batgrbproduct Analysis for Trigger=548276
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): Mon Feb 11 09:56:08 EST 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger548276/GCN5_download_cron
======================================================================
Trigger: 00548276 Segment: 000
BAT Trigger Time: 382246602.368 [s; MET]
Trigger Stop: 382246610.56 [s; MET]
UTC: 2013-02-11T03:36:32.164500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 147.522617639919 Dec: -42.3387481449984 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.01
Image Trigger?: NO
Rate S/N Ratio: 9.38083151964686 [ if not an image trigger ]
Image S/N Ratio: 7.01
Flight Position: [ source = BAT ]
RA: 147.522617639919 Dec: -42.3387481449984 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 147.52006246266 Dec: -42.3301798300395 [deg; J2000]
{ 09h 50m 04.8s , -42d 19' 48.6" }
+/- 2.12504366809846 [arcmin] (estimated 90% radius based on SNR)
+/- 0.872638146326584 [arcmin] (formal 1-sigma fit error)
SNR: 10.3621532299256
Angular difference between Flight and Ground position is 0.526442 arcmin
Partial Coding Fraction: 0.40625 [ including projection effects ]
Duration
T90: 24.91999989748 +/- 6.40130267546355
Measured from: -1.03199982643127
to: 23.8880000710487 [s; relative to TRIGTIME]
T50: 9.8999999165535 +/- 6.75811128849419
Measured from: 3.46400016546249
to: 13.364000082016 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -1.5799999833107
to: -0.579999983310699 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.7039999961853
to: 31.5240000486374 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.372112 0.446277 0.232749 0.012970
0.051253 0.051165 0.043488 0.037053 [error]
Peak 0.022345 0.035560 0.023744 0.006521
0.008798 0.008815 0.007935 0.006378 [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 1.19e-07 1.84e-07 2.14e-07 4.79e-07 6.58e-07 9.96e-07 erg/cm2
Error 2.42e-08 2.46e-08 4.30e-08 1.97e-07 1.01e-07 2.38e-07 erg/cm2
Peak flux Power-law 2.58e-01 2.52e-01 1.72e-01 1.83e-01 7.56e-01 8.66e-01 ph/cm2/s
Error 1.19e-01 7.63e-02 6.25e-02 1.32e-01 2.21e-01 2.51e-01 ph/cm2/s
Fluence Cutoff-PL 1.15e-07 1.91e-07 2.15e-07 2.90e-07 6.41e-07 8.11e-07 erg/cm2
Error 2.64e-08 3.10e-08 4.52e-08 3.27e-07 1.11e-07 3.31e-07 erg/cm2
Peak flux Cutoff-PL 1.99e-01 2.80e-01 1.94e-01 6.43e-02 7.21e-01 7.38e-01 ph/cm2/s
Error 1.44e-01 9.50e-02 7.75e-02 9.00e-02 2.30e-01 2.77e-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 2.21e-01 7.70e-01 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 1.781 0.238 - - 2.15e-03 3.21e-04 0.000 57
CPL 1.486 0.889 78.7 0.0 3.12e-03 0.00e+00 0.000 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.554 0.479 - - 5.96e-03 1.78e-03 0.000 57
CPL 0.240 2.673 69.3 -21.9 2.63e-02 8.31e-01 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 33.228 -1.704 31.524
T90 24.920 -1.032 23.888
T50 9.900 3.464 13.364
Peak 1.000 -1.580 -0.580
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
147.5201 -42.3302 0.0185 34.1 39.1 1.0820 10.4 TRIG_00548276
------------------------------------------
Foreground time interval of the image:
-1.704 31.524 (delta_t = 33.228 [sec])
Background time interval of the image:
-239.368 -1.704 (delta_t = 237.664 [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 -1.704 sec. to 31.524 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78137 ( -0.233106 0.241957 )
Norm@50keV : 2.14821E-03 ( -0.000324289 0.00031746 )
------------------------------------------------------------
#Test statistic : Chi-Squared = 62.67 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 57 degrees of freedom
# Null hypothesis probability = 2.820841e-01
Photon flux (15-150 keV) in 33.23 sec: 0.293908 ( -0.0396041 0.0396426 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.57658e-07 ( -1.00378e-07 1.02054e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.704 sec. to 31.524 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48602 ( -0.979684 0.798602 )
Epeak [keV] : 78.7446 ( )
Norm@50keV : 3.12444E-03 ( )
------------------------------------------------------------
#Test statistic : Chi-Squared = 62.29 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 56 degrees of freedom
# Null hypothesis probability = 2.623255e-01
Photon flux (15-150 keV) in 33.23 sec: 0.290787 ( -0.040521 0.040498 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.40784e-07 ( -1.11271e-07 1.11643e-07 ) ergs/cm2
Band function
Time interval is from -1.704 sec. to 31.524 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48566 ( -4.18918 0.974673 )
beta : -9.37106 ( 9.37155 19.3716 )
Epeak [keV] : 78.6971 ( -40.7751 -78.6971 )
Norm@50keV : 3.12525E-03 ( -0.00125764 0.0040498 )
------------------------------------------------------------
#Test statistic : Chi-Squared = 62.29 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 55 degrees of freedom
# Null hypothesis probability = 2.327721e-01
Photon flux (15-150 keV) in 33.23 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] : 11.0678 (-1.79513 2.30195)
R^2/D10^2 : 9.42859E-02 (-0.0476845 0.0894158)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Test statistic : Chi-Squared = 77.01 using 59 PHA bins.
