batgrbproduct Analysis for Trigger=156434
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 9 12:53:58 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger156434/SDC
======================================================================
Trigger: 00156434 Segment: 000
BAT Trigger Time: 149094120 [s; MET]
Trigger Stop: 149094288 [s; MET]
UTC: 2005-09-22T15:02:00.257060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 5.79986495504588 Dec: -5.59886385721478 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.66
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.66
Flight Position: [ source = BAT ]
RA: 5.79986495504588 Dec: -5.59886385721478 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 5.79223199576637 Dec: -5.60937106733388 [deg; J2000]
{ 00h 23m 10.1s , -05d 36' 33.7" }
+/- 2.64006063241174 [arcmin] (estimated 90% radius based on SNR)
+/- 0.806070242958911 [arcmin] (formal 1-sigma fit error)
SNR: 7.59998625715182
RA = 0h 23m 10.1s (5.792232 deg.)
Dec = -5d 36' 34" (-5.609371 deg.)
Angular difference between Flight and Ground position is 0.777939 arcmin
Partial Coding Fraction: 0.1162109 [ including projection effects ]
Duration
T90: 150.848000019789 +/- 93.6613105076492
Measured from: 33.6719999909401
to: 184.520000010729 [s; relative to TRIGTIME]
T50: 35.3920000195503 +/- 186.249635498771
Measured from: 42.1839999854565
to: 77.5760000050068 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 98.6119999885559
to: 99.6119999885559 [s; relative to TRIGTIME]
Total Fluence
Measured from: 31.3039999902248
to: 273.416000008583 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.636825 1.575452 0.712110 0.075434
0.186215 0.188586 0.168589 0.154668 [error]
Peak 0.032585 0.044064 0.046643 -0.007344
0.014362 0.014222 0.012980 0.011657 [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 5.84e-07 7.09e-07 6.24e-07 9.45e-07 2.25e-06 2.86e-06 erg/cm2
Error 1.03e-07 9.52e-08 1.56e-07 4.58e-07 3.56e-07 6.46e-07 erg/cm2
Peak flux Power-law 3.03e-01 3.31e-01 2.57e-01 3.28e-01 1.01e+00 1.22e+00 ph/cm2/s
Error 1.92e-01 1.33e-01 9.52e-02 2.53e-01 3.65e-01 4.06e-01 ph/cm2/s
Fluence Cutoff-PL 5.64e-07 7.56e-07 6.00e-07 3.75e-07 2.14e-06 2.29e-06 erg/cm2
Error 8.42e-08 1.30e-07 1.84e-07 6.54e-07 3.99e-07 8.35e-07 erg/cm2
Peak flux Cutoff-PL 2.49e-01 3.42e-01 2.83e-01 1.94e-01 9.83e-01 1.07e+00 ph/cm2/s
Error 2.31e-01 1.48e-01 1.27e-01 3.05e-01 3.76e-01 4.86e-01 ph/cm2/s
Fluence Band 5.59e-07 7.53e-07 5.99e-07 3.72e-07 2.13e-06 2.29e-06 erg/cm2
Error 1.11e-07 1.30e-07 1.83e-07 6.42e-07 4.01e-07 8.35e-07 erg/cm2
Peak flux Band 2.49e-01 3.42e-01 2.83e-01 1.95e-01 9.84e-01 1.07e+00 ph/cm2/s
Error 2.33e-01 1.51e-01 1.28e-01 3.05e-01 3.76e-01 4.82e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.184 0.262 - - 9.89e-04 1.79e-04 51.473 57
CPL 1.479 0.883 29.5 5000.0 2.58e-03 5.90e-03 50.772 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.364 0.582 - - 8.39e-03 2.80e-03 44.058 57
CPL 0.652 2.670 112.0 5000.0 1.72e-02 1.91e-01 43.739 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 242.112 31.304 273.416
T90 150.848 33.672 184.520
T50 35.392 42.184 77.576
Peak 1.000 98.612 99.612
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
5.7922 -5.6094 0.0255 37.6 98.3 3.1999 7.6 TRIG_00156434
------------------------------------------
Foreground time interval of the image:
31.304 181.405 (delta_t = 150.101 [sec])
Background time interval of the image:
-299.000 31.304 (delta_t = 330.304 [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 31.304 sec. to 273.416 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.18438 ( -0.250744 0.272393 )
Norm@50keV : 9.891687E-04 ( -1.817706E-04 1.766622E-04) )
------------------------------------------------------------
Chi-Squared = 51.47287 using 59 PHA bins.
