batgrbproduct Analysis for Trigger=156220
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 12:30:58 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger156220/GCN5_download_cron
======================================================================
Trigger: 00156220 Segment: 000
BAT Trigger Time: 148954128 [s; MET]
Trigger Stop: 148954192 [s; MET]
UTC: 2005-09-21T00:08:48.259940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 276.421809386395 Dec: -37.0337167372723 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33300
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33300
Flight Position: [ source = BAT ]
RA: 276.421809386395 Dec: -37.0337167372723 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 276.497439639522 Dec: -37.0181383499784 [deg; J2000]
{ 18h 25m 59.4s , -37d 01' 05.3" }
+/- 3.98871170716685 [arcmin] (estimated 90% radius based on SNR)
+/- 1.99970650308553 [arcmin] (formal 1-sigma fit error)
SNR: 4.21488787441603
RA = 18h 25m 59.4s (276.497440 deg.)
Dec = -37d 1' 5" (-37.018138 deg.)
Angular difference between Flight and Ground position is 3.741460 arcmin
Partial Coding Fraction: 0.9765625 [ 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 0.072787 0.087876 0.011371 0.008294
0.031579 0.028728 0.025096 0.021836 [error]
Peak 0.072787 0.087876 0.011371 0.008294
0.031579 0.028728 0.025096 0.021836 [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 2.33e-08 2.52e-08 1.94e-08 2.44e-08 7.70e-08 9.34e-08 erg/cm2
Error 1.32e-08 1.35e-08 2.06e-08 5.46e-08 4.60e-08 7.97e-08 erg/cm2
Peak flux Power-law 2.39e-02 1.44e-02 5.54e-03 2.85e-03 4.53e-02 4.67e-02 ph/cm2/s
Error 1.38e-02 1.09e-02 5.73e-03 5.73e-03 2.16e-02 2.26e-02 ph/cm2/s
Fluence Cutoff-PL 2.34e-08 3.25e-08 4.19e-09 1.02e-11 6.01e-08 6.01e-08 erg/cm2
Error 1.24e-08 1.68e-08 1.55e-08 2.78e-08 3.45e-08 5.19e-08 erg/cm2
Peak flux Cutoff-PL 2.31e-02 1.92e-02 1.42e-03 1.91e-06 4.37e-02 4.37e-02 ph/cm2/s
Error 1.27e-02 1.01e-02 4.42e-03 1.55e-03 1.93e-02 1.93e-02 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.378 1.043 - - 2.48e-04 2.16e-04 57.658 57
CPL -2.499 0.000 27.8 9.5 5.85e-01 3.45e+00 55.668 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.378 1.043 - - 2.48e-04 2.16e-04 57.658 57
CPL -2.499 0.000 27.8 9.5 5.85e-01 3.45e+00 55.668 56
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
276.4974 -37.0181 0.0453 13.9 148.2 0.2464 4.2 TRIG_00156220
------------------------------------------
Foreground time interval of the image:
0.000 22.952 (delta_t = 22.952 [sec])
24.000 33.060 (delta_t = 9.060 [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 22.951700
24.000000 33.060500
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.37785 ( -0.885592 1.20101 )
Norm@50keV : 2.479654E-04 ( -2.479654E-04 1.836147E-04) )
------------------------------------------------------------
Chi-Squared = 57.65828 using 59 PHA bins.
Reduced chi-squared = 1.011549 for 57 degrees of freedom
Null hypothesis probability = 0.451
Photon flux (15-150 keV) in 32.01 sec: 4.529315E-02 ( -0.0215404 0.0216024 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.70292e-08 ( -4.20861e-08 4.9902e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 22.951700
24.000000 33.060500
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49912 ( )
Epeak [keV] : 27.7644 ( -7.66107 11.4122 )
Norm@50keV : 0.585093 ( -1.13256 5.75825 )
------------------------------------------------------------
Chi-Squared = 55.66817 using 59 PHA bins.
Reduced chi-squared = 0.9940745 for 56 degrees of freedom
Null hypothesis probability = 0.487
Photon flux (15-150 keV) in 32.01 sec: 4.368290E-02 ( -0.019245 0.0193426 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.00671e-08 ( -2.73401e-08 4.16287e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 22.951700
24.000000 33.060500
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36807 ( -8.63193 5.82945 )
beta : -9.14139 ( )
Epeak [keV] : 19.0450 ( )
Norm@50keV : 1.280062E-03 ( )
------------------------------------------------------------
Chi-Squared = 56.96318 using 59 PHA bins.
Reduced chi-squared = 1.035694 for 55 degrees of freedom
Null hypothesis probability = 0.402
Photon flux (15-150 keV) in 32.01 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 24.000 sec. to 33.060 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.37785 ( -0.885592 1.20101 )
Norm@50keV : 2.479654E-04 ( -2.479654E-04 1.836147E-04) )
------------------------------------------------------------
Chi-Squared = 57.65828 using 59 PHA bins.
Reduced chi-squared = 1.011549 for 57 degrees of freedom
Null hypothesis probability = 0.451
Photon flux (15-150 keV) in 32.01 sec: 4.529315E-02 ( -0.0215404 0.0216024 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.70292e-08 ( -4.20861e-08 4.9902e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.000 sec. to 33.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49912 ( )
Epeak [keV] : 27.7644 ( -7.66107 11.4122 )
Norm@50keV : 0.585093 ( -1.13256 5.75825 )
------------------------------------------------------------
Chi-Squared = 55.66817 using 59 PHA bins.
Reduced chi-squared = 0.9940745 for 56 degrees of freedom
Null hypothesis probability = 0.487
Photon flux (15-150 keV) in 32.01 sec: 4.368290E-02 ( -0.019245 0.0193426 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.00671e-08 ( -2.73401e-08 4.16287e-08 ) ergs/cm2
Band function
Time interval is from 24.000 sec. to 33.060 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36807 ( -8.63193 5.82945 )
beta : -9.14139 ( )
Epeak [keV] : 19.0450 ( )
Norm@50keV : 1.280062E-03 ( )
------------------------------------------------------------
Chi-Squared = 56.96318 using 59 PHA bins.
Reduced chi-squared = 1.035694 for 55 degrees of freedom
Null hypothesis probability = 0.402
Photon flux (15-150 keV) in 32.01 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Jan 9 12:53:10 EST 2008