batgrbproduct Analysis for Trigger=554620
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 Apr 27 19:24:40 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger554620/batgroup_hand_proc
======================================================================
Trigger: 00554620 Segment: 000
BAT Trigger Time: 388741688 [s; MET]
Trigger Stop: 388741752 [s; MET]
UTC: 2013-04-27T07:47:57.511640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 173.138779355743 Dec: 27.6915539178619 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 23.81
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 23.81
Flight Position: [ source = BAT ]
RA: 173.138779355743 Dec: 27.6915539178619 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 173.149455699739 Dec: 27.7059053122466 [deg; J2000]
{ 11h 32m 35.9s , +27d 42' 21.3" }
+/- 0.976986144799111 [arcmin] (estimated 90% radius based on SNR)
+/- 0.246271051853577 [arcmin] (formal 1-sigma fit error)
SNR: 31.4458628557863
Angular difference between Flight and Ground position is 1.031092 arcmin
Partial Coding Fraction: 0.140625 [ including projection effects ]
Duration
T90: 241.071999907494 +/- 4.67643795986048
Measured from: -47.0199999809265
to: 194.051999926567 [s; relative to TRIGTIME]
T50: 21.3599999547005 +/- 0.512390440098417
Measured from: -43.7639999985695
to: -22.404000043869 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -43.4279999732971
to: -42.4279999732971 [s; relative to TRIGTIME]
Total Fluence
Measured from: -51.1520000100136
to: 660.051999986172 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 115.303098 171.799536 169.690811 56.613231
0.364352 0.425026 0.433717 0.335239 [error]
Peak 5.982205 13.258145 18.524547 7.650508
0.071113 0.105660 0.130893 0.109425 [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 3.71e-05 7.81e-05 1.29e-04 4.79e-04 3.55e-04 7.22e-04 erg/cm2
Error 9.57e-07 1.25e-06 1.25e-06 9.94e-06 3.56e-06 9.81e-06 erg/cm2
Peak flux Power-law 6.50e+01 9.96e+01 1.14e+02 2.52e+02 3.54e+02 5.31e+02 ph/cm2/s
Error 2.01e+00 1.92e+00 1.45e+00 6.75e+00 4.95e+00 7.25e+00 ph/cm2/s
Fluence Cutoff-PL 3.49e-05 7.77e-05 1.31e-04 4.24e-04 3.54e-04 6.68e-04 erg/cm2
Error 1.44e-06 1.29e-06 1.85e-06 2.61e-05 3.56e-06 2.61e-05 erg/cm2
Peak flux Cutoff-PL 5.49e+01 9.88e+01 1.22e+02 1.83e+02 3.48e+02 4.59e+02 ph/cm2/s
Error 2.81e+00 2.01e+00 2.18e+00 1.28e+01 5.04e+00 1.40e+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 1.281 0.018 - - 5.02e-02 6.03e-04 28.910 57
CPL 1.128 0.078 410.8 222.3 5.67e-02 3.47e-03 17.670 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 0.800 0.023 - - 3.08e+00 4.42e-02 108.710 57
CPL 0.352 0.104 249.8 43.6 4.51e+00 3.93e-01 51.060 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: 161.280000 sec.
T50 in the 50-300 keV band: 5.120000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 711.204 -51.152 660.052
T90 241.072 -47.020 194.052
T50 21.360 -43.764 -22.404
Peak 1.000 -43.428 -42.428
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
173.1495 27.7059 0.0062 39.1065 -76.1606 32.3855454 31.446 TRIG_00554620
Foreground time interval of the image:
-16.099 72.301 (delta_t = 88.400 [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
Time interval is from -51.152 sec. to 660.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28095 ( -0.0180539 0.0179655 )
Norm@50keV : 5.02100E-02 ( -0.000604176 0.000602666 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 28.91 using 59 PHA bins.
# Reduced chi-squared = 0.5072 for 57 degrees of freedom
# Null hypothesis probability = 9.992911e-01
Photon flux (15-150 keV) in 711.2 sec: 5.96967 ( -0.0841247 0.0844212 ) ph/cm2/s
Energy fluence (15-150 keV) : 0.000354542 ( -3.56027e-06 3.56035e-06 ) ergs/cm2
Cutoff power-law model
Time interval is from -51.152 sec. to 660.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12819 ( -0.0787594 0.0776682 )
Epeak [keV] : 410.800 ( -113.326 331.249 )
Norm@50keV : 5.66897E-02 ( -0.00335003 0.00359056 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 17.67 using 59 PHA bins.
