batgrbproduct Analysis for Trigger=238552
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 12:24:37 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger238552/GCN5_download_cron
======================================================================
Trigger: 00238552 Segment: 000
BAT Trigger Time: 185087216 [s; MET]
Trigger Stop: 185087280 [s; MET]
UTC: 2006-11-13T05:06:54.432480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 134.669165809837 Dec: -40.5858937890585 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.07
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.07
Flight Position: [ source = BAT ]
RA: 134.669165809837 Dec: -40.5858937890585 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 134.722718344245 Dec: -40.5934656667001 [deg; J2000]
{ 08h 58m 53.5s , -40d 35' 36.5" }
+/- 2.88351747139694 [arcmin] (estimated 90% radius based on SNR)
+/- 1.3379638064388 [arcmin] (formal 1-sigma fit error)
SNR: 6.7001744837229
RA = 8h 58m 53.5s (134.722718 deg.)
Dec = -40d 35' 36" (-40.593466 deg.)
Angular difference between Flight and Ground position is 2.481965 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.354836 0.199651 0.030750 -0.069710
0.042111 0.041365 0.037446 0.037021 [error]
Peak 0.354836 0.199651 0.030750 -0.069710
0.042111 0.041365 0.037446 0.037021 [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 9.75e-08 9.08e-08 5.86e-08 5.84e-08 2.71e-07 3.06e-07 erg/cm2
Error 1.99e-08 2.08e-08 2.64e-08 4.86e-08 6.55e-08 9.32e-08 erg/cm2
Peak flux Power-law 5.03e-02 2.62e-02 8.46e-03 3.51e-03 8.69e-02 8.84e-02 ph/cm2/s
Error 1.05e-02 5.78e-03 3.69e-03 3.47e-03 1.60e-02 1.65e-02 ph/cm2/s
Fluence Cutoff-PL 9.83e-08 1.07e-07 2.06e-08 3.03e-10 2.26e-07 2.26e-07 erg/cm2
Error 2.21e-08 2.83e-08 3.13e-08 1.20e-08 5.57e-08 5.67e-08 erg/cm2
Peak flux Cutoff-PL 4.96e-02 3.14e-02 3.34e-03 2.69e-05 8.43e-02 8.43e-02 ph/cm2/s
Error 1.15e-02 7.84e-03 4.63e-03 8.54e-04 1.53e-02 1.54e-02 ph/cm2/s
Fluence Band 9.74e-08 1.04e-07 3.11e-08 1.66e-09 2.35e-07 2.31e-07 erg/cm2
Error 1.47e-08 2.28e-08 1.40e-08 3.24e-08 4.32e-08 7.52e-08 erg/cm2
Peak flux Band 5.00e-02 3.05e-02 4.85e-03 1.39e-04 8.55e-02 8.53e-02 ph/cm2/s
Error 7.82e-03 6.63e-03 2.49e-03 2.08e-03 1.51e-02 1.52e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.630 0.405 - - 4.07e-04 1.38e-04 48.454 57
CPL 0.185 2.508 22.2 14.6 2.08e-02 0.00e+00 44.301 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.630 0.405 - - 4.07e-04 1.38e-04 48.454 57
CPL 0.185 2.508 22.2 14.6 2.08e-02 0.00e+00 44.301 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
134.7227 -40.5935 0.0288 20.6 0.9 0.5335 6.7 TRIG_00238552
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.63046 ( -0.374531 0.436322 )
Norm@50keV : 4.073438E-04 ( -1.347831E-04 1.407150E-04) )
------------------------------------------------------------
Chi-Squared = 48.45424 using 59 PHA bins.
Reduced chi-squared = 0.8500744 for 57 degrees of freedom
Null hypothesis probability = 0.783
Photon flux (15-150 keV) in 64.00 sec: 8.688959E-02 ( -0.0159532 0.0159924 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.70958e-07 ( -6.28877e-08 6.81165e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.184808 ( -3.18481 1.83028 )
Epeak [keV] : 22.1727 ( -22.1627 7.02724 )
Norm@50keV : 2.083988E-02 ( )
------------------------------------------------------------
Chi-Squared = 44.30104 using 59 PHA bins.
but latest trial 2.00577 gives Chi-Squared = 12.1203
Reduced chi-squared = 0.7910901 for 56 degrees of freedom
Null hypothesis probability = 0.871
Photon flux (15-150 keV) in 64.00 sec: 8.433061E-02 ( -0.0151334 0.0154835 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2571e-07 ( -4.88096e-08 6.2592e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39917 ( -2.15442 2.97659 )
beta : -9.34522 ( -0.654779 19.3452 )
Epeak [keV] : 15.6530 ( -15.5530 87.8599 )
Norm@50keV : 2.793314E-03 ( -6.336194E-02 90.7071 )
------------------------------------------------------------
Chi-Squared = 45.30715 using 59 PHA bins.
Reduced chi-squared = 0.8237664 for 55 degrees of freedom
Null hypothesis probability = 0.821
Photon flux (15-150 keV) in 64.00 sec: 8.548632E-02 ( -0.0151357 0.0151597 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35226e-07 ( -4.50074e-08 4.13165e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.63046 ( -0.374531 0.436322 )
Norm@50keV : 4.073438E-04 ( -1.347831E-04 1.407150E-04) )
------------------------------------------------------------
Chi-Squared = 48.45424 using 59 PHA bins.
Reduced chi-squared = 0.8500744 for 57 degrees of freedom
Null hypothesis probability = 0.783
Photon flux (15-150 keV) in 64.00 sec: 8.688959E-02 ( -0.0159532 0.0159924 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.70958e-07 ( -6.28877e-08 6.81165e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.184808 ( -3.18481 1.83028 )
Epeak [keV] : 22.1727 ( -22.1627 7.02724 )
Norm@50keV : 2.083988E-02 ( )
------------------------------------------------------------
Chi-Squared = 44.30104 using 59 PHA bins.
but latest trial 2.00577 gives Chi-Squared = 12.1203
Reduced chi-squared = 0.7910901 for 56 degrees of freedom
Null hypothesis probability = 0.871
Photon flux (15-150 keV) in 64.00 sec: 8.433061E-02 ( -0.0151334 0.0154835 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2571e-07 ( -4.88096e-08 6.2592e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39917 ( -1.19769 2.97659 )
beta : -9.34522 ( -0.654779 19.3452 )
Epeak [keV] : 15.6530 ( -15.5530 87.8599 )
Norm@50keV : 2.793314E-03 ( -6.336194E-02 90.7071 )
------------------------------------------------------------
Chi-Squared = 45.30715 using 59 PHA bins.
Reduced chi-squared = 0.8237664 for 55 degrees of freedom
Null hypothesis probability = 0.821
Photon flux (15-150 keV) in 64.00 sec: 8.548632E-02 ( -0.0151357 0.0151597 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35226e-07 ( -4.50074e-08 4.13165e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 12:51:49 EST 2008