batgrbproduct Analysis for Trigger=147029
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 17:22:16 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger147029/GCN5_download_cron
======================================================================
Trigger: 00147029 Segment: 000
BAT Trigger Time: 143637270.4 [s; MET]
Trigger Stop: 143637274.496 [s; MET]
UTC: 2005-07-21T11:14:30.767080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 262.943847888148 Dec: -33.7749882945236 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33615
Image Trigger?: NO
Rate S/N Ratio: 8.83176086632785 [ if not an image trigger ]
Image S/N Ratio: 33615
Flight Position: [ source = BAT ]
RA: 262.943847888148 Dec: -33.7749882945236 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 262.963479520933 Dec: -33.8219295503706 [deg; J2000]
{ 17h 31m 51.2s , -33d 49' 18.9" }
+/- 2.97354753315384 [arcmin] (estimated 90% radius based on SNR)
+/- 1.98042359075297 [arcmin] (formal 1-sigma fit error)
SNR: 6.4122640981444
RA = 17h 31m 51.2s (262.963480 deg.)
Dec = -33d 49' 19" (-33.821930 deg.)
Angular difference between Flight and Ground position is 2.981719 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 3.20000001788139 +/- 0.976917587802653
Measured from: 0.783999979496002
to: 3.9839999973774 [s; relative to TRIGTIME]
T50: 1.66400000452995 +/- 1.12729058066035
Measured from: 1.61599999666214
to: 3.28000000119209 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.74799999594688
to: 3.74799999594688 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0160000026226044
to: 4.17599999904633 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.101938 0.016441 -0.007300 0.000046
0.011338 0.009535 0.007787 0.006386 [error]
Peak 0.036387 0.008887 -0.004830 0.003154
0.005403 0.004576 0.003667 0.003137 [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 2.84e-08 8.13e-09 1.26e-09 2.22e-10 3.80e-08 3.80e-08 erg/cm2
Error 5.87e-09 4.13e-09 1.61e-09 5.19e-10 9.60e-09 9.70e-09 erg/cm2
Peak flux Power-law 3.59e-01 7.15e-02 7.04e-03 7.57e-04 4.38e-01 4.38e-01 ph/cm2/s
Error 9.14e-02 3.89e-02 9.44e-03 1.90e-03 1.17e-01 1.17e-01 ph/cm2/s
Fluence Cutoff-PL 3.08e-08 5.75e-09 3.55e-11 6.80e-16 3.66e-08 3.66e-08 erg/cm2
Error 6.75e-09 4.44e-09 1.17e-09 1.23e-10 8.67e-09 8.49e-09 erg/cm2
Peak flux Cutoff-PL 3.58e-01 7.15e-02 7.03e-03 7.51e-04 4.37e-01 4.38e-01 ph/cm2/s
Error 9.13e-02 3.89e-02 9.43e-03 1.88e-03 1.17e-01 1.17e-01 ph/cm2/s
Fluence Band 2.81e-08 8.04e-09 1.24e-09 2.19e-10 3.93e-08 3.70e-08 erg/cm2
Error 5.79e-09 2.96e-09 1.22e-09 9.55e-09 8.19e-09 0.00e+00 erg/cm2
Peak flux Band 3.58e-01 7.25e-02 7.28e-03 7.98e-04 4.39e-01 4.39e-01 ph/cm2/s
Error 9.10e-02 1.62e-02 1.47e-02 4.33e-03 1.13e-01 1.14e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.531 0.877 - - 2.82e-04 2.58e-04 44.754 57
CPL 1.712 0.000 2.1 7.8 6.78e-02 1.43e+02 43.159 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.178 1.003 - - 6.14e-04 5.87e-04 71.373 57
CPL 1.087 2.276 6.7 8.5 1.81e-01 1.22e+02 69.739 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 4.160 0.016 4.176
T90 3.200 0.784 3.984
T50 1.664 1.616 3.280
Peak 1.000 2.748 3.748
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
262.9635 -33.8219 0.0299 9.7 125.9 0.1175 6.4 TRIG_00147029
------------------------------------------
Foreground time interval of the image:
0.016 4.176 (delta_t = 4.160 [sec])
Background time interval of the image:
-60.400 0.016 (delta_t = 60.416 [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 0.016 sec. to 4.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.53085 ( -0.619436 1.13371 )
Norm@50keV : 2.824022E-04 ( -2.824022E-04 2.335714E-04) )
------------------------------------------------------------
Chi-Squared = 44.75351 using 59 PHA bins.
