batgrbproduct Analysis for Trigger=207364
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): Mon Dec 31 20:24:03 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger207364/GCN5_download_cron
======================================================================
Trigger: 00207364 Segment: 000
BAT Trigger Time: 167887369.216 [s; MET]
Trigger Stop: 167887370.24 [s; MET]
UTC: 2006-04-28T03:22:48.056420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 123.567655340779 Dec: -37.1647612611289 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.35
Image Trigger?: NO
Rate S/N Ratio: 9.4339811320566 [ if not an image trigger ]
Image S/N Ratio: 7.35
Flight Position: [ source = BAT ]
RA: 123.567655340779 Dec: -37.1647612611289 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 123.545480111378 Dec: -37.1683727828689 [deg; J2000]
{ 08h 14m 10.9s , -37d 10' 06.1" }
+/- 0.948926198345982 [arcmin] (estimated 90% radius based on SNR)
+/- 0.305892368648468 [arcmin] (formal 1-sigma fit error)
SNR: 32.7826056883397
RA = 8h 14m 10.9s (123.545480 deg.)
Dec = -37d 10' 6" (-37.168373 deg.)
Angular difference between Flight and Ground position is 1.082180 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 39.4959999918938 +/- 3.88719335656981
Measured from: -1.77199998497963
to: 37.7240000069141 [s; relative to TRIGTIME]
T50: 20.6200000047684 +/- 1.62665914689375
Measured from: 4.09600001573563
to: 24.716000020504 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.22800001502037
to: 5.22800001502037 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.81199997663498
to: 42.9600000083447 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.983295 1.001005 0.505600 0.075377
0.038437 0.038991 0.033742 0.028806 [error]
Peak 0.091206 0.099290 0.058027 0.006271
0.007094 0.007250 0.006038 0.004448 [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 3.25e-07 4.30e-07 4.17e-07 7.25e-07 1.41e-06 1.90e-06 erg/cm2
Error 2.80e-08 2.18e-08 3.50e-08 1.28e-07 7.83e-08 1.58e-07 erg/cm2
Peak flux Power-law 1.05e+00 7.58e-01 3.64e-01 2.46e-01 2.28e+00 2.41e+00 ph/cm2/s
Error 1.33e-01 6.44e-02 5.09e-02 6.61e-02 1.97e-01 2.05e-01 ph/cm2/s
Fluence Cutoff-PL 3.15e-07 4.38e-07 4.17e-07 5.12e-07 1.38e-06 1.68e-06 erg/cm2
Error 3.35e-08 2.57e-08 3.63e-08 2.80e-07 9.26e-08 3.05e-07 erg/cm2
Peak flux Cutoff-PL 9.70e-01 8.10e-01 3.68e-01 1.18e-01 2.23e+00 2.27e+00 ph/cm2/s
Error 1.53e-01 8.32e-02 5.66e-02 9.65e-02 2.04e-01 2.26e-01 ph/cm2/s
Fluence Band 1.89e-06 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 9.54e-08 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 9.70e-01 8.10e-01 3.68e-01 1.19e-01 2.23e+00 2.27e+00 ph/cm2/s
Error 1.53e-01 8.32e-02 5.66e-02 9.63e-02 2.04e-01 2.26e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.042 0.106 - - 3.06e-03 1.81e-04 40.410 57
CPL 1.825 0.360 36.9 4996.2 4.00e-03 2.08e-03 39.640 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.059 0.162 - - 1.48e-02 1.56e-03 63.250 57
CPL 1.444 0.545 39.7 29.6 3.26e-02 3.21e-02 60.242 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: 40.576000 sec.
T50 in the 50-300 keV band: 22.528000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 49.772 -6.812 42.960
T90 39.496 -1.772 37.724
T50 20.620 4.096 24.716
Peak 1.000 4.228 5.228
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
123.5455 -37.1684 0.0059 25.4 137.9 1.5226 32.8 TRIG_00207364
------------------------------------------
Foreground time interval of the image:
-6.812 8.885 (delta_t = 15.697 [sec])
Background time interval of the image:
-239.216 -6.812 (delta_t = 232.404 [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 -6.812 sec. to 42.960 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04170 ( -0.104878 0.107009 )
Norm@50keV : 3.064893E-03 ( -1.820114E-04 1.799520E-04) )
------------------------------------------------------------
Chi-Squared = 40.40976 using 59 PHA bins.
