batgrbproduct Analysis for Trigger=239899
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 2 12:54:20 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger239899/GCN5_download_cron
======================================================================
Trigger: 00239899 Segment: 000
BAT Trigger Time: 185815350.592 [s; MET]
Trigger Stop: 185815350.848 [s; MET]
UTC: 2006-11-21T15:22:29.006780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 147.251722976049 Dec: -13.1827450313483 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.08
Image Trigger?: NO
Rate S/N Ratio: 16.7928556237467 [ if not an image trigger ]
Image S/N Ratio: 8.08
Flight Position: [ source = BAT ]
RA: 147.251722976049 Dec: -13.1827450313483 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 147.232892235962 Dec: -13.1849860608288 [deg; J2000]
{ 09h 48m 55.9s , -13d 11' 05.9" }
+/- 0.905731522563441 [arcmin] (estimated 90% radius based on SNR)
+/- 0.284017634922518 [arcmin] (formal 1-sigma fit error)
SNR: 35.0386762313259
RA = 9h 48m 55.9s (147.232892 deg.)
Dec = -13d 11' 6" (-13.184986 deg.)
Angular difference between Flight and Ground position is 1.108252 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 81.2480000257492 +/- 46.1274845779442
Measured from: 8.8759999871254
to: 90.1240000128746 [s; relative to TRIGTIME]
T50: 7.4839999973774 +/- 0.109251996718258
Measured from: 67.6920000016689
to: 75.1759999990463 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 74.4799999892712
to: 75.4799999892712 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.84400001168251
to: 121.447999984026 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.134245 8.045967 6.432284 1.635837
0.059839 0.062962 0.056632 0.044268 [error]
Peak 0.595545 0.939479 0.973363 0.289990
0.011050 0.013765 0.014651 0.010840 [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 1.64e-06 3.23e-06 4.96e-06 1.66e-05 1.39e-05 2.65e-05 erg/cm2
Error 6.10e-08 6.88e-08 7.68e-08 6.60e-07 2.01e-07 6.59e-07 erg/cm2
Peak flux Power-law 4.79e+00 6.39e+00 6.28e+00 1.11e+01 2.11e+01 2.85e+01 ph/cm2/s
Error 2.34e-01 1.82e-01 1.31e-01 5.52e-01 4.57e-01 5.95e-01 ph/cm2/s
Fluence Cutoff-PL 1.59e-06 3.23e-06 5.00e-06 1.54e-05 1.38e-05 2.45e-05 erg/cm2
Error 9.13e-08 6.93e-08 1.00e-07 1.84e-06 2.00e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.77e+00 6.39e+00 6.28e+00 1.10e+01 2.11e+01 2.84e+01 ph/cm2/s
Error 2.34e-01 1.82e-01 1.31e-01 5.50e-01 4.57e-01 5.93e-01 ph/cm2/s
Fluence Band 1.58e-06 3.22e-06 4.99e-06 1.54e-05 1.38e-05 2.43e-05 erg/cm2
Error 9.04e-08 6.90e-08 1.01e-07 1.84e-06 2.13e-07 0.00e+00 erg/cm2
Peak flux Band 4.59e+00 6.38e+00 6.37e+00 9.98e+00 2.09e+01 2.73e+01 ph/cm2/s
Error 3.51e-01 1.84e-01 1.81e-01 1.38e+00 5.08e-01 1.54e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.382 0.031 - - 1.17e-02 1.82e-04 28.059 57
CPL 1.298 0.105 529.2 5000.0 1.26e-02 1.04e-03 27.174 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.026 0.040 - - 1.83e-01 3.79e-03 38.252 57
CPL 0.927 0.161 691.7 5000.0 2.00e-01 2.35e-02 36.815 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: 27.648000 sec.
