batgrbproduct Analysis for Trigger=234516
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 08:46:53 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger234516/SDC
======================================================================
Trigger: 00234516 Segment: 000
BAT Trigger Time: 182924348.48 [s; MET]
Trigger Stop: 182924352.576 [s; MET]
UTC: 2006-10-19T04:19:06.964420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 91.6165852177475 Dec: 29.572562393964 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.37
Image Trigger?: NO
Rate S/N Ratio: 11.916375287813 [ if not an image trigger ]
Image S/N Ratio: 7.37
Flight Position: [ source = BAT ]
RA: 91.6165852177475 Dec: 29.572562393964 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 91.6490441213318 Dec: 29.5570407706596 [deg; J2000]
{ 06h 06m 35.8s , +29d 33' 25.3" }
+/- 3.96974195166324 [arcmin] (estimated 90% radius based on SNR)
+/- 1.99076277209939 [arcmin] (formal 1-sigma fit error)
SNR: 4.24369046302428
RA = 6h 6m 35.8s (91.649044 deg.)
Dec = 29d 33' 25" (29.557041 deg.)
Angular difference between Flight and Ground position is 1.933086 arcmin
Partial Coding Fraction: 0.05810547 [ including projection effects ]
Duration
T90: 180.27199998498 +/- 6.405797365844
Measured from: -167.752000004053
to: 12.5199999809265 [s; relative to TRIGTIME]
T50: 167.823999971151 +/- 160.05074496643
Measured from: -162.151999980211
to: 5.67199999094009 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.59600001573563
to: 4.59600001573563 [s; relative to TRIGTIME]
Total Fluence
Measured from: -169.223999977112
to: 15.1920000016689 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.570797 1.536731 1.084652 0.089759
0.266810 0.269607 0.237149 0.212401 [error]
Peak 0.097269 0.079148 0.083394 -0.010064
0.025499 0.024737 0.020872 0.016257 [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 5.51e-07 7.32e-07 7.13e-07 1.24e-06 2.40e-06 3.24e-06 erg/cm2
Error 1.44e-07 1.36e-07 2.32e-07 8.12e-07 5.32e-07 1.07e-06 erg/cm2
Peak flux Power-law 1.07e+00 7.32e-01 3.27e-01 2.02e-01 2.23e+00 2.34e+00 ph/cm2/s
Error 4.46e-01 2.06e-01 1.56e-01 1.84e-01 6.41e-01 6.57e-01 ph/cm2/s
Fluence Cutoff-PL 5.46e-07 7.44e-07 7.12e-07 9.83e-07 2.38e-06 2.93e-06 erg/cm2
Error 1.53e-07 1.63e-07 2.38e-07 6.19e-07 5.66e-07 1.28e-06 erg/cm2
Peak flux Cutoff-PL 1.07e+00 7.33e-01 3.27e-01 2.01e-01 2.23e+00 2.33e+00 ph/cm2/s
Error 4.46e-01 2.06e-01 1.56e-01 1.83e-01 6.41e-01 6.57e-01 ph/cm2/s
Fluence Band 5.46e-07 7.40e-07 7.00e-07 1.18e-06 2.38e-06 3.28e-06 erg/cm2
Error 1.37e-07 1.63e-07 2.40e-07 5.44e-07 7.09e-07 0.00e+00 erg/cm2
Peak flux Band 1.07e+00 7.33e-01 3.27e-01 2.01e-01 2.23e+00 2.33e+00 ph/cm2/s
Error 4.46e-01 2.06e-01 1.24e-01 1.83e-01 6.41e-01 6.57e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.038 0.361 - - 1.41e-03 3.35e-04 63.032 57
CPL 1.704 0.000 39.4 4999.9 2.15e-03 5.59e-03 63.077 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.165 0.588 - - 1.37e-02 5.07e-03 57.152 57
CPL 2.397 0.914 161.6 4941.6 1.06e-02 3.88e-02 57.053 56
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: 8.256000 sec.
