batgrbproduct Analysis for Trigger=238174
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 11:38:17 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger238174/GCN5_download_cron
======================================================================
Trigger: 00238174 Segment: 000
BAT Trigger Time: 184888727.104 [s; MET]
Trigger Stop: 184888731.2 [s; MET]
UTC: 2006-11-10T21:58:45.541260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 323.901585252738 Dec: 6.87708414719814 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.14
Image Trigger?: NO
Rate S/N Ratio: 16.3095064303001 [ if not an image trigger ]
Image S/N Ratio: 8.14
Flight Position: [ source = BAT ]
RA: 323.901585252738 Dec: 6.87708414719814 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 323.911635650989 Dec: 6.87364286428698 [deg; J2000]
{ 21h 35m 38.8s , +06d 52' 25.1" }
+/- 1.64783065526642 [arcmin] (estimated 90% radius based on SNR)
+/- 0.638282211402232 [arcmin] (formal 1-sigma fit error)
SNR: 14.9019557210974
RA = 21h 35m 38.8s (323.911636 deg.)
Dec = 6d 52' 25" (6.873643 deg.)
Angular difference between Flight and Ground position is 0.633293 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 133.988000035286 +/- 16.5615868732499
Measured from: -13.6840000152588
to: 120.304000020027 [s; relative to TRIGTIME]
T50: 60.9760000109673 +/- 10.0206117684012
Measured from: 0.175999999046326
to: 61.1520000100136 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.26399999856949
to: 4.26399999856949 [s; relative to TRIGTIME]
Total Fluence
Measured from: -16.4959999918938
to: 127.944000005722 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.359483 0.640011 0.655845 0.171479
0.053933 0.054927 0.048732 0.041865 [error]
Peak 0.011847 0.022733 0.018477 0.009960
0.004525 0.004881 0.004387 0.003811 [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 1.02e-07 2.50e-07 4.92e-07 2.40e-06 1.33e-06 3.24e-06 erg/cm2
Error 1.91e-08 2.73e-08 4.60e-08 5.45e-07 1.21e-07 5.62e-07 erg/cm2
Peak flux Power-law 9.78e-02 1.34e-01 1.36e-01 2.50e-01 4.48e-01 6.17e-01 ph/cm2/s
Error 5.25e-02 4.26e-02 3.46e-02 1.55e-01 1.09e-01 1.64e-01 ph/cm2/s
Fluence Cutoff-PL 9.94e-08 2.52e-07 4.98e-07 2.14e-06 1.33e-06 2.90e-06 erg/cm2
Error 2.29e-08 2.65e-08 5.43e-08 9.57e-07 1.17e-07 9.59e-07 erg/cm2
Peak flux Cutoff-PL 9.75e-02 1.34e-01 1.36e-01 2.48e-01 4.48e-01 6.16e-01 ph/cm2/s
Error 5.25e-02 4.26e-02 3.47e-02 1.55e-01 1.09e-01 1.63e-01 ph/cm2/s
Fluence Band 9.85e-08 2.50e-07 4.96e-07 2.17e-06 1.33e-06 2.85e-06 erg/cm2
Error 2.26e-08 2.86e-08 5.41e-08 9.56e-07 1.23e-07 9.64e-07 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.024 0.160 - - 8.58e-04 7.43e-05 68.194 57
CPL 0.790 0.000 306.4 0.0 1.08e-03 4.64e-04 68.341 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.982 0.476 - - 3.89e-03 9.35e-04 54.852 57
CPL 0.976 0.480 9993.3 5000.0 3.92e-03 9.38e-04 54.862 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: 38.848000 sec.
T50 in the 50-300 keV band: 13.184000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 144.440 -16.496 127.944
T90 133.988 -13.684 120.304
T50 60.976 0.176 61.152
Peak 1.000 3.264 4.264
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
323.9116 +6.8736 0.0129 15.4 -25.2 1.7645 14.9 TRIG_00238174
------------------------------------------
Foreground time interval of the image:
-16.496 103.897 (delta_t = 120.393 [sec])
Background time interval of the image:
-239.104 -16.496 (delta_t = 222.608 [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 -16.496 sec. to 127.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02407 ( -0.162483 0.158059 )
Norm@50keV : 8.584924E-04 ( -7.461116E-05 7.404725E-05) )
------------------------------------------------------------
Chi-Squared = 68.19353 using 59 PHA bins.
Reduced chi-squared = 1.196378 for 57 degrees of freedom
Null hypothesis probability = 0.147
Photon flux (15-150 keV) in 144.4 sec: 9.897336E-02 ( -0.00884441 0.00889164 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32917e-06 ( -1.20545e-07 1.21186e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -16.496 sec. to 127.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.790142 ( )
Epeak [keV] : 306.376 ( )
Norm@50keV : 1.083154E-03 ( -1.836169E-04 7.453492E-04) )
------------------------------------------------------------
Chi-Squared = 68.34128 using 59 PHA bins.
Reduced chi-squared = 1.220380 for 56 degrees of freedom
Null hypothesis probability = 0.125
Photon flux (15-150 keV) in 144.4 sec: 9.894418E-02 ( -0.00884444 0.00888782 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32609e-06 ( -1.16141e-07 1.18268e-07 ) ergs/cm2
Band function
Time interval is from -16.496 sec. to 127.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.906417 ( -9.09358 3.85815 )
beta : -1.02407 ( -0.158064 0.162483 )
Epeak [keV] : 36.5390 ( -36.4390 9963.46 )
Norm@50keV : 1.302485E-03 ( -5.172320E-04 194.889 )
------------------------------------------------------------
Chi-Squared = 68.19353 using 59 PHA bins.
Reduced chi-squared = 1.239882 for 55 degrees of freedom
Null hypothesis probability = 0.109
Photon flux (15-150 keV) in 144.4 sec: 9.863450E-02 ( -0.0092008 0.0091135 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32552e-06 ( -1.24528e-07 1.21641e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.264 sec. to 4.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.981546 ( -0.501152 0.451398 )
Norm@50keV : 3.892455E-03 ( -9.478228E-04 9.218799E-04) )
------------------------------------------------------------
Chi-Squared = 54.85205 using 59 PHA bins.
Reduced chi-squared = 0.9623168 for 57 degrees of freedom
Null hypothesis probability = 0.556
Photon flux (15-150 keV) in 1.000 sec: 0.447783 ( -0.109163 0.109682 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.23847e-08 ( -1.08121e-08 1.08972e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.264 sec. to 4.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.976018 ( -0.505618 0.454493 )
Epeak [keV] : 9993.30 ( -9993.29 6.70117 )
Norm@50keV : 3.916275E-03 ( -9.499546E-04 9.257505E-04) )
------------------------------------------------------------
Chi-Squared = 54.86202 using 59 PHA bins.
Reduced chi-squared = 0.9796790 for 56 degrees of freedom
Null hypothesis probability = 0.518
Photon flux (15-150 keV) in 1.000 sec: 0.447579 ( -0.109088 0.109678 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.23936e-08 ( -1.08099e-08 1.09124e-08 ) ergs/cm2
Band function
Time interval is from 3.264 sec. to 4.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.872757 ( -9.12724 5.87276 )
beta : -0.981602 ( -0.452157 0.501281 )
Epeak [keV] : 30.7251 ( -30.6251 9969.27 )
Norm@50keV : 5.901392E-03 ( -2.917707E-03 1481.80 )
------------------------------------------------------------
Chi-Squared = 54.85206 using 59 PHA bins.
Reduced chi-squared = 0.9973102 for 55 degrees of freedom
Null hypothesis probability = 0.480
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Jan 2 11:56:49 EST 2008