batgrbproduct Analysis for Trigger=143840
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): Mon Jan 7 12:16:54 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger143840/GCN5_download_cron
======================================================================
Trigger: 00143840 Segment: 000
BAT Trigger Time: 141987676.416 [s; MET]
Trigger Stop: 141987680.512 [s; MET]
UTC: 2005-07-02T09:01:16.814740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 250.21560444593 Dec: -53.75562495367 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33641
Image Trigger?: NO
Rate S/N Ratio: 10.6301458127346 [ if not an image trigger ]
Image S/N Ratio: 33641
Flight Position: [ source = BAT ]
RA: 250.21560444593 Dec: -53.75562495367 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 250.190486776799 Dec: -53.7536730651425 [deg; J2000]
{ 16h 40m 45.7s , -53d 45' 13.2" }
+/- 3.15021450730915 [arcmin] (estimated 90% radius based on SNR)
+/- 2.17715014525762 [arcmin] (formal 1-sigma fit error)
SNR: 5.90478260046
RA = 16h 40m 45.7s (250.190487 deg.)
Dec = -53d 45' 13" (-53.753673 deg.)
Angular difference between Flight and Ground position is 0.898704 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 5 +/- 1.4142135623731
Measured from: -0.416000008583069
to: 4.58399999141693 [s; relative to TRIGTIME]
T50: 3 +/- 1
Measured from: 0.583999991416931
to: 3.58399999141693 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.58399999141693
to: 4.58399999141693 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.416000008583069
to: 4.58399999141693 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.106071 0.024215 -0.002261 0.001412
0.011839 0.011025 0.009870 0.008804 [error]
Peak 0.017587 0.008410 -0.002560 0.006583
0.005197 0.004933 0.004533 0.003917 [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 3.22e-08 1.09e-08 2.08e-09 4.64e-10 4.55e-08 4.57e-08 erg/cm2
Error 6.39e-09 5.65e-09 2.48e-09 1.17e-09 1.19e-08 1.22e-08 erg/cm2
Peak flux Power-law 2.22e-01 3.96e-02 3.39e-03 3.13e-04 2.65e-01 2.65e-01 ph/cm2/s
Error 8.21e-02 4.48e-02 1.02e-02 3.00e-03 1.17e-01 1.17e-01 ph/cm2/s
Fluence Cutoff-PL 3.22e-08 1.09e-08 2.07e-09 4.61e-10 4.55e-08 4.56e-08 erg/cm2
Error 6.40e-09 5.65e-09 2.48e-09 1.14e-09 1.19e-08 1.22e-08 erg/cm2
Peak flux Cutoff-PL 2.22e-01 3.96e-02 3.38e-03 3.11e-04 2.65e-01 2.65e-01 ph/cm2/s
Error 8.21e-02 4.48e-02 1.02e-02 2.98e-03 1.17e-01 1.17e-01 ph/cm2/s
Fluence Band 3.20e-08 1.12e-08 2.20e-09 5.11e-10 4.54e-08 8.70e-08 erg/cm2
Error 6.29e-09 4.44e-09 4.05e-09 1.16e-09 9.90e-09 0.00e+00 erg/cm2
Peak flux Band 2.29e-01 6.27e-02 5.09e-03 2.02e-02 1.71e+01 2.94e-01 ph/cm2/s
Error 2.41e-02 2.00e+01 1.13e-01 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 4.392 0.927 - - 3.06e-04 3.29e-04 44.482 57
CPL 1.777 0.000 1.9 0.0 3.82e-02 4.46e-02 45.044 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.407 2.317 - - 3.04e-04 5.60e-04 43.568 57
CPL 1.808 2.466 1.6 23.6 4.19e-02 0.00e+00 43.973 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 5.000 -0.416 4.584
T90 5.000 -0.416 4.584
T50 3.000 0.584 3.584
Peak 1.000 3.584 4.584
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
250.1905 -53.7537 0.0326 13.8 95.9 0.1485 5.9 TRIG_00143840
------------------------------------------
Foreground time interval of the image:
-0.416 4.584 (delta_t = 5.000 [sec])
Background time interval of the image:
-10.416 -0.416 (delta_t = 10.000 [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 -0.416 sec. to 4.584 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.39204 ( -0.807114 1.04611 )
Norm@50keV : 3.062718E-04 ( -3.062718E-04 3.507593E-04) )
------------------------------------------------------------
Chi-Squared = 44.48190 using 59 PHA bins.
