batgrbproduct Analysis for Trigger=252593
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 17:42:43 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger252593/SDC
======================================================================
Trigger: 00252593 Segment: 000
BAT Trigger Time: 188453464 [s; MET]
Trigger Stop: 188453528 [s; MET]
UTC: 2006-12-22T04:11:02.350780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 105.357290328966 Dec: -25.8555478617164 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.83
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.83
Flight Position: [ source = BAT ]
RA: 105.357290328966 Dec: -25.8555478617164 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 105.354928817218 Dec: -25.8661513801757 [deg; J2000]
{ 07h 01m 25.2s , -25d 51' 58.1" }
+/- 1.3114063189005 [arcmin] (estimated 90% radius based on SNR)
+/- 0.423279295607933 [arcmin] (formal 1-sigma fit error)
SNR: 20.6501056153599
RA = 7h 1m 25.2s (105.354929 deg.)
Dec = -25d 51' 58" (-25.866151 deg.)
Angular difference between Flight and Ground position is 0.648861 arcmin
Partial Coding Fraction: 0.15625 [ including projection effects ]
Duration
T90: 40 +/- 6.17724340223664
Measured from: 38.6960000097752
to: 78.6960000097752 [s; relative to TRIGTIME]
T50: 19.2000000178814 +/- 2.503373745358
Measured from: 47.0160000026226
to: 66.216000020504 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 59.1559999883175
to: 60.1559999883175 [s; relative to TRIGTIME]
Total Fluence
Measured from: 35.1119999885559
to: 84.9040000140667 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.415233 1.593626 0.878566 0.122996
0.093200 0.094815 0.080827 0.067855 [error]
Peak 0.079980 0.060466 0.029928 0.015012
0.013641 0.013565 0.011573 0.009879 [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 4.85e-07 6.69e-07 6.81e-07 1.26e-06 2.24e-06 3.10e-06 erg/cm2
Error 5.43e-08 4.90e-08 7.82e-08 2.93e-07 1.83e-07 3.71e-07 erg/cm2
Peak flux Power-law 8.10e-01 5.14e-01 2.10e-01 1.17e-01 1.59e+00 1.65e+00 ph/cm2/s
Error 2.28e-01 1.22e-01 8.63e-02 8.70e-02 3.61e-01 3.77e-01 ph/cm2/s
Fluence Cutoff-PL 4.44e-07 7.22e-07 6.85e-07 4.72e-07 2.12e-06 2.36e-06 erg/cm2
Error 6.25e-08 6.41e-08 8.81e-08 3.80e-07 2.01e-07 4.34e-07 erg/cm2
Peak flux Cutoff-PL 7.71e-01 6.20e-01 1.67e-01 1.18e-02 1.57e+00 1.57e+00 ph/cm2/s
Error 2.48e-01 1.68e-01 1.44e-01 6.33e-02 3.56e-01 3.57e-01 ph/cm2/s
Fluence Band 4.40e-07 7.18e-07 6.82e-07 4.72e-07 2.12e-06 2.39e-06 erg/cm2
Error 6.19e-08 6.40e-08 8.79e-08 3.79e-07 2.01e-07 5.82e-07 erg/cm2
Peak flux Band 7.72e-01 6.20e-01 1.67e-01 1.18e-02 1.57e+00 1.57e+00 ph/cm2/s
Error 2.00e-01 1.52e-01 5.59e-02 9.59e-02 3.47e-01 3.52e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.973 0.134 - - 4.88e-03 4.12e-04 67.882 57
CPL 1.296 0.565 46.7 15.7 1.15e-02 9.15e-03 62.869 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.289 0.416 - - 9.17e-03 2.93e-03 87.473 57
CPL 0.635 2.486 29.1 21.1 1.07e-01 1.38e+01 84.730 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: 31.168000 sec.
