batgrbproduct Analysis for Trigger=155408
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 11:34:54 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger155408/SDC
======================================================================
Trigger: 00155408 Segment: 000
BAT Trigger Time: 148581352 [s; MET]
Trigger Stop: 148581472 [s; MET]
UTC: 2005-09-16T16:35:52.267640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.992250681767 Dec: -51.4255835934932 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.77
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.77
Flight Position: [ source = BAT ]
RA: 135.992250681767 Dec: -51.4255835934932 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 136.056883156863 Dec: -51.3743992210269 [deg; J2000]
{ 09h 04m 13.7s , -51d 22' 27.8" }
+/- 4.03047182409539 [arcmin] (estimated 90% radius based on SNR)
+/- 2.37384519963774 [arcmin] (formal 1-sigma fit error)
SNR: 4.15263970569892
RA = 9h 4m 13.7s (136.056883 deg.)
Dec = -51d 22' 28" (-51.374399 deg.)
Angular difference between Flight and Ground position is 3.909577 arcmin
Partial Coding Fraction: 0.421875 [ including projection effects ]
Duration
T90: 64 +/- 22.6274169979695
Measured from: 5
to: 69 [s; relative to TRIGTIME]
T50: 16 +/- 22.6274169979695
Measured from: 21
to: 37 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 44.5
to: 45.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: 5
to: 69 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.398841 0.620311 0.339905 0.113908
0.063929 0.064768 0.056978 0.051278 [error]
Peak 0.184856 0.175899 0.127436 0.037812
0.032308 0.032848 0.028924 0.025908 [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 1.62e-07 2.55e-07 3.03e-07 7.01e-07 9.24e-07 1.42e-06 erg/cm2
Error 3.29e-08 3.33e-08 5.60e-08 2.67e-07 1.33e-07 3.18e-07 erg/cm2
Peak flux Power-law 1.29e-01 9.97e-02 5.16e-02 3.85e-02 2.98e-01 3.19e-01 ph/cm2/s
Error 3.66e-02 1.87e-02 1.57e-02 2.30e-02 5.64e-02 6.01e-02 ph/cm2/s
Fluence Cutoff-PL 1.45e-07 2.82e-07 3.08e-07 2.11e-07 8.63e-07 9.53e-07 erg/cm2
Error 3.95e-08 4.67e-08 6.58e-08 4.02e-07 1.55e-07 4.42e-07 erg/cm2
Peak flux Cutoff-PL 1.29e-01 9.98e-02 5.16e-02 3.83e-02 2.98e-01 3.19e-01 ph/cm2/s
Error 3.66e-02 1.87e-02 1.58e-02 2.29e-02 5.64e-02 6.00e-02 ph/cm2/s
Fluence Band 1.38e-07 2.90e-07 2.96e-07 3.98e-07 8.72e-07 1.12e-06 erg/cm2
Error 4.03e-08 4.77e-08 6.22e-08 3.44e-07 1.43e-07 3.83e-07 erg/cm2
Peak flux Band 1.29e-01 9.98e-02 5.16e-02 3.83e-02 2.98e-01 3.19e-01 ph/cm2/s
Error 3.89e-02 1.87e-02 1.58e-02 2.29e-02 5.64e-02 6.53e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.749 0.226 - - 1.56e-03 2.18e-04 52.396 57
CPL 0.876 1.245 59.0 4978.2 4.65e-03 1.50e-02 50.541 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.950 0.365 - - 2.03e-03 4.69e-04 62.012 57
CPL 1.810 0.000 63.6 0.0 2.40e-03 5.24e-03 62.058 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: 33.664000 sec.