Reduced chi-squared = 0.7803842 for 57 degrees of freedom
Null hypothesis probability = 0.886
Photon flux (15-150 keV) in 5.000 sec: 0.267948 ( -0.055677 0.055986 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.54897e-08 ( -1.12859e-08 1.24758e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.416 sec. to 4.584 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77719 ( )
Epeak [keV] : 1.89573 ( )
Norm@50keV : 3.817095E-02 ( -1.961516E-02 6.961837E-02) )
------------------------------------------------------------
Chi-Squared = 45.04387 using 59 PHA bins.
but latest trial 0.247883 gives Chi-Squared = 39.4384
Reduced chi-squared = 0.8043548 for 56 degrees of freedom
Null hypothesis probability = 0.853
Photon flux (15-150 keV) in 5.000 sec: 0.267238 ( -0.055204 0.055852 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.54746e-08 ( -1.12831e-08 1.24814e-08 ) ergs/cm2
Band function
Time interval is from -0.416 sec. to 4.584 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.75226 ( -7.47228 0.387729 )
beta : -8.76858 ( -1.04815 0.806883 )
Epeak [keV] : 6.43282 ( -6.33282 9993.57 )
Norm@50keV : 6.409022E-03 ( -0.908897 28.7173 )
------------------------------------------------------------
Chi-Squared = 56.49020 using 59 PHA bins.
Reduced chi-squared = 1.027095 for 55 degrees of freedom
Null hypothesis probability = 0.419
Photon flux (15-150 keV) in 5.000 sec: 0.267882 ( -0.05426 0.054246 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.53794e-08 ( -1.06962e-08 9.10405e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.584 sec. to 4.584 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.40665 ( -1.38267 3.25054 )
Norm@50keV : 3.042751E-04 ( -3.042751E-04 8.153241E-04) )
------------------------------------------------------------
Chi-Squared = 43.56804 using 59 PHA bins.
Reduced chi-squared = 0.7643515 for 57 degrees of freedom
Null hypothesis probability = 0.905
Photon flux (15-150 keV) in 1.000 sec: 0.265339 ( -0.118727 0.115451 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.85754e-09 ( -8.85754e-09 5.83206e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.584 sec. to 4.584 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.80752 ( -1.21935 3.71362 )
Epeak [keV] : 1.56077 ( -1.55077 45.6428 )
Norm@50keV : 4.188344E-02 ( )
------------------------------------------------------------
Chi-Squared = 43.97292 using 59 PHA bins.
but latest trial 0.588171 gives Chi-Squared = 0.265903
but latest trial 52.9694 gives Chi-Squared = 9.25598
Reduced chi-squared = 0.7852307 for 56 degrees of freedom
Null hypothesis probability = 0.878
Photon flux (15-150 keV) in 1.000 sec: 0.265147 ( -0.118771 0.115426 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.8549e-09 ( -4.63779e-09 5.833e-09 ) ergs/cm2
Band function
Time interval is from 3.584 sec. to 4.584 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.76752 ( -2.12702 3.37055 )
beta : -3.90071 ( -3.10344 1.51986 )
Epeak [keV] : 5.38488 ( -5.28488 9994.62 )
Norm@50keV : 7.930389E-03 ( -3.576570E-02 0.116147 )
------------------------------------------------------------
Chi-Squared = 46.74287 using 59 PHA bins.
Reduced chi-squared = 0.8498703 for 55 degrees of freedom
Null hypothesis probability = 0.778
Photon flux (15-150 keV) in 1.000 sec: 17.1243 ( -17.1243 22.8194 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.8494e-09 ( -3.25412e-09 3.2181e-09 ) ergs/cm2
Plot creation:
Mon Jan 7 12:28:37 EST 2008