batgrbproduct Analysis for Trigger=319036
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): Tue Aug 5 14:05:46 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger319036/GCN5_download_cron
======================================================================
Trigger: 00319036 Segment: 000
BAT Trigger Time: 239614897.728 [s; MET]
Trigger Stop: 239614898.752 [s; MET]
UTC: 2008-08-05T07:41:34.733120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 314.231247555151 Dec: -62.4380396223226 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.81
Image Trigger?: NO
Rate S/N Ratio: 27.1845544381364 [ if not an image trigger ]
Image S/N Ratio: 8.81
Flight Position: [ source = BAT ]
RA: 314.231247555151 Dec: -62.4380396223226 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 314.227179063433 Dec: -62.4353599295385 [deg; J2000]
{ 20h 56m 54.5s , -62d 26' 07.3" }
+/- 0.858234393425319 [arcmin] (estimated 90% radius based on SNR)
+/- 0.299979404042519 [arcmin] (formal 1-sigma fit error)
SNR: 37.841389353301
Angular difference between Flight and Ground position is 0.196494 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 106.304000020027 +/- 18.0569906873012
Measured from: -0.687999993562698
to: 105.616000026464 [s; relative to TRIGTIME]
T50: 38.2080000042915 +/- 5.61050444150932
Measured from: 7.3120000064373
to: 45.5200000107288 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.30000001192093
to: 3.30000001192093 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.95199999213219
to: 136.272000014782 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.362948 1.567146 1.205029 0.278928
0.057761 0.058382 0.051901 0.044514 [error]
Peak 0.012691 0.047173 0.059741 0.021163
0.004865 0.005360 0.005274 0.004159 [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 3.65e-07 6.44e-07 8.68e-07 2.41e-06 2.52e-06 4.29e-06 erg/cm2
Error 2.93e-08 2.95e-08 5.20e-08 3.24e-07 1.22e-07 3.59e-07 erg/cm2
Peak flux Power-law 1.81e-01 2.90e-01 3.50e-01 8.28e-01 1.06e+00 1.65e+00 ph/cm2/s
Error 4.57e-02 4.51e-02 4.01e-02 2.06e-01 1.22e-01 2.19e-01 ph/cm2/s
Fluence Cutoff-PL 3.65e-07 6.44e-07 8.69e-07 2.39e-06 2.52e-06 4.27e-06 erg/cm2
Error 2.94e-08 2.96e-08 5.21e-08 3.22e-07 1.22e-07 3.32e-07 erg/cm2
Peak flux Cutoff-PL 1.34e-01 2.99e-01 3.94e-01 3.62e-01 1.02e+00 1.19e+00 ph/cm2/s
Error 5.81e-02 5.11e-02 5.63e-02 2.87e-01 1.27e-01 3.12e-01 ph/cm2/s
Fluence Band 3.60e-07 6.41e-07 8.69e-07 2.42e-06 2.52e-06 4.31e-06 erg/cm2
Error 1.90e-08 2.78e-08 4.38e-08 2.65e-07 1.15e-07 2.64e-07 erg/cm2
Peak flux Band 1.35e-01 3.00e-01 3.94e-01 3.61e-01 1.02e+00 1.19e+00 ph/cm2/s
Error 5.80e-02 5.11e-02 5.63e-02 2.82e-01 1.27e-01 3.12e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.568 0.085 - - 1.91e-03 8.47e-05 60.525 57
CPL 1.533 0.125 670.1 0.0 1.98e-03 8.52e-05 60.730 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.728 0.196 - - 9.19e-03 1.10e-03 58.764 57
CPL -0.286 1.063 135.3 319.5 2.46e-02 3.15e-02 55.228 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: 31.552000 sec.