T50 in the 50-300 keV band: 7.104000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 122.292 -0.844 121.448
T90 81.248 8.876 90.124
T50 7.484 67.692 75.176
Peak 1.000 74.480 75.480
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
147.2329 -13.1850 0.0055 9.0 166.2 1.1797 35.0 TRIG_00239899
------------------------------------------
Foreground time interval of the image:
-0.844 10.809 (delta_t = 11.653 [sec])
Background time interval of the image:
-239.592 -0.844 (delta_t = 238.748 [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 -0.844 sec. to 121.448 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38241 ( -3.059828E-02 3.054070E-02) )
Norm@50keV : 1.169739E-02 ( -1.825318E-04 1.819981E-04) )
------------------------------------------------------------
Chi-Squared = 28.05898 using 59 PHA bins.
Reduced chi-squared = 0.4922628 for 57 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 122.3 sec: 1.41895 ( -0.02703 0.02719 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38738e-05 ( -2.00694e-07 2.00939e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.844 sec. to 121.448 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.29799 ( -0.122436 8.717859E-02) )
Epeak [keV] : 529.166 ( -529.156 9470.83 )
Norm@50keV : 1.261601E-02 ( -6.621489E-04 1.423246E-03) )
------------------------------------------------------------
Chi-Squared = 27.17429 using 59 PHA bins.
but latest trial 1.38148 gives Chi-Squared = 0.886673
but latest trial 1.196554E-02 gives Chi-Squared = 3.57949
Reduced chi-squared = 0.4852552 for 56 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 122.3 sec: 1.40779 ( -0.01673 0.01672 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38286e-05 ( -1.99961e-07 1.99961e-07 ) ergs/cm2
Band function
Time interval is from -0.844 sec. to 121.448 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09109 ( -8.90891 6.08388 )
beta : -1.38242 ( -3.052974E-02 3.061426E-02) )
Epeak [keV] : 41.6278 ( -4.33398 0.374023 )
Norm@50keV : 2.300161E-02 ( -1.822077E-04 1.818361E-04) )
------------------------------------------------------------
Chi-Squared = 28.05901 using 59 PHA bins.
Reduced chi-squared = 0.5101637 for 55 degrees of freedom
Null hypothesis probability = 0.999
Photon flux (15-150 keV) in 122.3 sec: 1.41870 ( -0.0229 0.0205 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38178e-05 ( -2.20018e-07 2.05709e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 74.480 sec. to 75.480 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02596 ( -4.014337E-02 4.003179E-02) )
Norm@50keV : 0.182785 ( -3.794104E-03 3.780410E-03) )
------------------------------------------------------------
Chi-Squared = 38.25178 using 59 PHA bins.
Reduced chi-squared = 0.6710839 for 57 degrees of freedom
Null hypothesis probability = 0.973
Photon flux (15-150 keV) in 1.000 sec: 21.0754 ( -0.4559 0.4583 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95868e-06 ( -4.0707e-08 4.0882e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 74.480 sec. to 75.480 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.926503 ( -0.195631 0.126224 )
Epeak [keV] : 691.727 ( -691.717 9308.27 )
Norm@50keV : 0.199908 ( -9.312406E-03 3.768179E-02) )
------------------------------------------------------------
Chi-Squared = 36.81542 using 59 PHA bins.
but latest trial 1.02384 gives Chi-Squared = 1.31250
but latest trial 0.190594 gives Chi-Squared = 0.735325
Reduced chi-squared = 0.6574182 for 56 degrees of freedom
Null hypothesis probability = 0.978
Photon flux (15-150 keV) in 1.000 sec: 21.0654 ( -0.4561 0.4579 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95222e-06 ( -4.2437e-08 4.1259e-08 ) ergs/cm2
Band function
Time interval is from 74.480 sec. to 75.480 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.827129 ( -9.17287 5.82253 )
beta : -1.02596 ( -4.002881E-02 4.014724E-02) )
Epeak [keV] : 55.2221 ( -9999.89 7.812500E-03) )
Norm@50keV : 0.311149 ( -3.796637E-03 3.785536E-03) )
------------------------------------------------------------
Chi-Squared = 38.25179 using 59 PHA bins.
Reduced chi-squared = 0.6954871 for 55 degrees of freedom
Null hypothesis probability = 0.958
Photon flux (15-150 keV) in 1.000 sec: 20.9045 ( -0.5088 0.5065 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95081e-06 ( -4.2423e-08 4.2128e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 13:13:13 EST 2008