batgrbproduct Analysis for Trigger=517469
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): Sun Mar 11 16:52:58 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger517469/GCN5_download_cron
======================================================================
Trigger: 00517469 Segment: 000
BAT Trigger Time: 353136826.304 [s; MET]
Trigger Stop: 353136826.56 [s; MET]
UTC: 2012-03-11T05:33:38.324140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 273.086737373698 Dec: 14.2755565148965 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.99
Image Trigger?: NO
Rate S/N Ratio: 25.0199920063936 [ if not an image trigger ]
Image S/N Ratio: 12.99
Flight Position: [ source = BAT ]
RA: 273.086737373698 Dec: 14.2755565148965 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 273.080004433121 Dec: 14.2982783767135 [deg; J2000]
{ 18h 12m 19.2s , +14d 17' 53.8" }
+/- 1.20967038769632 [arcmin] (estimated 90% radius based on SNR)
+/- 0.574076923243817 [arcmin] (formal 1-sigma fit error)
SNR: 23.1751522065821
Angular difference between Flight and Ground position is 1.418407 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 5 +/- 3.16227766016838
Measured from: -1.30399990081787
to: 3.69600009918213 [s; relative to TRIGTIME]
T50: 1 +/- 1
Measured from: -0.303999900817871
to: 0.696000099182129 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.304000020027161
to: 0.695999979972839 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.30400002002716
to: 5.69599997997284 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.272525 0.242963 0.095422 0.022962
0.017934 0.017552 0.014106 0.011523 [error]
Peak 0.133522 0.130598 0.056175 0.009404
0.008167 0.008142 0.005972 0.004552 [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 8.61e-08 9.91e-08 8.19e-08 1.14e-07 3.08e-07 3.81e-07 erg/cm2
Error 9.87e-09 8.44e-09 1.32e-08 3.56e-08 3.02e-08 5.16e-08 erg/cm2
Peak flux Power-law 1.37e+00 9.38e-01 4.19e-01 2.60e-01 2.86e+00 2.99e+00 ph/cm2/s
Error 1.47e-01 6.82e-02 5.06e-02 5.95e-02 2.13e-01 2.18e-01 ph/cm2/s
Fluence Cutoff-PL 8.31e-08 1.05e-07 7.80e-08 4.65e-08 2.93e-07 0.00e+00 erg/cm2
Error 1.08e-08 1.14e-08 1.57e-08 5.47e-08 3.56e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.31e+00 9.92e-01 4.16e-01 1.32e-01 2.80e+00 2.85e+00 ph/cm2/s
Error 1.67e-01 9.26e-02 5.58e-02 1.10e-01 2.21e-01 2.48e-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 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 2.275 0.170 - - 4.63e-03 5.39e-04 49.770 57
CPL 1.779 0.522 17.5 0.0 9.17e-03 0.00e+00 48.200 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.161 0.138 - - 1.76e-02 1.61e-03 38.180 57
CPL 1.656 0.505 28.4 0.0 3.45e-02 0.00e+00 35.900 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: 0.512000 sec.
T50 in the 50-300 keV band: 0.256000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.000 -1.304 5.696
T90 5.000 -1.304 3.696
T50 1.000 -0.304 0.696
Peak 1.000 -0.304 0.696
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
273.0800 +14.2983 0.0083 21.1 54.2 0.6942 23.2 TRIG_00517469
------------------------------------------
Foreground time interval of the image:
-1.304 5.696 (delta_t = 7.000 [sec])
Background time interval of the image:
-213.103 -31.434 (delta_t = 181.669 [sec])
-30.304 -1.304 (delta_t = 29.000 [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 -1.304 sec. to 5.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27526 ( -0.165776 0.174965 )
Norm@50keV : 4.62838E-03 ( -0.000543871 0.000534206 )
------------------------------------------------------------
# Chi-Squared = 49.77 using 59 PHA bins.
# Reduced chi-squared = 0.8732 for 57 degrees of freedom
# Null hypothesis probability = 7.404996e-01
Photon flux (15-150 keV) in 7 sec: 0.797866 ( -0.0662441 0.0662816 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08239e-07 ( -2.98885e-08 3.04275e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.304 sec. to 5.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77878 ( -0.810514 0.234267 )
Epeak [keV] : 17.4914 ( )
Norm@50keV : 9.16676E-03 ( )
------------------------------------------------------------
# Chi-Squared = 48.20 using 59 PHA bins.
# Reduced chi-squared = 0.8608 for 56 degrees of freedom
# Null hypothesis probability = 7.611742e-01
Photon flux (15-150 keV) in 7 sec: 0.781601 ( -0.069567 0.06961 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.92817e-07 ( -3.45989e-08 3.65064e-08 ) ergs/cm2
Band function
Time interval is from -1.304 sec. to 5.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.79517 ( 1.79516 0.204215 )
beta : -9.37167 ( 10 20 )
Epeak [keV] : 16.8266 ( -8.38435 14.048 )
Norm@50keV : 8.94534E-03 ( -0.00302784 0.00157538 )
------------------------------------------------------------
# Chi-Squared = 48.21 using 59 PHA bins.
# Reduced chi-squared = 0.8765 for 55 degrees of freedom
# Null hypothesis probability = 7.298131e-01
Photon flux (15-150 keV) in 7 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] : 8.51033 (-0.817272 0.900059)
R^2/D10^2 : 0.662913 (-0.221215 0.336527)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 75.41 using 59 PHA bins.
