-04 2.37e-04 64.650 57
CPL 0.906 0.000 5.9 27.5 1.14e-01 0.00e+00 64.126 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.323 1.945 - - 1.14e-04 2.37e-04 64.650 57
CPL 0.906 0.000 5.9 27.5 1.14e-01 0.00e+00 64.126 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 120.000 0.000 120.000
T90 120.000 0.000 120.000
T50 120.000 0.000 120.000
Peak 120.000 0.000 120.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
285.3749 +1.5585 0.0862 37.5 122.5 0.2930 2.2 TRIG_00213716
------------------------------------------
Foreground time interval of the image:
0.000 33.078 (delta_t = 33.078 [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 33.078 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.32347 ( -1.54127 2.34842 )
Norm@50keV : 1.139629E-04 ( -1.139629E-04 3.603748E-04) )
------------------------------------------------------------
Chi-Squared = 64.64958 using 59 PHA bins.
Reduced chi-squared = 1.134203 for 57 degrees of freedom
Null hypothesis probability = 0.227
Photon flux (15-150 keV) in 33.08 sec: 9.452427E-02 ( -0.0471772 0.0492897 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07759e-07 ( -6.0116e-08 8.1436e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.078 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.906010 ( )
Epeak [keV] : 5.94532 ( -12.3733 42.5486 )
Norm@50keV : 0.113830 ( )
------------------------------------------------------------
Chi-Squared = 64.12639 using 59 PHA bins.
but latest trial 63.4452 gives Chi-Squared = 7.93850
Reduced chi-squared = 1.145114 for 56 degrees of freedom
Null hypothesis probability = 0.213
Photon flux (15-150 keV) in 33.08 sec: 9.446176E-02 ( -0.0471819 0.0492762 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.38701e-08 ( -4.58261e-08 5.08062e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.078 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.27772 ( -0.762790 1.27578 )
beta : -4.57484 ( -2.41229 14.2497 )
Epeak [keV] : 30.2622 ( -30.1622 9969.74 )
Norm@50keV : 1.741519E-03 ( -1.659202E-02 4.784388E-02) )
------------------------------------------------------------
Chi-Squared = 70.83598 using 59 PHA bins.
Reduced chi-squared = 1.287927 for 55 degrees of freedom
Null hypothesis probability = 7.387E-02
Photon flux (15-150 keV) in 33.08 sec: 9.310872E-02 ( -0.0429884 0.0483493 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08056e-07 ( -5.59657e-08 1.46749e-05 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.078 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.32347 ( -1.54127 2.34842 )
Norm@50keV : 1.139629E-04 ( -1.139629E-04 3.603748E-04) )
------------------------------------------------------------
Chi-Squared = 64.64958 using 59 PHA bins.
Reduced chi-squared = 1.134203 for 57 degrees of freedom
Null hypothesis probability = 0.227
Photon flux (15-150 keV) in 33.08 sec: 9.452427E-02 ( -0.0471772 0.0492897 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07759e-07 ( -6.0116e-08 8.1436e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.078 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.906010 ( )
Epeak [keV] : 5.94532 ( -12.3733 42.5486 )
Norm@50keV : 0.113830 ( )
------------------------------------------------------------
Chi-Squared = 64.12639 using 59 PHA bins.
but latest trial 63.4452 gives Chi-Squared = 7.93850
Reduced chi-squared = 1.145114 for 56 degrees of freedom
Null hypothesis probability = 0.213
Photon flux (15-150 keV) in 33.08 sec: 9.446176E-02 ( -0.0471819 0.0492762 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.38701e-08 ( -4.58261e-08 5.08062e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.078 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.27772 ( -0.762790 1.27578 )
beta : -4.57484 ( -2.41229 1.47413 )
Epeak [keV] : 30.2622 ( -30.1622 9969.74 )
Norm@50keV : 1.741519E-03 ( -1.659202E-02 4.784388E-02) )
------------------------------------------------------------
Chi-Squared = 70.83598 using 59 PHA bins.
Reduced chi-squared = 1.287927 for 55 degrees of freedom
Null hypothesis probability = 7.387E-02
Photon flux (15-150 keV) in 33.08 sec: 9.310872E-02 ( -0.0429884 0.0483493 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08056e-07 ( -5.59657e-08 1.46749e-05 ) ergs/cm2
Plot creation:
Tue Jan 1 16:10:39 EST 2008