batgrbproduct Analysis for Trigger=333427
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 Nov 3 04:46:03 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger333427/GCN5_download_cron
======================================================================
Trigger: 00333427 Segment: 000
BAT Trigger Time: 247340682.752 [s; MET]
Trigger Stop: 247340684.8 [s; MET]
UTC: 2008-11-02T17:44:39.527920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 331.182421230354 Dec: 52.99333778508 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.52
Image Trigger?: NO
Rate S/N Ratio: 14 [ if not an image trigger ]
Image S/N Ratio: 8.52
Flight Position: [ source = BAT ]
RA: 331.182421230354 Dec: 52.99333778508 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 331.177500035141 Dec: 52.9910174742092 [deg; J2000]
{ 22h 04m 42.6s , +52d 59' 27.7" }
+/- 1.14730030103816 [arcmin] (estimated 90% radius based on SNR)
+/- 0.464040059778558 [arcmin] (formal 1-sigma fit error)
SNR: 24.9957037767969
Angular difference between Flight and Ground position is 0.225766 arcmin
Partial Coding Fraction: 0.3632812 [ including projection effects ]
Duration
T90: 62.7199999690056 +/- 16.2518734731472
Measured from: -17.3039999008179
to: 45.4160000681877 [s; relative to TRIGTIME]
T50: 18.2079999744892 +/- 5.61125723583548
Measured from: -4.37599992752075
to: 13.8320000469685 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0760000050067902
to: 1.07600000500679 [s; relative to TRIGTIME]
Total Fluence
Measured from: -20.1840000152588
to: 62.8400000035763 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.198444 1.432660 0.912502 0.242676
0.078781 0.081269 0.077997 0.080933 [error]
Peak 0.045707 0.046029 0.075407 0.018226
0.009887 0.010719 0.010269 0.009721 [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 3.89e-07 6.20e-07 7.46e-07 1.75e-06 2.26e-06 3.50e-06 erg/cm2
Error 4.24e-08 4.19e-08 7.87e-08 3.87e-07 1.81e-07 4.56e-07 erg/cm2
Peak flux Power-law 3.41e-01 4.42e-01 4.18e-01 7.01e-01 1.44e+00 1.90e+00 ph/cm2/s
Error 1.21e-01 9.58e-02 8.14e-02 2.98e-01 2.60e-01 3.62e-01 ph/cm2/s
Fluence Cutoff-PL 3.69e-07 6.47e-07 7.47e-07 9.03e-07 2.16e-06 2.71e-06 erg/cm2
Error 5.01e-08 5.38e-08 8.37e-08 7.79e-07 2.15e-07 8.23e-07 erg/cm2
Peak flux Cutoff-PL 3.06e-01 4.53e-01 4.39e-01 4.58e-01 1.41e+00 1.67e+00 ph/cm2/s
Error 1.56e-01 1.05e-01 1.02e-01 4.37e-01 2.72e-01 5.25e-01 ph/cm2/s
Fluence Band 3.64e-07 6.44e-07 7.45e-07 9.02e-07 2.16e-06 2.66e-06 erg/cm2
Error 4.96e-08 5.37e-08 8.35e-08 7.78e-07 2.15e-07 8.22e-07 erg/cm2
Peak flux Band 3.03e-01 4.55e-01 4.40e-01 5.30e-01 1.40e+00 1.75e+00 ph/cm2/s
Error 1.51e-01 1.07e-01 7.40e-02 3.78e-01 2.67e-01 4.28e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.734 0.129 - - 2.95e-03 2.24e-04 48.834 57
CPL 1.242 0.000 70.7 4973.2 5.39e-03 3.55e-03 47.118 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.078 0.312 - - 1.24e-02 2.18e-03 56.161 57
CPL 0.656 1.266 179.7 5000.0 1.93e-02 5.13e-02 55.871 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: 30.400000 sec.
