batgrbproduct Analysis for Trigger=444643
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 v2.46
Process Start Time (local time): Sat Feb 5 12:09:54 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger444643/GCN5_download_cron
======================================================================
Trigger: 00444643 Segment: 000
BAT Trigger Time: 318564168 [s; MET]
Trigger Stop: 318564232 [s; MET]
UTC: 2011-02-05T02:02:41.367420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 164.588577929917 Dec: 67.5160714352078 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.04
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.04
Flight Position: [ source = BAT ]
RA: 164.588577929917 Dec: 67.5160714352078 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 164.603159248738 Dec: 67.5325459471981 [deg; J2000]
{ 10h 58m 24.8s , +67d 31' 57.2" }
+/- 2.2068048952923 [arcmin] (estimated 90% radius based on SNR)
+/- 0.922434134409369 [arcmin] (formal 1-sigma fit error)
SNR: 9.81809068222669
Angular difference between Flight and Ground position is 1.043521 arcmin
Partial Coding Fraction: 0.2929688 [ including projection effects ]
Duration
T90: 266.823999941349 +/- 14.9647560551292
Measured from: 27.7880001068115
to: 294.612000048161 [s; relative to TRIGTIME]
T50: 103.55999994278 +/- 5.3391909698704
Measured from: 114.772000133991
to: 218.332000076771 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 210.439999997616
to: 211.439999997616 [s; relative to TRIGTIME]
Total Fluence
Measured from: -129.77999997139
to: 377.231999993324 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.393019 10.118253 7.010658 1.580659
0.154013 0.159946 0.141724 0.124842 [error]
Peak 0.102462 0.143825 0.128345 0.038666
0.005910 0.006805 0.006422 0.004809 [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 3.15e-06 4.82e-06 5.53e-06 1.22e-05 1.71e-05 2.57e-05 erg/cm2
Error 1.41e-07 1.23e-07 1.57e-07 7.90e-07 3.85e-07 8.70e-07 erg/cm2
Peak flux Power-law 1.20e+00 1.20e+00 8.45e-01 9.41e-01 3.62e+00 4.19e+00 ph/cm2/s
Error 1.10e-01 6.75e-02 5.31e-02 1.22e-01 1.92e-01 2.13e-01 ph/cm2/s
Fluence Cutoff-PL 2.96e-06 4.88e-06 5.64e-06 8.89e-06 1.68e-05 2.24e-05 erg/cm2
Error 1.90e-07 1.31e-07 1.75e-07 1.97e-06 4.42e-07 2.03e-06 erg/cm2
Peak flux Cutoff-PL 1.13e+00 1.23e+00 8.72e-01 7.02e-01 3.57e+00 3.93e+00 ph/cm2/s
Error 1.38e-01 7.54e-02 6.27e-02 3.20e-01 0.00e+00 0.00e+00 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 3.88e+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 1.800 0.044 - - 3.67e-03 8.19e-05 47.410 57
CPL 1.527 0.185 94.2 61.5 4.89e-03 9.18e-04 41.720 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 1.509 0.089 - - 2.89e-02 1.49e-03 70.220 57
CPL 1.219 0.344 144.6 -46.0 3.98e-02 1.52e-02 68.110 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: 252.224000 sec.
T50 in the 50-300 keV band: 99.776000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 507.012 -129.780 377.232
T90 266.824 27.788 294.612
T50 103.560 114.772 218.332
Peak 1.000 210.440 211.440
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
164.6032 +67.5325 0.0195 43.2 160.0 2.7423 9.8 TRIG_00444643
------------------------------------------
Foreground time interval of the image:
-70.499 71.701 (delta_t = 142.200 [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
Multiple GTIs in the spectrum
tstart tstop
-129.780000 227.048000
228.000000 377.232000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80016 ( -0.0436433 0.0437931 )
Norm@50keV : 3.67151E-03 ( -8.18912e-05 8.18627e-05 )
------------------------------------------------------------
# Chi-Squared = 47.41 using 59 PHA bins.
# Reduced chi-squared = 0.8318 for 57 degrees of freedom
# Null hypothesis probability = 8.134251e-01
Photon flux (15-150 keV) in 506.1 sec: 0.505957 ( -0.0134267 0.0135001 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71061e-05 ( -3.84955e-07 3.85114e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-129.780000 227.048000
228.000000 377.232000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52721 ( -0.16864 0.20121 )
Epeak [keV] : 94.1757 ( -17.4014 105.541 )
Norm@50keV : 4.89341E-03 ( -0.000895183 0.000940708 )
------------------------------------------------------------
# Chi-Squared = 41.72 using 59 PHA bins.
# Reduced chi-squared = 0.7451 for 56 degrees of freedom
# Null hypothesis probability = 9.221960e-01
Photon flux (15-150 keV) in 506.1 sec: 0.493832 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68044e-05 ( -4.42686e-07 4.41167e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-129.780000 227.048000
228.000000 377.232000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45933 ( -0.394872 0.534966 )
beta : -1.96407 ( 1.93545 0.11703 )
Epeak [keV] : 80.0024 ( -20.5331 78.999 )
Norm@50keV : 5.35492E-03 ( -0.00130676 0.00736475 )
------------------------------------------------------------
# Chi-Squared = 41.20 using 59 PHA bins.
# Reduced chi-squared = 0.7491 for 55 degrees of freedom
# Null hypothesis probability = 9.162811e-01
Photon flux (15-150 keV) in 506.1 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 210.440 sec. to 211.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50894 ( -0.0884039 0.0890941 )
Norm@50keV : 2.89212E-02 ( -0.00148692 0.00148357 )
------------------------------------------------------------
# Chi-Squared = 70.22 using 59 PHA bins.
# Reduced chi-squared = 1.232 for 57 degrees of freedom
# Null hypothesis probability = 1.121975e-01
Photon flux (15-150 keV) in 1 sec: 3.61925 ( -0.192037 0.192359 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.73964e-07 ( -1.5153e-08 1.51962e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 210.440 sec. to 211.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21881 ( -0.364995 0.323337 )
Epeak [keV] : 144.647 ( -52.6925 -144.647 )
Norm@50keV : 3.97935E-02 ( -0.0114999 0.0189812 )
------------------------------------------------------------
# Chi-Squared = 68.11 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 56 degrees of freedom
# Null hypothesis probability = 1.287067e-01
Photon flux (15-150 keV) in 1 sec: 3.56948 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.70292e-07 ( -1.5978e-08 1.5894e-08 ) ergs/cm2
Band function
Time interval is from 210.440 sec. to 211.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21891 ( -0.146923 0.377143 )
beta : -10.00000 ( 3.15472e+14 3.15472e+14 )
Epeak [keV] : 144.662 ( -52.722 -144.661 )
Norm@50keV : 3.97837E-02 ( -0.0114988 0.01899 )
------------------------------------------------------------
# Chi-Squared = 68.11 using 59 PHA bins.
# Reduced chi-squared = 1.238 for 55 degrees of freedom
# Null hypothesis probability = 1.103506e-01
Photon flux (15-150 keV) in 1 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:
Sat Feb 5 12:40:08 EST 2011