batgrbproduct Analysis for Trigger=296805
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): Sat Dec 15 00:29:40 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger296805/GCN5_download_cron
======================================================================
Trigger: 00296805 Segment: 000
BAT Trigger Time: 217003809.28 [s; MET]
Trigger Stop: 217003810.304 [s; MET]
UTC: 2007-11-17T14:50:06.911640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 335.020304401352 Dec: -63.4411756875453 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 25.57
Image Trigger?: NO
Rate S/N Ratio: 152.613891897166 [ if not an image trigger ]
Image S/N Ratio: 25.57
Flight Position: [ source = BAT ]
RA: 335.020304401352 Dec: -63.4411756875453 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 335.026221693181 Dec: -63.441722581869 [deg; J2000]
{ 22h 20m 06.3s , -63d 26' 30.2" }
+/- 0.702688058822795 [arcmin] (estimated 90% radius based on SNR)
+/- 0.20159714777884 [arcmin] (formal 1-sigma fit error)
SNR: 50.3534218896272
RA = 22h 20m 6.3s (335.026222 deg.)
Dec = -63d 26' 30" (-63.441723 deg.)
Angular difference between Flight and Ground position is 0.162098 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 6.53200000524521 +/- 1.82485944742003
Measured from: -0.203999996185303
to: 6.32800000905991 [s; relative to TRIGTIME]
T50: 1.71999999880791 +/- 0.116275530565029
Measured from: 0.395999997854233
to: 2.11599999666214 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0200000107288361
to: 1.02000001072884 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.439999997615814
to: 13.8840000033379 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.967662 1.341644 1.065609 0.263963
0.031711 0.033264 0.030245 0.023983 [error]
Peak 0.216473 0.468915 0.515890 0.139911
0.011085 0.013952 0.014439 0.009570 [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 3.49e-07 6.17e-07 8.32e-07 2.30e-06 2.41e-06 4.13e-06 erg/cm2
Error 2.20e-08 2.22e-08 3.12e-08 1.99e-07 7.67e-08 2.15e-07 erg/cm2
Peak flux Power-law 2.71e+00 3.50e+00 3.30e+00 5.50e+00 1.14e+01 1.50e+01 ph/cm2/s
Error 1.84e-01 1.48e-01 1.14e-01 3.94e-01 3.97e-01 5.07e-01 ph/cm2/s
Fluence Cutoff-PL 3.21e-07 6.30e-07 8.59e-07 1.53e-06 2.37e-06 3.33e-06 erg/cm2
Error 2.87e-08 2.99e-08 3.67e-08 4.33e-07 8.34e-08 4.36e-07 erg/cm2
Peak flux Cutoff-PL 2.21e+00 3.63e+00 3.66e+00 3.08e+00 1.11e+01 1.26e+01 ph/cm2/s
Error 2.32e-01 1.64e-01 1.61e-01 5.56e-01 4.02e-01 6.75e-01 ph/cm2/s
Fluence Band 3.19e-07 6.27e-07 8.57e-07 1.53e-06 2.37e-06 3.35e-06 erg/cm2
Error 2.84e-08 2.41e-08 3.67e-08 4.33e-07 8.32e-08 4.36e-07 erg/cm2
Peak flux Band 2.11e+00 3.69e+00 3.60e+00 4.06e+00 1.10e+01 1.35e+01 ph/cm2/s
Error 2.70e-01 1.99e-01 1.89e-01 6.94e-01 4.13e-01 9.68e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.570 0.058 - - 1.80e-02 5.51e-04 46.581 57
CPL 1.232 0.244 127.2 94.0 2.55e-02 6.42e-03 40.592 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.083 0.055 - - 9.80e-02 3.28e-03 71.491 57
CPL 0.339 0.256 133.0 28.4 2.06e-01 5.20e-02 42.435 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: 2.432000 sec.
