batgrbproduct Analysis for Trigger=355128
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): Fri Jun 19 05:42:42 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger355128/GCN5_download_cron
======================================================================
Trigger: 00355128 Segment: 000
BAT Trigger Time: 267034616.128 [s; MET]
Trigger Stop: 267034632.512 [s; MET]
UTC: 2009-06-18T16:16:51.290280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 81.0368078772837 Dec: -22.5481759863078 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.85
Image Trigger?: NO
Rate S/N Ratio: 58.7281874401041 [ if not an image trigger ]
Image S/N Ratio: 5.85
Flight Position: [ source = BAT ]
RA: 81.0368078772837 Dec: -22.5481759863078 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 81.062209003057 Dec: -22.5409294311586 [deg; J2000]
{ 05h 24m 14.9s , -22d 32' 27.3" }
+/- 3.81494976259335 [arcmin] (estimated 90% radius based on SNR)
+/- 2.05787220575684 [arcmin] (formal 1-sigma fit error)
SNR: 4.49179638198912
Angular difference between Flight and Ground position is 1.473223 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 16.3840000033379 +/-
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
T50: 16.3840000033379 +/-
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 16.3840000033379 second)
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.014149 0.081548 0.084346 0.007799
0.023949 0.024873 0.026093 0.031068 [error]
Peak 0.014149 0.081548 0.084346 0.007799
0.023949 0.024873 0.026093 0.031068 [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 1.07e-08 2.72e-08 5.53e-08 2.83e-07 2.74e-07 1.48e-07 erg/cm2
Error 7.63e-09 1.19e-08 2.46e-08 6.49e-08 3.29e-07 0.00e+00 erg/cm2
Peak flux Power-law 2.09e-02 2.87e-02 2.92e-02 5.38e-02 9.60e-02 1.33e-01 ph/cm2/s
Error 1.51e-02 1.29e-02 1.26e-02 5.41e-02 3.66e-02 4.78e-02 ph/cm2/s
Fluence Cutoff-PL 8.79e-09 2.96e-08 5.87e-08 7.76e-08 1.36e-07 1.75e-07 erg/cm2
Error 9.22e-09 1.47e-08 3.02e-08 3.29e-07 7.11e-08 3.77e-07 erg/cm2
Peak flux Cutoff-PL 1.69e-02 3.08e-02 3.14e-02 1.97e-02 9.13e-02 9.88e-02 ph/cm2/s
Error 1.81e-02 1.56e-02 1.52e-02 5.83e-02 3.80e-02 6.97e-02 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 1.81e-02 3.01e-02 1.15e-01 1.06e-01 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 0.977 0.701 - - 8.35e-04 3.16e-04 49.880 57
CPL -0.033 2.282 105.1 0.0 2.55e-03 1.76e-01 49.430 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.977 0.701 - - 8.35e-04 3.16e-04 49.880 57
CPL -0.033 2.282 105.1 0.0 2.55e-03 1.76e-01 49.430 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 16.384 0.000 16.384
T90 16.384 0.000 16.384
T50 16.384 0.000 16.384
Peak 16.384 0.000 16.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
81.0622 -22.5409 0.0428 23.8 -166.5 0.3277 4.5 TRIG_00355128
------------------------------------------
Foreground time interval of the image:
0.000 16.384 (delta_t = 16.384 [sec])
Background time interval of the image:
-60.128 -53.882 (delta_t = 6.246 [sec])
-53.128 -40.128 (delta_t = 13.000 [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 16.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.977250 ( -0.730844 0.670711 )
Norm@50keV : 8.34821E-04 ( -0.000316388 0.000315771 )
------------------------------------------------------------
# Chi-Squared = 49.88 using 59 PHA bins.
# Reduced chi-squared = 0.8750 for 57 degrees of freedom
# Null hypothesis probability = 7.369232e-01
Photon flux (15-150 keV) in 16.38 sec: 9.60151E-02 ( -0.0365071 0.0365977 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47936e-07 ( -6.18648e-08 6.78895e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.33256E-02 ( -4.5311 0.0327526 )
Epeak [keV] : 105.052 ( -105.114 -105.114 )
Norm@50keV : 2.55256E-03 ( -0.0025483 0.350279 )
------------------------------------------------------------
# Chi-Squared = 49.43 using 59 PHA bins.
# Reduced chi-squared = 0.8827 for 56 degrees of freedom
# Null hypothesis probability = 7.200097e-01
Photon flux (15-150 keV) in 16.38 sec: 9.12951E-02 ( -0.0376804 0.0382299 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35791e-07 ( -6.77418e-08 7.44252e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.95194E-03 ( -7.87641 4.49215 )
beta : -10.00000 ( 1.25479e+11 1.25479e+11 )
Epeak [keV] : 107.101 ( -58.9729 -106.461 )
Norm@50keV : 2.45812E-03 ( -0.00249671 0.329444 )
------------------------------------------------------------
# Chi-Squared = 49.43 using 59 PHA bins.
# Reduced chi-squared = 0.8988 for 55 degrees of freedom
# Null hypothesis probability = 6.863762e-01
Photon flux (15-150 keV) in 16.38 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 16.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.977250 ( -0.730844 0.670711 )
Norm@50keV : 8.34821E-04 ( -0.000316388 0.000315771 )
------------------------------------------------------------
# Chi-Squared = 49.88 using 59 PHA bins.
# Reduced chi-squared = 0.8750 for 57 degrees of freedom
# Null hypothesis probability = 7.369232e-01
Photon flux (15-150 keV) in 16.38 sec: 9.60151E-02 ( -0.0365071 0.0365977 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47936e-07 ( -6.18648e-08 6.78895e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.33256E-02 ( -4.5311 0.0327526 )
Epeak [keV] : 105.052 ( -105.114 -105.114 )
Norm@50keV : 2.55256E-03 ( -0.0025483 0.350279 )
------------------------------------------------------------
# Chi-Squared = 49.43 using 59 PHA bins.
# Reduced chi-squared = 0.8827 for 56 degrees of freedom
# Null hypothesis probability = 7.200097e-01
Photon flux (15-150 keV) in 16.38 sec: 9.12951E-02 ( -0.0376804 0.0382299 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35791e-07 ( -6.77418e-08 7.44252e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.95194E-03 ( -7.87641 4.49215 )
beta : -10.00000 ( 1.25479e+11 1.25479e+11 )
Epeak [keV] : 107.101 ( -58.9729 -106.461 )
Norm@50keV : 2.45812E-03 ( -0.00249671 0.329547 )
------------------------------------------------------------
# Chi-Squared = 49.43 using 59 PHA bins.
# Reduced chi-squared = 0.8988 for 55 degrees of freedom
# Null hypothesis probability = 6.863762e-01
Photon flux (15-150 keV) in 16.38 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Jun 19 05:56:04 EDT 2009