batgrbproduct Analysis for Trigger=350854
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 v2.44
Process Start Time (local time): Wed Apr 29 13:53:25 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger350854/GCN5_download_cron
======================================================================
Trigger: 00350854 Segment: 000
BAT Trigger Time: 262675808.064 [s; MET]
Trigger Stop: 262675809.088 [s; MET]
UTC: 2009-04-29T05:30:03.365540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 210.703996637861 Dec: 32.1634408652192 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.91
Image Trigger?: NO
Rate S/N Ratio: 24.6981780704569 [ if not an image trigger ]
Image S/N Ratio: 12.91
Flight Position: [ source = BAT ]
RA: 210.703996637861 Dec: 32.1634408652192 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 210.673076671479 Dec: 32.1721818297024 [deg; J2000]
{ 14h 02m 41.5s , +32d 10' 19.9" }
+/- 1.2326757546091 [arcmin] (estimated 90% radius based on SNR)
+/- 0.411925057678371 [arcmin] (formal 1-sigma fit error)
SNR: 22.5597510528766
Angular difference between Flight and Ground position is 1.655671 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 5.58399999141693 +/- 1.01801767977434
Measured from: -3.67599990963936
to: 1.90800008177757 [s; relative to TRIGTIME]
T50: 2.45600000023842 +/- 0.275187191840214
Measured from: -1.90399992465973
to: 0.55200007557869 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.280000001192093
to: 0.719999998807907 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.46000000834465
to: 2.47999998927116 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.213942 0.295293 0.123297 -0.006867
0.015809 0.016275 0.014022 0.011940 [error]
Peak 0.057539 0.084995 0.042424 0.008665
0.006364 0.006729 0.005729 0.004800 [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 7.62e-08 1.06e-07 1.09e-07 2.04e-07 3.56e-07 4.94e-07 erg/cm2
Error 7.83e-09 7.67e-09 1.30e-08 4.79e-08 3.04e-08 6.23e-08 erg/cm2
Peak flux Power-law 6.20e-01 5.35e-01 3.15e-01 2.79e-01 1.59e+00 1.75e+00 ph/cm2/s
Error 9.02e-02 5.34e-02 4.60e-02 7.72e-02 1.59e-01 1.78e-01 ph/cm2/s
Fluence Cutoff-PL 6.69e-08 1.24e-07 9.85e-08 2.66e-08 3.11e-07 3.16e-07 erg/cm2
Error 9.12e-09 1.13e-08 1.74e-08 2.56e-08 3.30e-08 4.13e-08 erg/cm2
Peak flux Cutoff-PL 5.43e-01 6.24e-01 3.13e-01 6.17e-02 1.53e+00 1.54e+00 ph/cm2/s
Error 1.02e-01 7.76e-02 5.77e-02 6.27e-02 1.62e-01 1.70e-01 ph/cm2/s
Fluence Band 6.55e-08 1.25e-07 9.52e-08 7.61e-08 3.21e-07 3.63e-07 erg/cm2
Error 7.21e-09 9.43e-09 1.34e-08 6.27e-08 3.45e-08 7.31e-08 erg/cm2
Peak flux Band 5.43e-01 6.37e-01 2.98e-01 1.48e-01 1.56e+00 1.63e+00 ph/cm2/s
Error 1.05e-01 6.99e-02 3.50e-02 1.34e-01 1.63e-01 1.93e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.961 0.131 - - 5.57e-03 4.90e-04 46.936 57
CPL 0.477 0.773 42.0 5.6 4.03e-02 5.50e-02 31.391 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.762 0.167 - - 1.17e-02 1.33e-03 70.645 57
CPL 0.419 0.918 49.9 12.6 6.86e-02 1.33e-01 61.993 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: 2.752000 sec.
