batgrbproduct Analysis for Trigger=219237
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 Jan 3 16:36:37 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger219237/SDC
======================================================================
Trigger: 00219237 Segment: 000
BAT Trigger Time: 174633032 [s; MET]
Trigger Stop: 174634536 [s; MET]
UTC: 2006-07-15T05:10:30.682280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 166.094509062147 Dec: 38.171736707798 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.5
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.5
Flight Position: [ source = BAT ]
RA: 166.094509062147 Dec: 38.171736707798 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 166.140308587934 Dec: 38.2992352473045 [deg; J2000]
{ 11h 04m 33.7s , +38d 17' 57.2" }
+/- 4.62488614654475 [arcmin] (estimated 90% radius based on SNR)
+/- 3.34361312263645 [arcmin] (formal 1-sigma fit error)
SNR: 3.41172508475616
RA = 11h 4m 33.7s (166.140309 deg.)
Dec = 38d 17' 57" (38.299235 deg.)
Angular difference between Flight and Ground position is 7.948591 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 1504 +/-
Measured from: 0
to: 1504 [s; relative to TRIGTIME]
T50: 1504 +/-
Measured from: 0
to: 1504 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1504 second)
Measured from: 0
to: 1504 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1504 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.467982 0.150975 0.010838 0.003218
0.100563 0.101800 0.090785 0.081730 [error]
Peak 0.467982 0.150975 0.010838 0.003218
0.100563 0.101800 0.090785 0.081730 [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 1.56e-07 6.10e-08 1.39e-08 3.81e-09 2.33e-07 2.35e-07 erg/cm2
Error 4.68e-08 4.72e-08 2.56e-08 1.69e-08 1.06e-07 1.13e-07 erg/cm2
Peak flux Power-law 1.21e-02 2.71e-03 3.09e-04 3.89e-05 1.51e-02 1.51e-02 ph/cm2/s
Error 3.62e-03 2.44e-03 5.48e-04 1.56e-04 5.18e-03 5.20e-03 ph/cm2/s
Fluence Cutoff-PL 1.64e-07 6.05e-08 3.42e-09 1.32e-11 2.29e-07 2.29e-07 erg/cm2
Error 5.13e-08 5.93e-08 2.35e-08 2.33e-09 7.41e-08 1.08e-07 erg/cm2
Peak flux Cutoff-PL 1.21e-02 2.71e-03 3.08e-04 3.86e-05 1.51e-02 1.51e-02 ph/cm2/s
Error 3.61e-03 2.44e-03 5.47e-04 1.55e-04 5.18e-03 5.20e-03 ph/cm2/s
Fluence Band 1.54e-07 6.24e-08 1.47e-08 4.22e-09 2.35e-07 2.25e-07 erg/cm2
Error 4.61e-08 3.31e-08 9.61e-09 3.67e-09 9.07e-08 0.00e+00 erg/cm2
Peak flux Band 1.21e-02 2.71e-03 3.08e-04 1.62e-05 1.54e-02 1.51e-02 ph/cm2/s
Error 3.84e-03 2.44e-03 5.47e-04 4.72e-03 5.20e-03 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.340 1.416 - - 1.76e-05 3.04e-05 80.557 57
CPL 1.468 2.637 4.9 19.4 2.48e-03 1.85e+00 80.074 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.340 1.416 - - 1.76e-05 3.04e-05 80.557 57
CPL 1.468 2.222 4.9 19.4 2.48e-03 1.85e+00 80.074 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 1504.000 0.000 1504.000
T90 1504.000 0.000 1504.000
T50 1504.000 0.000 1504.000
Peak 1504.000 0.000 1504.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
166.1403 +38.2992 0.0562 14.6 -89.3 0.7496 3.4 TRIG_00219237
------------------------------------------
Foreground time interval of the image:
465.000 483.053 (delta_t = 18.053 [sec])
491.000 543.021 (delta_t = 52.021 [sec])
594.000 963.065 (delta_t = 369.065 [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
465.000000 483.052700
491.000000 543.020600
594.000000 963.065300
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.33982 ( -1.28234 1.54973 )
Norm@50keV : 1.764431E-05 ( -1.764431E-05 4.324864E-05) )
------------------------------------------------------------
Chi-Squared = 80.55741 using 59 PHA bins.
