batgrbproduct Analysis for Trigger=333666
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 Nov 5 00:57:49 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger333666/GCN5_download_cron
======================================================================
Trigger: 00333666 Segment: 000
BAT Trigger Time: 247484085.696 [s; MET]
Trigger Stop: 247484093.888 [s; MET]
UTC: 2008-11-04T09:34:42.467620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 100.485289941374 Dec: -54.7321618369165 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.32
Image Trigger?: NO
Rate S/N Ratio: 6.70820393249937 [ if not an image trigger ]
Image S/N Ratio: 9.32
Flight Position: [ source = BAT ]
RA: 100.485289941374 Dec: -54.7321618369165 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 100.499836366604 Dec: -54.7215096827174 [deg; J2000]
{ 06h 42m 00.0s , -54d 43' 17.4" }
+/- 1.31459701811596 [arcmin] (estimated 90% radius based on SNR)
+/- 0.574388581179863 [arcmin] (formal 1-sigma fit error)
SNR: 20.5785421404905
Angular difference between Flight and Ground position is 0.813950 arcmin
Partial Coding Fraction: 0.3203125 [ including projection effects ]
Duration
T90: 59.0640000104904 +/- 13.8551916840475
Measured from: -14.8759999275208
to: 44.1880000829697 [s; relative to TRIGTIME]
T50: 22.4280000329018 +/- 4.10385574499634
Measured from: 6.09200006723404
to: 28.5200001001358 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 13.5399999916553
to: 14.5399999916553 [s; relative to TRIGTIME]
Total Fluence
Measured from: -23.5
to: 51.1719999909401 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.171871 1.298040 0.748878 0.101981
0.083201 0.084825 0.076424 0.071020 [error]
Peak 0.037165 0.043656 0.021218 0.026583
0.009805 0.010099 0.009204 0.008590 [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 4.37e-07 5.94e-07 5.95e-07 1.08e-06 1.97e-06 2.71e-06 erg/cm2
Error 5.07e-08 4.57e-08 7.39e-08 2.69e-07 1.72e-07 3.45e-07 erg/cm2
Peak flux Power-law 4.02e-01 3.47e-01 2.06e-01 1.82e-01 1.03e+00 1.14e+00 ph/cm2/s
Error 1.75e-01 9.37e-02 7.71e-02 1.42e-01 2.77e-01 2.97e-01 ph/cm2/s
Fluence Cutoff-PL 4.03e-07 6.38e-07 5.97e-07 4.18e-07 1.88e-06 2.07e-06 erg/cm2
Error 5.89e-08 5.97e-08 8.23e-08 3.67e-07 1.89e-07 4.15e-07 erg/cm2
Peak flux Cutoff-PL 4.02e-01 3.48e-01 2.06e-01 1.81e-01 1.03e+00 1.14e+00 ph/cm2/s
Error 1.75e-01 9.37e-02 7.72e-02 1.41e-01 2.77e-01 2.97e-01 ph/cm2/s
Fluence Band 3.99e-07 6.35e-07 5.95e-07 4.16e-07 1.87e-06 2.11e-06 erg/cm2
Error 5.83e-08 5.95e-08 8.21e-08 3.66e-07 1.89e-07 5.01e-07 erg/cm2
Peak flux Band 4.12e-01 5.35e-01 3.17e-01 2.82e-01 1.59e+00 1.14e+00 ph/cm2/s
Error 3.02e-01 2.55e-01 1.59e-01 9.00e-01 2.96e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.997 0.143 - - 2.87e-03 2.60e-04 59.964 57
CPL 1.338 0.607 45.2 19.0 6.56e-03 5.76e-03 55.890 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.757 0.508 - - 7.62e-03 2.20e-03 58.235 57
CPL 2.133 0.942 54.8 4977.5 4.72e-03 2.57e-02 58.127 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: 43.264000 sec.