T50 in the 50-300 keV band: 13.760000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 140.224 -3.952 136.272
T90 106.304 -0.688 105.616
T50 38.208 7.312 45.520
Peak 1.000 2.300 3.300
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
314.2272 -62.4354 0.0050 12.0 -34.9 1.7026 37.8 TRIG_00319036
------------------------------------------
Foreground time interval of the image:
-3.952 13.173 (delta_t = 17.125 [sec])
Background time interval of the image:
-239.728 -3.952 (delta_t = 235.776 [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 -3.952 sec. to 136.272 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56777 ( -8.420241E-02 8.485603E-02) )
Norm@50keV : 1.913572E-03 ( -8.487923E-05 8.443906E-05) )
------------------------------------------------------------
Chi-Squared = 60.52514 using 59 PHA bins.
Reduced chi-squared = 1.061845 for 57 degrees of freedom
Null hypothesis probability = 0.350
Photon flux (15-150 keV) in 140.2 sec: 0.243511 ( -0.010933 0.01097 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5191e-06 ( -1.21133e-07 1.22717e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.952 sec. to 136.272 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53305 ( -0.129177 0.120926 )
Epeak [keV] : 670.086 ( )
Norm@50keV : 1.978205E-03 ( -8.844724E-05 8.190039E-05) )
------------------------------------------------------------
Chi-Squared = 60.73004 using 59 PHA bins.
but latest trial 1.28079 gives Chi-Squared = 12.1245
Reduced chi-squared = 1.084465 for 56 degrees of freedom
Null hypothesis probability = 0.309
Photon flux (15-150 keV) in 140.2 sec: 0.243393 ( -0.010928 0.010964 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51962e-06 ( -1.21722e-07 1.22226e-07 ) ergs/cm2
Band function
Time interval is from -3.952 sec. to 136.272 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17183 ( -0.492470 11.9218 )
beta : -1.57015 ( -8.485854E-02 8.421874E-02) )
Epeak [keV] : 49.1501 ( -49.0501 9950.85 )
Norm@50keV : 3.846908E-03 ( -1.152155E-02 1.148552E-02) )
------------------------------------------------------------
Chi-Squared = 60.53873 using 59 PHA bins.
Reduced chi-squared = 1.100704 for 55 degrees of freedom
Null hypothesis probability = 0.283
Photon flux (15-150 keV) in 140.2 sec: 0.243349 ( -0.010716 0.010434 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52032e-06 ( -1.21988e-07 1.07786e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.320 sec. to 3.280 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.728003 ( -0.200711 0.190545 )
Norm@50keV : 9.186978E-03 ( -1.105790E-03 1.091014E-03) )
------------------------------------------------------------
Chi-Squared = 58.76357 using 59 PHA bins.
Reduced chi-squared = 1.030940 for 57 degrees of freedom
Null hypothesis probability = 0.411
Photon flux (15-150 keV) in 0.9600 sec: 1.05977 ( -0.122088 0.12242 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06332e-07 ( -1.26777e-08 1.27229e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.320 sec. to 3.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.285940 ( -1.20363 0.922281 )
Epeak [keV] : 135.340 ( -42.6990 596.327 )
Norm@50keV : 2.457887E-02 ( -1.438431E-02 4.852341E-02) )
------------------------------------------------------------
Chi-Squared = 55.22818 using 59 PHA bins.
Reduced chi-squared = 0.9862174 for 56 degrees of freedom
Null hypothesis probability = 0.504
Photon flux (15-150 keV) in 0.9600 sec: 1.02445 ( -0.127577 0.127 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02058e-07 ( -1.41341e-08 1.37069e-08 ) ergs/cm2
Band function
Time interval is from 2.320 sec. to 3.280 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11861 ( -8.88139 6.11861 )
beta : -0.727995 ( -0.190527 0.200786 )
Epeak [keV] : 16.5188 ( -16.4188 9983.48 )
Norm@50keV : 1.194010E-02 ( -4.44169 7.55823 )
------------------------------------------------------------
Chi-Squared = 58.76358 using 59 PHA bins.
Reduced chi-squared = 1.068429 for 55 degrees of freedom
Null hypothesis probability = 0.339
Photon flux (15-150 keV) in 0.9600 sec: 1.02433 ( -0.127458 0.12732 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0194e-07 ( -1.40455e-08 1.37664e-08 ) ergs/cm2
Plot creation:
Tue Aug 5 14:29:55 EDT 2008