T50 in the 50-300 keV band: 4.608000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 184.416 -169.224 15.192
T90 180.272 -167.752 12.520
T50 167.824 -162.152 5.672
Peak 1.000 3.596 4.596
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
91.6490 +29.5570 0.0453 40.1 70.4 3.8975 4.2 TRIG_00234516
------------------------------------------
Foreground time interval of the image:
-169.224 15.192 (delta_t = 184.416 [sec])
Background time interval of the image:
-239.480 -169.224 (delta_t = 70.256 [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 -169.224 sec. to 15.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03780 ( -0.342472 0.380134 )
Norm@50keV : 1.410313E-03 ( -3.433048E-04 3.264130E-04) )
------------------------------------------------------------
Chi-Squared = 63.03248 using 59 PHA bins.
Reduced chi-squared = 1.105833 for 57 degrees of freedom
Null hypothesis probability = 0.272
Photon flux (15-150 keV) in 184.4 sec: 0.215308 ( -0.039622 0.039641 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.40412e-06 ( -5.2436e-07 5.40384e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -169.224 sec. to 15.192 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70394 ( )
Epeak [keV] : 39.4007 ( -27.8322 9971.88 )
Norm@50keV : 2.147055E-03 ( -1.713024E-03 9.457178E-03) )
------------------------------------------------------------
Chi-Squared = 63.07657 using 59 PHA bins.
but latest trial 14.1994 gives Chi-Squared = 9.948730E-03
Reduced chi-squared = 1.126367 for 56 degrees of freedom
Null hypothesis probability = 0.240
Photon flux (15-150 keV) in 184.4 sec: 0.214467 ( -0.040331 0.039782 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37893e-06 ( -5.73408e-07 5.58603e-07 ) ergs/cm2
Band function
Time interval is from -169.224 sec. to 15.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60663 ( -13.1206 1.87944 )
beta : -8.60423 ( -0.468618 0.364351 )
Epeak [keV] : 40.2797 ( -19.6916 31.2205 )
Norm@50keV : 2.454568E-03 ( -29.3616 884.294 )
------------------------------------------------------------
Chi-Squared = 63.15540 using 59 PHA bins.
Reduced chi-squared = 1.148280 for 55 degrees of freedom
Null hypothesis probability = 0.210
Photon flux (15-150 keV) in 184.4 sec: 0.214452 ( -0.03967 0.04017 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37714e-06 ( -5.42525e-07 5.4481e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.592 sec. to 4.600 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16503 ( -0.510952 0.665659 )
Norm@50keV : 1.373508E-02 ( -5.412887E-03 4.718001E-03) )
------------------------------------------------------------
Chi-Squared = 57.15249 using 59 PHA bins.
Reduced chi-squared = 1.002675 for 57 degrees of freedom
Null hypothesis probability = 0.469
Photon flux (15-150 keV) in 1.008 sec: 2.23291 ( -0.64079 0.64101 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29389e-07 ( -4.13487e-08 4.17876e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.592 sec. to 4.600 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.39679 ( -1.74428 8.301401E-02) )
Epeak [keV] : 161.587 ( -44.7362 9838.41 )
Norm@50keV : 1.060161E-02 ( -1.060161E-02 6.704903E-02) )
------------------------------------------------------------
Chi-Squared = 57.05252 using 59 PHA bins.
Reduced chi-squared = 1.018795 for 56 degrees of freedom
Null hypothesis probability = 0.436
Photon flux (15-150 keV) in 1.008 sec: 2.23212 ( -0.64061 0.64081 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29561e-07 ( -4.15263e-08 4.1704e-08 ) ergs/cm2
Band function
Time interval is from 3.592 sec. to 4.600 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.98979 ( -7.87071 7.12929 )
beta : -8.21899 ( -0.665509 0.510848 )
Epeak [keV] : 8.20110 ( -8.10110 9991.80 )
Norm@50keV : 1.539928E-02 ( -0.735572 0.641479 )
------------------------------------------------------------
Chi-Squared = 57.32389 using 59 PHA bins.
Reduced chi-squared = 1.042253 for 55 degrees of freedom
Null hypothesis probability = 0.389
Photon flux (15-150 keV) in 1.008 sec: 2.23209 ( -0.64059 0.64082 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29971e-07 ( -3.86527e-08 3.65571e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 09:00:25 EST 2008