T50 in the 50-300 keV band: 1.856000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 6.940 -4.460 2.480
T90 5.584 -3.676 1.908
T50 2.456 -1.904 0.552
Peak 1.000 -0.280 0.720
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
210.6731 +32.1722 0.0086 24.5 14.5 0.6573 22.6 TRIG_00350854
------------------------------------------
Foreground time interval of the image:
-4.460 2.480 (delta_t = 6.940 [sec])
Background time interval of the image:
-239.064 -222.644 (delta_t = 16.420 [sec])
-222.064 -56.683 (delta_t = 165.381 [sec])
-55.064 -4.460 (delta_t = 50.604 [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 -4.460 sec. to 2.480 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96085 ( -0.128307 0.132766 )
Norm@50keV : 5.568924E-03 ( -4.935726E-04 4.869043E-04) )
------------------------------------------------------------
Chi-Squared = 46.93567 using 59 PHA bins.
Reduced chi-squared = 0.8234328 for 57 degrees of freedom
Null hypothesis probability = 0.827
Photon flux (15-150 keV) in 6.940 sec: 0.820650 ( -0.059648 0.059667 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.55761e-07 ( -3.01862e-08 3.06588e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.460 sec. to 2.480 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.477079 ( -0.843025 0.702960 )
Epeak [keV] : 41.9868 ( -4.94978 6.24186 )
Norm@50keV : 4.033134E-02 ( -2.442122E-02 8.552539E-02) )
------------------------------------------------------------
Chi-Squared = 31.39089 using 59 PHA bins.
Reduced chi-squared = 0.5605516 for 56 degrees of freedom
Null hypothesis probability = 0.997
Photon flux (15-150 keV) in 6.940 sec: 0.776787 ( -0.062231 0.062429 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10934e-07 ( -3.17373e-08 3.42413e-08 ) ergs/cm2
Band function
Time interval is from -4.460 sec. to 2.480 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.448858 ( -0.730887 0.788832 )
beta : -8.82259 ( )
Epeak [keV] : 41.9364 ( )
Norm@50keV : 4.187450E-02 ( )
------------------------------------------------------------
Chi-Squared = 31.39411 using 59 PHA bins.
Reduced chi-squared = 0.5708019 for 55 degrees of freedom
Null hypothesis probability = 0.996
Photon flux (15-150 keV) in 6.940 sec: 0.781083 ( -0.031045 0.05932 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.21205e-07 ( -3.50345e-08 3.39852e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.280 sec. to 0.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76154 ( -0.164402 0.170066 )
Norm@50keV : 1.171247E-02 ( -1.336867E-03 1.319453E-03) )
------------------------------------------------------------
Chi-Squared = 70.64503 using 59 PHA bins.
Reduced chi-squared = 1.239387 for 57 degrees of freedom
Null hypothesis probability = 0.106
Photon flux (15-150 keV) in 1.000 sec: 1.59051 ( -0.15876 0.15879 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08094e-07 ( -1.26961e-08 1.2722e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.280 sec. to 0.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.418922 ( -1.01427 0.822538 )
Epeak [keV] : 49.9406 ( -7.99983 17.2622 )
Norm@50keV : 6.860834E-02 ( -6.860834E-02 0.196864 )
------------------------------------------------------------
Chi-Squared = 61.99269 using 59 PHA bins.
Reduced chi-squared = 1.107012 for 56 degrees of freedom
Null hypothesis probability = 0.271
Photon flux (15-150 keV) in 1.000 sec: 1.53140 ( -0.16132 0.16186 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.58356e-08 ( -1.32074e-08 1.41964e-08 ) ergs/cm2
Band function
Time interval is from -0.280 sec. to 0.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.391190 ( -0.850149 0.806306 )
beta : -9.18162 ( )
Epeak [keV] : 49.7381 ( )
Norm@50keV : 7.113224E-02 ( )
------------------------------------------------------------
Chi-Squared = 61.99474 using 59 PHA bins.
Reduced chi-squared = 1.127177 for 55 degrees of freedom
Null hypothesis probability = 0.241
Photon flux (15-150 keV) in 1.000 sec: 1.55620 ( -0.16363 0.16137 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00779e-07 ( -1.4416e-08 1.3293e-08 ) ergs/cm2
Plot creation:
Wed Apr 29 14:49:44 EDT 2009