batgrbproduct Analysis for Trigger=154632
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): Thu Jan 10 19:12:59 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger154632/SDC
======================================================================
Trigger: 00154632 Segment: 000
BAT Trigger Time: 148149424 [s; MET]
Trigger Stop: 148149488 [s; MET]
UTC: 2005-09-11T16:37:04.276620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.202175974494 Dec: -10.5354543317715 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.68
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 16.68
Flight Position: [ source = BAT ]
RA: 244.202175974494 Dec: -10.5354543317715 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.216751346847 Dec: -10.5421267041302 [deg; J2000]
{ 16h 16m 52.0s , -10d 32' 31.7" }
+/- 1.79179246327606 [arcmin] (estimated 90% radius based on SNR)
+/- 0.871830746629365 [arcmin] (formal 1-sigma fit error)
SNR: 13.2214412850673
RA = 16h 16m 52.0s (244.216751 deg.)
Dec = -10d 32' 32" (-10.542127 deg.)
Angular difference between Flight and Ground position is 0.948409 arcmin
Partial Coding Fraction: 0.4492188 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.986813 0.230043 -0.041447 0.019091
0.086061 0.090126 0.088959 0.078369 [error]
Peak 1.986813 0.230043 -0.041447 0.019091
0.086061 0.090126 0.088959 0.078369 [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 7.10e-07 1.14e-07 8.59e-09 6.90e-10 8.33e-07 8.33e-07 erg/cm2
Error 9.24e-08 3.90e-08 6.94e-09 1.02e-09 1.09e-07 1.09e-07 erg/cm2
Peak flux Power-law 3.90e-01 3.66e-02 1.37e-03 5.35e-05 4.28e-01 4.28e-01 ph/cm2/s
Error 5.17e-02 1.19e-02 1.39e-03 8.36e-05 5.45e-02 5.45e-02 ph/cm2/s
Fluence Cutoff-PL 7.10e-07 1.14e-07 8.56e-09 6.84e-10 8.33e-07 8.33e-07 erg/cm2
Error 9.23e-08 3.90e-08 6.93e-09 1.01e-09 1.09e-07 1.09e-07 erg/cm2
Peak flux Cutoff-PL 3.89e-01 2.33e-02 1.59e-05 7.23e-12 4.28e-01 4.27e-01 ph/cm2/s
Error 1.58e-02 1.06e-03 6.12e-07 5.52e-02 5.45e-02 0.00e+00 ph/cm2/s
Fluence Band 7.21e-07 1.02e-07 6.17e-09 3.18e-10 8.38e-07 8.31e-07 erg/cm2
Error 9.57e-08 3.32e-08 1.06e-07 1.19e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.08e-01 2.56e-02 3.55e-04 4.98e-06 4.34e-01 4.34e-01 ph/cm2/s
Error 5.55e-02 1.10e-02 1.44e-03 5.20e-06 5.50e-02 5.49e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.584 0.653 - - 1.57e-04 1.24e-04 54.551 57
CPL 1.472 0.000 2.5 5.5 5.46e-01 7.20e+02 52.747 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.584 0.653 - - 1.57e-04 1.24e-04 54.551 57
CPL 1.472 0.000 2.5 5.5 5.46e-01 7.20e+02 52.747 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.2168 -10.5421 0.0145 33.9 34.3 2.2888 13.2 TRIG_00154632
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.58352 ( -0.475610 0.830022 )
Norm@50keV : 1.568883E-04 ( -1.568883E-04 9.143045E-05) )
------------------------------------------------------------
Chi-Squared = 54.55139 using 59 PHA bins.
Reduced chi-squared = 0.9570420 for 57 degrees of freedom
Null hypothesis probability = 0.567
Photon flux (15-150 keV) in 64.00 sec: 0.427584 ( -0.054532 0.054535 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.33491e-07 ( -1.08755e-07 1.09216e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47250 ( )
Epeak [keV] : 2.45085 ( -5.56376 5.39272 )
Norm@50keV : 0.545606 ( -3.42319 1435.86 )
------------------------------------------------------------
Chi-Squared = 52.74739 using 59 PHA bins.
but latest trial 11.7863 gives Chi-Squared = 12.0504
Reduced chi-squared = 0.9419178 for 56 degrees of freedom
Null hypothesis probability = 0.599
Photon flux (15-150 keV) in 64.00 sec: 0.427630 ( -0.055221 0.055278 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.32986e-07 ( -1.08723e-07 1.09203e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51644 ( )
beta : -4.83031 ( )
Epeak [keV] : 15.9252 ( )
Norm@50keV : 5.914696E-03 ( )
------------------------------------------------------------
Chi-Squared = 142.8619 using 59 PHA bins.
Reduced chi-squared = 2.597489 for 55 degrees of freedom
Null hypothesis probability = 9.609E-10
Photon flux (15-150 keV) in 64.00 sec: 0.433904 ( -0.054966 0.054935 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.37811e-07 ( -1.06253e-07 1.06259e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.58352 ( -0.475610 0.830022 )
Norm@50keV : 1.568883E-04 ( -1.568883E-04 9.143045E-05) )
------------------------------------------------------------
Chi-Squared = 54.55139 using 59 PHA bins.
Reduced chi-squared = 0.9570420 for 57 degrees of freedom
Null hypothesis probability = 0.567
Photon flux (15-150 keV) in 64.00 sec: 0.427584 ( -0.054532 0.054535 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.33491e-07 ( -1.08755e-07 1.09216e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47250 ( )
Epeak [keV] : 2.45085 ( -5.56376 5.39272 )
Norm@50keV : 0.545606 ( -3.42319 1435.86 )
------------------------------------------------------------
Chi-Squared = 52.74739 using 59 PHA bins.
but latest trial 11.7863 gives Chi-Squared = 12.0504
Reduced chi-squared = 0.9419178 for 56 degrees of freedom
Null hypothesis probability = 0.599
Photon flux (15-150 keV) in 64.00 sec: 0.427630 ( -0.055221 0.055278 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.32986e-07 ( -1.08723e-07 1.09203e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51644 ( )
beta : -4.83031 ( )
Epeak [keV] : 15.9252 ( )
Norm@50keV : 5.914696E-03 ( )
------------------------------------------------------------
Chi-Squared = 142.8619 using 59 PHA bins.
Reduced chi-squared = 2.597489 for 55 degrees of freedom
Null hypothesis probability = 9.609E-10
Photon flux (15-150 keV) in 64.00 sec: 0.433904 ( -0.054966 0.054935 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.37811e-07 ( -1.06253e-07 1.06259e-07 ) ergs/cm2
Plot creation:
Thu Jan 10 19:23:55 EST 2008