batgrbproduct Analysis for Trigger=240766
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 Jan 2 13:32:08 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger240766/GCN5_download_cron
======================================================================
Trigger: 00240766 Segment: 000
BAT Trigger Time: 186223678.016 [s; MET]
Trigger Stop: 186223679.04 [s; MET]
UTC: 2006-11-26T08:47:56.420860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 86.6247167166277 Dec: 64.1900414481625 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.76
Image Trigger?: NO
Rate S/N Ratio: 24.6170672501823 [ if not an image trigger ]
Image S/N Ratio: 8.76
Flight Position: [ source = BAT ]
RA: 86.6247167166277 Dec: 64.1900414481625 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 86.6193225338992 Dec: 64.2061378979086 [deg; J2000]
{ 05h 46m 28.6s , +64d 12' 22.1" }
+/- 0.835427204024627 [arcmin] (estimated 90% radius based on SNR)
+/- 0.26870108528376 [arcmin] (formal 1-sigma fit error)
SNR: 39.3257943814216
RA = 5h 46m 28.6s (86.619323 deg.)
Dec = 64d 12' 22" (64.206138 deg.)
Angular difference between Flight and Ground position is 0.976007 arcmin
Partial Coding Fraction: 0.4921875 [ including projection effects ]
Duration
T90: 70.8400000035763 +/- 39.6643370737229
Measured from: -1.15999999642372
to: 69.6800000071526 [s; relative to TRIGTIME]
T50: 15.2800000309944 +/- 0.458955345356491
Measured from: 6.03599998354912
to: 21.3160000145435 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.66400000452995
to: 7.66400000452995 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.0160000026226
to: 163.379999995232 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.288149 3.395590 3.195400 0.882758
0.092208 0.094978 0.087193 0.075249 [error]
Peak 0.191466 0.397303 0.471685 0.187696
0.010756 0.013677 0.014996 0.012820 [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 7.46e-07 1.53e-06 2.44e-06 8.69e-06 6.77e-06 1.34e-05 erg/cm2
Error 5.13e-08 6.05e-08 8.77e-08 7.45e-07 2.21e-07 7.77e-07 erg/cm2
Peak flux Power-law 2.00e+00 2.86e+00 3.04e+00 5.98e+00 9.76e+00 1.39e+01 ph/cm2/s
Error 1.69e-01 1.44e-01 1.18e-01 5.33e-01 3.75e-01 5.77e-01 ph/cm2/s
Fluence Cutoff-PL 6.90e-07 1.55e-06 2.51e-06 6.29e-06 6.69e-06 1.08e-05 erg/cm2
Error 6.93e-08 6.42e-08 1.08e-07 1.33e-06 2.35e-07 1.82e-06 erg/cm2
Peak flux Cutoff-PL 1.99e+00 2.86e+00 3.04e+00 5.94e+00 9.75e+00 1.38e+01 ph/cm2/s
Error 1.69e-01 1.44e-01 1.18e-01 5.30e-01 3.75e-01 5.75e-01 ph/cm2/s
Fluence Band 6.85e-07 1.54e-06 2.51e-06 6.27e-06 6.68e-06 1.10e-05 erg/cm2
Error 6.85e-08 6.40e-08 1.09e-07 1.84e-06 2.36e-07 2.17e-06 erg/cm2
Peak flux Band 1.92e+00 2.87e+00 3.09e+00 5.24e+00 9.71e+00 1.31e+01 ph/cm2/s
Error 2.25e-01 1.48e-01 1.59e-01 1.17e+00 3.87e-01 1.22e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.324 0.060 - - 4.07e-03 1.29e-04 41.599 57
CPL 1.021 0.259 188.9 777.7 5.49e-03 1.35e-03 38.099 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.912 0.069 - - 8.50e-02 3.25e-03 59.433 57
CPL 0.812 0.240 729.7 5000.0 9.36e-02 1.93e-02 58.719 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: 23.424000 sec.
