batgrbproduct Analysis for Trigger=352445
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 v2.44
Process Start Time (local time): Tue May 19 13:47:46 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger352445/SDC
======================================================================
Trigger: 00352445 Segment: 000
BAT Trigger Time: 264329830.464 [s; MET]
Trigger Stop: 264329846.848 [s; MET]
UTC: 2009-05-18T08:57:05.712820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 340.236272541621 Dec: -80.5434730875853 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.63
Image Trigger?: NO
Rate S/N Ratio: 12.0830459735946 [ if not an image trigger ]
Image S/N Ratio: 5.63
Flight Position: [ source = BAT ]
RA: 340.236272541621 Dec: -80.5434730875853 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 339.858241489471 Dec: -80.5104029678979 [deg; J2000]
{ 22h 39m 26.0s , -80d 30' 37.5" }
+/- 5.7935982182333 [arcmin] (estimated 90% radius based on SNR)
+/- 3.83446111789988 [arcmin] (formal 1-sigma fit error)
SNR: 2.47281787578818
Angular difference between Flight and Ground position is 4.227622 arcmin
Partial Coding Fraction: 0.640625 [ including projection effects ]
Duration
T90: 16.3840000033379 +/-
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
T50: 16.3840000033379 +/-
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 16.3840000033379 second)
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.152047 0.055714 -0.063092 0.007391
0.030810 0.030072 0.026249 0.025150 [error]
Peak 0.152047 0.055714 -0.063092 0.007391
0.030810 0.030072 0.026249 0.025150 [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 4.09e-08 2.31e-08 8.22e-09 3.84e-09 7.43e-08 7.56e-08 erg/cm2
Error 1.55e-08 1.35e-08 1.04e-08 9.31e-09 3.42e-08 3.68e-08 erg/cm2
Peak flux Power-law 8.41e-02 2.69e-02 4.79e-03 9.91e-04 1.16e-01 1.17e-01 ph/cm2/s
Error 3.20e-02 1.51e-02 5.87e-03 2.21e-03 4.53e-02 4.56e-02 ph/cm2/s
Fluence Cutoff-PL 5.05e-08 2.15e-08 2.16e-11 4.19e-20 7.20e-08 7.20e-08 erg/cm2
Error 1.83e-08 1.83e-08 2.26e-09 0.00e+00 2.63e-08 2.63e-08 erg/cm2
Peak flux Cutoff-PL 9.85e-02 2.80e-02 1.54e-05 1.51e-14 1.27e-01 1.27e-01 ph/cm2/s
Error 3.65e-02 2.16e-02 1.46e-03 0.00e+00 4.24e-02 4.25e-02 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 3.483 0.956 - - 2.92e-04 2.97e-04 44.810 57
CPL 1.000 0.000 50.0 0.0 1.64e-03 0.00e+00 56.830 56
The chi2 of BB fit is 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 3.483 0.956 - - 2.92e-04 2.97e-04 44.810 57
CPL 1.000 0.000 50.0 0.0 1.64e-03 0.00e+00 56.830 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 16.384 0.000 16.384
T90 16.384 0.000 16.384
T50 16.384 0.000 16.384
Peak 16.384 0.000 16.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
339.8582 -80.5104 0.0779 39.6 -169.3 0.1795 2.5 TRIG_00352445
------------------------------------------
Foreground time interval of the image:
0.000 16.384 (delta_t = 16.384 [sec])
Background time interval of the image:
-60.464 -38.464 (delta_t = 22.000 [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 0.000 sec. to 16.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.48280 ( -0.799896 1.11141 )
Norm@50keV : 2.92093E-04 ( -0.000291453 0.000302483 )
------------------------------------------------------------
# Chi-Squared = 44.81 using 59 PHA bins.
# Reduced chi-squared = 0.7862 for 57 degrees of freedom
# Null hypothesis probability = 8.792455e-01
Photon flux (15-150 keV) in 16.38 sec: 0.116432 ( -0.0449915 0.0456562 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.43318e-08 ( -3.08152e-08 3.75539e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.64214E-03 ( )
------------------------------------------------------------
# Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 56 degrees of freedom
# Null hypothesis probability = 4.438262e-01
Photon flux (15-150 keV) in 16.38 sec: 0.126581 ( -0.0414337 0.043452 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.20012e-08 ( -2.40662e-08 2.8495e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.96122 ( 0.892705 7.21201 )
beta : -3.53547 ( -1.09489 0.814243 )
Epeak [keV] : 60.8176 ( -60.8176 -60.8176 )
Norm@50keV : 3.77365E-02 ( -0.0390631 0.0416656 )
------------------------------------------------------------
# Chi-Squared = 44.82 using 59 PHA bins.
# Reduced chi-squared = 0.8149 for 55 degrees of freedom
# Null hypothesis probability = 8.348556e-01
Photon flux (15-150 keV) in 16.38 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 0.000 sec. to 16.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.48280 ( -0.799896 1.11141 )
Norm@50keV : 2.92093E-04 ( -0.000291453 0.000302483 )
------------------------------------------------------------
# Chi-Squared = 44.81 using 59 PHA bins.
# Reduced chi-squared = 0.7862 for 57 degrees of freedom
# Null hypothesis probability = 8.792455e-01
Photon flux (15-150 keV) in 16.38 sec: 0.116432 ( -0.0449915 0.0456562 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.43318e-08 ( -3.08152e-08 3.75539e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.64214E-03 ( )
------------------------------------------------------------
# Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 56 degrees of freedom
# Null hypothesis probability = 4.438262e-01
Photon flux (15-150 keV) in 16.38 sec: 0.126581 ( -0.0414337 0.043452 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.20012e-08 ( -2.40662e-08 2.8495e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.96122 ( 0.892705 7.21201 )
beta : -3.53547 ( -1.09489 0.814243 )
Epeak [keV] : 60.8176 ( -60.8176 -60.8176 )
Norm@50keV : 3.77365E-02 ( -0.0390631 0.0416656 )
------------------------------------------------------------
# Chi-Squared = 44.82 using 59 PHA bins.
# Reduced chi-squared = 0.8149 for 55 degrees of freedom
# Null hypothesis probability = 8.348556e-01
Photon flux (15-150 keV) in 16.38 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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:
Wed Jun 1 17:31:34 EDT 2011