batgrbproduct Analysis for Trigger=286574
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): Fri Dec 14 06:09:27 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger286574/GCN5_download_cron
======================================================================
Trigger: 00286574 Segment: 000
BAT Trigger Time: 207567204.8 [s; MET]
Trigger Stop: 207567205.312 [s; MET]
UTC: 2007-07-31T09:33:22.676340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 328.569634421567 Dec: -15.7454090771216 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.54
Image Trigger?: NO
Rate S/N Ratio: 13.7840487520902 [ if not an image trigger ]
Image S/N Ratio: 7.54
Flight Position: [ source = BAT ]
RA: 328.569634421567 Dec: -15.7454090771216 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 328.581566976311 Dec: -15.7405203676086 [deg; J2000]
{ 21h 54m 19.6s , -15d 44' 25.9" }
+/- 1.9307068221876 [arcmin] (estimated 90% radius based on SNR)
+/- 0.639864150022966 [arcmin] (formal 1-sigma fit error)
SNR: 11.8837140358226
RA = 21h 54m 19.6s (328.581567 deg.)
Dec = -15d 44' 26" (-15.740520 deg.)
Angular difference between Flight and Ground position is 0.748928 arcmin
Partial Coding Fraction: 0.4921875 [ including projection effects ]
Duration
T90: 2.69200003147125 +/- 0.399824972322227
Measured from: 0.119999974966049
to: 2.8120000064373 [s; relative to TRIGTIME]
T50: 1.82800000905991 +/- 0.646727153850846
Measured from: 0.227999985218048
to: 2.05599999427795 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.144000023603439
to: 0.855999976396561 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.144000023603439
to: 2.97599998116493 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.082340 0.110236 0.070060 0.013946
0.012330 0.012880 0.011551 0.009472 [error]
Peak 0.039751 0.052412 0.045112 0.011198
0.007142 0.007654 0.007149 0.005581 [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 2.53e-08 4.26e-08 5.43e-08 1.39e-07 1.61e-07 2.63e-07 erg/cm2
Error 5.33e-09 5.93e-09 1.09e-08 5.66e-08 2.60e-08 6.69e-08 erg/cm2
Peak flux Power-law 3.46e-01 3.80e-01 2.98e-01 3.84e-01 1.17e+00 1.41e+00 ph/cm2/s
Error 9.37e-02 6.43e-02 5.66e-02 1.50e-01 1.83e-01 2.27e-01 ph/cm2/s
Fluence Cutoff-PL 2.27e-08 4.82e-08 5.58e-08 3.56e-08 1.49e-07 1.67e-07 erg/cm2
Error 6.17e-09 8.23e-09 1.29e-08 5.71e-08 2.81e-08 6.72e-08 erg/cm2
Peak flux Cutoff-PL 3.01e-01 4.05e-01 3.21e-01 1.95e-01 1.14e+00 1.22e+00 ph/cm2/s
Error 1.13e-01 7.68e-02 6.87e-02 2.11e-01 1.88e-01 2.89e-01 ph/cm2/s
Fluence Band 2.22e-08 4.80e-08 5.57e-08 3.57e-08 1.49e-07 1.65e-07 erg/cm2
Error 6.11e-09 8.22e-09 1.29e-08 5.78e-08 2.81e-08 6.07e-08 erg/cm2
Peak flux Band 3.01e-01 4.05e-01 3.20e-01 1.96e-01 1.14e+00 1.22e+00 ph/cm2/s
Error 1.13e-01 7.68e-02 6.87e-02 2.36e-01 1.88e-01 2.86e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.649 0.236 - - 5.54e-03 8.37e-04 70.322 57
CPL 0.631 1.135 62.1 121.6 1.96e-02 4.90e-02 67.127 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.353 0.263 - - 9.68e-03 1.51e-03 68.380 57
CPL 0.646 1.101 100.6 4968.5 2.14e-02 3.99e-02 66.994 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: 1.088000 sec.
