batgrbproduct Analysis for Trigger=144067
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 Jan 7 12:29:48 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger144067/SDC
======================================================================
Trigger: 00144067 Segment: 000
BAT Trigger Time: 142115362.24 [s; MET]
Trigger Stop: 142115370.432 [s; MET]
UTC: 2005-07-03T20:29:22.636280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 256.570253153522 Dec: -43.058653121366 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.57
Image Trigger?: NO
Rate S/N Ratio: 12.6095202129185 [ if not an image trigger ]
Image S/N Ratio: 8.57
Flight Position: [ source = BAT ]
RA: 256.570253153522 Dec: -43.058653121366 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 256.547899888104 Dec: -42.9565613638385 [deg; J2000]
{ 17h 06m 11.5s , -42d 57' 23.6" }
+/- 3.38535840834204 [arcmin] (estimated 90% radius based on SNR)
+/- 2.62515989468369 [arcmin] (formal 1-sigma fit error)
SNR: 5.32770663061863
RA = 17h 6m 11.5s (256.547900 deg.)
Dec = -42d 57' 24" (-42.956561 deg.)
Angular difference between Flight and Ground position is 6.203525 arcmin
Partial Coding Fraction: 0.5625 [ including projection effects ]
Duration
T90: 5 +/- 2.23606797749979
Measured from: 1.75999999046326
to: 6.75999999046326 [s; relative to TRIGTIME]
T50: 3 +/- 1.4142135623731
Measured from: 2.75999999046326
to: 5.75999999046326 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.75999999046326
to: 5.75999999046326 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.75999999046326
to: 7.75999999046326 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.165263 0.027441 0.014977 0.005154
0.017212 0.015132 0.012895 0.011377 [error]
Peak 0.040962 0.000805 0.002996 -0.001744
0.007190 0.006320 0.005282 0.004745 [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 5.40e-08 1.62e-08 2.65e-09 5.00e-10 7.31e-08 7.33e-08 erg/cm2
Error 1.01e-08 7.41e-09 2.76e-09 1.02e-09 1.65e-08 1.67e-08 erg/cm2
Peak flux Power-law 4.11e-01 7.25e-02 6.12e-03 5.57e-04 4.90e-01 4.90e-01 ph/cm2/s
Error 1.20e-01 5.19e-02 1.09e-02 2.19e-03 1.58e-01 1.58e-01 ph/cm2/s
Fluence Cutoff-PL 5.40e-08 1.62e-08 2.65e-09 4.97e-10 7.31e-08 7.33e-08 erg/cm2
Error 1.01e-08 7.42e-09 2.76e-09 1.01e-09 1.65e-08 1.67e-08 erg/cm2
Peak flux Cutoff-PL 4.11e-01 5.37e-02 6.27e-05 1.90e-11 5.17e-01 4.90e-01 ph/cm2/s
Error 5.02e-02 6.13e-03 3.78e-05 1.50e-01 1.58e-01 0.00e+00 ph/cm2/s
Fluence Band 5.32e-08 1.69e-08 2.95e-09 5.89e-10 7.45e-08 7.70e-08 erg/cm2
Error 9.92e-09 5.23e-09 1.03e-09 1.51e-08 1.44e-08 0.00e+00 erg/cm2
Peak flux Band 4.31e-01 6.97e-02 1.71e-03 1.91e-05 5.02e-01 5.02e-01 ph/cm2/s
Error 1.24e-01 4.10e-02 1.44e-03 6.83e-04 1.54e-01 1.59e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.642 0.801 - - 3.33e-04 3.45e-04 64.486 57
CPL 1.724 0.000 2.1 5.1 7.62e-02 1.32e+02 63.254 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.568 1.284 - - 4.76e-04 6.71e-04 56.515 57
CPL 0.205 0.000 9.0 17.4 1.60e+00 1.93e+03 54.984 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 6.000 1.760 7.760
T90 5.000 1.760 6.760
T50 3.000 2.760 5.760
Peak 1.000 4.760 5.760
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
256.5479 -42.9566 0.0362 24.3 72.6 0.1931 5.3 TRIG_00144067
------------------------------------------
Foreground time interval of the image:
1.760 7.760 (delta_t = 6.000 [sec])
Background time interval of the image:
-10.240 1.760 (delta_t = 12.000 [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 1.760 sec. to 7.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.64198 ( -0.759836 0.841900 )
Norm@50keV : 3.330717E-04 ( -3.330717E-04 3.579144E-04) )
------------------------------------------------------------
Chi-Squared = 64.48582 using 59 PHA bins.