# Reduced chi-squared = 1.351 for 57 degrees of freedom
# Null hypothesis probability = 3.992255e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.029e-08 2.057e-08
25- 50 2.288e-07 4.832e-08
50-150 1.591e-07 4.976e-08
15-150 4.682e-07 9.005e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 105.245 (-40.5801 -105.224)
Norm : 1.28492 (-0.219628 0.285318)
------------------------------------------------------------
#Test statistic : Chi-Squared = 62.40 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 57 degrees of freedom
# Null hypothesis probability = 2.901627e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.116e-07 2.075e-08
25- 50 1.949e-07 3.702e-08
50-150 3.249e-07 1.669e-07
15-150 6.314e-07 2.009e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.63538 (-2.15594 2.26245)
R1^2/D10^2 : 0.453667 (-0.229675 0.850731)
kT2 [keV] : 25.1664 (-10.0047 29.4773)
R2^2/D10^2 : 3.05620E-03 (-0.00193816 0.00915453)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.27 using 59 PHA bins.
#Test statistic : Chi-Squared = 61.27 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 55 degrees of freedom
# Null hypothesis probability = 2.611492e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.117e-07 6.511e-08
25- 50 1.872e-07 1.055e-07
50-150 3.142e-07 1.929e-07
15-150 6.131e-07 3.379e-07
Peak spectrum fit
Power-law model
Time interval is from -1.580 sec. to -0.580 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55395 ( -0.465553 0.491961 )
Norm@50keV : 5.96395E-03 ( -0.00179201 0.00176092 )
------------------------------------------------------------
#Test statistic : Chi-Squared = 69.77 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 57 degrees of freedom
# Null hypothesis probability = 1.193866e-01
Photon flux (15-150 keV) in 1 sec: 0.755869 ( -0.220866 0.221701 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61128e-08 ( -1.76789e-08 1.80749e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.580 sec. to -0.580 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.240476 ( -3.68349 1.66214 )
Epeak [keV] : 69.2722 ( -25.4659 -69.2731 )
Norm@50keV : 2.63071E-02 ( -0.0263063 1.63568 )
------------------------------------------------------------
#Test statistic : Chi-Squared = 68.51 using 59 PHA bins.
# Reduced chi-squared = 1.223 for 56 degrees of freedom
# Null hypothesis probability = 1.217378e-01
Photon flux (15-150 keV) in 1 sec: 0.721216 ( -0.231057 0.229782 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.30549e-08 ( -1.80397e-08 1.87784e-08 ) ergs/cm2
Band function
Time interval is from -1.580 sec. to -0.580 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.240211 ( -0.971361 0.91724 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 69.2403 ( -25.5369 248.47 )
Norm@50keV : 2.63246E-02 ( -0.0263246 1.64741 )
------------------------------------------------------------
#Test statistic : Chi-Squared = 68.51 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 55 degrees of freedom
# Null hypothesis probability = 1.041248e-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] : 15.2010 (-4.17468 6.05901)
R^2/D10^2 : 8.58533E-02 (-0.0858426 0.180541)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Test statistic : Chi-Squared = 69.48 using 59 PHA bins.
# Reduced chi-squared = 1.219 for 57 degrees of freedom
# Null hypothesis probability = 1.241551e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.144e-09 2.448e-09
25- 50 1.667e-08 8.866e-09
50-150 2.637e-08 1.776e-08
15-150 4.718e-08 2.882e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 185.595 (-121.738 -185.13)
Norm : 3.12768 (-0.899797 1.19647)
------------------------------------------------------------
#Test statistic : Chi-Squared = 69.19 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.290277e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.859e-09 4.750e-09
25- 50 1.499e-08 8.660e-09
50-150 3.208e-08 1.886e-08
15-150 5.493e-08 3.253e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.64694 (-2.61984 22.093)
R1^2/D10^2 : 41.8919 (-50.2792 -50.2792)
kT2 [keV] : 16.8273 (-4.94303 -16.8369)
R2^2/D10^2 : 5.66825E-02 (-0.0575726 0.14102)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.75 using 59 PHA bins.
#Test statistic : Chi-Squared = 67.75 using 59 PHA bins.
# Reduced chi-squared = 1.232 for 55 degrees of freedom
# Null hypothesis probability = 1.160640e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.723e-09 5.185e-09
25- 50 1.470e-08 8.930e-09
50-150 2.899e-08 1.924e-08
15-150 5.041e-08 2.967e-08
Plot creation:
Mon Feb 11 10:24:25 EST 2013