batgrbproduct Analysis for Trigger=240801
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 13:54:37 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger240801/GCN5_download_cron
======================================================================
Trigger: 00240801 Segment: 000
BAT Trigger Time: 186239768.944 [s; MET]
Trigger Stop: 186239769.296 [s; MET]
UTC: 2006-11-26T13:16:07.348460 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 16 ms to TRIGTIME + 320 ms
BAT
RA: 286.816471920316 Dec: 9.31861256148646 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.49
Image Trigger?: NO
Rate S/N Ratio: 64.1872261435249 [ if not an image trigger ]
Image S/N Ratio: 14.49
Flight Position: [ source = BAT ]
RA: 286.816471920316 Dec: 9.31861256148646 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 286.812410377038 Dec: 9.33661461132041 [deg; J2000]
{ 19h 07m 15.0s , +09d 20' 11.8" }
+/- 1.52928620193158 [arcmin] (estimated 90% radius based on SNR)
+/- 0.680675402060097 [arcmin] (formal 1-sigma fit error)
SNR: 16.5791779929542
RA = 19h 7m 15.0s (286.812410 deg.)
Dec = 9d 20' 12" (9.336615 deg.)
Angular difference between Flight and Ground position is 1.106568 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 0.0200000107288361 +/- 0.0126491080018669
Measured from: 0.296000003814697
to: 0.316000014543533 [s; relative to TRIGTIME]
T50: 0.00400000810623169 +/- 0.00565684464005017
Measured from: 0.299999982118607
to: 0.303999990224838 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.187999993562698
to: 0.812000006437302 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.296000003814697
to: 0.324000000953674 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.028145 0.017861 0.007241 0.000695
0.002409 0.002069 0.001442 0.000701 [error]
Peak 0.028350 0.018178 0.007238 0.000652
0.002456 0.002096 0.001471 0.000704 [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 8.58e-09 5.62e-09 2.39e-09 1.40e-09 1.73e-08 1.80e-08 erg/cm2
Error 1.20e-09 7.95e-10 5.72e-10 5.62e-10 2.27e-09 2.45e-09 erg/cm2
Peak flux Power-law 8.98e+00 3.34e+00 7.17e-01 1.84e-01 1.32e+01 1.32e+01 ph/cm2/s
Error 1.28e+00 4.61e-01 1.65e-01 6.87e-02 1.70e+00 1.70e+00 ph/cm2/s
Fluence Cutoff-PL 7.94e-09 8.05e-09 2.57e-09 1.83e-10 1.87e-08 1.84e-08 erg/cm2
Error 1.33e-09 1.26e-09 9.85e-10 2.49e-10 2.38e-09 0.00e+00 erg/cm2
Peak flux Cutoff-PL 8.10e+00 4.78e+00 8.15e-01 3.03e-02 1.37e+01 1.37e+01 ph/cm2/s
Error 1.42e+00 7.21e-01 2.92e-01 3.93e-02 1.73e+00 1.73e+00 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 8.13e+00 4.75e+00 8.28e-01 3.36e-02 1.37e+01 1.37e+01 ph/cm2/s
Error 1.42e+00 6.66e-01 2.25e-01 3.48e-02 1.72e+00 1.73e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.229 0.207 - - 4.59e-02 8.73e-03 69.166 57
CPL 1.041 1.051 17.8 12.7 9.87e-01 3.17e+00 49.493 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.222 0.204 - - 4.05e-02 7.65e-03 72.868 57
CPL 0.973 1.058 18.6 11.1 9.47e-01 3.07e+00 52.170 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.028 0.296 0.324
T90 0.020 0.296 0.316
T50 0.004 0.300 0.304
Peak 1.000 -0.188 0.812
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
286.8124 +9.3366 0.0116 17.7 -69.3 0.0556 16.6 TRIG_00240801
------------------------------------------
Foreground time interval of the image:
0.280 0.308 (delta_t = 0.028 [sec])
Background time interval of the image:
-238.960 -111.670 (delta_t = 127.290 [sec])
-110.960 0.280 (delta_t = 111.240 [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 0.280 sec. to 0.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.22947 ( -0.193676 0.220492 )
Norm@50keV : 4.585912E-02 ( -8.793082E-03 8.669559E-03) )
------------------------------------------------------------
Chi-Squared = 69.16602 using 59 PHA bins.
Reduced chi-squared = 1.213439 for 57 degrees of freedom
Null hypothesis probability = 0.130
Photon flux (15-150 keV) in 2.8000E-02 sec: 14.9737 ( -1.9222 1.9244 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73002e-08 ( -2.27265e-09 2.27251e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.280 sec. to 0.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04072 ( -1.20334 0.899400 )
Epeak [keV] : 17.8228 ( -17.8128 7.63031 )
Norm@50keV : 0.986976 ( -0.986976 5.36220 )
------------------------------------------------------------
Chi-Squared = 49.49255 using 59 PHA bins.
Reduced chi-squared = 0.8837956 for 56 degrees of freedom
Null hypothesis probability = 0.718
Photon flux (15-150 keV) in 2.8000E-02 sec: 15.5592 ( -1.9518 1.951 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87305e-08 ( -2.38048e-09 2.37611e-09 ) ergs/cm2
Band function
Time interval is from 0.280 sec. to 0.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51168 ( -0.480310 0.410877 )
beta : -9.36460 ( )
Epeak [keV] : 13.3490 ( )
Norm@50keV : 0.439582 ( )
------------------------------------------------------------
Chi-Squared = 51.51043 using 59 PHA bins.
Reduced chi-squared = 0.9365532 for 55 degrees of freedom
Null hypothesis probability = 0.609
Photon flux (15-150 keV) in 2.8000E-02 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.280 sec. to 0.312 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.22218 ( -0.191401 0.217324 )
Norm@50keV : 4.052510E-02 ( -7.698651E-03 7.592473E-03) )
------------------------------------------------------------
Chi-Squared = 72.86820 using 59 PHA bins.
Reduced chi-squared = 1.278389 for 57 degrees of freedom
Null hypothesis probability = 7.661E-02
Photon flux (15-150 keV) in 3.2000E-02 sec: 13.1587 ( -1.6979 1.6984 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74026e-08 ( -2.28883e-09 2.29373e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.280 sec. to 0.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.972928 ( -1.20955 0.905542 )
Epeak [keV] : 18.6099 ( -14.8800 7.31803 )
Norm@50keV : 0.947490 ( -0.947490 5.18595 )
------------------------------------------------------------
Chi-Squared = 52.17035 using 59 PHA bins.
Reduced chi-squared = 0.9316134 for 56 degrees of freedom
Null hypothesis probability = 0.621
Photon flux (15-150 keV) in 3.2000E-02 sec: 13.7248 ( -1.7262 1.726 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89499e-08 ( -2.40608e-09 2.40397e-09 ) ergs/cm2
Band function
Time interval is from 0.280 sec. to 0.312 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.66258 ( -7.066965E-02 0.110435 )
beta : -9.25850 ( -0.741502 19.2585 )
Epeak [keV] : 8.89497 ( -4.64625 3.24373 )
Norm@50keV : 0.369783 ( -0.242430 5.51176 )
------------------------------------------------------------
Chi-Squared = 53.68254 using 59 PHA bins.
Reduced chi-squared = 0.9760463 for 55 degrees of freedom
Null hypothesis probability = 0.525
Photon flux (15-150 keV) in 3.2000E-02 sec: 13.7403 ( -1.7337 1.7111 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89244e-08 ( -2.28602e-09 2.33875e-09 ) ergs/cm2
Plot creation:
Wed Jan 2 14:28:34 EST 2008