batgrbproduct Analysis for Trigger=511235
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 Jan 7 03:30:11 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger511235/GCN5_download_cron
======================================================================
Trigger: 00511235 Segment: 000
BAT Trigger Time: 347552192 [s; MET]
Trigger Stop: 347552193.024 [s; MET]
UTC: 2012-01-06T14:16:24.245280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 66.1293574039097 Dec: 64.0284749529581 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.96
Image Trigger?: NO
Rate S/N Ratio: 19.6214168703486 [ if not an image trigger ]
Image S/N Ratio: 8.96
Flight Position: [ source = BAT ]
RA: 66.1293574039097 Dec: 64.0284749529581 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 66.1287711333335 Dec: 64.0500268906055 [deg; J2000]
{ 04h 24m 30.9s , +64d 03' 00.1" }
+/- 1.2762526299448 [arcmin] (estimated 90% radius based on SNR)
+/- 0.445900713825801 [arcmin] (formal 1-sigma fit error)
SNR: 21.4674425089048
Angular difference between Flight and Ground position is 1.293208 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 61.6599999666214 +/- 4.0800980651339
Measured from: -5.34799987077713
to: 56.3120000958443 [s; relative to TRIGTIME]
T50: 7.57599991559982 +/- 42.4196959912443
Measured from: -2.55199986696243
to: 5.02400004863739 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.459999978542328
to: 1.45999997854233 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.283999979496
to: 60.2480000257492 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.454205 0.569210 0.470790 0.097970
0.049992 0.051609 0.045847 0.040579 [error]
Peak 0.047885 0.062916 0.062101 0.019320
0.007197 0.007664 0.007458 0.005691 [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 1.36e-07 2.45e-07 3.39e-07 9.77e-07 9.75e-07 1.70e-06 erg/cm2
Error 2.15e-08 2.41e-08 4.46e-08 2.73e-07 1.07e-07 3.09e-07 erg/cm2
Peak flux Power-law 4.31e-01 4.84e-01 3.89e-01 5.19e-01 1.50e+00 1.82e+00 ph/cm2/s
Error 9.24e-02 6.48e-02 5.72e-02 1.56e-01 1.84e-01 2.32e-01 ph/cm2/s
Fluence Cutoff-PL 1.31e-07 2.52e-07 3.43e-07 6.46e-07 9.54e-07 1.37e-06 erg/cm2
Error 2.42e-08 2.98e-08 4.70e-08 4.91e-07 1.20e-07 5.12e-07 erg/cm2
Peak flux Cutoff-PL 3.78e-01 5.10e-01 4.16e-01 2.83e-01 1.46e+00 1.59e+00 ph/cm2/s
Error 1.15e-01 7.61e-02 6.96e-02 2.45e-01 1.90e-01 2.29e-01 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 1.62e+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 1.531 0.168 - - 1.55e-03 1.55e-04 56.100 57
CPL 1.283 0.537 138.3 0.0 2.10e-03 1.70e-03 55.610 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.316 0.204 - - 1.25e-02 1.53e-03 37.150 57
CPL 0.686 0.875 111.2 -34.4 2.51e-02 3.20e-02 35.530 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: 7.360000 sec.
T50 in the 50-300 keV band: 3.840000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 66.532 -6.284 60.248
T90 61.660 -5.348 56.312
T50 7.576 -2.552 5.024
Peak 1.000 0.460 1.460
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
66.1288 +64.0500 0.0090 28.9 16.1 1.3529 21.5 TRIG_00511235
------------------------------------------
Foreground time interval of the image:
-6.284 12.301 (delta_t = 18.585 [sec])
Background time interval of the image:
-239.000 -6.284 (delta_t = 232.716 [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 -6.284 sec. to 60.248 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53077 ( -0.16748 0.169009 )
Norm@50keV : 1.55287E-03 ( -0.000155556 0.000154332 )
------------------------------------------------------------
# Chi-Squared = 56.10 using 59 PHA bins.
# Reduced chi-squared = 0.9842 for 57 degrees of freedom
# Null hypothesis probability = 5.088337e-01
Photon flux (15-150 keV) in 66.53 sec: 0.195508 ( -0.018888 0.0189053 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.75343e-07 ( -1.06586e-07 1.07842e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.284 sec. to 60.248 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28289 ( -0.681193 0.392811 )
Epeak [keV] : 138.252 ( -138.258 -138.258 )
Norm@50keV : 2.09841E-03 ( -0.000794335 0.00260853 )
------------------------------------------------------------
# Chi-Squared = 55.61 using 59 PHA bins.
# Reduced chi-squared = 0.9931 for 56 degrees of freedom
# Null hypothesis probability = 4.894497e-01
Photon flux (15-150 keV) in 66.53 sec: 0.193474 ( -0.01953 0.019502 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.53747e-07 ( -1.20047e-07 1.19687e-07 ) ergs/cm2
Band function
Time interval is from -6.284 sec. to 60.248 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99720 ( -694.24 -684.24 )
beta : -1.67335 ( -0.219872 0.202623 )
Epeak [keV] : 25.7365 ( -5.94747 4.50659 )
Norm@50keV : 144.853 ( -92.2526 631.513 )
------------------------------------------------------------
# Chi-Squared = 52.44 using 59 PHA bins.
# Reduced chi-squared = 0.9534 for 55 degrees of freedom
# Null hypothesis probability = 5.730941e-01
Photon flux (15-150 keV) in 66.53 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] : 13.9846 (-1.78079 2.0925)
R^2/D10^2 : 2.77620E-02 (-0.0107631 0.0173577)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 83.33 using 59 PHA bins.
