batgrbproduct Analysis for Trigger=314975
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): Sun Jun 22 04:38:38 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger314975/GCN5_download_cron
======================================================================
Trigger: 00314975 Segment: 000
BAT Trigger Time: 235756238.208 [s; MET]
Trigger Stop: 235756238.336 [s; MET]
UTC: 2008-06-21T15:50:35.324600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 234.221689916356 Dec: -73.2694142137366 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.63
Image Trigger?: NO
Rate S/N Ratio: 5.8309518948453 [ if not an image trigger ]
Image S/N Ratio: 6.63
Flight Position: [ source = BAT ]
RA: 234.221689916356 Dec: -73.2694142137366 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 234.409795438513 Dec: -73.2763114600664 [deg; J2000]
{ 15h 37m 38.4s , -73d 16' 34.7" }
+/- 3.8172658053709 [arcmin] (estimated 90% radius based on SNR)
+/- 2.24432954349311 [arcmin] (formal 1-sigma fit error)
SNR: 4.48790360323426
Angular difference between Flight and Ground position is 3.274619 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 0.127999991178513 +/-
Measured from: 0
to: 0.127999991178513 [s; relative to TRIGTIME]
T50: 0.127999991178513 +/-
Measured from: 0
to: 0.127999991178513 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.127999991178513 second)
Measured from: 1.49011611938477e-08
to: 0.128000006079674 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.127999991178513 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.000563 0.007981 0.008699 -0.001674
0.001953 0.002033 0.002132 0.001783 [error]
Peak -0.000563 0.007981 0.008699 -0.001674
0.001953 0.002033 0.002132 0.001783 [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 8.66e-10 1.93e-09 3.41e-09 1.41e-08 9.31e-09 1.94e-08 erg/cm2
Error 5.92e-10 9.02e-10 1.57e-09 1.53e-08 4.10e-09 1.43e-08 erg/cm2
Peak flux Power-law 2.16e-01 2.63e-01 2.32e-01 3.52e-01 8.34e-01 1.06e+00 ph/cm2/s
Error 1.50e-01 1.25e-01 1.05e-01 2.98e-01 3.60e-01 4.61e-01 ph/cm2/s
Fluence Cutoff-PL 4.24e-10 2.70e-09 4.72e-09 1.18e-09 8.89e-09 9.02e-09 erg/cm2
Error 3.25e-10 1.17e-09 2.16e-09 2.17e-09 3.53e-09 3.76e-09 erg/cm2
Peak flux Cutoff-PL 1.03e-01 3.54e-01 3.34e-01 4.67e-02 8.33e-01 8.37e-01 ph/cm2/s
Error 7.65e-02 1.58e-01 1.46e-01 7.25e-02 2.96e-01 2.97e-01 ph/cm2/s
Fluence Band 2.78e-10 2.76e-09 4.69e-09 6.83e-10 8.33e-09 1.08e-08 erg/cm2
Error 1.04e-09 1.79e-09 4.51e-09 3.33e-09 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 8.96e-02 3.24e-01 3.65e-01 5.53e-02 7.97e-01 8.18e-01 ph/cm2/s
Error 1.67e-01 1.57e-01 1.37e-01 2.83e-01 2.96e-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 1.173 0.610 - - 7.12e-03 3.01e-03 64.988 57
CPL -2.499 0.000 65.0 16.4 4.10e-01 9.02e-01 58.571 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.173 0.610 - - 7.12e-03 3.01e-03 64.988 57
CPL -2.499 0.000 65.0 16.4 4.10e-01 9.02e-01 58.571 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 0.128 0.000 0.128
T90 0.128 0.000 0.128
T50 0.128 0.000 0.128
Peak 0.128 0.000 0.128
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
234.4098 -73.2763 0.0428 27.6 -20.1 0.0181 4.5 TRIG_00314975
------------------------------------------
Foreground time interval of the image:
0.000 0.128 (delta_t = 0.128 [sec])
Background time interval of the image:
-97.107 -6.208 (delta_t = 90.899 [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 0.000 sec. to 0.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17314 ( -0.612907 0.607807 )
Norm@50keV : 7.123971E-03 ( -3.007601E-03 3.004322E-03) )
------------------------------------------------------------
Chi-Squared = 64.98768 using 59 PHA bins.
Reduced chi-squared = 1.140135 for 57 degrees of freedom
Null hypothesis probability = 0.218
Photon flux (15-150 keV) in 0.1280 sec: 0.834348 ( -0.356331 0.363042 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.31095e-09 ( -4.05249e-09 4.15004e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49868 ( )
Epeak [keV] : 65.0095 ( -14.2466 18.5442 )
Norm@50keV : 0.409534 ( -0.627515 1.17656 )
------------------------------------------------------------
Chi-Squared = 58.57085 using 59 PHA bins.
Reduced chi-squared = 1.045908 for 56 degrees of freedom
Null hypothesis probability = 0.381
Photon flux (15-150 keV) in 0.1280 sec: 0.832570 ( -0.295104 0.29601 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.89056e-09 ( -3.38684e-09 3.68054e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.87416 ( -4.34987 0.178189 )
beta : -8.82035 ( -2.32399 17.6759 )
Epeak [keV] : 69.9675 ( -8.61083 14.6379 )
Norm@50keV : 0.189881 ( -3.47838 11.9584 )
------------------------------------------------------------
Chi-Squared = 59.14785 using 59 PHA bins.
Reduced chi-squared = 1.075415 for 55 degrees of freedom
Null hypothesis probability = 0.327
Photon flux (15-150 keV) in 0.1280 sec: 0.797347 ( -0.276257 0.290353 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.33335e-09 ( -2.93755e-09 3.72538e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17314 ( -0.612907 0.607807 )
Norm@50keV : 7.123971E-03 ( -3.007601E-03 3.004322E-03) )
------------------------------------------------------------
Chi-Squared = 64.98768 using 59 PHA bins.
Reduced chi-squared = 1.140135 for 57 degrees of freedom
Null hypothesis probability = 0.218
Photon flux (15-150 keV) in 0.1280 sec: 0.834348 ( -0.356331 0.363042 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.31095e-09 ( -4.05249e-09 4.15004e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49868 ( )
Epeak [keV] : 65.0095 ( -14.2466 18.5442 )
Norm@50keV : 0.409534 ( -0.627515 1.17656 )
------------------------------------------------------------
Chi-Squared = 58.57085 using 59 PHA bins.
Reduced chi-squared = 1.045908 for 56 degrees of freedom
Null hypothesis probability = 0.381
Photon flux (15-150 keV) in 0.1280 sec: 0.832570 ( -0.295104 0.29601 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.89056e-09 ( -3.38684e-09 3.68054e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.87416 ( -4.34987 0.178189 )
beta : -8.82035 ( -2.32399 5.75762 )
Epeak [keV] : 69.9675 ( -8.61083 14.6379 )
Norm@50keV : 0.189881 ( -3.47838 11.9584 )
------------------------------------------------------------
Chi-Squared = 59.14785 using 59 PHA bins.
Reduced chi-squared = 1.075415 for 55 degrees of freedom
Null hypothesis probability = 0.327
Photon flux (15-150 keV) in 0.1280 sec: 0.797347 ( -0.276257 0.290353 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.33335e-09 ( -2.93755e-09 3.72538e-09 ) ergs/cm2
Plot creation:
Sun Jun 22 05:10:55 EDT 2008