batgrbproduct Analysis for Trigger=306869
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): Thu Mar 20 12:37:09 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger306869/GCN5_download_cron
======================================================================
Trigger: 00306869 Segment: 000
BAT Trigger Time: 227690184 [s; MET]
Trigger Stop: 227690248 [s; MET]
UTC: 2008-03-20T07:16:21.343760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 19.6986376691473 Dec: 63.7644947903169 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.16
Flight Position: [ source = BAT ]
RA: 19.6986376691473 Dec: 63.7644947903169 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 19.731267823421 Dec: 63.8266751633481 [deg; J2000]
{ 01h 18m 55.5s , +63d 49' 36.0" }
+/- 2.97787502363589 [arcmin] (estimated 90% radius based on SNR)
+/- 1.80177322439157 [arcmin] (formal 1-sigma fit error)
SNR: 6.39895625369035
RA = 1h 18m 55.5s (19.731268 deg.)
Dec = 63d 49' 36" (63.826675 deg.)
Angular difference between Flight and Ground position is 3.829677 arcmin
Partial Coding Fraction: 1 [ 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 0.210635 0.144388 0.019611 0.042991
0.034627 0.034530 0.030661 0.027045 [error]
Peak 0.210635 0.144388 0.019611 0.042991
0.034627 0.034530 0.030661 0.027045 [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 6.36e-08 5.08e-08 2.74e-08 2.15e-08 1.51e-07 1.64e-07 erg/cm2
Error 1.54e-08 1.74e-08 1.92e-08 2.88e-08 4.95e-08 6.54e-08 erg/cm2
Peak flux Power-law 3.30e-02 1.48e-02 3.99e-03 1.33e-03 5.26e-02 5.31e-02 ph/cm2/s
Error 8.14e-03 4.84e-03 3.56e-03 1.83e-03 1.24e-02 1.27e-02 ph/cm2/s
Fluence Cutoff-PL 6.77e-08 5.13e-08 3.78e-09 6.21e-12 1.23e-07 1.23e-07 erg/cm2
Error 1.72e-08 2.29e-08 2.00e-08 2.09e-08 3.09e-08 5.71e-08 erg/cm2
Peak flux Cutoff-PL 3.44e-02 1.57e-02 6.43e-04 5.63e-07 5.07e-02 5.07e-02 ph/cm2/s
Error 8.91e-03 6.44e-03 2.88e-03 7.55e-04 1.16e-02 1.16e-02 ph/cm2/s
Fluence Band 6.24e-08 5.32e-08 2.87e-08 2.25e-08 1.51e-07 1.81e-07 erg/cm2
Error 1.41e-08 9.80e-09 1.13e-08 1.05e-08 3.60e-08 4.64e-08 erg/cm2
Peak flux Band 3.51e-02 1.48e-02 1.12e-03 8.73e-05 5.09e-02 5.54e-02 ph/cm2/s
Error 9.00e-03 5.39e-03 2.28e-03 9.28e-04 1.14e-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 2.893 0.614 - - 2.07e-04 1.09e-04 43.389 57
CPL 0.247 2.487 17.3 9.2 1.96e-02 0.00e+00 41.802 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.893 0.614 - - 2.07e-04 1.09e-04 43.389 57
CPL 0.247 2.514 17.3 9.2 1.96e-02 0.00e+00 41.802 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
19.7313 +63.8267 0.0301 0.2 104.7 0.4377 6.4 TRIG_00306869
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.89301 ( -0.542734 0.685347 )
Norm@50keV : 2.065145E-04 ( -1.013801E-04 1.159171E-04) )
------------------------------------------------------------
Chi-Squared = 43.38884 using 59 PHA bins.
Reduced chi-squared = 0.7612076 for 57 degrees of freedom
Null hypothesis probability = 0.908
Photon flux (15-150 keV) in 64.00 sec: 5.260334E-02 ( -0.0123468 0.0124357 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51495e-07 ( -4.61094e-08 5.2951e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.247474 ( -3.24747 1.72674 )
Epeak [keV] : 17.2933 ( -9.94572 8.45050 )
Norm@50keV : 1.955544E-02 ( )
------------------------------------------------------------
Chi-Squared = 41.80201 using 59 PHA bins.
but latest trial 1.98035 gives Chi-Squared = 0.852200
but latest trial 11.9255 gives Chi-Squared = 0.433018
Reduced chi-squared = 0.7464644 for 56 degrees of freedom
Null hypothesis probability = 0.921
Photon flux (15-150 keV) in 64.00 sec: 5.069556E-02 ( -0.0115173 0.0116869 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22801e-07 ( -3.20506e-08 2.97888e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46409 ( -8.53591 0.728704 )
beta : -8.32878 ( -1.67122 18.3282 )
Epeak [keV] : 10.3071 ( -10.2071 11.0100 )
Norm@50keV : 2.291619E-03 ( -6.085944E-04 220968. )
------------------------------------------------------------
Chi-Squared = 42.33394 using 59 PHA bins.
Reduced chi-squared = 0.7697080 for 55 degrees of freedom
Null hypothesis probability = 0.894
Photon flux (15-150 keV) in 64.00 sec: 5.085968E-02 ( -0.0113542 0.0113478 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51326e-07 ( -3.4121e-08 3.78586e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.89301 ( -0.542734 0.685347 )
Norm@50keV : 2.065145E-04 ( -1.013801E-04 1.159171E-04) )
------------------------------------------------------------
Chi-Squared = 43.38884 using 59 PHA bins.
Reduced chi-squared = 0.7612076 for 57 degrees of freedom
Null hypothesis probability = 0.908
Photon flux (15-150 keV) in 64.00 sec: 5.260334E-02 ( -0.0123468 0.0124357 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51495e-07 ( -4.61094e-08 5.2951e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.247474 ( -3.24747 1.78015 )
Epeak [keV] : 17.2933 ( -9.94572 8.45050 )
Norm@50keV : 1.955544E-02 ( )
------------------------------------------------------------
Chi-Squared = 41.80201 using 59 PHA bins.
but latest trial 11.9255 gives Chi-Squared = 0.433018
Reduced chi-squared = 0.7464644 for 56 degrees of freedom
Null hypothesis probability = 0.921
Photon flux (15-150 keV) in 64.00 sec: 5.069556E-02 ( -0.0115173 0.0116869 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22801e-07 ( -3.20506e-08 2.97888e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46409 ( -8.53591 0.728704 )
beta : -8.32878 ( -1.67122 18.3282 )
Epeak [keV] : 10.3071 ( -10.2071 11.0100 )
Norm@50keV : 2.291619E-03 ( -6.085944E-04 220968. )
------------------------------------------------------------
Chi-Squared = 42.33394 using 59 PHA bins.
Reduced chi-squared = 0.7697080 for 55 degrees of freedom
Null hypothesis probability = 0.894
Photon flux (15-150 keV) in 64.00 sec: 5.085968E-02 ( -0.0113542 0.0113478 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51326e-07 ( -3.4121e-08 3.78586e-08 ) ergs/cm2
Plot creation:
Thu Mar 20 12:46:19 EDT 2008