batgrbproduct Analysis for Trigger=349447
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 Apr 17 19:45:05 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger349447/GCN5_download_cron
======================================================================
Trigger: 00349447 Segment: 000
BAT Trigger Time: 261667048.46 [s; MET]
Trigger Stop: 261667048.524 [s; MET]
UTC: 2009-04-17T13:17:23.793440 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 34.9949091846811 Dec: -7.18107713636088 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.63
Image Trigger?: NO
Rate S/N Ratio: 18.3030052177231 [ if not an image trigger ]
Image S/N Ratio: 7.63
Flight Position: [ source = BAT ]
RA: 34.9949091846811 Dec: -7.18107713636088 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 34.9930867460755 Dec: -7.14148300043235 [deg; J2000]
{ 02h 19m 58.3s , -07d 08' 29.3" }
+/- 2.74850714190486 [arcmin] (estimated 90% radius based on SNR)
+/- 1.45534897242096 [arcmin] (formal 1-sigma fit error)
SNR: 7.1752516530967
Angular difference between Flight and Ground position is 2.378124 arcmin
Partial Coding Fraction: 0.3007812 [ including projection effects ]
Duration
T90: 0.0719999969005585 +/- 0.017888553416166
Measured from: 8.94069671630859e-08
to: 0.0720000863075256 [s; relative to TRIGTIME]
T50: 0.0320000052452087 +/- 0.0178885400881622
Measured from: 0.0120000839233398
to: 0.0440000891685486 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.462000012397766
to: 0.537999987602234 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00400000810623169
to: 0.0760000050067902 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.015623 0.018391 0.026433 0.001753
0.004017 0.004290 0.004049 0.002569 [error]
Peak 0.015606 0.019813 0.027300 0.000857
0.004071 0.004368 0.004090 0.002632 [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 5.65e-09 4.26e-09 2.14e-09 1.55e-09 1.28e-08 1.36e-08 erg/cm2
Error 1.80e-09 1.21e-09 8.48e-10 9.78e-10 3.61e-09 3.91e-09 erg/cm2
Peak flux Power-law 2.32e+00 9.78e-01 2.44e-01 7.45e-02 3.59e+00 3.62e+00 ph/cm2/s
Error 7.31e-01 2.83e-01 1.01e-01 4.79e-02 1.03e+00 1.03e+00 ph/cm2/s
Fluence Cutoff-PL 3.98e-09 9.01e-09 5.75e-09 5.90e-10 1.93e-08 1.89e-08 erg/cm2
Error 2.28e-09 2.65e-09 2.81e-09 4.34e-10 4.92e-09 5.02e-09 erg/cm2
Peak flux Cutoff-PL 1.52e+00 2.02e+00 7.01e-01 3.60e-02 4.28e+00 4.28e+00 ph/cm2/s
Error 1.23e+00 5.49e-01 3.45e-01 2.74e-02 1.14e+00 1.14e+00 ph/cm2/s
Fluence Band 2.12e-09 9.30e-09 6.37e-09 5.51e-10 1.96e-08 1.95e-08 erg/cm2
Error 2.35e-09 2.33e-09 2.88e-10 4.84e-09 4.93e-09 0.00e+00 erg/cm2
Peak flux Band 1.01e+00 2.04e+00 7.29e-01 3.56e-02 4.23e+00 3.96e+00 ph/cm2/s
Error 5.02e-01 2.59e-01 3.31e-02 1.08e+00 9.85e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.988 0.357 - - 1.34e-02 4.45e-03 77.815 57
CPL -0.646 2.108 40.3 12.8 1.07e+00 2.65e+00 67.393 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.003 0.376 - - 1.30e-02 4.61e-03 82.265 57
CPL -0.895 1.867 41.0 12.4 1.42e+00 4.81e+00 70.151 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 0.080 -0.004 0.076
T90 0.072 0.000 0.072
T50 0.032 0.012 0.044
Peak 1.000 -0.462 0.538
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
34.9931 -7.1415 0.0268 33.9 -98.3 0.0583 7.2 TRIG_00349447
------------------------------------------
Foreground time interval of the image:
-0.004 0.076 (delta_t = 0.080 [sec])
Background time interval of the image:
-239.460 -0.004 (delta_t = 239.456 [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 -0.004 sec. to 0.076 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.98799 ( -0.312030 0.402060 )
Norm@50keV : 1.336790E-02 ( -4.574714E-03 4.335061E-03) )
------------------------------------------------------------
Chi-Squared = 77.81496 using 59 PHA bins.
Reduced chi-squared = 1.365175 for 57 degrees of freedom
Null hypothesis probability = 3.488E-02
Photon flux (15-150 keV) in 8.0000E-02 sec: 3.64445 ( -1.05721 1.05679 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27794e-08 ( -3.60784e-09 3.60544e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.076 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.645580 ( -2.35442 1.86117 )
Epeak [keV] : 40.3273 ( -17.4970 8.02527 )
Norm@50keV : 1.07389 ( -1.07389 4.22844 )
------------------------------------------------------------
Chi-Squared = 67.39339 using 59 PHA bins.
but latest trial 8.86750 gives Chi-Squared = 4.03936
Reduced chi-squared = 1.203453 for 56 degrees of freedom
Null hypothesis probability = 0.142
Photon flux (15-150 keV) in 8.0000E-02 sec: 4.31650 ( -1.18054 1.16225 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92614e-08 ( -4.9188e-09 4.92784e-09 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.076 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.313096 ( -1.09578 1.14819 )
beta : -9.32874 ( -0.671256 5.25632 )
Epeak [keV] : 34.2493 ( -6.05465 17.8016 )
Norm@50keV : 0.385955 ( -0.295816 11.5295 )
------------------------------------------------------------
Chi-Squared = 68.07061 using 59 PHA bins.
