batgrbproduct Analysis for Trigger=323192
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 Sep 1 12:21:43 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger323192/GCN5_download_cron
======================================================================
Trigger: 00323192 Segment: 000
BAT Trigger Time: 241924971.648 [s; MET]
Trigger Stop: 241924971.68 [s; MET]
UTC: 2008-09-01T01:22:48.585240 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 75.2677511936787 Dec: 45.309975494137 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.55
Image Trigger?: NO
Rate S/N Ratio: 13.114877048604 [ if not an image trigger ]
Image S/N Ratio: 6.55
Flight Position: [ source = BAT ]
RA: 75.2677511936787 Dec: 45.309975494137 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 75.2922817736926 Dec: 45.3071761528921 [deg; J2000]
{ 05h 01m 10.1s , +45d 18' 25.8" }
+/- 2.74820869656706 [arcmin] (estimated 90% radius based on SNR)
+/- 1.26088256946552 [arcmin] (formal 1-sigma fit error)
SNR: 7.17636483027139
Angular difference between Flight and Ground position is 1.048662 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 0.0160000026226044 +/- 0.00894426338008669
Measured from: 0.00400009751319885
to: 0.0200001001358032 [s; relative to TRIGTIME]
T50: 0.00400000810623169 +/- 0.00894427670812023
Measured from: 0.00800007581710815
to: 0.0120000839233398 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.483999997377396
to: 0.516000002622604 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00400000810623169
to: 0.0239999890327454 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.004655 0.005653 0.001829 -0.000473
0.000916 0.001059 0.000765 0.000511 [error]
Peak 0.004121 0.006255 0.001630 -0.000458
0.000989 0.001097 0.000797 0.000546 [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 1.39e-09 1.29e-09 8.06e-10 7.74e-10 3.79e-09 4.38e-09 erg/cm2
Error 3.73e-10 3.51e-10 3.95e-10 6.85e-10 1.07e-09 1.43e-09 erg/cm2
Peak flux Power-law 1.92e+00 9.88e-01 3.14e-01 1.28e-01 3.30e+00 3.35e+00 ph/cm2/s
Error 5.47e-01 2.76e-01 1.51e-01 1.06e-01 8.34e-01 8.52e-01 ph/cm2/s
Fluence Cutoff-PL 1.39e-09 1.89e-09 3.18e-10 1.75e-12 3.57e-09 3.56e-09 erg/cm2
Error 4.14e-10 5.90e-10 4.23e-10 8.02e-11 8.71e-10 8.97e-10 erg/cm2
Peak flux Cutoff-PL 1.77e+00 1.63e+00 1.48e-01 2.93e-04 3.55e+00 3.55e+00 ph/cm2/s
Error 5.38e-01 4.48e-01 1.67e-01 6.80e-03 8.29e-01 8.28e-01 ph/cm2/s
Fluence Band 1.40e-09 1.73e-09 4.49e-10 3.50e-11 3.58e-09 3.78e-09 erg/cm2
Error 4.07e-10 5.17e-10 2.23e-10 3.35e-10 1.06e-09 1.28e-09 erg/cm2
Peak flux Band 1.95e+00 1.36e+00 2.47e-01 1.62e-02 3.55e+00 3.44e+00 ph/cm2/s
Error 5.59e-01 3.54e-01 1.30e-01 5.06e-02 8.41e-01 8.59e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.670 0.455 - - 1.80e-02 6.85e-03 51.922 57
CPL -1.175 2.379 26.9 11.5 6.86e+00 0.00e+00 47.079 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.654 0.452 - - 1.52e-02 5.87e-03 57.154 57
CPL -2.437 0.000 28.9 4.5 3.63e+01 8.67e+01 49.279 56
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 0.020 0.004 0.024
T90 0.016 0.004 0.020
T50 0.004 0.008 0.012
Peak 1.000 -0.484 0.516
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
75.2923 +45.3072 0.0269 0.0 -162.7 0.0121 7.2 TRIG_00323192
------------------------------------------
Foreground time interval of the image:
0.004 0.024 (delta_t = 0.020 [sec])
Background time interval of the image:
-60.648 0.004 (delta_t = 60.652 [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 0.004 sec. to 0.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.66979 ( -0.405297 0.505463 )
Norm@50keV : 1.798231E-02 ( -6.889600E-03 6.800683E-03) )
------------------------------------------------------------
Chi-Squared = 51.92205 using 59 PHA bins.