T50 in the 50-300 keV band: 16.960000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 83.024 -20.184 62.840
T90 62.720 -17.304 45.416
T50 18.208 -4.376 13.832
Peak 1.000 0.076 1.076
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
331.1775 +52.9910 0.0078 32.7 50.5 3.6899 25.0 TRIG_00333427
------------------------------------------
Foreground time interval of the image:
-20.184 27.249 (delta_t = 47.433 [sec])
Background time interval of the image:
-239.752 -20.184 (delta_t = 219.568 [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 -20.184 sec. to 62.840 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73379 ( -0.127604 0.130504 )
Norm@50keV : 2.945349E-03 ( -2.251288E-04 2.224825E-04) )
------------------------------------------------------------
Chi-Squared = 48.83397 using 59 PHA bins.
Reduced chi-squared = 0.8567362 for 57 degrees of freedom
Null hypothesis probability = 0.771
Photon flux (15-150 keV) in 83.02 sec: 0.395907 ( -0.026958 0.026983 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25841e-06 ( -1.79639e-07 1.82262e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.184 sec. to 62.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24247 ( )
Epeak [keV] : 70.6944 ( -27.6506 9918.74 )
Norm@50keV : 5.385243E-03 ( -1.670653E-03 5.423643E-03) )
------------------------------------------------------------
Chi-Squared = 47.11802 using 59 PHA bins.
Reduced chi-squared = 0.8413933 for 56 degrees of freedom
Null hypothesis probability = 0.795
Photon flux (15-150 keV) in 83.02 sec: 0.386814 ( -0.029276 0.029157 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16396e-06 ( -2.1376e-07 2.17031e-07 ) ergs/cm2
Band function
Time interval is from -20.184 sec. to 62.840 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30976 ( -8.69024 1.62395 )
beta : -2.11613 ( -7.88387 0.454681 )
Epeak [keV] : 72.9594 ( -72.8594 533.965 )
Norm@50keV : 5.003638E-03 ( -2.035490E-03 0.967824 )
------------------------------------------------------------
Chi-Squared = 46.99131 using 59 PHA bins.
Reduced chi-squared = 0.8543874 for 55 degrees of freedom
Null hypothesis probability = 0.770
Photon flux (15-150 keV) in 83.02 sec: 0.386666 ( -0.029248 0.029122 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16166e-06 ( -2.13444e-07 2.16699e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.072 sec. to 1.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07821 ( -0.318894 0.305670 )
Norm@50keV : 1.240386E-02 ( -2.186947E-03 2.180858E-03) )
------------------------------------------------------------
Chi-Squared = 56.16069 using 59 PHA bins.
Reduced chi-squared = 0.9852753 for 57 degrees of freedom
Null hypothesis probability = 0.507
Photon flux (15-150 keV) in 1.008 sec: 1.43589 ( -0.25942 0.26072 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3161e-07 ( -2.51214e-08 2.54913e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.072 sec. to 1.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.655874 ( -1.82417 0.707905 )
Epeak [keV] : 179.687 ( -179.677 9820.31 )
Norm@50keV : 1.926443E-02 ( -8.869725E-03 9.373044E-02) )
------------------------------------------------------------
Chi-Squared = 55.87125 using 59 PHA bins.
Reduced chi-squared = 0.9977009 for 56 degrees of freedom
Null hypothesis probability = 0.480
Photon flux (15-150 keV) in 1.008 sec: 1.40939 ( -0.27759 0.26721 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28744e-07 ( -2.7474e-08 2.68047e-08 ) ergs/cm2
Band function
Time interval is from 0.072 sec. to 1.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.811049 ( -9.18895 4.61096 )
beta : -1.07954 ( -8.54716 0.669737 )
Epeak [keV] : 80.8869 ( -158.603 9840.92 )
Norm@50keV : 2.126497E-02 ( -1.037728E-02 566.889 )
------------------------------------------------------------
Chi-Squared = 56.15584 using 59 PHA bins.
Reduced chi-squared = 1.021015 for 55 degrees of freedom
Null hypothesis probability = 0.431
Photon flux (15-150 keV) in 1.008 sec: 1.40471 ( -0.26234 0.27261 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28687e-07 ( -2.74549e-08 2.69408e-08 ) ergs/cm2
Plot creation:
Mon Nov 3 05:18:29 EST 2008