Reduced chi-squared = 0.7851492 for 57 degrees of freedom
Null hypothesis probability = 0.881
Photon flux (15-150 keV) in 4.160 sec: 0.277518 ( -0.059814 0.060054 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79739e-08 ( -9.282e-09 9.91062e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.016 sec. to 4.176 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71245 ( )
Epeak [keV] : 2.05268 ( -8.73523 6.82125 )
Norm@50keV : 6.777741E-02 ( -1.60157 285.230 )
------------------------------------------------------------
Chi-Squared = 43.15881 using 59 PHA bins.
but latest trial 15.4027 gives Chi-Squared = 5.90400
Reduced chi-squared = 0.7706929 for 56 degrees of freedom
Null hypothesis probability = 0.896
Photon flux (15-150 keV) in 4.160 sec: 0.282072 ( -0.058375 0.058343 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65638e-08 ( -8.18268e-09 9.16336e-09 ) ergs/cm2
Band function
Time interval is from 0.016 sec. to 4.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46924 ( -0.294533 0.443869 )
beta : -9.15491 ( -0.845095 4.96791 )
Epeak [keV] : 5.04134 ( -7.50938 8.90839 )
Norm@50keV : 4.636559E-02 ( -0.617847 246.201 )
------------------------------------------------------------
Chi-Squared = 46.52349 using 59 PHA bins.
Reduced chi-squared = 0.8458816 for 55 degrees of freedom
Null hypothesis probability = 0.785
Photon flux (15-150 keV) in 4.160 sec: 0.277892 ( -0.057329 0.059472 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.92961e-08 ( -9.74255e-09 9.35717e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.768 sec. to 3.728 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.17837 ( -0.682201 1.32300 )
Norm@50keV : 6.144602E-04 ( -6.144602E-04 5.591372E-04) )
------------------------------------------------------------
Chi-Squared = 71.37349 using 59 PHA bins.
Reduced chi-squared = 1.252167 for 57 degrees of freedom
Null hypothesis probability = 9.535E-02
Photon flux (15-150 keV) in 0.9600 sec: 0.437709 ( -0.116237 0.11712 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43496e-08 ( -4.37952e-09 4.8048e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.768 sec. to 3.728 sec.
Epeak [keV] : 6.68449 ( -6.67449 10.2843 )
Norm@50keV : 0.181303 ( -0.181303 243.442 )
------------------------------------------------------------
Chi-Squared = 69.73936 using 59 PHA bins.
but latest trial -3.91838 gives Chi-Squared = 18.1540
but latest trial 1.80189 gives Chi-Squared = 9.725189E-02
but latest trial 15.8673 gives Chi-Squared = 0.766525
but latest trial 243.623 gives Chi-Squared = 42.1112
Reduced chi-squared = 1.245346 for 56 degrees of freedom
Null hypothesis probability = 0.103
Photon flux (15-150 keV) in 0.9600 sec: 0.437426 ( -0.116201 0.117077 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41751e-08 ( -3.91507e-09 4.12944e-09 ) ergs/cm2
Band function
Time interval is from 2.768 sec. to 3.728 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43056 ( -0.197222 0.663490 )
beta : -6.97051 ( -3.921986E-02 6.14892 )
Epeak [keV] : 5.38931 ( -5.37781 10.3214 )
Norm@50keV : 7.036784E-02 ( -0.368601 191703. )
------------------------------------------------------------
Chi-Squared = 70.09168 using 59 PHA bins.
Reduced chi-squared = 1.274394 for 55 degrees of freedom
Null hypothesis probability = 8.267E-02
Photon flux (15-150 keV) in 0.9600 sec: 0.438892 ( -0.112504 0.11388 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42388e-08 ( 0 0 ) ergs/cm2
Plot creation:
Mon Jan 7 17:29:30 EST 2008