batgrbproduct Analysis for Trigger=548760
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): Fri Feb 15 09:46:56 EST 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger548760/GCN5_download_cron
======================================================================
Trigger: 00548760 Segment: 000
BAT Trigger Time: 382584700.416 [s; MET]
Trigger Stop: 382584716.8 [s; MET]
UTC: 2013-02-15T01:31:30.197800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 43.4794556448911 Dec: 13.3706926231607 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: NO
Rate S/N Ratio: 19.6468827043885 [ if not an image trigger ]
Image S/N Ratio: 8.16
Flight Position: [ source = BAT ]
RA: 43.4794556448911 Dec: 13.3706926231607 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 43.4862689501498 Dec: 13.3871086018421 [deg; J2000]
{ 02h 53m 56.7s , +13d 23' 13.6" }
+/- 1.48979340414527 [arcmin] (estimated 90% radius based on SNR)
+/- 0.607932542896142 [arcmin] (formal 1-sigma fit error)
SNR: 17.2105779821753
Angular difference between Flight and Ground position is 1.062220 arcmin
Partial Coding Fraction: 0.08398438 [ including projection effects ]
Duration
T90: 65.7440000772476 +/- 10.8000118319369
Measured from: -2.66399991512299
to: 63.0800001621246 [s; relative to TRIGTIME]
T50: 28.6400000452995 +/- 7.31892888315766
Measured from: 6.76000010967255
to: 35.4000001549721 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.1639999747276
to: 12.1639999747276 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.83200001716614
to: 73.3840000033379 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.760010 2.683351 2.383934 0.575057
0.187221 0.200493 0.184482 0.165419 [error]
Peak 0.049933 0.118487 0.086800 0.026547
0.022491 0.023712 0.022633 0.020141 [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 7.93e-07 1.38e-06 1.84e-06 5.02e-06 5.37e-06 9.04e-06 erg/cm2
Error 1.10e-07 1.18e-07 1.84e-07 1.07e-06 4.53e-07 1.21e-06 erg/cm2
Peak flux Power-law 8.70e-01 8.40e-01 5.66e-01 5.96e-01 2.52e+00 2.87e+00 ph/cm2/s
Error 3.93e-01 2.42e-01 1.79e-01 3.78e-01 6.96e-01 7.54e-01 ph/cm2/s
Fluence Cutoff-PL 7.24e-07 1.44e-06 1.92e-06 2.80e-06 5.25e-06 6.89e-06 erg/cm2
Error 1.33e-07 1.39e-07 2.11e-07 1.95e-06 4.76e-07 1.34e-06 erg/cm2
Peak flux Cutoff-PL 6.31e-01 9.19e-01 6.50e-01 2.13e-01 2.36e+00 2.41e+00 ph/cm2/s
Error 4.94e-01 2.94e-01 2.32e-01 4.20e-01 7.39e-01 1.03e+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 2.50e+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 1.586 0.135 - - 7.23e-03 5.79e-04 0.000 57
CPL 1.126 0.545 100.5 -34.8 1.21e-02 7.82e-03 0.000 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.570 0.442 - - 1.98e-02 5.24e-03 0.000 57
CPL 0.162 2.978 69.9 0.0 9.15e-02 0.00e+00 0.000 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: 40.576000 sec.
T50 in the 50-300 keV band: 18.304000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 79.216 -5.832 73.384
T90 65.744 -2.664 63.080
T50 28.640 6.760 35.400
Peak 1.000 11.164 12.164
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
43.4863 +13.3871 0.0112 53.9 -31.6 8.0896 17.2 TRIG_00548760
------------------------------------------
Foreground time interval of the image:
-5.832 73.384 (delta_t = 79.216 [sec])
Background time interval of the image:
-239.416 -5.832 (delta_t = 233.584 [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 -5.832 sec. to 73.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58588 ( -0.134746 0.135992 )
Norm@50keV : 7.23038E-03 ( -0.000579619 0.000577703 )
------------------------------------------------------------
#Test statistic : Chi-Squared = 63.78 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 57 degrees of freedom
# Null hypothesis probability = 2.503578e-01
Photon flux (15-150 keV) in 79.22 sec: 0.925121 ( -0.0776224 0.0778817 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.36623e-06 ( -4.51819e-07 4.53331e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.832 sec. to 73.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12589 ( -0.582353 0.507486 )
Epeak [keV] : 100.475 ( -30.9226 -100.475 )
Norm@50keV : 1.20710E-02 ( -0.00505327 0.0105866 )
------------------------------------------------------------
#Test statistic : Chi-Squared = 61.49 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 56 degrees of freedom
# Null hypothesis probability = 2.858402e-01
Photon flux (15-150 keV) in 79.22 sec: 0.905386 ( -0.080511 0.080778 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.25195e-06 ( -4.77142e-07 4.75241e-07 ) ergs/cm2
Band function
Time interval is from -5.832 sec. to 73.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12589 ( -0.418607 0.602275 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 100.459 ( -25.4879 -100.459 )
Norm@50keV : 1.20697E-02 ( -0.00505366 0.0105909 )
------------------------------------------------------------
#Test statistic : Chi-Squared = 61.49 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Null hypothesis probability = 2.548372e-01
Photon flux (15-150 keV) in 79.22 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] : 15.5649 (-1.50751 1.68109)
R^2/D10^2 : 9.07011E-02 (-0.0279648 0.0400949)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Test statistic : Chi-Squared = 96.95 using 59 PHA bins.