Reduced chi-squared = 1.237647 for 55 degrees of freedom
Null hypothesis probability = 0.111
Photon flux (15-150 keV) in 8.0000E-02 sec: 4.24268 ( -1.12187 1.09878 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9559e-08 ( -4.83728e-09 4.83656e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.5935 -1.5777 1.2804
R^2/D10^2 : 1.36486 -0.587565 1.0832
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 67.51380 using 59 PHA bins.
Reduced chi-squared = 1.184453 for 57 degrees of freedom
Null hypothesis probability = 0.161
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.093e-09 1.161e-09
25- 50 9.340e-09 2.837e-09
50-150 7.372e-09 2.732e-09
15-150 1.980e-08 6.023e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.9827 -7.768 8.498
Norm : 33.0920 -10.9382 13.1597
------------------------------------------------------------
Chi-Squared = 70.56631 using 59 PHA bins.
Reduced chi-squared = 1.238006 for 57 degrees of freedom
Null hypothesis probability = 0.107
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.638e-09 1.640e-09
25- 50 6.775e-09 1.720e-09
50-150 4.186e-09 1.711e-09
15-150 1.660e-08 4.638e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.27000 -3.2699 11.3985
R1^2/D10^2 : 94.4324 -94.4324 3187.68
kT2 [keV] : 12.1456 -1.6406 0.938
R2^2/D10^2 : 0.975719 -0.975719 1e+24
------------------------------------------------------------
Chi-Squared = 64.89537 using 59 PHA bins.
but latest trial 14.6700 gives Chi-Squared = 2.62032
but latest trial 13.9453 gives Chi-Squared = 3.69918
Reduced chi-squared = 1.179916 for 55 degrees of freedom
Null hypothesis probability = 0.170
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.803e-09 2.232e-09
25- 50 8.242e-09 3.038e-09
50-150 6.958e-09 3.051e-09
15-150 2.000e-08 5.846e-09
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.004 sec. to 0.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.00255 ( -0.321169 0.430314 )
Norm@50keV : 1.302365E-02 ( -4.743433E-03 4.468077E-03) )
------------------------------------------------------------
Chi-Squared = 82.26451 using 59 PHA bins.
Reduced chi-squared = 1.443237 for 57 degrees of freedom
Null hypothesis probability = 1.591E-02
Photon flux (15-150 keV) in 8.4000E-02 sec: 3.58824 ( -1.0275 1.02738 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31601e-08 ( -3.76648e-09 3.76303e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.080 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.894689 ( -1.86420 1.87079 )
Epeak [keV] : 41.0107 ( -15.0682 9.66080 )
Norm@50keV : 1.42293 ( -1.24244 8.37727 )
------------------------------------------------------------
Chi-Squared = 70.15112 using 59 PHA bins.
but latest trial -4.51290 gives Chi-Squared = 4.01689
Reduced chi-squared = 1.252699 for 56 degrees of freedom
Null hypothesis probability = 9.672E-02
Photon flux (15-150 keV) in 8.4000E-02 sec: 4.27687 ( -1.14997 1.12897 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02374e-08 ( -5.07646e-09 5.08998e-09 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.81692 ( -0.298784 0.179833 )
beta : -8.93339 ( -1.06661 5.61946 )
Epeak [keV] : 7.76613 ( -27.0468 7.59644 )
Norm@50keV : 6.662115E-02 ( -0.456175 20.0639 )
------------------------------------------------------------
Chi-Squared = 76.01917 using 59 PHA bins.
Reduced chi-squared = 1.382167 for 55 degrees of freedom
Null hypothesis probability = 3.174E-02
Photon flux (15-150 keV) in 8.4000E-02 sec: 4.23048 ( -1.09812 1.0522 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05437e-08 ( -5.04613e-09 5.01018e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.4455 -1.64043 1.3106
R^2/D10^2 : 1.43542 -0.610012 1.18044
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 69.98379 using 59 PHA bins.
Reduced chi-squared = 1.227786 for 57 degrees of freedom
Null hypothesis probability = 0.116
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.323e-09 1.126e-09
25- 50 9.878e-09 3.414e-09
50-150 7.529e-09 2.670e-09
15-150 2.073e-08 6.495e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.3234 -8.0307 8.6341
Norm : 33.3164 -10.773 13.279
------------------------------------------------------------
Chi-Squared = 74.18104 using 59 PHA bins.
Reduced chi-squared = 1.301422 for 57 degrees of freedom
Null hypothesis probability = 6.275E-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.906e-09 1.693e-09
25- 50 7.023e-09 1.907e-09
50-150 4.232e-09 1.760e-09
15-150 1.716e-08 5.029e-09
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.07015 -3.07005 7.67885
R1^2/D10^2 : 122.141 -122.141 4514.84
kT2 [keV] : 11.9425 -1.6841 0.8755
R2^2/D10^2 : 1.06874 -1.06874 1e+24
------------------------------------------------------------
Chi-Squared = 67.61679 using 59 PHA bins.
but latest trial 10.7739 gives Chi-Squared = 2.86227
but latest trial 10.2645 gives Chi-Squared = 2.67350
but latest trial 13.6458 gives Chi-Squared = 3.55960
Reduced chi-squared = 1.229396 for 55 degrees of freedom
Null hypothesis probability = 0.118
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.918e-09 2.231e-09
25- 50 8.820e-09 3.376e-09
50-150 7.242e-09 3.291e-09
15-150 2.098e-08 6.906e-09
Plot creation:
Fri Apr 17 19:56:37 EDT 2009