batgrbproduct Analysis for Trigger=362785
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): Wed Dec 30 14:17:41 EST 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/362785
======================================================================
Trigger: 00362785 Segment: 000
BAT Trigger Time: 274721741.312 [s; MET]
Trigger Stop: 274721751.312 [s; MET]
UTC: 2009-09-15T15:35:41.312000 [includes UTCF correction]
WARNING: UTCFINIT is zero. This is suspicious.
Where From?: TDRSS position message
BAT
RA: 237.99 Dec: 15.48 [deg; J2000]
Catalogged Source?: NO
Point Source?: NO
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio:
Image Trigger?: NO
Rate S/N Ratio: [ if not an image trigger ]
Image S/N Ratio:
Flight Position: [ source = BAT ]
RA: 237.99 Dec: 15.48 [deg; J2000]
Partial Coding Fraction: 0.1220703 [ including projection effects ]
Angular difference between Flight and Ground position is 0.000000 arcmin
Partial Coding Fraction: 0.1220703 [ including projection effects ]
Duration
T90: 10 +/-
Measured from: 0
to: 10 [s; relative to TRIGTIME]
T50: 10 +/-
Measured from: 0
to: 10 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 10 second)
Measured from: 0
to: 10 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 10 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.071517 0.213703 0.330570 0.093931
0.055541 0.054322 0.052392 0.055410 [error]
Peak 0.071517 0.213703 0.330570 0.093931
0.055541 0.054322 0.052392 0.055410 [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 5.20e-08 1.21e-07 2.23e-07 9.84e-07 6.05e-07 1.38e-06 erg/cm2
Error 2.27e-08 3.28e-08 5.01e-08 4.88e-07 1.32e-07 5.10e-07 erg/cm2
Peak flux Power-law 3.45e-01 3.83e-01 3.05e-01 4.01e-01 1.18e+00 1.43e+00 ph/cm2/s
Error 3.62e-01 2.32e-01 1.63e-01 4.70e-01 6.46e-01 1.08e+00 ph/cm2/s
Fluence Cutoff-PL 1.85e-08 1.20e-07 2.90e-07 1.44e-07 5.43e-07 6.07e-07 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 Cutoff-PL 9.21e-02 4.29e-01 3.89e-01 3.03e-02 9.39e-01 9.40e-01 ph/cm2/s
Error 2.90e-01 3.72e-01 3.27e-01 1.94e-01 6.25e-01 7.41e-01 ph/cm2/s
Fluence Band 2.29e-08 1.15e-07 2.96e-07 1.14e-07 5.23e-07 6.19e-07 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 1.23e-01 4.26e-01 3.90e-01 1.01e-01 1.02e+00 1.04e+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 1.118 0.355 - - 1.02e-02 2.26e-03 60.520 57
CPL -2.221 4.315 78.2 28.6 2.05e-01 1.22e+01 53.830 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 1.331 0.855 - - 9.84e-03 7.41e-03 47.710 57
CPL -3.349 0.000 60.9 -20.8 1.30e+00 8.88e+02 46.190 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 10.000 0.000 10.000
T90 10.000 0.000 10.000
T50 10.000 0.000 10.000
Peak 10.000 0.000 10.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
Foreground time interval of the image:
0.000 5.712 (delta_t = 5.712 [sec])
Background time interval of the image:
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 5.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11778 ( -0.363058 0.346382 )
Norm@50keV : 1.01894E-02 ( -0.00226869 0.0022456 )
------------------------------------------------------------
# Chi-Squared = 60.52 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.498426e-01
Photon flux (15-150 keV) in 5.712 sec: 1.18387 ( -0.273181 0.279657 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.05141e-07 ( -1.31663e-07 1.32329e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 5.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.22119 ( -6.15486 2.47593 )
Epeak [keV] : 78.1610 ( -13.2923 43.8316 )
Norm@50keV : 0.205303 ( -0.220936 24.0956 )
------------------------------------------------------------
# Chi-Squared = 53.83 using 59 PHA bins.
# Reduced chi-squared = 0.9613 for 56 degrees of freedom
# Null hypothesis probability = 5.573063e-01
Photon flux (15-150 keV) in 5.712 sec: 0.988807 ( -0.285175 0.301823 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.42846e-07 ( 1.40126e-07 -5.42846e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 5.712 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.99609 ( -2.1438 -1.99596 )
beta : -9.37164 ( 9.99998 20 )
Epeak [keV] : 80.6514 ( -14.935 30.2691 )
Norm@50keV : 0.162562 ( -0.162769 3.00483 )
------------------------------------------------------------
# Chi-Squared = 53.87 using 59 PHA bins.
# Reduced chi-squared = 0.9795 for 55 degrees of freedom
# Null hypothesis probability = 5.177858e-01
Photon flux (15-150 keV) in 5.712 sec: 0.997441 ( -0.243378 0.210479 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.22663e-07 ( -1.11183e-07 1.05537e-07 ) 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 0.688 sec. to 1.688 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33118 ( -0.870523 0.839788 )
Norm@50keV : 9.83710E-03 ( -0.00983752 0.00497708 )
------------------------------------------------------------
# Chi-Squared = 47.71 using 59 PHA bins.
# Reduced chi-squared = 0.8371 for 57 degrees of freedom
# Null hypothesis probability = 8.047726e-01
Photon flux (15-150 keV) in 1 sec: 1.18075 ( -0.631499 0.660141 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.64828e-08 ( -4.89389e-08 4.94817e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.688 sec. to 1.688 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.34876 ( )
Epeak [keV] : 60.8532 ( -19.1393 -60.7814 )
Norm@50keV : 1.30368 ( -1.44698 1774.15 )
------------------------------------------------------------
# Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8247 for 56 degrees of freedom
# Null hypothesis probability = 8.222300e-01
Photon flux (15-150 keV) in 1 sec: 0.939314 ( -0.516819 0.733476 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.61281e-08 ( -4.02661e-08 6.04439e-08 ) ergs/cm2
Band function
Time interval is from 0.688 sec. to 1.688 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.34303 ( -6.1725 -6.1725 )
beta : -4.18138 ( 4.74036 4.74036 )
Epeak [keV] : 61.6752 ( -60.8269 90.4983 )
Norm@50keV : 1.21742 ( -1.21862 7.68989 )
------------------------------------------------------------
# Chi-Squared = 46.05 using 59 PHA bins.
# Reduced chi-squared = 0.8372 for 55 degrees of freedom
# Null hypothesis probability = 7.996387e-01
Photon flux (15-150 keV) in 1 sec: 1.01704 ( -0.484045 0.60872 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.65865e-08 ( -4.11294e-08 5.08905e-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:
Tue May 31 17:19:13 EDT 2011