batgrbproduct Analysis for Trigger=352108
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 batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.45
Process Start Time (local time): Tue Aug 11 05:26:58 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/352108
======================================================================
Trigger: 00352108 Segment: 000
BAT Trigger Time: 264055514.268 [s; MET]
Trigger Stop: 264055514.3 [s; MET]
UTC: 2009-05-15T04:45:09.525600 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 164.170933861596 Dec: 14.4560193879202 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.79
Image Trigger?: NO
Rate S/N Ratio: 38.3927076409049 [ if not an image trigger ]
Image S/N Ratio: 9.79
Flight Position: [ source = BAT ]
RA: 164.170933861596 Dec: 14.4560193879202 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 164.16441892284 Dec: 14.4658259521476 [deg; J2000]
{ 10h 56m 39.5s , +14d 27' 57.0" }
+/- 2.03775448700896 [arcmin] (estimated 90% radius based on SNR)
+/- 1.05811872142708 [arcmin] (formal 1-sigma fit error)
SNR: 11.002031103984
Angular difference between Flight and Ground position is 0.699628 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 0.0360000133514404 +/- 0.0164924197847099
Measured from: 0.00799998641014099
to: 0.0439999997615814 [s; relative to TRIGTIME]
T50: 0.0160000026226044 +/- 0.00799998641014099
Measured from: 0.0119999945163727
to: 0.0279999971389771 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.466000020503998
to: 0.533999979496002 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00799998641014099
to: 0.0559999942779541 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.009441 0.015846 0.012522 0.003094
0.001881 0.002204 0.001982 0.001368 [error]
Peak 0.010136 0.015835 0.011943 0.002878
0.001949 0.002237 0.002004 0.001380 [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 2.71e-09 5.27e-09 7.93e-09 2.59e-08 2.23e-08 4.18e-08 erg/cm2
Error 6.86e-10 8.98e-10 1.55e-09 9.95e-09 3.92e-09 1.13e-08 erg/cm2
Peak flux Power-law 6.69e-02 8.97e-02 8.87e-02 1.57e-01 2.97e-01 4.03e-01 ph/cm2/s
Error 5.62e-02 4.75e-02 4.02e-02 1.87e-01 1.29e-01 1.87e-01 ph/cm2/s
Fluence Cutoff-PL 2.16e-09 6.08e-09 9.30e-09 7.70e-09 2.21e-08 2.52e-08 erg/cm2
Error 8.11e-10 1.16e-09 2.03e-09 4.05e-09 8.89e-09 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.64e-02 9.32e-02 9.56e-02 8.42e-02 2.89e-01 3.29e-01 ph/cm2/s
Error 6.48e-02 7.46e-02 4.92e-02 1.79e-01 1.32e-01 1.93e-01 ph/cm2/s
Fluence Band 2.15e-09 6.04e-09 9.31e-09 7.66e-09 2.21e-08 2.34e-08 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 5.63e-02 9.32e-02 9.56e-02 8.41e-02 2.89e-01 3.31e-01 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 1.409 0.236 - - 4.82e-02 7.88e-03 44.740 57
CPL 0.151 1.137 79.8 56.6 1.96e-01 3.78e-01 39.990 56
The chi2 of BB fit is using which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.019 0.783 - - 2.58e-03 1.10e-03 56.760 57
CPL 0.342 2.339 138.8 0.0 5.19e-03 6.63e-01 56.580 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.048 0.008 0.056
T90 0.036 0.008 0.044
T50 0.016 0.012 0.028
Peak 1.000 -0.466 0.534
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
164.1644 +14.4658 0.0175 21.9 20.5 0.0422 11.0 TRIG_00352108
------------------------------------------
Foreground time interval of the image:
0.008 0.056 (delta_t = 0.048 [sec])
Background time interval of the image:
-100.167 0.008 (delta_t = 100.175 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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 0.008 sec. to 0.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40896 ( -0.23325 0.237796 )
Norm@50keV : 4.81823E-02 ( -0.00788995 0.00787017 )
------------------------------------------------------------
# Chi-Squared = 44.74 using 59 PHA bins.
# Reduced chi-squared = 0.7850 for 57 degrees of freedom
# Null hypothesis probability = 8.807371e-01
Photon flux (15-150 keV) in 0.048 sec: 5.87978 ( -0.969476 0.970494 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.23065e-08 ( -3.91503e-09 3.93374e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 0.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.151047 ( -1.27295 1.00202 )
Epeak [keV] : 79.7569 ( -19.3128 93.9545 )
Norm@50keV : 0.195515 ( -0.195515 0.561146 )
------------------------------------------------------------
# Chi-Squared = 39.99 using 59 PHA bins.
# Reduced chi-squared = 0.7141 for 56 degrees of freedom
# Null hypothesis probability = 9.476774e-01
Photon flux (15-150 keV) in 0.048 sec: 5.83824 ( -0.97572 0.97602 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21476e-08 ( -4.04894e-09 4.04741e-09 ) ergs/cm2
Band function
Time interval is from 0.008 sec. to 0.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.150869 ( -0.698139 1.78816 )
beta : -10.00000 ( 1.63772e+11 1.63772e+11 )
Epeak [keV] : 79.7402 ( -19.3098 93.9498 )
Norm@50keV : 0.195568 ( -0.195568 0.561836 )
------------------------------------------------------------
# Chi-Squared = 39.99 using 59 PHA bins.
# Reduced chi-squared = 0.7270 for 55 degrees of freedom
# Null hypothesis probability = 9.360112e-01
Photon flux (15-150 keV) in 0.048 sec: 5.83799 ( -0.97547 0.97615 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21172e-08 ( -4.02797e-09 4.05442e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Peak spectrum fit
Power-law model
Time interval is from -0.466 sec. to 0.534 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01914 ( -0.832134 0.734602 )
Norm@50keV : 2.57515E-03 ( -0.00111806 0.00109009 )
------------------------------------------------------------
# Chi-Squared = 56.76 using 59 PHA bins.
# Reduced chi-squared = 0.9957 for 57 degrees of freedom
# Null hypothesis probability = 4.842179e-01
Photon flux (15-150 keV) in 1 sec: 0.296795 ( -0.127928 0.129668 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76764e-08 ( -1.22998e-08 1.25964e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.466 sec. to 0.534 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.342223 ( -5.01927 -0.342224 )
Epeak [keV] : 138.808 ( -138.832 -138.832 )
Norm@50keV : 5.19215E-03 ( -0.00519158 1.32051 )
------------------------------------------------------------
# Chi-Squared = 56.58 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 56 degrees of freedom
# Null hypothesis probability = 4.532385e-01
Photon flux (15-150 keV) in 1 sec: 0.288854 ( -0.130781 0.133198 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67308e-08 ( -2.67308e-08 1.31443e-08 ) ergs/cm2
Band function
Time interval is from -0.466 sec. to 0.534 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.377719 ( -7.0415 2.89954 )
beta : -9.37093 ( 9.99941 9.99941 )
Epeak [keV] : 144.952 ( -92.0099 -144.881 )
Norm@50keV : 4.97316E-03 ( -0.00290754 0.0100176 )
------------------------------------------------------------
# Chi-Squared = 56.58 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.158039e-01
Photon flux (15-150 keV) in 1 sec: 0.288835 ( -0.130655 0.133292 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62331e-08 ( -1.13156e-08 1.26449e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Plot creation:
Fri May 27 11:23:43 EDT 2011