Reduced chi-squared = 0.7089432 for 57 degrees of freedom
Null hypothesis probability = 0.953
Photon flux (15-150 keV) in 49.77 sec: 0.468773 ( -0.025305 0.025412 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41036e-06 ( -7.80095e-08 7.85371e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.812 sec. to 42.960 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.82474 ( -0.427271 0.292194 )
Epeak [keV] : 36.9096 ( -29.3481 9963.09 )
Norm@50keV : 3.999658E-03 ( -1.448849E-03 2.702208E-03) )
------------------------------------------------------------
Chi-Squared = 39.63959 using 59 PHA bins.
but latest trial 2.11466 gives Chi-Squared = 1.33871
but latest trial 32.4192 gives Chi-Squared = 6.419373E-02
Reduced chi-squared = 0.7078498 for 56 degrees of freedom
Null hypothesis probability = 0.952
Photon flux (15-150 keV) in 49.77 sec: 0.462106 ( -0.02825 0.028106 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38209e-06 ( -9.49363e-08 9.03525e-08 ) ergs/cm2
Band function
Time interval is from -6.812 sec. to 42.960 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.44334 ( -8.55666 2.49122 )
beta : -2.15328 ( -7.84672 0.199890 )
Epeak [keV] : 33.3734 ( -35.0966 9964.80 )
Norm@50keV : 7.092973E-03 ( -1.321235E-03 1029.25 )
------------------------------------------------------------
Chi-Squared = 39.99802 using 59 PHA bins.
Reduced chi-squared = 0.7272367 for 55 degrees of freedom
Null hypothesis probability = 0.936
Photon flux (15-150 keV) in 49.77 sec: 0.462065 ( -0.028249 0.028203 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 4.228 sec. to 5.228 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05932 ( -0.158277 0.165796 )
Norm@50keV : 1.480610E-02 ( -1.577667E-03 1.546802E-03) )
------------------------------------------------------------
Chi-Squared = 63.24965 using 59 PHA bins.
Reduced chi-squared = 1.109643 for 57 degrees of freedom
Null hypothesis probability = 0.265
Photon flux (15-150 keV) in 1.000 sec: 2.28369 ( -0.19716 0.19737 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37088e-07 ( -1.3416e-08 1.3565e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.228 sec. to 5.228 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.44390 ( -0.706596 0.384049 )
Epeak [keV] : 39.6937 ( -39.6837 19.4356 )
Norm@50keV : 3.263341E-02 ( -1.645276E-02 4.769596E-02) )
------------------------------------------------------------
Chi-Squared = 60.24233 using 59 PHA bins.
but latest trial 2.03276 gives Chi-Squared = 3.68054
but latest trial 1.615945E-02 gives Chi-Squared = 4.03123
Reduced chi-squared = 1.075756 for 56 degrees of freedom
Null hypothesis probability = 0.325
Photon flux (15-150 keV) in 1.000 sec: 2.22940 ( -0.20404 0.20415 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30807e-07 ( -1.4438e-08 1.4896e-08 ) ergs/cm2
Band function
Time interval is from 4.228 sec. to 5.228 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.44823 ( -0.586929 0.691951 )
beta : -8.99981 ( -1.00019 6.96288 )
Epeak [keV] : 39.6968 ( -18.5611 19.4109 )
Norm@50keV : 3.243011E-02 ( -1.716639E-02 4.790131E-02) )
------------------------------------------------------------
Chi-Squared = 60.24253 using 59 PHA bins.
Reduced chi-squared = 1.095319 for 55 degrees of freedom
Null hypothesis probability = 0.292
Photon flux (15-150 keV) in 1.000 sec: 2.22969 ( -0.20438 0.20397 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30708e-07 ( -1.4498e-08 1.4833e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 20:42:13 EST 2007