Reduced chi-squared = 1.413288 for 57 degrees of freedom
Null hypothesis probability = 2.168E-02
Photon flux (15-150 keV) in 439.1 sec: 1.513803E-02 ( -0.00514147 0.00521966 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32988e-07 ( -9.5427e-08 1.17325e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
465.000000 483.052700
491.000000 543.020600
594.000000 963.065300
Photon index: 1.46784 ( -3.93309 1.34071 )
Epeak [keV] : 4.89570 ( -4.88570 33.9822 )
Norm@50keV : 2.479727E-03 ( -2.479727E-03 3.70297 )
------------------------------------------------------------
Chi-Squared = 80.07426 using 59 PHA bins.
but latest trial -2.89638 gives Chi-Squared = 12.7070
but latest trial 35.7683 gives Chi-Squared = 14.3597
but latest trial 3.70537 gives Chi-Squared = 2.73535
Reduced chi-squared = 1.429897 for 56 degrees of freedom
Null hypothesis probability = 1.908E-02
Photon flux (15-150 keV) in 439.1 sec: 1.512893E-02 ( -0.00514091 0.00521821 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28879e-07 ( -8.62928e-08 6.18889e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
465.000000 483.052700
491.000000 543.020600
594.000000 963.065300
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.85675 ( -7.60012 0.271563 )
beta : -7.91212 ( -1.72466 14.1332 )
Epeak [keV] : 3.67132 ( -3.57132 9996.33 )
Norm@50keV : 3.815751E-04 ( -4.197118E-02 2.72408 )
------------------------------------------------------------
Chi-Squared = 83.75571 using 59 PHA bins.
Reduced chi-squared = 1.522831 for 55 degrees of freedom
Null hypothesis probability = 7.492E-03
Photon flux (15-150 keV) in 439.1 sec: 1.542693E-02 ( -0.00484968 0.00458368 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.34606e-07 ( -7.01734e-08 1.11146e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 594.000 sec. to 963.065 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.33982 ( -1.28234 1.54973 )
Norm@50keV : 1.764431E-05 ( -1.764431E-05 4.324864E-05) )
------------------------------------------------------------
Chi-Squared = 80.55741 using 59 PHA bins.
Reduced chi-squared = 1.413288 for 57 degrees of freedom
Null hypothesis probability = 2.168E-02
Photon flux (15-150 keV) in 439.1 sec: 1.513803E-02 ( -0.00514147 0.00521966 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32988e-07 ( -9.5427e-08 1.17325e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 594.000 sec. to 963.065 sec.
Photon index: 1.46784 ( -3.93309 0.511370 )
Epeak [keV] : 4.89570 ( -4.88570 33.9822 )
Norm@50keV : 2.479727E-03 ( -2.479727E-03 3.70297 )
------------------------------------------------------------
Chi-Squared = 80.07426 using 59 PHA bins.
but latest trial -2.89638 gives Chi-Squared = 12.7070
but latest trial 35.7683 gives Chi-Squared = 14.3597
but latest trial 3.70537 gives Chi-Squared = 2.73535
Reduced chi-squared = 1.429897 for 56 degrees of freedom
Null hypothesis probability = 1.908E-02
Photon flux (15-150 keV) in 439.1 sec: 1.512893E-02 ( -0.00514091 0.00521821 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28879e-07 ( -8.62928e-08 6.18889e-08 ) ergs/cm2
Band function
Time interval is from 594.000 sec. to 963.065 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.85675 ( -7.60012 0.271563 )
beta : -7.91212 ( -1.72466 14.1332 )
Epeak [keV] : 3.67132 ( -3.57132 9996.33 )
Norm@50keV : 3.815751E-04 ( -4.197118E-02 2.72408 )
------------------------------------------------------------
Chi-Squared = 83.75571 using 59 PHA bins.
Reduced chi-squared = 1.522831 for 55 degrees of freedom
Null hypothesis probability = 7.492E-03
Photon flux (15-150 keV) in 439.1 sec: 1.542693E-02 ( -0.00484968 0.00458368 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.34606e-07 ( -7.01734e-08 1.11146e-07 ) ergs/cm2
Plot creation:
Thu Jan 3 16:58:00 EST 2008