batgrbproduct Analysis for Trigger=351466
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): Fri May 8 13:45:21 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger351466/GCN5_download_cron
======================================================================
Trigger: 00351466 Segment: 000
BAT Trigger Time: 263475083.136 [s; MET]
Trigger Stop: 263475084.16 [s; MET]
UTC: 2009-05-08T11:31:18.412180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 354.9879027526 Dec: 19.1831026767526 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.62
Image Trigger?: NO
Rate S/N Ratio: 17.1172427686237 [ if not an image trigger ]
Image S/N Ratio: 5.62
Flight Position: [ source = BAT ]
RA: 354.9879027526 Dec: 19.1831026767526 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 354.993179343868 Dec: 19.1704539991485 [deg; J2000]
{ 23h 39m 58.4s , +19d 10' 13.6" }
+/- 3.43681037721168 [arcmin] (estimated 90% radius based on SNR)
+/- 1.95336771187762 [arcmin] (formal 1-sigma fit error)
SNR: 5.21412994080162
Angular difference between Flight and Ground position is 0.815707 arcmin
Partial Coding Fraction: 0.6953125 [ including projection effects ]
Duration
T90: 0.0640000104904175 +/- 0.0233238139579815
Measured from: 21.6120000779629
to: 21.6760000884533 [s; relative to TRIGTIME]
T50: 0.0320000052452087 +/- 0.0233238139579815
Measured from: 21.6320000886917
to: 21.6640000939369 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 21.1480000019073
to: 22.1480000019073 [s; relative to TRIGTIME]
Total Fluence
Measured from: 21.6079999804497
to: 21.6839999854565 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.005268 0.005006 0.008385 0.009810
0.002144 0.002503 0.002472 0.002874 [error]
Peak 0.004952 0.004756 0.008722 0.009557
0.002209 0.002586 0.002509 0.002925 [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 2.00e-09 2.85e-09 3.01e-09 5.87e-09 9.69e-09 1.51e-08 erg/cm2
Error 9.65e-10 1.09e-09 2.35e-09 6.72e-09 4.26e-09 8.49e-09 erg/cm2
Peak flux Power-law 7.99e-01 6.30e-01 3.35e-01 2.59e-01 1.88e+00 2.02e+00 ph/cm2/s
Error 4.00e-01 2.47e-01 1.89e-01 2.79e-01 7.38e-01 8.02e-01 ph/cm2/s
Fluence Cutoff-PL 1.29e-09 3.57e-09 4.87e-09 2.41e-09 1.13e-08 1.22e-08 erg/cm2
Error 1.13e-09 1.37e-09 3.16e-09 4.62e-09 4.65e-09 5.91e-09 erg/cm2
Peak flux Cutoff-PL 4.26e-01 7.72e-01 5.69e-01 1.29e-01 1.87e+00 1.90e+00 ph/cm2/s
Error 4.58e-01 3.47e-01 4.65e-01 1.86e-01 7.70e-01 7.64e-01 ph/cm2/s
Fluence Band 1.31e-09 3.54e-09 4.73e-09 2.51e-09 1.13e-08 1.21e-08 erg/cm2
Error 1.14e-09 1.36e-09 3.19e-09 1.71e-09 4.64e-09 5.90e-09 erg/cm2
Peak flux Band 4.39e-01 7.76e-01 5.62e-01 1.28e-01 1.88e+00 1.90e+00 ph/cm2/s
Error 5.61e-01 2.80e-01 4.20e-01 1.81e-01 6.88e-01 7.14e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.921 0.643 - - 1.39e-02 6.36e-03 51.915 57
CPL -0.237 2.615 65.3 5000.0 1.23e-01 8.80e-01 49.865 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.913 0.638 - - 1.30e-02 6.05e-03 52.260 57
CPL -0.519 2.534 64.6 5000.0 1.54e-01 9.09e-01 49.738 0
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 0.076 21.608 21.684
T90 0.064 21.612 21.676
T50 0.032 21.632 21.664
Peak 1.000 21.148 22.148
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
Foreground time interval of the image:
21.608 21.684 (delta_t = 0.076 [sec])
Background time interval of the image:
-60.136 21.608 (delta_t = 81.744 [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 21.608 sec. to 21.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92135 ( -0.510978 0.774715 )
Norm@50keV : 1.387304E-02 ( -6.707937E-03 6.016922E-03) )
------------------------------------------------------------
Chi-Squared = 51.91511 using 59 PHA bins.
