batgrbproduct Analysis for Trigger=232683
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 08:26:16 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger232683/GCN5_download_cron
======================================================================
Trigger: 00232683 Segment: 000
BAT Trigger Time: 181908490.304 [s; MET]
Trigger Stop: 181908491.328 [s; MET]
UTC: 2006-10-07T10:08:08.812840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 46.3175910410402 Dec: -50.4878550139145 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.62
Image Trigger?: NO
Rate S/N Ratio: 73.1846978541279 [ if not an image trigger ]
Image S/N Ratio: 15.62
Flight Position: [ source = BAT ]
RA: 46.3175910410402 Dec: -50.4878550139145 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 46.3062555089715 Dec: -50.4938946833105 [deg; J2000]
{ 03h 05m 13.5s , -50d 29' 38.0" }
+/- 0.892051033792976 [arcmin] (estimated 90% radius based on SNR)
+/- 0.254688018085557 [arcmin] (formal 1-sigma fit error)
SNR: 35.8088386233376
RA = 3h 5m 13.5s (46.306256 deg.)
Dec = -50d 29' 38" (-50.493895 deg.)
Angular difference between Flight and Ground position is 0.564402 arcmin
Partial Coding Fraction: 0.1953125 [ including projection effects ]
Duration
T90: 75.3120000064373 +/- 2.03568955863827
Measured from: 3.61599999666214
to: 78.9280000030994 [s; relative to TRIGTIME]
T50: 23.0080000162125 +/- 0.198715898747993
Measured from: 31.4920000135899
to: 54.5000000298023 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 45.1440000236034
to: 46.1440000236034 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.05599999427795
to: 231.752000004053 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 12.450897 20.663214 21.486136 7.371777
0.112773 0.127355 0.127869 0.105017 [error]
Peak 0.303138 0.590656 0.773249 0.301606
0.009659 0.012777 0.015129 0.012484 [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 3.91e-06 9.04e-06 1.66e-05 7.24e-05 4.50e-05 9.92e-05 erg/cm2
Error 1.34e-07 1.81e-07 2.13e-07 2.38e-06 5.66e-07 0.00e+00 erg/cm2
Peak flux Power-law 2.91e+00 4.37e+00 4.90e+00 1.04e+01 1.53e+01 2.26e+01 ph/cm2/s
Error 1.76e-01 1.57e-01 1.24e-01 6.18e-01 3.97e-01 6.36e-01 ph/cm2/s
Fluence Cutoff-PL 3.77e-06 9.03e-06 1.68e-05 6.52e-05 4.49e-05 7.36e-05 erg/cm2
Error 1.86e-07 1.83e-07 2.85e-07 7.33e-06 6.76e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.91e+00 4.37e+00 4.90e+00 1.03e+01 1.53e+01 2.25e+01 ph/cm2/s
Error 1.76e-01 1.57e-01 1.24e-01 6.15e-01 3.97e-01 6.34e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.78e+00 4.37e+00 4.98e+00 9.30e+00 1.52e+01 2.14e+01 ph/cm2/s
Error 2.54e-01 1.59e-01 1.77e-01 1.48e+00 4.15e-01 1.55e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.127 0.026 - - 1.84e-02 2.68e-04 28.932 57
CPL 1.021 0.112 617.8 4830.6 2.02e-02 1.85e-03 26.528 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.835 0.048 - - 1.33e-01 3.51e-03 41.665 57
CPL 0.721 0.182 733.3 5000.0 1.48e-01 2.44e-02 40.373 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: 59.008000 sec.
T50 in the 50-300 keV band: 22.336000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 235.808 -4.056 231.752
T90 75.312 3.616 78.928
T50 23.008 31.492 54.500
Peak 1.000 45.144 46.144
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
46.3063 -50.4939 0.0053 36.1 109.8 8.0132 35.8 TRIG_00232683
------------------------------------------
Foreground time interval of the image:
-4.056 12.397 (delta_t = 16.453 [sec])
Background time interval of the image:
-35.603 -4.056 (delta_t = 31.547 [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 -4.056 sec. to 231.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12711 ( -2.642250E-02 2.629817E-02) )
Norm@50keV : 1.841961E-02 ( -2.689846E-04 2.677198E-04) )
------------------------------------------------------------
Chi-Squared = 28.93249 using 59 PHA bins.
