batgrbproduct Analysis for Trigger=153355
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 8 19:07:16 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger153355/GCN5_download_cron
======================================================================
Trigger: 00153355 Segment: 000
BAT Trigger Time: 147418416 [s; MET]
Trigger Stop: 147418480 [s; MET]
UTC: 2005-09-03T05:33:36.291480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 41.5982693388621 Dec: 13.3446942001763 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33312
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33312
Flight Position: [ source = BAT ]
RA: 41.5982693388621 Dec: 13.3446942001763 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 41.6102046465099 Dec: 13.4177813330101 [deg; J2000]
{ 02h 46m 26.4s , +13d 25' 04.0" }
+/- 4.45500085330969 [arcmin] (estimated 90% radius based on SNR)
+/- 2.94520435340064 [arcmin] (formal 1-sigma fit error)
SNR: 3.59909212633262
RA = 2h 46m 26.4s (41.610205 deg.)
Dec = 13d 25' 4" (13.417781 deg.)
Angular difference between Flight and Ground position is 4.440223 arcmin
Partial Coding Fraction: 0.6015625 [ 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 0.109365 0.128971 -0.013752 0.048992
0.035090 0.034973 0.029083 0.024261 [error]
Peak 0.109365 0.128971 -0.013752 0.048992
0.035090 0.034973 0.029083 0.024261 [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 4.25e-08 3.74e-08 2.25e-08 2.05e-08 1.11e-07 1.23e-07 erg/cm2
Error 1.60e-08 1.76e-08 2.08e-08 4.07e-08 5.29e-08 7.58e-08 erg/cm2
Peak flux Power-law 4.26e-02 2.10e-02 6.32e-03 2.42e-03 7.12e-02 7.23e-02 ph/cm2/s
Error 1.63e-02 9.47e-03 6.49e-03 4.40e-03 2.52e-02 2.60e-02 ph/cm2/s
Fluence Cutoff-PL 4.31e-08 4.55e-08 6.38e-09 3.77e-11 9.49e-08 9.54e-08 erg/cm2
Error 1.81e-08 2.45e-08 1.97e-08 2.82e-08 4.54e-08 6.15e-08 erg/cm2
Peak flux Cutoff-PL 4.20e-02 2.61e-02 2.04e-03 6.40e-06 7.02e-02 7.02e-02 ph/cm2/s
Error 1.84e-02 1.34e-02 5.43e-03 3.12e-03 2.38e-02 2.37e-02 ph/cm2/s
Fluence Band 4.09e-08 3.85e-08 2.35e-08 2.18e-08 1.14e-07 1.36e-07 erg/cm2
Error 1.29e-08 1.73e-08 1.70e-08 2.12e-08 4.88e-08 0.00e+00 erg/cm2
Peak flux Band 4.38e-02 2.16e-02 6.25e-03 2.28e-03 7.30e-02 7.40e-02 ph/cm2/s
Error 1.68e-02 8.83e-03 5.86e-03 4.06e-03 2.49e-02 2.54e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.722 0.877 - - 3.12e-04 2.71e-04 68.855 57
CPL -0.241 3.374 22.0 16.5 3.98e-02 1.04e+00 67.546 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.722 0.877 - - 3.12e-04 2.71e-04 68.855 57
CPL -0.241 2.505 22.0 16.5 3.98e-02 1.04e+00 67.546 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
41.6102 +13.4178 0.0528 22.4 88.7 0.2883 3.6 TRIG_00153355
------------------------------------------
Foreground time interval of the image:
0.000 33.034 (delta_t = 33.034 [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 33.034 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.72221 ( -0.725454 1.02932 )
Norm@50keV : 3.123430E-04 ( -3.123430E-04 2.292122E-04) )
------------------------------------------------------------
Chi-Squared = 68.85464 using 59 PHA bins.
Reduced chi-squared = 1.207976 for 57 degrees of freedom
Null hypothesis probability = 0.135
Photon flux (15-150 keV) in 33.03 sec: 7.122160E-02 ( -0.0251076 0.0252593 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11144e-07 ( -4.86661e-08 5.72291e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.034 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.241462 ( -2.75854 3.98956 )
Epeak [keV] : 21.9518 ( -21.9418 10.9888 )
Norm@50keV : 3.981571E-02 ( -3.981571E-02 2.03398 )
------------------------------------------------------------
Chi-Squared = 67.54586 using 59 PHA bins.
but latest trial 1.98329 gives Chi-Squared = 0.618301
Reduced chi-squared = 1.206176 for 56 degrees of freedom
Null hypothesis probability = 0.139
Photon flux (15-150 keV) in 33.03 sec: 7.020382E-02 ( -0.023681 0.0238383 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.49295e-08 ( -3.48823e-08 5.58481e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.034 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43051 ( -8.56949 6.43051 )
beta : -3.43521 ( -6.56479 1.36884 )
Epeak [keV] : 16.1284 ( -16.0284 9983.87 )
Norm@50keV : 2.088203E-03 ( -0.159299 96.2032 )
------------------------------------------------------------
Chi-Squared = 68.34425 using 59 PHA bins.
Reduced chi-squared = 1.242623 for 55 degrees of freedom
Null hypothesis probability = 0.107
Photon flux (15-150 keV) in 33.03 sec: 7.298443E-02 ( -0.0249922 0.024879 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14379e-07 ( -4.70024e-08 5.06439e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.034 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.72221 ( -0.725454 1.02932 )
Norm@50keV : 3.123430E-04 ( -3.123430E-04 2.292122E-04) )
------------------------------------------------------------
Chi-Squared = 68.85464 using 59 PHA bins.
Reduced chi-squared = 1.207976 for 57 degrees of freedom
Null hypothesis probability = 0.135
Photon flux (15-150 keV) in 33.03 sec: 7.122160E-02 ( -0.0251076 0.0252593 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11144e-07 ( -4.86661e-08 5.72291e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.034 sec.
Parameters : value lower 90% higher 90%
Photon index: -0.241462 ( -2.75854 2.25200 )
Epeak [keV] : 21.9518 ( -21.9418 10.9888 )
Norm@50keV : 3.981571E-02 ( -3.981571E-02 2.03398 )
------------------------------------------------------------
Chi-Squared = 67.54586 using 59 PHA bins.
but latest trial 2.01921 gives Chi-Squared = 3.86834
but latest trial 1.98329 gives Chi-Squared = 0.618301
Reduced chi-squared = 1.206176 for 56 degrees of freedom
Null hypothesis probability = 0.139
Photon flux (15-150 keV) in 33.03 sec: 7.020382E-02 ( -0.023681 0.0238383 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.49295e-08 ( -3.48823e-08 5.58481e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.034 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43051 ( -8.56949 6.43051 )
beta : -3.43521 ( -6.56479 1.36884 )
Epeak [keV] : 16.1284 ( -16.0284 9983.87 )
Norm@50keV : 2.088203E-03 ( -0.159299 96.2032 )
------------------------------------------------------------
Chi-Squared = 68.34425 using 59 PHA bins.
Reduced chi-squared = 1.242623 for 55 degrees of freedom
Null hypothesis probability = 0.107
Photon flux (15-150 keV) in 33.03 sec: 7.298443E-02 ( -0.0249922 0.024879 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14379e-07 ( -4.70024e-08 5.06439e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 19:12:07 EST 2008