batgrbproduct Analysis for Trigger=358924
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 v2.45
Process Start Time (local time): Sat Aug 1 23:48:12 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger358924/GCN5_download_cron
======================================================================
Trigger: 00358924 Segment: 000
BAT Trigger Time: 270804275.264 [s; MET]
Trigger Stop: 270804275.52 [s; MET]
UTC: 2009-08-01T07:24:30.304160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 91.000122897848 Dec: 31.7684120361598 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.66
Image Trigger?: NO
Rate S/N Ratio: 6 [ if not an image trigger ]
Image S/N Ratio: 5.66
Flight Position: [ source = BAT ]
RA: 91.000122897848 Dec: 31.7684120361598 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 91.0643289982925 Dec: 31.6600449845784 [deg; J2000]
{ 06h 04m 15.4s , +31d 39' 36.2" }
+/- 4.6015814179281 [arcmin] (estimated 90% radius based on SNR)
+/- 3.05729799767 [arcmin] (formal 1-sigma fit error)
SNR: 3.43643569880747
Angular difference between Flight and Ground position is 7.281202 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 0.255999982357025 +/-
Measured from: 0
to: 0.255999982357025 [s; relative to TRIGTIME]
T50: 0.255999982357025 +/-
Measured from: 0
to: 0.255999982357025 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.255999982357025 second)
Measured from: -2.98023223876953e-08
to: 0.255999952554703 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.255999982357025 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.003401 0.009961 0.011596 -0.001145
0.002905 0.003032 0.002588 0.002172 [error]
Peak -0.003401 0.009961 0.011596 -0.001145
0.002905 0.003032 0.002588 0.002172 [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 9.12e-10 2.22e-09 4.33e-09 2.09e-08 1.17e-08 2.85e-08 erg/cm2
Error 6.92e-10 1.22e-09 2.08e-09 2.14e-08 5.58e-09 1.92e-08 erg/cm2
Peak flux Power-law 1.13e-01 1.50e-01 1.47e-01 2.56e-01 4.94e-01 6.67e-01 ph/cm2/s
Error 8.87e-02 8.41e-02 6.97e-02 2.48e-01 2.45e-01 3.19e-01 ph/cm2/s
Fluence Cutoff-PL 4.85e-10 3.46e-09 7.61e-09 2.82e-09 1.39e-08 1.42e-08 erg/cm2
Error 3.23e-10 1.51e-09 2.75e-09 3.32e-09 4.95e-09 5.42e-09 erg/cm2
Peak flux Cutoff-PL 5.52e-02 2.19e-01 2.68e-01 5.73e-02 5.92e-01 5.99e-01 ph/cm2/s
Error 3.90e-02 9.96e-02 9.29e-02 5.29e-02 2.03e-01 2.04e-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 5.99e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.065 0.595 - - 4.33e-03 2.06e-03 68.830 57
CPL -4.968 0.000 69.8 12.7 1.44e+00 8.37e-01 54.880 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.065 0.595 - - 4.33e-03 2.06e-03 68.830 57
CPL -4.968 0.000 69.8 12.7 1.44e+00 8.37e-01 54.880 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 0.256 0.000 0.256
T90 0.256 0.000 0.256
T50 0.256 0.000 0.256
Peak 0.256 -0.000 0.256
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
91.0643 +31.6600 0.0561 20.9 -146.3 0.0174 3.4 TRIG_00358924
------------------------------------------
Foreground time interval of the image:
0.000 0.256 (delta_t = 0.256 [sec])
Background time interval of the image:
-60.264 -3.264 (delta_t = 57.000 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06455 ( -0.599586 0.591158 )
Norm@50keV : 4.32902E-03 ( -0.00213109 0.00198724 )
------------------------------------------------------------
# Chi-Squared = 68.83 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 57 degrees of freedom
# Null hypothesis probability = 1.355507e-01
Photon flux (15-150 keV) in 0.256 sec: 0.494116 ( -0.240987 0.249502 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17122e-08 ( -5.57591e-09 5.59009e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.96811 ( )
Epeak [keV] : 69.8063 ( -11.6459 13.7519 )
Norm@50keV : 1.44282 ( -0.873175 0.800871 )
------------------------------------------------------------
# Chi-Squared = 54.88 using 59 PHA bins.
# Reduced chi-squared = 0.9799 for 56 degrees of freedom
# Null hypothesis probability = 5.174842e-01
Photon flux (15-150 keV) in 0.256 sec: 0.592317 ( -0.202354 0.204283 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39291e-08 ( -4.831e-09 5.07095e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99961 ( -4883.65 -4868.66 )
beta : -9.37167 ( 10 19.999 )
Epeak [keV] : 69.9602 ( -11.7816 13.5749 )
Norm@50keV : 1.45584 ( -1.02576 3.09198 )
------------------------------------------------------------
# Chi-Squared = 54.87 using 59 PHA bins.
# Reduced chi-squared = 0.9976 for 55 degrees of freedom
# Null hypothesis probability = 4.797485e-01
Photon flux (15-150 keV) in 0.256 sec: ( ) 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 0.000 sec. to 0.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06455 ( -0.599586 0.591158 )
Norm@50keV : 4.32902E-03 ( -0.00213109 0.00198724 )
------------------------------------------------------------
# Chi-Squared = 68.83 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 57 degrees of freedom
# Null hypothesis probability = 1.355507e-01
Photon flux (15-150 keV) in 0.256 sec: 0.494116 ( -0.240987 0.249502 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17122e-08 ( -5.57591e-09 5.59009e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.96811 ( )
Epeak [keV] : 69.8063 ( -11.6459 13.7519 )
Norm@50keV : 1.44282 ( -0.873175 0.800871 )
------------------------------------------------------------
# Chi-Squared = 54.88 using 59 PHA bins.
# Reduced chi-squared = 0.9799 for 56 degrees of freedom
# Null hypothesis probability = 5.174842e-01
Photon flux (15-150 keV) in 0.256 sec: 0.592317 ( -0.202354 0.204283 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39291e-08 ( -4.831e-09 5.07095e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99961 ( -4883.65 -4868.66 )
beta : -9.37167 ( 10 19.999 )
Epeak [keV] : 69.9602 ( -11.7816 13.5749 )
Norm@50keV : 1.45584 ( -1.02549 3.09199 )
------------------------------------------------------------
# Chi-Squared = 54.87 using 59 PHA bins.
# Reduced chi-squared = 0.9976 for 55 degrees of freedom
# Null hypothesis probability = 4.797485e-01
Photon flux (15-150 keV) in 0.256 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Aug 1 23:55:38 EDT 2009