Reduced chi-squared = 1.131330 for 57 degrees of freedom
Null hypothesis probability = 0.231
Photon flux (15-150 keV) in 6.000 sec: 0.367534 ( -0.070527 0.070712 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.3143e-08 ( -1.59978e-08 1.70358e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.760 sec. to 7.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72396 ( )
Epeak [keV] : 2.07743 ( -7.01978 3.09206 )
Norm@50keV : 7.615430E-02 ( -0.470861 263.343 )
------------------------------------------------------------
Chi-Squared = 63.25359 using 59 PHA bins.
Reduced chi-squared = 1.129528 for 56 degrees of freedom
Null hypothesis probability = 0.236
Photon flux (15-150 keV) in 6.000 sec: 0.368647 ( -0.068634 0.068745 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.31388e-08 ( -1.60148e-08 1.70178e-08 ) ergs/cm2
Band function
Time interval is from 1.760 sec. to 7.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.56531 ( -3.93942 3.36794 )
beta : -3.56672 ( -0.873855 0.725197 )
Epeak [keV] : 8.22018 ( -8.12018 9991.78 )
Norm@50keV : 1.371753E-02 ( -2.843391E-02 4.712803E-02) )
------------------------------------------------------------
Chi-Squared = 80.51204 using 59 PHA bins.
Reduced chi-squared = 1.463855 for 55 degrees of freedom
Null hypothesis probability = 1.407E-02
Photon flux (15-150 keV) in 6.000 sec: 0.368207 ( -0.069721 0.069252 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.4517e-08 ( -1.50726e-08 1.51878e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 4.760 sec. to 5.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.56847 ( -1.05805 1.51063 )
Norm@50keV : 4.763199E-04 ( -4.763199E-04 8.656050E-04) )
------------------------------------------------------------
Chi-Squared = 56.51471 using 59 PHA bins.
Reduced chi-squared = 0.9914861 for 57 degrees of freedom
Null hypothesis probability = 0.493
Photon flux (15-150 keV) in 1.000 sec: 0.489901 ( -0.156388 0.158797 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63162e-08 ( -5.9744e-09 6.8657e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.760 sec. to 5.760 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.205433 ( )
Epeak [keV] : 8.95916 ( -14.2053 20.5943 )
Norm@50keV : 1.59895 ( -632.418 3233.58 )
------------------------------------------------------------
Chi-Squared = 54.98377 using 59 PHA bins.
but latest trial 29.5385 gives Chi-Squared = 21.7531
Reduced chi-squared = 0.9818531 for 56 degrees of freedom
Null hypothesis probability = 0.513
Photon flux (15-150 keV) in 1.000 sec: 0.516826 ( -0.14999 0.150141 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63e-08 ( -5.1058e-09 5.2601e-09 ) ergs/cm2
Band function
Time interval is from 4.760 sec. to 5.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.54995 ( -0.445596 0.582186 )
beta : -3.30164 ( -1.50738 13.5924 )
Epeak [keV] : 11.9616 ( -11.8616 9988.04 )
Norm@50keV : 1.293763E-02 ( -6.466047E-02 0.117714 )
------------------------------------------------------------
Chi-Squared = 67.33300 using 59 PHA bins.
Reduced chi-squared = 1.224236 for 55 degrees of freedom
Null hypothesis probability = 0.123
Photon flux (15-150 keV) in 1.000 sec: 0.502433 ( -0.155799 0.15245 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62042e-08 ( -5.5278e-09 6.1742e-09 ) ergs/cm2
Plot creation:
Mon Jan 7 12:37:03 EST 2008