T50 in the 50-300 keV band: 12.096000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 5.000 69.000
T90 64.000 5.000 69.000
T50 16.000 21.000 37.000
Peak 1.000 44.500 45.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
136.0569 -51.3744 0.0465 41.4 -145.2 1.5203 4.2 TRIG_00155408
------------------------------------------
Foreground time interval of the image:
5.000 69.000 (delta_t = 64.000 [sec])
Background time interval of the image:
-2.595 5.000 (delta_t = 7.595 [sec])
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 5.000 sec. to 69.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74916 ( -0.222217 0.229188 )
Norm@50keV : 1.564112E-03 ( -2.194701E-04 2.161302E-04) )
------------------------------------------------------------
Chi-Squared = 52.39632 using 59 PHA bins.
Reduced chi-squared = 0.9192337 for 57 degrees of freedom
Null hypothesis probability = 0.648
Photon flux (15-150 keV) in 64.00 sec: 0.211430 ( -0.027878 0.027935 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.23565e-07 ( -1.32333e-07 1.34355e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.000 sec. to 69.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.875676 ( -1.49044 0.998676 )
Epeak [keV] : 58.9520 ( -15.2768 9941.05 )
Norm@50keV : 4.645674E-03 ( -4.645674E-03 2.537397E-02) )
------------------------------------------------------------
Chi-Squared = 50.54089 using 59 PHA bins.
but latest trial 1.87435 gives Chi-Squared = 2.76714
Reduced chi-squared = 0.9025158 for 56 degrees of freedom
Null hypothesis probability = 0.681
Photon flux (15-150 keV) in 64.00 sec: 0.204786 ( -0.029663 0.029326 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.63392e-07 ( -1.53837e-07 1.55258e-07 ) ergs/cm2
Band function
Time interval is from 5.000 sec. to 69.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.452045 ( -1.58083 2.88981 )
beta : -2.30654 ( -7.69346 0.597268 )
Epeak [keV] : 50.1589 ( -30.4493 528.498 )
Norm@50keV : 8.440110E-03 ( -8.440110E-03 0.974423 )
------------------------------------------------------------
Chi-Squared = 49.65913 using 59 PHA bins.
Reduced chi-squared = 0.9028932 for 55 degrees of freedom
Null hypothesis probability = 0.678
Photon flux (15-150 keV) in 64.00 sec: 0.203549 ( -0.029688 0.029013 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.71994e-07 ( -1.43354e-07 1.43206e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 37.000 sec. to 53.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95048 ( -0.347227 0.382507 )
Norm@50keV : 2.033186E-03 ( -4.810888E-04 4.563886E-04) )
------------------------------------------------------------
Chi-Squared = 62.01237 using 59 PHA bins.
Reduced chi-squared = 1.087936 for 57 degrees of freedom
Null hypothesis probability = 0.302
Photon flux (15-150 keV) in 16.00 sec: 0.298240 ( -0.056349 0.056401 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99378e-07 ( -6.58656e-08 6.75408e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 37.000 sec. to 53.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81044 ( )
Epeak [keV] : 63.5558 ( )
Norm@50keV : 2.398195E-03 ( -5.016612E-04 9.978490E-03) )
------------------------------------------------------------
Chi-Squared = 62.05789 using 59 PHA bins.
Reduced chi-squared = 1.108177 for 56 degrees of freedom
Null hypothesis probability = 0.269
Photon flux (15-150 keV) in 16.00 sec: 0.298145 ( -0.056331 0.056383 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99485e-07 ( -6.58976e-08 6.75184e-08 ) ergs/cm2
Band function
Time interval is from 37.000 sec. to 53.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.85452 ( -6.32228 8.66384 )
beta : -8.51624 ( -0.382002 0.347477 )
Epeak [keV] : 71.1135 ( -71.0135 9928.89 )
Norm@50keV : 2.277151E-03 ( -6.539506E-02 6.203273E-02) )
------------------------------------------------------------
Chi-Squared = 62.03443 using 59 PHA bins.
Reduced chi-squared = 1.127899 for 55 degrees of freedom
Null hypothesis probability = 0.240
Photon flux (15-150 keV) in 16.00 sec: 0.298146 ( -0.056331 0.05637 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99838e-07 ( -5.61568e-08 5.62368e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 11:55:15 EST 2008