Reduced chi-squared = 0.9030328 for 57 degrees of freedom
Null hypothesis probability = 0.682
Photon flux (15-150 keV) in 242.1 sec: 0.162427 ( -0.021086 0.02109 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24725e-06 ( -3.51406e-07 3.61475e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.304 sec. to 273.416 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47937 ( -1.08065 0.685145 )
Epeak [keV] : 29.5400 ( -29.5300 9970.46 )
Norm@50keV : 2.582342E-03 ( -2.582342E-03 9.213593E-03) )
------------------------------------------------------------
Chi-Squared = 50.77242 using 59 PHA bins.
but latest trial 2.06982 gives Chi-Squared = 1.34513
Reduced chi-squared = 0.9066504 for 56 degrees of freedom
Null hypothesis probability = 0.672
Photon flux (15-150 keV) in 242.1 sec: 0.159763 ( -0.021688 0.021666 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13801e-06 ( -3.88767e-07 4.08398e-07 ) ergs/cm2
Band function
Time interval is from 31.304 sec. to 273.416 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.75312 ( -8.24688 0.562312 )
beta : -8.70094 ( -1.29906 6.73041 )
Epeak [keV] : 23.4574 ( -23.3574 9976.54 )
Norm@50keV : 1.774330E-03 ( -7.662816E-04 1.037464E-02) )
------------------------------------------------------------
Chi-Squared = 50.71916 using 59 PHA bins.
Reduced chi-squared = 0.9221666 for 55 degrees of freedom
Null hypothesis probability = 0.639
Photon flux (15-150 keV) in 242.1 sec: 0.159763 ( -0.021688 0.021668 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1339e-06 ( -3.87672e-07 4.1478e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 98.632 sec. to 99.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36410 ( -0.589348 0.574143 )
Norm@50keV : 8.387469E-03 ( -2.805554E-03 2.796933E-03) )
------------------------------------------------------------
Chi-Squared = 44.05841 using 59 PHA bins.
Reduced chi-squared = 0.7729546 for 57 degrees of freedom
Null hypothesis probability = 0.895
Photon flux (15-150 keV) in 0.9600 sec: 1.01343 ( -0.36179 0.36838 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.84047e-08 ( -2.70291e-08 2.72346e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 98.632 sec. to 99.592 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.652338 ( -3.62763 1.71270 )
Epeak [keV] : 112.018 ( -112.008 9887.98 )
Norm@50keV : 1.717406E-02 ( -1.717406E-02 0.364373 )
------------------------------------------------------------
Chi-Squared = 43.73881 using 59 PHA bins.
but latest trial -27.7194 gives Chi-Squared = 3.83828
but latest trial 2.37097 gives Chi-Squared = 3.80517
Reduced chi-squared = 0.7810501 for 56 degrees of freedom
Null hypothesis probability = 0.883
Photon flux (15-150 keV) in 0.9600 sec: 0.983379 ( -0.373733 0.379101 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.76054e-08 ( -2.78369e-08 2.76518e-08 ) ergs/cm2
Band function
Time interval is from 98.632 sec. to 99.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.657312 ( -4.84988 3.89809 )
beta : -9.14985 ( -0.850149 8.33469 )
Epeak [keV] : 112.482 ( -112.382 9887.52 )
Norm@50keV : 1.707884E-02 ( -1.707884E-02 0.337119 )
------------------------------------------------------------
Chi-Squared = 43.73882 using 59 PHA bins.
Reduced chi-squared = 0.7952512 for 55 degrees of freedom
Null hypothesis probability = 0.863
Photon flux (15-150 keV) in 0.9600 sec: 0.983606 ( -0.3736 0.379304 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.75851e-08 ( -2.78422e-08 2.75954e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 13:09:51 EST 2008