batgrbproduct Analysis for Trigger=273106
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): Thu Dec 13 16:23:34 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger273106/GCN5_download_cron
======================================================================
Trigger: 00273106 Segment: 000
BAT Trigger Time: 196937603.136 [s; MET]
Trigger Stop: 196937604.16 [s; MET]
UTC: 2007-03-30T08:53:21.278760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 94.2726400628748 Dec: 9.15182631250402 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 11.08
Image Trigger?: NO
Rate S/N Ratio: 16.4924225024706 [ if not an image trigger ]
Image S/N Ratio: 11.08
Flight Position: [ source = BAT ]
RA: 94.2726400628748 Dec: 9.15182631250402 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 94.2417916783752 Dec: 9.15512323258433 [deg; J2000]
{ 06h 16m 58.0s , +09d 09' 18.4" }
+/- 2.30089875226563 [arcmin] (estimated 90% radius based on SNR)
+/- 1.02415553702904 [arcmin] (formal 1-sigma fit error)
SNR: 9.24957842767833
RA = 6h 16m 58.0s (94.241792 deg.)
Dec = 9d 9' 18" (9.155123 deg.)
Angular difference between Flight and Ground position is 1.838009 arcmin
Partial Coding Fraction: 0.3398438 [ including projection effects ]
Duration
T90: 7 +/- 2.23606797749979
Measured from: -3.13600000739098
to: 3.86399999260902 [s; relative to TRIGTIME]
T50: 3 +/- 1
Measured from: -1.13600000739098
to: 1.86399999260902 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -1.13600000739098
to: -0.136000007390976 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.13600000739098
to: 4.86399999260902 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.718429 0.099123 0.003577 -0.019391
0.029701 0.025790 0.024312 0.024991 [error]
Peak 0.104302 0.014873 0.003556 0.005407
0.010744 0.009122 0.008555 0.009025 [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 2.88e-07 5.83e-08 5.86e-09 6.44e-10 3.53e-07 3.54e-07 erg/cm2
Error 3.48e-08 1.41e-08 3.28e-09 6.30e-10 4.01e-08 4.02e-08 erg/cm2
Peak flux Power-law 1.37e+00 2.08e-01 1.44e-02 1.06e-03 1.60e+00 1.60e+00 ph/cm2/s
Error 2.65e-01 9.21e-02 1.72e-02 2.19e-03 3.08e-01 3.08e-01 ph/cm2/s
Fluence Cutoff-PL 2.88e-07 5.83e-08 5.85e-09 6.38e-10 3.53e-07 3.53e-07 erg/cm2
Error 3.48e-08 1.40e-08 3.27e-09 6.25e-10 4.01e-08 4.02e-08 erg/cm2
Peak flux Cutoff-PL 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
Fluence Band 2.84e-07 5.95e-08 4.48e-09 2.61e-10 3.51e-07 3.25e-07 erg/cm2
Error 3.25e-08 8.41e-09 1.81e-10 3.95e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.36e+00 2.16e-01 1.51e-02 1.07e-03 1.63e+00 1.34e+00 ph/cm2/s
Error 2.61e-01 8.72e-02 8.59e-03 1.41e-03 3.19e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.227 0.476 - - 7.32e-04 3.08e-04 38.429 57
CPL 1.519 0.000 2.8 0.0 8.01e-01 0.00e+00 33.512 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.854 0.826 - - 1.19e-03 1.22e-03 52.019 57
CPL 1.787 0.000 1.5 0.0 3.69e-01 0.00e+00 51.252 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 8.000 -3.136 4.864
T90 7.000 -3.136 3.864
T50 3.000 -1.136 1.864
Peak 1.000 -1.136 -0.136
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
94.2418 +9.1551 0.0208 43.5 13.2 0.7359 9.2 TRIG_00273106
------------------------------------------
Foreground time interval of the image:
-3.136 4.864 (delta_t = 8.000 [sec])
Background time interval of the image:
-10.136 -3.136 (delta_t = 7.000 [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 -3.136 sec. to 4.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.22668 ( -0.369488 0.582484 )
Norm@50keV : 7.322278E-04 ( -3.186428E-04 2.981393E-04) )
------------------------------------------------------------
Chi-Squared = 38.42903 using 59 PHA bins.
Reduced chi-squared = 0.6741936 for 57 degrees of freedom
Null hypothesis probability = 0.972
Photon flux (15-150 keV) in 8.000 sec: 1.41102 ( -0.16242 0.16259 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.52886e-07 ( -4.0132e-08 4.0164e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.136 sec. to 4.864 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51853 ( )
Epeak [keV] : 2.75300 ( )
Norm@50keV : 0.800864 ( )
------------------------------------------------------------
Chi-Squared = 33.51185 using 59 PHA bins.
but latest trial 0.647329 gives Chi-Squared = 0.183910
Reduced chi-squared = 0.5984259 for 56 degrees of freedom
Null hypothesis probability = 0.993
Photon flux (15-150 keV) in 8.000 sec: 1.40962 ( -0.16224 0.16239 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5271e-07 ( -4.00976e-08 4.01728e-08 ) ergs/cm2
Band function
Time interval is from -3.136 sec. to 4.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.33973 ( -0.660268 4.19535 )
beta : -5.31658 ( -0.482969 0.450999 )
Epeak [keV] : 322.453 ( -322.353 9677.55 )
Norm@50keV : 9.160772E-02 ( -3.488056E-02 4.740736E-02) )
------------------------------------------------------------
Chi-Squared = 38.32643 using 59 PHA bins.
Reduced chi-squared = 0.6968442 for 55 degrees of freedom
Null hypothesis probability = 0.957
Photon flux (15-150 keV) in 8.000 sec: 1.41005 ( -0.16288 0.1588 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51383e-07 ( -3.94624e-08 3.9504e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -1.136 sec. to -0.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.85381 ( -0.746351 0.905892 )
Norm@50keV : 1.189514E-03 ( -1.189514E-03 1.242002E-03) )
------------------------------------------------------------
Chi-Squared = 52.01879 using 59 PHA bins.
Reduced chi-squared = 0.9126104 for 57 degrees of freedom
Null hypothesis probability = 0.662
Photon flux (15-150 keV) in 1.000 sec: 1.59726 ( -0.30803 0.30829 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.17643e-08 ( -1.10395e-08 1.14734e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.136 sec. to -0.136 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78707 ( )
Epeak [keV] : 1.50558 ( )
Norm@50keV : 0.368980 ( )
------------------------------------------------------------
Chi-Squared = 51.25204 using 59 PHA bins.
but latest trial 0.714185 gives Chi-Squared = 46.1356
Reduced chi-squared = 0.9152150 for 56 degrees of freedom
Null hypothesis probability = 0.655
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -1.136 sec. to -0.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55563 ( -0.398876 0.535127 )
beta : -9.13930 ( -0.860690 4.89013 )
Epeak [keV] : 6.21044 ( -5.29469 2.05059 )
Norm@50keV : 9.494741E-02 ( -2.20883 834.123 )
------------------------------------------------------------
Chi-Squared = 62.88482 using 59 PHA bins.
Reduced chi-squared = 1.143360 for 55 degrees of freedom
Null hypothesis probability = 0.217
Photon flux (15-150 keV) in 1.000 sec: 1.63441 ( -0.32816 0.30976 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.1944e-08 ( -5.5329e-09 1.11501e-08 ) ergs/cm2
Plot creation:
Thu Dec 13 16:27:30 EST 2007