T50 in the 50-300 keV band: 0.640000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 3.120 -0.144 2.976
T90 2.692 0.120 2.812
T50 1.828 0.228 2.056
Peak 1.000 -0.144 0.856
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
328.5816 -15.7405 0.0162 26.3 107.7 0.2846 11.9 TRIG_00286574
------------------------------------------
Foreground time interval of the image:
-0.144 2.976 (delta_t = 3.120 [sec])
Background time interval of the image:
-239.800 -188.080 (delta_t = 51.720 [sec])
-186.800 -0.144 (delta_t = 186.656 [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 -0.144 sec. to 2.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64877 ( -0.231378 0.240252 )
Norm@50keV : 5.538869E-03 ( -8.445336E-04 8.292194E-04) )
------------------------------------------------------------
Chi-Squared = 70.32228 using 59 PHA bins.
Reduced chi-squared = 1.233724 for 57 degrees of freedom
Null hypothesis probability = 0.111
Photon flux (15-150 keV) in 3.120 sec: 0.722954 ( -0.100485 0.100539 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6079e-07 ( -2.58099e-08 2.62018e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.144 sec. to 2.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.631285 ( -1.29383 0.976978 )
Epeak [keV] : 62.0846 ( -15.9619 227.198 )
Norm@50keV : 1.964860E-02 ( -1.964859E-02 7.844649E-02) )
------------------------------------------------------------
Chi-Squared = 67.12670 using 59 PHA bins.
Reduced chi-squared = 1.198691 for 56 degrees of freedom
Null hypothesis probability = 0.147
Photon flux (15-150 keV) in 3.120 sec: 0.701508 ( -0.103067 0.102843 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49043e-07 ( -2.75586e-08 2.87352e-08 ) ergs/cm2
Band function
Time interval is from -0.144 sec. to 2.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.630985 ( -0.976519 0.999466 )
beta : -9.09501 ( -0.904986 7.49165 )
Epeak [keV] : 62.0232 ( -15.9382 225.532 )
Norm@50keV : 1.966879E-02 ( -1.966879E-02 7.867350E-02) )
------------------------------------------------------------
Chi-Squared = 67.12675 using 59 PHA bins.
Reduced chi-squared = 1.220486 for 55 degrees of freedom
Null hypothesis probability = 0.126
Photon flux (15-150 keV) in 3.120 sec: 0.701393 ( -0.102941 0.102963 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48993e-07 ( -2.76036e-08 2.86494e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.144 sec. to 0.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35278 ( -0.262029 0.264092 )
Norm@50keV : 9.678149E-03 ( -1.516115E-03 1.509908E-03) )
------------------------------------------------------------
Chi-Squared = 68.38006 using 59 PHA bins.
Reduced chi-squared = 1.199650 for 57 degrees of freedom
Null hypothesis probability = 0.144
Photon flux (15-150 keV) in 1.000 sec: 1.16661 ( -0.182938 0.18321 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.44697e-08 ( -1.64253e-08 1.66273e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.144 sec. to 0.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.645955 ( -1.31266 0.888734 )
Epeak [keV] : 100.593 ( -37.5180 9899.41 )
Norm@50keV : 2.144827E-02 ( -1.280084E-02 6.696892E-02) )
------------------------------------------------------------
Chi-Squared = 66.99430 using 59 PHA bins.
Reduced chi-squared = 1.196327 for 56 degrees of freedom
Null hypothesis probability = 0.149
Photon flux (15-150 keV) in 1.000 sec: 1.14105 ( -0.187906 0.18735 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.12692e-08 ( -1.75142e-08 1.74868e-08 ) ergs/cm2
Band function
Time interval is from -0.144 sec. to 0.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.647765 ( -0.886288 1.21486 )
beta : -8.28847 ( -1.71153 5.16539 )
Epeak [keV] : 100.726 ( -54.2672 9899.27 )
Norm@50keV : 2.140179E-02 ( -1.275527E-02 0.162999 )
------------------------------------------------------------
Chi-Squared = 66.99436 using 59 PHA bins.
Reduced chi-squared = 1.218079 for 55 degrees of freedom
Null hypothesis probability = 0.129
Photon flux (15-150 keV) in 1.000 sec: 1.14120 ( -0.188058 0.18723 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.12009e-08 ( -1.74922e-08 1.74861e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 06:25:39 EST 2007