batgrbproduct Analysis for Trigger=303161
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 Feb 13 20:12:48 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger303161/GCN5_download_cron
======================================================================
Trigger: 00303161 Segment: 000
BAT Trigger Time: 224599258.816 [s; MET]
Trigger Stop: 224599259.84 [s; MET]
UTC: 2008-02-13T12:40:56.244200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 297.78548243037 Dec: -61.4492730852506 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.69
Image Trigger?: NO
Rate S/N Ratio: 25.5147016443461 [ if not an image trigger ]
Image S/N Ratio: 5.69
Flight Position: [ source = BAT ]
RA: 297.78548243037 Dec: -61.4492730852506 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 297.987744086921 Dec: -61.3976174232534 [deg; J2000]
{ 19h 51m 57.1s , -61d 23' 51.4" }
+/- 5.62318842157622 [arcmin] (estimated 90% radius based on SNR)
+/- 4.27249417744579 [arcmin] (formal 1-sigma fit error)
SNR: 2.58056387987074
RA = 19h 51m 57.1s (297.987744 deg.)
Dec = -61d 23' 51" (-61.397617 deg.)
Angular difference between Flight and Ground position is 6.580480 arcmin
Partial Coding Fraction: 0.4453125 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.016329 0.004406 0.030863 0.058839
0.013422 0.014687 0.014313 0.017769 [error]
Peak -0.016329 0.004406 0.030863 0.058839
0.013422 0.014687 0.014313 0.017769 [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 1.96e-10 1.92e-09 1.69e-08 9.46e-07 6.79e-08 5.52e-07 erg/cm2
Error 7.12e-10 3.39e-09 1.55e-08 6.45e-07 3.95e-08 0.00e+00 erg/cm2
Peak flux Power-law 5.94e-03 3.01e-02 1.32e-01 2.30e+00 4.03e-01 2.46e+00 ph/cm2/s
Error 2.17e-02 5.50e-02 1.24e-01 1.87e+00 2.68e-01 1.96e+00 ph/cm2/s
Fluence Cutoff-PL 6.37e-11 1.23e-09 1.75e-08 6.30e-07 7.50e-08 2.24e-07 erg/cm2
Error 6.08e-10 3.09e-09 1.79e-08 6.98e-07 4.11e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.73e-03 1.76e-02 1.31e-01 1.72e+00 4.22e-01 2.00e+00 ph/cm2/s
Error 1.85e-02 4.98e-02 1.41e-01 3.75e+00 2.60e-01 3.18e+00 ph/cm2/s
Fluence Band 5.80e-11 9.92e-10 1.83e-08 3.34e-07 8.04e-08 1.45e-06 erg/cm2
Error 1.96e-06 5.96e-08 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 7.03e-04 9.52e-03 1.34e-01 1.04e+00 4.45e-01 1.47e+00 ph/cm2/s
Error 4.75e-02 1.48e-01 3.72e+00 2.39e-01 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.141 1.003 - - 1.65e-03 2.27e-03 61.867 57
CPL -2.500 0.000 365.9 4789.5 2.58e-03 1.12e-02 61.390 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.141 1.003 - - 1.65e-03 2.27e-03 61.867 57
CPL -2.500 0.000 365.9 4789.5 2.58e-03 1.12e-02 61.390 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
297.9877 -61.3976 0.0748 44.0 -14.6 0.0822 2.6 TRIG_00303161
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.816 -46.954 (delta_t = 13.862 [sec])
-28.816 -16.282 (delta_t = 12.534 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.14116 ( -0.818977 1.18748 )
Norm@50keV : 1.646793E-03 ( -1.646793E-03 2.885971E-03) )
------------------------------------------------------------
Chi-Squared = 61.86727 using 59 PHA bins.
Reduced chi-squared = 1.085391 for 57 degrees of freedom
Null hypothesis probability = 0.307
Photon flux (15-150 keV) in 1.024 sec: 0.402988 ( -0.262898 0.272652 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.79371e-08 ( -4.23489e-08 3.67157e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49998 ( )
Epeak [keV] : 365.931 ( -359.197 9219.78 )
Norm@50keV : 2.578283E-03 ( -2.070861E-03 2.036057E-02) )
------------------------------------------------------------
Chi-Squared = 61.38979 using 59 PHA bins.
but latest trial 1014.85 gives Chi-Squared = 0.367905
Reduced chi-squared = 1.096246 for 56 degrees of freedom
Null hypothesis probability = 0.289
Photon flux (15-150 keV) in 1.024 sec: 0.422141 ( -0.256379 0.264141 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.49794e-08 ( -4.34859e-08 3.879e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.22875 ( -11.2287 3.77125 )
beta : 1.11810 ( -11.1181 0.842558 )
Epeak [keV] : 30.7667 ( -9999.90 0.00000 )
Norm@50keV : 2.865769E-03 ( -1.583469E-03 2.885611E-03) )
------------------------------------------------------------
Chi-Squared = 61.86825 using 59 PHA bins.
Reduced chi-squared = 1.124877 for 55 degrees of freedom
Null hypothesis probability = 0.244
Photon flux (15-150 keV) in 1.024 sec: 0.445409 ( -0.248791 0.229142 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.03697e-08 ( -8.03697e-08 3.88157e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.14116 ( -0.818977 1.18748 )
Norm@50keV : 1.646793E-03 ( -1.646793E-03 2.885971E-03) )
------------------------------------------------------------
Chi-Squared = 61.86727 using 59 PHA bins.
Reduced chi-squared = 1.085391 for 57 degrees of freedom
Null hypothesis probability = 0.307
Photon flux (15-150 keV) in 1.024 sec: 0.402988 ( -0.262898 0.272652 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.79371e-08 ( -4.23489e-08 3.67157e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49998 ( )
Epeak [keV] : 365.931 ( -359.197 9219.78 )
Norm@50keV : 2.578283E-03 ( -2.070861E-03 2.036057E-02) )
------------------------------------------------------------
Chi-Squared = 61.38979 using 59 PHA bins.
but latest trial 1014.85 gives Chi-Squared = 0.367905
Reduced chi-squared = 1.096246 for 56 degrees of freedom
Null hypothesis probability = 0.289
Photon flux (15-150 keV) in 1.024 sec: 0.422141 ( -0.256379 0.264141 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.49794e-08 ( -4.34859e-08 3.879e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.22875 ( -11.2287 3.77125 )
beta : 1.11810 ( -11.1181 0.842558 )
Epeak [keV] : 30.7667 ( -9999.90 0.00000 )
Norm@50keV : 2.865769E-03 ( -1.583469E-03 2.885611E-03) )
------------------------------------------------------------
Chi-Squared = 61.86825 using 59 PHA bins.
Reduced chi-squared = 1.124877 for 55 degrees of freedom
Null hypothesis probability = 0.244
Photon flux (15-150 keV) in 1.024 sec: 0.445409 ( -0.248791 0.229142 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.03697e-08 ( -8.03697e-08 3.88157e-08 ) ergs/cm2
Plot creation:
Wed Feb 13 20:28:32 EST 2008