# Reduced chi-squared = 1.462 for 57 degrees of freedom
# Null hypothesis probability = 1.306332e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.631e-08 1.358e-08
25- 50 2.835e-07 3.669e-08
50-150 3.649e-07 7.601e-08
15-150 7.247e-07 9.121e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.360 (-74.913 -199.855)
Norm : 0.797838 (-0.0758081 0.0758942)
------------------------------------------------------------
# Chi-Squared = 55.61 using 59 PHA bins.
# Reduced chi-squared = 0.9756 for 57 degrees of freedom
# Null hypothesis probability = 5.274711e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.322e-07 6.972e-08
25- 50 2.543e-07 1.338e-07
50-150 5.576e-07 2.963e-07
15-150 9.441e-07 4.983e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.63677 (-1.49444 1.9358)
R1^2/D10^2 : 0.262168 (-0.150216 0.38878)
kT2 [keV] : 26.3042 (-6.32957 14.0216)
R2^2/D10^2 : 2.40718E-03 (-0.00181216 0.0040976)
------------------------------------------------------------
# Chi-Squared = 53.16 using 59 PHA bins.
# Reduced chi-squared = 0.9666 for 55 degrees of freedom
# Null hypothesis probability = 5.451971e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.351e-07 6.793e-08
25- 50 2.524e-07 8.629e-08
50-150 5.735e-07 3.032e-07
15-150 9.610e-07 3.961e-07
Peak spectrum fit
Power-law model
Time interval is from 0.460 sec. to 1.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31598 ( -0.202879 0.204484 )
Norm@50keV : 1.24942E-02 ( -0.00152774 0.00152468 )
------------------------------------------------------------
# Chi-Squared = 37.15 using 59 PHA bins.
# Reduced chi-squared = 0.6517 for 57 degrees of freedom
# Null hypothesis probability = 9.807201e-01
Photon flux (15-150 keV) in 1 sec: 1.49506 ( -0.184162 0.184371 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22991e-07 ( -1.67519e-08 1.68991e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.460 sec. to 1.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.686298 ( -1.02954 0.720388 )
Epeak [keV] : 111.163 ( -42.3771 -111.163 )
Norm@50keV : 2.51142E-02 ( -0.0135439 0.0505181 )
------------------------------------------------------------
# Chi-Squared = 35.53 using 59 PHA bins.
# Reduced chi-squared = 0.6344 for 56 degrees of freedom
# Null hypothesis probability = 9.851096e-01
Photon flux (15-150 keV) in 1 sec: 1.46226 ( -0.19072 0.18994 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19154e-07 ( -1.7981e-08 1.7889e-08 ) ergs/cm2
Band function
Time interval is from 0.460 sec. to 1.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.686260 ( -0.511897 0.783283 )
beta : -10.00000 ( 7.19744e+10 7.19744e+10 )
Epeak [keV] : 111.144 ( -40.4359 -111.144 )
Norm@50keV : 2.51143E-02 ( -0.0135455 0.0505518 )
------------------------------------------------------------
# Chi-Squared = 35.53 using 59 PHA bins.
# Reduced chi-squared = 0.6460 for 55 degrees of freedom
# Null hypothesis probability = 9.807977e-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] : 17.2590 (-2.38148 2.84878)
R^2/D10^2 : 0.112618 (-0.0454031 0.0730681)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 44.39 using 59 PHA bins.
# Reduced chi-squared = 0.7788 for 57 degrees of freedom
# Null hypothesis probability = 8.883244e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.803e-09 1.551e-09
25- 50 3.046e-08 5.475e-09
50-150 6.510e-08 1.405e-08
15-150 1.024e-07 1.891e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.997 ( )
Norm : 6.17212 (-6.17212 -6.17212)
------------------------------------------------------------
# Chi-Squared = 39.89 using 59 PHA bins.
# Reduced chi-squared = 0.6999 for 57 degrees of freedom
# Null hypothesis probability = 9.585449e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.537e-08 8.285e-09
25- 50 2.957e-08 1.581e-08
50-150 6.484e-08 3.529e-08
15-150 1.098e-07 5.910e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.97911 (-2.22828 9.23376)
R1^2/D10^2 : 8.92417 (-8.61331 1393.21)
kT2 [keV] : 20.3623 (-3.59472 53.2437)
R2^2/D10^2 : 5.99134E-02 (-0.0590928 0.0604512)
------------------------------------------------------------
# Chi-Squared = 35.97 using 59 PHA bins.
# Reduced chi-squared = 0.6540 for 55 degrees of freedom
# Null hypothesis probability = 9.780071e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.267e-08 5.756e-09
25- 50 2.678e-08 8.220e-09
50-150 7.386e-08 2.454e-08
15-150 1.133e-07 3.208e-08
Plot creation:
Sat Jan 7 03:49:51 EST 2012