# Reduced chi-squared = 1.323 for 57 degrees of freedom
# Null hypothesis probability = 5.177605e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.339e-08 9.359e-09
25- 50 1.232e-07 1.253e-08
50-150 3.948e-08 9.391e-09
15-150 2.260e-07 2.363e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 43.8951 (-8.78603 12.3918)
Norm : 4.81389 (-0.747008 0.916558)
------------------------------------------------------------
# Chi-Squared = 49.12 using 59 PHA bins.
# Reduced chi-squared = 0.8617 for 57 degrees of freedom
# Null hypothesis probability = 7.618061e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.966e-08 8.887e-09
25- 50 1.089e-07 9.975e-09
50-150 9.301e-08 2.254e-08
15-150 2.816e-07 3.090e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.78009 (-1.30712 1.48305)
R1^2/D10^2 : 4.76860 (-2.99523 13.5534)
kT2 [keV] : 14.8541 (-3.48235 7.32777)
R2^2/D10^2 : 4.93402E-02 (-0.0404701 0.115854)
------------------------------------------------------------
# Chi-Squared = 49.23 using 59 PHA bins.
# Reduced chi-squared = 0.8951 for 55 degrees of freedom
# Null hypothesis probability = 6.938102e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.355e-08 3.815e-08
25- 50 1.024e-07 4.097e-08
50-150 9.535e-08 5.251e-08
15-150 2.813e-07 1.069e-07
Peak spectrum fit
Power-law model
Time interval is from -0.304 sec. to 0.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16073 ( -0.1354 0.1405 )
Norm@50keV : 1.76188E-02 ( -0.00162018 0.00159423 )
------------------------------------------------------------
# Chi-Squared = 38.18 using 59 PHA bins.
# Reduced chi-squared = 0.6698 for 57 degrees of freedom
# Null hypothesis probability = 9.739091e-01
Photon flux (15-150 keV) in 1 sec: 2.85796 ( -0.212472 0.212698 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64796e-07 ( -1.34609e-08 1.35803e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.304 sec. to 0.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65620 ( -0.666606 0.342892 )
Epeak [keV] : 28.3752 ( )
Norm@50keV : 3.44913E-02 ( )
------------------------------------------------------------
# Chi-Squared = 35.90 using 59 PHA bins.
# Reduced chi-squared = 0.6410 for 56 degrees of freedom
# Null hypothesis probability = 9.832431e-01
Photon flux (15-150 keV) in 1 sec: 2.80361 ( -0.22122 0.22093 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71048e-07 ( -2.4549e-08 5.0132e-08 ) ergs/cm2
Band function
Time interval is from -0.304 sec. to 0.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.713862 ( -1.85859 0.173092 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 1.19055 ( )
Norm@50keV : 7.55428E-19 ( )
------------------------------------------------------------
# Chi-Squared = 278.64 using 59 PHA bins.
# Reduced chi-squared = 5.0662 for 55 degrees of freedom
# Null hypothesis probability = 1.206520e-31
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] : 9.38455 (-0.763291 0.83078)
R^2/D10^2 : 1.65645 (-0.478845 0.670739)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 71.83 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 57 degrees of freedom
# Null hypothesis probability = 8.922835e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.898e-08 3.915e-09
25- 50 6.568e-08 5.600e-09
50-150 2.843e-08 6.500e-09
15-150 1.231e-07 1.005e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 53.0749 (-9.5369 13.1874)
Norm : 15.6130 (-1.92396 2.33898)
------------------------------------------------------------
# Chi-Squared = 36.59 using 59 PHA bins.
# Reduced chi-squared = 0.6420 for 57 degrees of freedom
# Null hypothesis probability = 9.837812e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.867e-08 3.850e-09
25- 50 5.670e-08 4.375e-09
50-150 5.818e-08 1.054e-08
15-150 1.536e-07 1.415e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.04613 (-1.50118 1.43752)
R1^2/D10^2 : 6.96618 (-3.56336 7.64282)
kT2 [keV] : 19.3568 (-5.42419 12.6261)
R2^2/D10^2 : 5.89638E-02 (-0.0493484 0.142618)
------------------------------------------------------------
# Chi-Squared = 37.83 using 59 PHA bins.
# Reduced chi-squared = 0.6878 for 55 degrees of freedom
# Null hypothesis probability = 9.626161e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.852e-08 1.012e-08
25- 50 5.570e-08 1.475e-08
50-150 6.135e-08 3.148e-08
15-150 1.556e-07 4.994e-08
Plot creation:
Sun Mar 11 17:58:51 EDT 2012