T50 in the 50-300 keV band: 17.664000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 49.792 35.112 84.904
T90 40.000 38.696 78.696
T50 19.200 47.016 66.216
Peak 1.000 59.156 60.156
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
105.3549 -25.8662 0.0093 37.2 104.1 4.0811 20.7 TRIG_00252593
------------------------------------------
Foreground time interval of the image:
35.112 80.405 (delta_t = 45.293 [sec])
Background time interval of the image:
-239.000 35.112 (delta_t = 274.112 [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 35.112 sec. to 84.904 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97321 ( -0.132454 0.136288 )
Norm@50keV : 4.882177E-03 ( -4.147957E-04 4.092767E-04) )
------------------------------------------------------------
Chi-Squared = 67.88243 using 59 PHA bins.
Reduced chi-squared = 1.190920 for 57 degrees of freedom
Null hypothesis probability = 0.153
Photon flux (15-150 keV) in 49.79 sec: 0.723456 ( -0.054488 0.054582 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.23873e-06 ( -1.82177e-07 1.8386e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 35.112 sec. to 84.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29564 ( -0.602680 0.527616 )
Epeak [keV] : 46.6549 ( -12.4570 18.8899 )
Norm@50keV : 1.147829E-02 ( -5.475210E-03 1.283280E-02) )
------------------------------------------------------------
Chi-Squared = 62.86897 using 59 PHA bins.
Reduced chi-squared = 1.122660 for 56 degrees of freedom
Null hypothesis probability = 0.246
Photon flux (15-150 keV) in 49.79 sec: 0.702982 ( -0.056754 0.056794 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12481e-06 ( -1.98468e-07 2.0383e-07 ) ergs/cm2
Band function
Time interval is from 35.112 sec. to 84.904 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29774 ( -0.525688 0.604149 )
beta : -9.09008 ( -0.909916 7.09254 )
Epeak [keV] : 46.6561 ( -12.4649 18.8817 )
Norm@50keV : 1.144650E-02 ( -5.878723E-03 1.286907E-02) )
------------------------------------------------------------
Chi-Squared = 62.86912 using 59 PHA bins.
Reduced chi-squared = 1.143075 for 55 degrees of freedom
Null hypothesis probability = 0.218
Photon flux (15-150 keV) in 49.79 sec: 0.703013 ( -0.056789 0.056767 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12333e-06 ( -1.99304e-07 2.02581e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 59.176 sec. to 60.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28923 ( -0.387061 0.444644 )
Norm@50keV : 9.170931E-03 ( -2.955567E-03 2.911862E-03) )
------------------------------------------------------------
Chi-Squared = 87.47340 using 59 PHA bins.
Reduced chi-squared = 1.534621 for 57 degrees of freedom
Null hypothesis probability = 5.834E-03
Photon flux (15-150 keV) in 0.9600 sec: 1.59310 ( -0.36108 0.36108 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.39079e-08 ( -2.2372e-08 2.36178e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 59.176 sec. to 60.136 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.635174 ( -3.63517 1.33677 )
Epeak [keV] : 29.0810 ( -27.2440 14.8726 )
Norm@50keV : 0.106571 ( -0.106571 27.4959 )
------------------------------------------------------------
Chi-Squared = 84.73018 using 59 PHA bins.
but latest trial 2.00133 gives Chi-Squared = 4.21743
but latest trial 1.78238 gives Chi-Squared = 4.03069
Reduced chi-squared = 1.513039 for 56 degrees of freedom
Null hypothesis probability = 7.882E-03
Photon flux (15-150 keV) in 0.9600 sec: 1.56909 ( -0.35446 0.35711 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.41977e-08 ( -2.13562e-08 2.44634e-08 ) ergs/cm2
Band function
Time interval is from 59.176 sec. to 60.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.825380 ( -15.0000 3.814697E-06) )
beta : -9.27612 ( -1.66375 13.0289 )
Epeak [keV] : 29.1645 ( -6.81681 2.66452 )
Norm@50keV : 7.779181E-02 ( -1564.30 7810.93 )
------------------------------------------------------------
Chi-Squared = 84.76604 using 59 PHA bins.
Reduced chi-squared = 1.541201 for 55 degrees of freedom
Null hypothesis probability = 6.113E-03
Photon flux (15-150 keV) in 0.9600 sec: 1.56901 ( -0.34824 0.34667 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.93771e-08 ( -2.12296e-08 2.11944e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 18:12:04 EST 2008