batgrbproduct Analysis for Trigger=359280
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): Thu Aug 6 04:02:00 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger359280/GCN5_download_cron
======================================================================
Trigger: 00359280 Segment: 000
BAT Trigger Time: 271195217.004 [s; MET]
Trigger Stop: 271195217.036 [s; MET]
UTC: 2009-08-05T20:00:12.031500 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 260.642379931199 Dec: -37.4027186275801 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.6
Image Trigger?: NO
Rate S/N Ratio: 6.92820323027551 [ if not an image trigger ]
Image S/N Ratio: 5.6
Flight Position: [ source = BAT ]
RA: 260.642379931199 Dec: -37.4027186275801 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 260.649057132578 Dec: -37.5310735831447 [deg; J2000]
{ 17h 22m 35.8s , -37d 31' 51.9" }
+/- 4.32201995101319 [arcmin] (estimated 90% radius based on SNR)
+/- 2.37780123291714 [arcmin] (formal 1-sigma fit error)
SNR: 3.75832581184454
Angular difference between Flight and Ground position is 7.707859 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0320000052452087 +/-
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
T50: 0.0320000052452087 +/-
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0320000052452087 second)
Measured from: -2.98023223876953e-08
to: 0.0319999754428864 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.000773 0.002160 0.005350 -0.000686
0.001157 0.001220 0.001149 0.001079 [error]
Peak 0.000773 0.002160 0.005350 -0.000686
0.001157 0.001220 0.001149 0.001079 [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 2.56e-10 6.58e-10 1.38e-09 7.44e-09 3.72e-09 9.23e-09 erg/cm2
Error 2.81e-10 4.30e-10 7.77e-10 1.05e-08 2.09e-09 1.16e-08 erg/cm2
Peak flux Power-law 2.54e-01 3.55e-01 3.72e-01 7.20e-01 1.20e+00 1.67e+00 ph/cm2/s
Error 2.83e-01 2.38e-01 2.07e-01 8.34e-01 6.77e-01 1.00e+00 ph/cm2/s
Fluence Cutoff-PL 9.08e-11 7.18e-10 1.87e-09 9.13e-10 3.42e-09 3.57e-09 erg/cm2
Error 1.73e-10 5.04e-10 1.00e-09 3.95e-09 1.88e-09 4.35e-09 erg/cm2
Peak flux Cutoff-PL 8.30e-02 3.61e-01 5.19e-01 1.46e-01 1.09e+00 1.11e+00 ph/cm2/s
Error 1.78e-01 2.68e-01 2.63e-01 3.99e-01 5.65e-01 6.39e-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 0.00e+00 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 0.969 0.893 - - 1.05e-02 5.86e-03 65.460 57
CPL -3.793 0.000 77.8 250.3 6.36e-01 0.00e+00 62.480 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.969 0.893 - - 1.05e-02 5.86e-03 65.460 57
CPL -3.793 0.000 77.8 250.3 6.36e-01 0.00e+00 62.480 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 0.032 0.000 0.032
T90 0.032 0.000 0.032
T50 0.032 0.000 0.032
Peak 0.032 -0.000 0.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
260.6491 -37.5311 0.0512 11.0 -149.8 0.0093 3.8 TRIG_00359280
------------------------------------------
Foreground time interval of the image:
0.000 0.032 (delta_t = 0.032 [sec])
Background time interval of the image:
-60.004 -1.004 (delta_t = 59.000 [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 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.969037 ( -0.924743 0.861539 )
Norm@50keV : 1.05468E-02 ( -0.0059661 0.00576121 )
------------------------------------------------------------
# Chi-Squared = 65.46 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 57 degrees of freedom
# Null hypothesis probability = 2.067060e-01
Photon flux (15-150 keV) in 0.032 sec: 1.20095 ( -0.664519 0.688847 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7159e-09 ( -2.05724e-09 2.11723e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.79310 ( )
Epeak [keV] : 77.8288 ( -25.8435 474.687 )
Norm@50keV : 0.635863 ( )
------------------------------------------------------------
# Chi-Squared = 62.48 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 56 degrees of freedom
# Null hypothesis probability = 2.569499e-01
Photon flux (15-150 keV) in 0.032 sec: 1.08918 ( -0.515402 0.61402 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.41712e-09 ( -1.73636e-09 2.01805e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.78294 ( -5.17908 -4.17443 )
beta : -9.99999 ( 221076 221086 )
Epeak [keV] : 77.2779 ( -25.8091 414.978 )
Norm@50keV : 0.655673 ( -0.655674 1.09312 )
------------------------------------------------------------
# Chi-Squared = 62.48 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 55 degrees of freedom
# Null hypothesis probability = 2.277270e-01
Photon flux (15-150 keV) in 0.032 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 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.969037 ( -0.924743 0.861539 )
Norm@50keV : 1.05468E-02 ( -0.0059661 0.00576121 )
------------------------------------------------------------
# Chi-Squared = 65.46 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 57 degrees of freedom
# Null hypothesis probability = 2.067060e-01
Photon flux (15-150 keV) in 0.032 sec: 1.20095 ( -0.664519 0.688847 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7159e-09 ( -2.05724e-09 2.11723e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.79310 ( )
Epeak [keV] : 77.8288 ( -25.8435 474.687 )
Norm@50keV : 0.635863 ( )
------------------------------------------------------------
# Chi-Squared = 62.48 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 56 degrees of freedom
# Null hypothesis probability = 2.569499e-01
Photon flux (15-150 keV) in 0.032 sec: 1.08918 ( -0.515402 0.61402 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.41712e-09 ( -1.73636e-09 2.01805e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.07642 ( -7.54713 -6.52356 )
beta : -9.99998 ( 167188 167198 )
Epeak [keV] : 76.8069 ( -24.9228 470.091 )
Norm@50keV : 0.814620 ( -0.680739 1.06979 )
------------------------------------------------------------
# Chi-Squared = 62.49 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 55 degrees of freedom
# Null hypothesis probability = 2.276283e-01
Photon flux (15-150 keV) in 0.032 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Aug 6 04:10:59 EDT 2009