T50 in the 50-300 keV band: 0.960000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 14.324 -0.440 13.884
T90 6.532 -0.204 6.328
T50 1.720 0.396 2.116
Peak 1.000 0.020 1.020
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
335.0262 -63.4417 0.0038 39.4 -25.1 3.7642 50.4 TRIG_00296805
------------------------------------------
Foreground time interval of the image:
-0.440 13.884 (delta_t = 14.324 [sec])
Background time interval of the image:
-239.280 -0.440 (delta_t = 238.840 [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 -0.440 sec. to 13.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56984 ( -5.832124E-02 5.839515E-02) )
Norm@50keV : 1.795495E-02 ( -5.511679E-04 5.511604E-04) )
------------------------------------------------------------
Chi-Squared = 46.58102 using 59 PHA bins.
Reduced chi-squared = 0.8172110 for 57 degrees of freedom
Null hypothesis probability = 0.836
Photon flux (15-150 keV) in 14.32 sec: 2.28626 ( -0.08006 0.08043 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41422e-06 ( -7.69414e-08 7.64115e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.440 sec. to 13.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23205 ( -0.250705 0.237957 )
Epeak [keV] : 127.221 ( -31.6871 156.349 )
Norm@50keV : 2.551059E-02 ( -5.470013E-03 7.373163E-03) )
------------------------------------------------------------
Chi-Squared = 40.59182 using 59 PHA bins.
Reduced chi-squared = 0.7248539 for 56 degrees of freedom
Null hypothesis probability = 0.940
Photon flux (15-150 keV) in 14.32 sec: 2.22937 ( -0.08815 0.08503 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37089e-06 ( -8.35572e-08 8.31562e-08 ) ergs/cm2
Band function
Time interval is from -0.440 sec. to 13.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.23297 ( -0.237041 0.251680 )
beta : -9.27526 ( -0.724745 7.65174 )
Epeak [keV] : 127.436 ( -31.9213 156.749 )
Norm@50keV : 2.548131E-02 ( -5.443584E-03 7.401142E-03) )
------------------------------------------------------------
Chi-Squared = 40.59197 using 59 PHA bins.
Reduced chi-squared = 0.7380359 for 55 degrees of freedom
Null hypothesis probability = 0.927
Photon flux (15-150 keV) in 14.32 sec: 2.22942 ( -0.08821 0.08871 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36893e-06 ( -8.34999e-08 8.29844e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.020 sec. to 1.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08349 ( -5.486989E-02 5.442703E-02) )
Norm@50keV : 9.802153E-02 ( -3.285468E-03 3.280163E-03) )
------------------------------------------------------------
Chi-Squared = 71.49106 using 59 PHA bins.
Reduced chi-squared = 1.254229 for 57 degrees of freedom
Null hypothesis probability = 9.375E-02
Photon flux (15-150 keV) in 1.000 sec: 11.3525 ( -0.3964 0.3967 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03029e-06 ( -3.5104e-08 3.5153e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.020 sec. to 1.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.339050 ( -0.263929 0.249052 )
Epeak [keV] : 133.049 ( -19.9854 36.8015 )
Norm@50keV : 0.206288 ( -4.431914E-02 5.965395E-02) )
------------------------------------------------------------
Chi-Squared = 42.43492 using 59 PHA bins.
Reduced chi-squared = 0.7577664 for 56 degrees of freedom
Null hypothesis probability = 0.910
Photon flux (15-150 keV) in 1.000 sec: 11.1235 ( -0.4014 0.4021 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01873e-06 ( -3.6502e-08 3.6434e-08 ) ergs/cm2
Band function
Time interval is from 0.020 sec. to 1.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.971753E-02 ( -0.434496 0.785314 )
beta : -1.53486 ( -8.46514 0.230251 )
Epeak [keV] : 103.079 ( -35.7206 50.9830 )
Norm@50keV : 0.288338 ( -0.112316 0.549001 )
------------------------------------------------------------
Chi-Squared = 40.88973 using 59 PHA bins.
Reduced chi-squared = 0.7434497 for 55 degrees of freedom
Null hypothesis probability = 0.922
Photon flux (15-150 keV) in 1.000 sec: 11.0213 ( -0.4057 0.4195 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01815e-06 ( -3.6555e-08 3.6364e-08 ) ergs/cm2
Plot creation:
Sat Dec 15 00:51:25 EST 2007