T50 in the 50-300 keV band: 7.552000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 169.396 -6.016 163.380
T90 70.840 -1.160 69.680
T50 15.280 6.036 21.316
Peak 1.000 6.664 7.664
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
86.6193 +64.2061 0.0049 36.2 18.9 10.2168 39.3 TRIG_00240766
------------------------------------------
Foreground time interval of the image:
-6.016 163.380 (delta_t = 169.396 [sec])
Background time interval of the image:
-239.016 -89.786 (delta_t = 149.230 [sec])
-89.016 -6.016 (delta_t = 83.000 [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 -6.016 sec. to 163.380 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32396 ( -6.039846E-02 6.015790E-02) )
Norm@50keV : 4.067995E-03 ( -1.293318E-04 1.291758E-04) )
------------------------------------------------------------
Chi-Squared = 41.59927 using 59 PHA bins.
Reduced chi-squared = 0.7298117 for 57 degrees of freedom
Null hypothesis probability = 0.937
Photon flux (15-150 keV) in 169.4 sec: 0.487530 ( -0.017295 0.017368 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.77082e-06 ( -2.2105e-07 2.21474e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.016 sec. to 163.380 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02081 ( -0.238081 0.279114 )
Epeak [keV] : 188.948 ( -57.3869 1498.06 )
Norm@50keV : 5.485049E-03 ( -1.281515E-03 1.425968E-03) )
------------------------------------------------------------
Chi-Squared = 38.09885 using 59 PHA bins.
Reduced chi-squared = 0.6803366 for 56 degrees of freedom
Null hypothesis probability = 0.968
Photon flux (15-150 keV) in 169.4 sec: 0.478472 ( -0.018868 0.009541 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.69017e-06 ( -2.36686e-07 2.33941e-07 ) ergs/cm2
Band function
Time interval is from -6.016 sec. to 163.380 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.996509 ( -0.188652 0.324175 )
beta : -1.61326 ( -7.45323 1.21192 )
Epeak [keV] : 175.266 ( -97.6628 1439.18 )
Norm@50keV : 5.661227E-03 ( -1.056368E-03 1.629588E-03) )
------------------------------------------------------------
Chi-Squared = 38.15047 using 59 PHA bins.
Reduced chi-squared = 0.6936449 for 55 degrees of freedom
Null hypothesis probability = 0.959
Photon flux (15-150 keV) in 169.4 sec: 0.478498 ( -0.018933 0.019022 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.68463e-06 ( -2.36855e-07 2.35347e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 6.664 sec. to 7.664 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.912343 ( -6.970829E-02 6.898987E-02) )
Norm@50keV : 8.498561E-02 ( -3.251836E-03 3.240496E-03) )
------------------------------------------------------------
Chi-Squared = 59.43335 using 59 PHA bins.
Reduced chi-squared = 1.042690 for 57 degrees of freedom
Null hypothesis probability = 0.387
Photon flux (15-150 keV) in 1.000 sec: 9.75579 ( -0.37509 0.37561 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.4925e-07 ( -3.7742e-08 3.7828e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.664 sec. to 7.664 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.811940 ( -0.326560 0.154377 )
Epeak [keV] : 729.682 ( -729.672 9270.32 )
Norm@50keV : 9.359750E-02 ( -5.196065E-03 3.348350E-02) )
------------------------------------------------------------
Chi-Squared = 58.71917 using 59 PHA bins.
but latest trial 8.840138E-02 gives Chi-Squared = 2.40379
Reduced chi-squared = 1.048557 for 56 degrees of freedom
Null hypothesis probability = 0.376
Photon flux (15-150 keV) in 1.000 sec: 9.75323 ( -0.37501 0.37547 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.4665e-07 ( -3.7095e-08 3.8314e-08 ) ergs/cm2
Band function
Time interval is from 6.664 sec. to 7.664 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.806898 ( -9.19310 5.80484 )
beta : -0.912343 ( -6.898743E-02 6.971270E-02) )
Epeak [keV] : 29.8921 ( -9999.90 3.906250E-03) )
Norm@50keV : 0.128766 ( -3.262565E-03 3.250822E-03) )
------------------------------------------------------------
Chi-Squared = 59.43334 using 59 PHA bins.
Reduced chi-squared = 1.080606 for 55 degrees of freedom
Null hypothesis probability = 0.317
Photon flux (15-150 keV) in 1.000 sec: 9.70538 ( -0.38647 0.38712 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.46014e-07 ( -3.8769e-08 3.8435e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 13:52:35 EST 2008