Reduced chi-squared = 0.9107913 for 57 degrees of freedom
Null hypothesis probability = 0.666
Photon flux (15-150 keV) in 7.6000E-02 sec: 2.00922 ( -0.76099 0.76105 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.69441e-09 ( -4.24548e-09 4.27781e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.608 sec. to 21.684 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.236996 ( -2.76300 2.46605 )
Epeak [keV] : 65.2908 ( -65.2808 9934.71 )
Norm@50keV : 0.122501 ( -0.122501 1.63673 )
------------------------------------------------------------
Chi-Squared = 49.86460 using 59 PHA bins.
but latest trial 1.75923 gives Chi-Squared = 3.42623
Reduced chi-squared = 0.8904392 for 56 degrees of freedom
Null hypothesis probability = 0.705
Photon flux (15-150 keV) in 7.6000E-02 sec: 1.98729 ( -0.8197 0.79005 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13228e-08 ( -4.57956e-09 4.71116e-09 ) ergs/cm2
Band function
Time interval is from 21.608 sec. to 21.684 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.222122 ( -10.2221 4.77788 )
beta : -9.33577 ( -0.664233 19.3357 )
Epeak [keV] : 66.0550 ( -12.6308 9933.95 )
Norm@50keV : 0.119595 ( -0.119595 4.05318 )
------------------------------------------------------------
Chi-Squared = 49.86257 using 59 PHA bins.
Reduced chi-squared = 0.9065922 for 55 degrees of freedom
Null hypothesis probability = 0.671
Photon flux (15-150 keV) in 7.6000E-02 sec: 1.99456 ( -0.80147 0.78287 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13036e-08 ( -4.54992e-09 4.73814e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.0554 -5.1199 5.9094
R^2/D10^2 : 0.172668 -0.116286 0.389508
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 49.86664 using 59 PHA bins.
Reduced chi-squared = 0.8748533 for 57 degrees of freedom
Null hypothesis probability = 0.737
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.767e-10 4.236e-10
25- 50 3.446e-09 1.767e-09
50-150 7.164e-09 4.296e-09
15-150 1.139e-08 6.129e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9958 -61.0905 100.004
Norm : 9.33521 -3.73785 4.98479
------------------------------------------------------------
Chi-Squared = 50.83349 using 59 PHA bins.
Reduced chi-squared = 0.8918157 for 57 degrees of freedom
Null hypothesis probability = 0.704
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.854e-09 8.461e-10
25- 50 3.206e-09 1.456e-09
50-150 5.196e-09 2.371e-09
15-150 1.026e-08 4.729e-09
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.31177 -1.27433 3.11534
R1^2/D10^2 : 518.170 -509.679 20978.7
kT2 [keV] : 18.6324 -5.3619 6.8015
R2^2/D10^2 : 0.116698 -0.058349 0.15978
------------------------------------------------------------
Chi-Squared = 46.01770 using 59 PHA bins.
but latest trial 1.05558 gives Chi-Squared = 3.84539
but latest trial 1.884893E-02 gives Chi-Squared = 5.01283
but latest trial 0.276478 gives Chi-Squared = 5.18269
Reduced chi-squared = 0.8366854 for 55 degrees of freedom
Null hypothesis probability = 0.801
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.809e-09 9.124e-10
25- 50 2.954e-09 1.589e-09
50-150 7.345e-09 4.996e-09
15-150 1.211e-08 6.341e-09
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 21.608 sec. to 21.688 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91303 ( -0.514665 0.760622 )
Norm@50keV : 1.303753E-02 ( -6.321326E-03 5.786019E-03) )
------------------------------------------------------------
Chi-Squared = 52.26047 using 59 PHA bins.
