batgrbproduct Analysis for Trigger=203040
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 16:27:14 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger203040/GCN5_download_cron
======================================================================
Trigger: 00203040 Segment: 000
BAT Trigger Time: 165239955.808 [s; MET]
Trigger Stop: 165239956.192 [s; MET]
UTC: 2006-03-28T11:59:14.709780 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 286.798704047986 Dec: 9.33496732855129 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 18.6
Image Trigger?: NO
Rate S/N Ratio: 97.6319619796714 [ if not an image trigger ]
Image S/N Ratio: 18.6
Flight Position: [ source = BAT ]
RA: 286.798704047986 Dec: 9.33496732855129 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 286.812912421296 Dec: 9.32648471108388 [deg; J2000]
{ 19h 07m 15.1s , +09d 19' 35.3" }
+/- 1.21745114539062 [arcmin] (estimated 90% radius based on SNR)
+/- 0.418987237769146 [arcmin] (formal 1-sigma fit error)
SNR: 22.963852448175
RA = 19h 7m 15.1s (286.812912 deg.)
Dec = 9d 19' 35" (9.326485 deg.)
Angular difference between Flight and Ground position is 0.983206 arcmin
Partial Coding Fraction: 0.6953125 [ including projection effects ]
Duration
T90: 0.320000022649765 +/- 0.0320000052452087
Measured from: 0.275999993085861
to: 0.596000015735626 [s; relative to TRIGTIME]
T50: 0.0400000214576721 +/- 0.0164924197847099
Measured from: 0.287999987602234
to: 0.328000009059906 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0579999983310699
to: 0.94200000166893 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.275999993085861
to: 0.604000002145767 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.123011 0.087884 0.031042 0.006592
0.006663 0.006008 0.004181 0.003022 [error]
Peak 0.122757 0.088489 0.031347 0.007226
0.006691 0.006056 0.004208 0.003048 [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 4.05e-08 3.76e-08 2.40e-08 2.36e-08 1.12e-07 1.31e-07 erg/cm2
Error 4.31e-09 3.09e-09 3.80e-09 7.09e-09 9.48e-09 0.00e+00 erg/cm2
Peak flux Power-law 4.02e+00 2.11e+00 6.86e-01 2.88e-01 6.97e+00 7.10e+00 ph/cm2/s
Error 4.40e-01 1.69e-01 1.04e-01 8.01e-02 5.66e-01 5.67e-01 ph/cm2/s
Fluence Cutoff-PL 3.91e-08 4.04e-08 2.19e-08 7.23e-09 1.06e-07 1.13e-07 erg/cm2
Error 4.68e-09 4.08e-09 4.93e-09 1.07e-08 1.05e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.85e+00 2.25e+00 6.46e-01 1.18e-01 6.83e+00 6.86e+00 ph/cm2/s
Error 4.81e-01 2.20e-01 1.28e-01 1.28e-01 5.84e-01 5.98e-01 ph/cm2/s
Fluence Band 3.92e-08 3.94e-08 2.15e-08 1.72e-08 1.08e-07 1.19e-07 erg/cm2
Error 4.95e-09 3.77e-09 4.38e-09 1.01e-08 9.92e-09 1.34e-08 erg/cm2
Peak flux Band 3.85e+00 2.25e+00 6.45e-01 1.17e-01 6.83e+00 6.86e+00 ph/cm2/s
Error 4.81e-01 2.23e-01 1.28e-01 9.24e-02 5.85e-01 5.99e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.641 0.163 - - 3.28e-02 3.78e-03 54.241 57
CPL 1.982 0.470 1.0 10.6 8.37e-02 1.61e-02 50.795 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.619 0.163 - - 3.29e-02 3.78e-03 50.102 57
CPL 1.941 0.484 3.3 10.4 8.58e-02 8.85e-02 47.359 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.328 0.276 0.604
T90 0.320 0.276 0.596
T50 0.040 0.288 0.328
Peak 1.000 -0.058 0.942
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
286.8129 +9.3265 0.0083 25.0 -123.7 0.2561 23.0 TRIG_00203040
------------------------------------------
Foreground time interval of the image:
0.244 0.572 (delta_t = 0.328 [sec])
Background time interval of the image:
-9.840 0.244 (delta_t = 10.084 [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 0.244 sec. to 0.572 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.64084 ( -0.158976 0.167382 )
Norm@50keV : 3.278164E-02 ( -3.807278E-03 3.761854E-03) )
------------------------------------------------------------
Chi-Squared = 54.24068 using 59 PHA bins.