Reduced chi-squared = 0.5075876 for 57 degrees of freedom
Null hypothesis probability = 0.999
Photon flux (15-150 keV) in 235.8 sec: 2.14252 ( -0.03464 0.03477 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50258e-05 ( -5.66392e-07 5.66156e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.056 sec. to 231.752 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02073 ( -0.111880 0.112666 )
Epeak [keV] : 617.794 ( -278.891 9382.21 )
Norm@50keV : 2.015503E-02 ( -1.750834E-03 1.953231E-03) )
------------------------------------------------------------
Chi-Squared = 26.52814 using 59 PHA bins.
but latest trial 1.840368E-02 gives Chi-Squared = 2.85852
Reduced chi-squared = 0.4737168 for 56 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 235.8 sec: 2.14107 ( -0.0346 0.03474 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.49053e-05 ( -5.71343e-07 7.79791e-07 ) ergs/cm2
Band function
Time interval is from -4.056 sec. to 231.752 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.835291 ( -9.16471 2.93116 )
beta : -1.12709 ( -2.631521E-02 2.640975E-02) )
Epeak [keV] : 60.7267 ( -965.946 9033.95 )
Norm@50keV : 3.489946E-02 ( -3.168005E-04 21.9410 )
------------------------------------------------------------
Chi-Squared = 28.93480 using 59 PHA bins.
Reduced chi-squared = 0.5260872 for 55 degrees of freedom
Null hypothesis probability = 0.999
Photon flux (15-150 keV) in 235.8 sec: 2.12271 ( -0.04005 0.04043 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 45.144 sec. to 46.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.834875 ( -4.809499E-02 4.778868E-02) )
Norm@50keV : 0.133370 ( -3.514901E-03 3.501251E-03) )
------------------------------------------------------------
Chi-Squared = 41.66533 using 59 PHA bins.
Reduced chi-squared = 0.7309706 for 57 degrees of freedom
Null hypothesis probability = 0.936
Photon flux (15-150 keV) in 1.000 sec: 15.3137 ( -0.3971 0.3976 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53616e-06 ( -4.0107e-08 4.0167e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 45.144 sec. to 46.144 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.721244 ( -0.222232 0.142575 )
Epeak [keV] : 733.269 ( -733.259 9266.73 )
Norm@50keV : 0.147654 ( -1.713441E-02 3.171600E-02) )
------------------------------------------------------------
Chi-Squared = 40.37268 using 59 PHA bins.
but latest trial 0.135224 gives Chi-Squared = 1.33121
Reduced chi-squared = 0.7209408 for 56 degrees of freedom
Null hypothesis probability = 0.943
Photon flux (15-150 keV) in 1.000 sec: 15.3089 ( -0.3969 0.3975 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53413e-06 ( -4.0678e-08 4.0462e-08 ) ergs/cm2
Band function
Time interval is from 45.144 sec. to 46.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.823868 ( -9.17613 5.82387 )
beta : -0.834875 ( -4.778540E-02 4.810065E-02) )
Epeak [keV] : 17.0484 ( -9999.88 2.050781E-02) )
Norm@50keV : 0.187166 ( -3.824949E-03 3.517568E-03) )
------------------------------------------------------------
Chi-Squared = 41.66534 using 59 PHA bins.
Reduced chi-squared = 0.7575516 for 55 degrees of freedom
Null hypothesis probability = 0.908
Photon flux (15-150 keV) in 1.000 sec: 15.2269 ( -0.4142 0.4161 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53317e-06 ( -4.0684e-08 4.0602e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 08:45:51 EST 2008