# Reduced chi-squared = 0.3156 for 56 degrees of freedom
# Null hypothesis probability = 9.999998e-01
Photon flux (15-150 keV) in 711.2 sec: 5.87716 ( -0.09421 0.09491 ) ph/cm2/s
Energy fluence (15-150 keV) : 0.000354254 ( -3.56027e-06 3.56169e-06 ) ergs/cm2
Band function
Time interval is from -51.152 sec. to 660.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12818 ( -0.0247314 0.0232411 )
beta : -9.97030 ( 9.8166 19.8166 )
Epeak [keV] : 410.731 ( -48.5668 331.098 )
Norm@50keV : 5.66836E-02 ( -0.000550503 0.00281625 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 17.67 using 59 PHA bins.
# Reduced chi-squared = 0.3213 for 55 degrees of freedom
# Null hypothesis probability = 9.999996e-01
Photon flux (15-150 keV) in 711.2 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] : 25.6510 ( )
R^2/D10^2 : 0.116098 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1809.38 using 59 PHA bins.
# Reduced chi-squared = 31.7435 for 57 degrees of freedom
# Null hypothesis probability = 0.000000e+00
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.308e-06 2.169e-07
25- 50 5.350e-05 9.743e-07
50-150 2.599e-04 2.916e-06
15-150 3.227e-04 3.129e-06
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 28.1101 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1310.07 using 59 PHA bins.
# Reduced chi-squared = 22.9838 for 57 degrees of freedom
# Null hypothesis probability = 1.690921e-236
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.978e-05 6.152e-07
25- 50 9.576e-05 1.245e-06
50-150 2.100e-04 2.738e-06
15-150 3.556e-04 4.587e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.48990 (-0.436348 0.452874)
R1^2/D10^2 : 1.85065 (-0.263305 0.318267)
kT2 [keV] : 36.9071 (-1.26304 1.43292)
R2^2/D10^2 : 2.89237E-02 (-0.00361227 0.00380004)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.31 using 59 PHA bins.
# Reduced chi-squared = 0.9148 for 55 degrees of freedom
# Null hypothesis probability = 6.539484e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.749e-05 1.255e-06
25- 50 7.999e-05 1.814e-06
50-150 2.439e-04 3.236e-06
15-150 3.514e-04 4.374e-06
Peak spectrum fit
Power-law model
Time interval is from -43.428 sec. to -42.428 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.799968 ( -0.0227391 0.0226336 )
Norm@50keV : 3.07660 ( -0.0442462 0.0441406 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 108.71 using 59 PHA bins.
# Reduced chi-squared = 1.9071 for 57 degrees of freedom
# Null hypothesis probability = 4.433845e-05
Photon flux (15-150 keV) in 1 sec: 353.600 ( -4.94724 4.95103 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.59532e-05 ( -4.63605e-07 4.63573e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -43.428 sec. to -42.428 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.351654 ( -0.105397 0.10332 )
Epeak [keV] : 249.795 ( -34.2419 53.0077 )
Norm@50keV : 4.51279 ( -0.37342 0.413362 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.06 using 59 PHA bins.
# Reduced chi-squared = 0.9119 for 56 degrees of freedom
# Null hypothesis probability = 6.617856e-01
Photon flux (15-150 keV) in 1 sec: 347.931 ( -5.027 5.046 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.60154e-05 ( 0 0 ) ergs/cm2
Band function
Time interval is from -43.428 sec. to -42.428 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.813058 ( 0.813058 0.813058 )
beta : -0.799968 ( -0.0226325 0.0227404 )
Epeak [keV] : 15.7520 ( -15.752 -15.752 )
Norm@50keV : 4.45467 ( -1.41984 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 108.71 using 59 PHA bins.
# Reduced chi-squared = 1.9765 for 55 degrees of freedom
# Null hypothesis probability = 2.169676e-05
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] : 28.1988 ( )
R^2/D10^2 : 6.50774 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 570.96 using 59 PHA bins.
# Reduced chi-squared = 10.017 for 57 degrees of freedom
# Null hypothesis probability = 6.770722e-86
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.403e-07 2.315e-08
25- 50 5.048e-06 1.055e-07
50-150 2.897e-05 4.750e-07
15-150 3.486e-05 5.000e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 1492.38 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 3227.69 using 59 PHA bins.
# Reduced chi-squared = 56.6262 for 57 degrees of freedom
# Null hypothesis probability = 0.000000e+00
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.716e-06 5.400e-08
25- 50 7.149e-06 9.450e-08
50-150 1.568e-05 2.150e-07
15-150 2.654e-05 3.900e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.5774 (-1.06484 1.14901)
R1^2/D10^2 : 40.3438 (-7.99115 11.0617)
kT2 [keV] : 42.5048 (-2.91722 3.93953)
R2^2/D10^2 : 1.62919 (-0.395156 0.417986)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.07 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 55 degrees of freedom
# Null hypothesis probability = 3.629112e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.503e-06 8.050e-08
25- 50 5.957e-06 1.850e-07
50-150 2.862e-05 8.750e-07
15-150 3.608e-05 1.080e-06
Plot creation:
Mon May 20 16:39:08 EDT 2013