Reduced chi-squared = 0.9168504 for 57 degrees of freedom
Null hypothesis probability = 0.653
Photon flux (15-150 keV) in 8.0000E-02 sec: 1.88144 ( -0.73762 0.73775 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.58488e-09 ( -4.27263e-09 4.33424e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.608 sec. to 21.688 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.519224 ( -2.48078 2.58654 )
Epeak [keV] : 64.5616 ( -64.5516 9935.44 )
Norm@50keV : 0.153970 ( -0.153970 1.66491 )
------------------------------------------------------------
Chi-Squared = 49.73751 using 59 PHA bins.
but latest trial 1.81903 gives Chi-Squared = 3.20873
Reduced chi-squared = 0.8881698 for 56 degrees of freedom
Null hypothesis probability = 0.709
Photon flux (15-150 keV) in 8.0000E-02 sec: 1.87228 ( -0.77585 0.76331 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13068e-08 ( -4.59714e-09 4.75048e-09 ) ergs/cm2
Band function
Time interval is from 21.608 sec. to 21.688 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.443942 ( -10.4439 4.55606 )
beta : -9.34548 ( -0.654519 19.3454 )
Epeak [keV] : 65.4639 ( -24.5543 9934.54 )
Norm@50keV : 0.140884 ( -5.164088E-02 12.9589 )
------------------------------------------------------------
Chi-Squared = 49.74283 using 59 PHA bins.
Reduced chi-squared = 0.9044151 for 55 degrees of freedom
Null hypothesis probability = 0.675
Photon flux (15-150 keV) in 8.0000E-02 sec: 1.87665 ( -0.68725 0.68918 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12507e-08 ( -4.77365e-09 4.79952e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.7320 -5.087 5.946
R^2/D10^2 : 0.175414 -0.119696 0.410582
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 49.69835 using 59 PHA bins.
Reduced chi-squared = 0.8719008 for 57 degrees of freedom
Null hypothesis probability = 0.743
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.035e-10 4.334e-10
25- 50 3.510e-09 1.616e-09
50-150 6.980e-09 4.732e-09
15-150 1.129e-08 6.127e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.0910 -99.0909 100.909
Norm : 8.83165 -3.53464 4.84425
------------------------------------------------------------
Chi-Squared = 51.01712 using 59 PHA bins.
Reduced chi-squared = 0.8950371 for 57 degrees of freedom
Null hypothesis probability = 0.698
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.847e-09 8.280e-10
25- 50 3.187e-09 1.675e-09
50-150 5.138e-09 3.495e-09
15-150 1.017e-08 5.749e-09
Double BB
kT1 [keV] : 2.34587 -1.23012 5.61332
R1^2/D10^2 : 388.246 -387.978 17202.6
kT2 [keV] : 18.2198 -5.4269 3.4413
R2^2/D10^2 : 0.120640 -0.0603202 0.179711
------------------------------------------------------------
Chi-Squared = 46.84695 using 59 PHA bins.
but latest trial 1.11575 gives Chi-Squared = 0.579834
but latest trial 17590.8 gives Chi-Squared = 0.303101
but latest trial 25.0205 gives Chi-Squared = 2.78414
but latest trial 3.115997E-03 gives Chi-Squared = 10.5058
but latest trial 0.300263 gives Chi-Squared = 4.65451
Reduced chi-squared = 0.8517627 for 55 degrees of freedom
Null hypothesis probability = 0.775
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.698e-09 9.232e-10
25- 50 3.041e-09 1.686e-09
50-150 7.207e-09 4.761e-09
15-150 1.195e-08 6.704e-09
Plot creation:
Sat May 9 06:18:17 EDT 2009