T50 in the 50-300 keV band: 19.840000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 74.672 -23.500 51.172
T90 59.064 -14.876 44.188
T50 22.428 6.092 28.520
Peak 1.000 13.540 14.540
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
100.4998 -54.7215 0.0093 47.9 -177.4 3.6971 20.6 TRIG_00333666
------------------------------------------
Foreground time interval of the image:
-23.500 51.172 (delta_t = 74.672 [sec])
Background time interval of the image:
-239.696 -23.500 (delta_t = 216.196 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -23.500 sec. to 51.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99705 ( -0.140249 0.145545 )
Norm@50keV : 2.866352E-03 ( -2.624365E-04 2.585365E-04) )
------------------------------------------------------------
Chi-Squared = 59.96420 using 59 PHA bins.
Reduced chi-squared = 1.052004 for 57 degrees of freedom
Null hypothesis probability = 0.369
Photon flux (15-150 keV) in 74.67 sec: 0.429372 ( -0.03383 0.033879 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9733e-06 ( -1.70964e-07 1.72951e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -23.500 sec. to 51.172 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33798 ( -0.654608 0.559886 )
Epeak [keV] : 45.1718 ( -17.4975 20.4996 )
Norm@50keV : 6.564439E-03 ( -3.278157E-03 8.248027E-03) )
------------------------------------------------------------
Chi-Squared = 55.89003 using 59 PHA bins.
but latest trial 1.89846 gives Chi-Squared = 2.79434
Reduced chi-squared = 0.9980363 for 56 degrees of freedom
Null hypothesis probability = 0.479
Photon flux (15-150 keV) in 74.67 sec: 0.416693 ( -0.035465 0.035439 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87689e-06 ( -1.88437e-07 1.89878e-07 ) ergs/cm2
Band function
Time interval is from -23.500 sec. to 51.172 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33982 ( -0.563157 0.656471 )
beta : -8.25356 ( -1.74644 6.22222 )
Epeak [keV] : 45.1886 ( -12.4788 20.6248 )
Norm@50keV : 6.546139E-03 ( -6.546139E-03 8.268625E-03) )
------------------------------------------------------------
Chi-Squared = 55.89034 using 59 PHA bins.
Reduced chi-squared = 1.016188 for 55 degrees of freedom
Null hypothesis probability = 0.441
Photon flux (15-150 keV) in 74.67 sec: 0.416705 ( -0.035496 0.035471 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87447e-06 ( -1.88161e-07 1.89848e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 13.540 sec. to 14.540 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75726 ( -0.489915 0.525205 )
Norm@50keV : 7.623874E-03 ( -2.262296E-03 2.141600E-03) )
------------------------------------------------------------
Chi-Squared = 58.23493 using 59 PHA bins.
Reduced chi-squared = 1.021665 for 57 degrees of freedom
Null hypothesis probability = 0.430
Photon flux (15-150 keV) in 1.000 sec: 1.03365 ( -0.27635 0.27741 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.0332e-08 ( -2.06501e-08 2.11341e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.540 sec. to 14.540 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13344 ( -1.85091 3.317499E-02) )
Epeak [keV] : 54.8495 ( -9.79060 9945.15 )
Norm@50keV : 4.723898E-03 ( -4.723899E-03 4.677211E-02) )
------------------------------------------------------------
Chi-Squared = 58.12718 using 59 PHA bins.
Reduced chi-squared = 1.037985 for 56 degrees of freedom
Null hypothesis probability = 0.397
Photon flux (15-150 keV) in 1.000 sec: 1.03327 ( -0.276252 0.27731 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.0321e-08 ( -2.0651e-08 2.11637e-08 ) ergs/cm2
Band function
Time interval is from 13.540 sec. to 14.540 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24673 ( -8.75327 5.67497 )
beta : -1.78766 ( -8.21234 0.514444 )
Epeak [keV] : 40.4270 ( -40.3270 9959.57 )
Norm@50keV : 1.764613E-02 ( -1.00968 858.664 )
------------------------------------------------------------
Chi-Squared = 58.17356 using 59 PHA bins.
Reduced chi-squared = 1.057701 for 55 degrees of freedom
Null hypothesis probability = 0.359
Photon flux (15-150 keV) in 1.000 sec: 1.59052 ( -0.82475 0.97468 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.0008e-08 ( -2.24032e-08 2.09964e-08 ) ergs/cm2
Plot creation:
Wed Nov 5 01:16:41 EST 2008