Reduced chi-squared = 0.9109131 for 57 degrees of freedom
Null hypothesis probability = 0.666
Photon flux (15-150 keV) in 2.0000E-02 sec: 3.93428 ( -0.93728 0.93739 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79216e-09 ( -1.0568e-09 1.07982e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.004 sec. to 0.024 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.17466 ( -1.82534 2.93342 )
Epeak [keV] : 26.8831 ( -17.3261 5.72697 )
Norm@50keV : 6.85808 ( )
------------------------------------------------------------
Chi-Squared = 47.07911 using 59 PHA bins.
but latest trial 17.4045 gives Chi-Squared = 1.83411
Reduced chi-squared = 0.8406984 for 56 degrees of freedom
Null hypothesis probability = 0.796
Photon flux (15-150 keV) in 2.0000E-02 sec: 4.10778 ( -0.93854 0.9385 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5729e-09 ( -8.5908e-10 8.8216e-10 ) ergs/cm2
Band function
Time interval is from 0.004 sec. to 0.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50415 ( -8.49585 1.13651 )
beta : -3.74631 ( -6.15715 10.7236 )
Epeak [keV] : 15.5092 ( -17.6683 108.281 )
Norm@50keV : 0.100906 ( -49.3393 1571.94 )
------------------------------------------------------------
Chi-Squared = 49.42813 using 59 PHA bins.
Reduced chi-squared = 0.8986933 for 55 degrees of freedom
Null hypothesis probability = 0.687
Photon flux (15-150 keV) in 2.0000E-02 sec: 4.11102 ( -0.94331 0.94259 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5781e-09 ( -9.0666e-10 1.20744e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.004 sec. to 0.028 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.65416 ( -0.403055 0.500171 )
Norm@50keV : 1.521725E-02 ( -5.884483E-03 5.849071E-03) )
------------------------------------------------------------
Chi-Squared = 57.15368 using 59 PHA bins.
Reduced chi-squared = 1.002696 for 57 degrees of freedom
Null hypothesis probability = 0.469
Photon flux (15-150 keV) in 2.4000E-02 sec: 3.29557 ( -0.83352 0.83366 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82694e-09 ( -1.10736e-09 1.14041e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.004 sec. to 0.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.43699 ( )
Epeak [keV] : 28.8997 ( -4.35273 4.58923 )
Norm@50keV : 36.3046 ( -78.2657 95.0658 )
------------------------------------------------------------
Chi-Squared = 49.27939 using 59 PHA bins.
Reduced chi-squared = 0.8799891 for 56 degrees of freedom
Null hypothesis probability = 0.725
Photon flux (15-150 keV) in 2.4000E-02 sec: 3.54740 ( -0.82728 0.83065 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75002e-09 ( -8.87064e-10 9.56832e-10 ) ergs/cm2
Band function
Time interval is from 0.004 sec. to 0.028 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39133 ( -7.53092 5.10191 )
beta : -4.16279 ( -3.78167 15.5798 )
Epeak [keV] : 17.2594 ( -5.09604 80.7862 )
Norm@50keV : 0.102446 ( -58.2428 1911.41 )
------------------------------------------------------------
Chi-Squared = 53.34365 using 59 PHA bins.
Reduced chi-squared = 0.9698846 for 55 degrees of freedom
Null hypothesis probability = 0.538
Photon flux (15-150 keV) in 2.4000E-02 sec: 3.54918 ( -0.84189 0.84085 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.06534e-09 ( -1.04297e-09 1.10542e-09 ) ergs/cm2
Plot creation:
Mon Sep 1 12:30:31 EDT 2008