# Reduced chi-squared = 1.701 for 57 degrees of freedom
# Null hypothesis probability = 7.621597e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.620e-07 5.232e-08
25- 50 1.487e-06 1.699e-07
50-150 2.491e-06 3.319e-07
15-150 4.340e-06 4.175e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 192.037 ( )
Norm : 3.77076 (-0.307594 0.356165)
------------------------------------------------------------
#Test statistic : Chi-Squared = 61.67 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.128596e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.424e-07 9.197e-08
25- 50 1.428e-06 2.800e-07
50-150 3.127e-06 1.490e-06
15-150 5.297e-06 1.487e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.17195 (-1.57201 1.84588)
R1^2/D10^2 : 0.894190 (-0.477896 1.26642)
kT2 [keV] : 25.7882 (-4.83665 8.49501)
R2^2/D10^2 : 1.16138E-02 (-0.00750017 0.0142609)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.47 using 59 PHA bins.
#Test statistic : Chi-Squared = 59.47 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 55 degrees of freedom
# Null hypothesis probability = 3.161093e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.044e-07 2.901e-07
25- 50 1.463e-06 4.400e-07
50-150 3.111e-06 1.494e-06
15-150 5.278e-06 1.864e-06
Peak spectrum fit
Power-law model
Time interval is from 11.164 sec. to 12.164 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57021 ( -0.431847 0.451651 )
Norm@50keV : 1.97727E-02 ( -0.0052584 0.00523147 )
------------------------------------------------------------
#Test statistic : Chi-Squared = 64.82 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 57 degrees of freedom
# Null hypothesis probability = 2.225542e-01
Photon flux (15-150 keV) in 1 sec: 2.51804 ( -0.692425 0.69984 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85622e-07 ( -5.14832e-08 5.20309e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.164 sec. to 12.164 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.162354 ( -4.02871 1.9282 )
Epeak [keV] : 69.8600 ( )
Norm@50keV : 9.15222E-02 ( )
------------------------------------------------------------
#Test statistic : Chi-Squared = 63.57 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 56 degrees of freedom
# Null hypothesis probability = 2.273652e-01
Photon flux (15-150 keV) in 1 sec: 2.35908 ( -0.73729 0.74154 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75444e-07 ( -5.5574e-08 5.5442e-08 ) ergs/cm2
Band function
Time interval is from 11.164 sec. to 12.164 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.156776 ( -1.44902 5.28538 )
beta : -10.00000 ( 10 2.09602e-07 )
Epeak [keV] : 69.7831 ( -23.0066 -69.7831 )
Norm@50keV : 9.20910E-02 ( -0.092091 6.94417 )
------------------------------------------------------------
#Test statistic : Chi-Squared = 63.57 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 55 degrees of freedom
# Null hypothesis probability = 2.002333e-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] : 15.5017 (-3.68266 5.11752)
R^2/D10^2 : 0.265546 (-0.172001 0.429905)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Test statistic : Chi-Squared = 64.34 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 57 degrees of freedom
# Null hypothesis probability = 2.350855e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.328e-08 6.826e-09
25- 50 5.437e-08 2.400e-08
50-150 9.017e-08 5.149e-08
15-150 1.578e-07 8.377e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 192.996 (-120.383 -190.234)
Norm : 10.3866 (-2.72967 3.75594)
------------------------------------------------------------
#Test statistic : Chi-Squared = 64.26 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 57 degrees of freedom
# Null hypothesis probability = 2.374080e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.597e-08 1.596e-08
25- 50 4.977e-08 2.926e-08
50-150 1.080e-07 6.225e-08
15-150 1.837e-07 1.054e-07
Double BB
kT1 [keV] : 1.28367 (-1.71103 16.4491)
R1^2/D10^2 : 8.46524E+04 ( )
kT2 [keV] : 16.1729 (-3.93985 5.78495)
R2^2/D10^2 : 0.222793 (-0.170411 0.20236)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.53 using 59 PHA bins.
#Test statistic : Chi-Squared = 62.53 using 59 PHA bins.
#Fit statistic : Chi-Squared = 62.37 using 59 PHA bins.
#Test statistic : Chi-Squared = 62.37 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 55 degrees of freedom
# Reduced chi-squared = 1.134 for 55 degrees of freedom
# Null hypothesis probability = 2.264255e-01
# Null hypothesis probability = 2.306006e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.175e-08 9.109e-09
25- 50 5.029e-08 2.674e-08
50-150 9.463e-08 6.180e-08
15-150 1.667e-07 9.136e-08
Plot creation:
Fri Feb 15 10:02:20 EST 2013