Reduced chi-squared = 0.9515908 for 57 degrees of freedom
Null hypothesis probability = 0.579
Photon flux (15-150 keV) in 0.3280 sec: 7.03802 ( -0.57013 0.57126 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12055e-07 ( -9.38572e-09 9.58383e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.244 sec. to 0.572 sec.
Photon index: 1.98173 ( -0.927847 1.243985E-02) )
Epeak [keV] : 1.03110 ( -0.762100 20.5053 )
Norm@50keV : 8.371338E-02 ( -1.481721E-02 1.733087E-02) )
------------------------------------------------------------
Chi-Squared = 50.79530 using 59 PHA bins.
but latest trial 1.14569 gives Chi-Squared = 410.371
but latest trial 1.99345 gives Chi-Squared = 11.8549
but latest trial 2.213347E-02 gives Chi-Squared = 5.069733E-03
Reduced chi-squared = 0.9070588 for 56 degrees of freedom
Null hypothesis probability = 0.672
Photon flux (15-150 keV) in 0.3280 sec: 6.87969 ( -0.58931 0.58936 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06468e-07 ( -1.04435e-08 1.06423e-08 ) ergs/cm2
Band function
Time interval is from 0.244 sec. to 0.572 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73783 ( -8.26217 0.271595 )
beta : -9.33048 ( -0.669522 19.3305 )
Epeak [keV] : 13.3929 ( -13.2929 11.3109 )
Norm@50keV : 0.100371 ( -7.883973E-03 3.580720E-02) )
------------------------------------------------------------
Chi-Squared = 53.07368 using 59 PHA bins.
Reduced chi-squared = 0.9649760 for 55 degrees of freedom
Null hypothesis probability = 0.549
Photon flux (15-150 keV) in 0.3280 sec: 6.87836 ( -0.58804 0.59076 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08382e-07 ( -9.79867e-09 1.00486e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.244 sec. to 0.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.61875 ( -0.159130 0.167302 )
Norm@50keV : 3.294531E-02 ( -3.800059E-03 3.752604E-03) )
------------------------------------------------------------
Chi-Squared = 50.10219 using 59 PHA bins.
Reduced chi-squared = 0.8789858 for 57 degrees of freedom
Null hypothesis probability = 0.729
Photon flux (15-150 keV) in 0.3320 sec: 6.97293 ( -0.56525 0.56645 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13248e-07 ( -9.55264e-09 9.628e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.244 sec. to 0.576 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94122 ( -0.723165 0.245497 )
Epeak [keV] : 3.25662 ( -2.91068 17.9624 )
Norm@50keV : 8.582115E-02 ( -1.896590E-02 0.158054 )
------------------------------------------------------------
Chi-Squared = 47.35925 using 59 PHA bins.
but latest trial -0.648201 gives Chi-Squared = 85.1388
Reduced chi-squared = 0.8457009 for 56 degrees of freedom
Null hypothesis probability = 0.788
Photon flux (15-150 keV) in 0.3320 sec: 6.83053 ( -0.58463 0.58337 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0815e-07 ( -1.07887e-08 1.07585e-08 ) ergs/cm2
Band function
Time interval is from 0.244 sec. to 0.576 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.71996 ( -0.749308 0.996719 )
beta : -9.29599 ( -7.19593 12.8027 )
Epeak [keV] : 13.9877 ( -7.52357 3.17096 )
Norm@50keV : 0.103501 ( -146.693 11862.2 )
------------------------------------------------------------
Chi-Squared = 49.31120 using 59 PHA bins.
Reduced chi-squared = 0.8965673 for 55 degrees of freedom
Null hypothesis probability = 0.691
Photon flux (15-150 keV) in 0.3320 sec: 6.82953 ( -0.58379 0.58561 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09531e-07 ( -9.84878e-09 1.0303e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 16:32:40 EST 2007