batgrbproduct Analysis for Trigger=548927
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 Feb 17 17:23:46 EST 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger548927/GCN5_download_cron
======================================================================
Trigger: 00548927 Segment: 000
BAT Trigger Time: 382745734.848 [s; MET]
Trigger Stop: 382745735.872 [s; MET]
UTC: 2013-02-16T22:15:24.622820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 67.8981836700403 Dec: 14.6647956247236 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.84
Image Trigger?: NO
Rate S/N Ratio: 59.9499791492875 [ if not an image trigger ]
Image S/N Ratio: 20.84
Flight Position: [ source = BAT ]
RA: 67.8981836700403 Dec: 14.6647956247236 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 67.9007542973678 Dec: 14.6695417988206 [deg; J2000]
{ 04h 31m 36.2s , +14d 40' 10.4" }
+/- 0.646439842787822 [arcmin] (estimated 90% radius based on SNR)
+/- 0.164330598903334 [arcmin] (formal 1-sigma fit error)
SNR: 56.7273505110147
Angular difference between Flight and Ground position is 0.321494 arcmin
Partial Coding Fraction: 0.546875 [ including projection effects ]
Duration
T90: 6.51199996471405 +/- 1.08621174877495
Measured from: -3.2639998793602
to: 3.24800008535385 [s; relative to TRIGTIME]
T50: 3.69999998807907 +/- 0.17181385542362
Measured from: -1.61999988555908
to: 2.08000010251999 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.11199998855591
to: 2.11199998855591 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.1599999666214
to: 4.30800002813339 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.944319 1.635460 1.427867 0.362038
0.029594 0.033368 0.030943 0.023320 [error]
Peak 0.125663 0.261566 0.311588 0.115984
0.009706 0.011926 0.012447 0.009133 [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 3.47e-07 6.99e-07 1.10e-06 3.80e-06 3.05e-06 5.94e-06 erg/cm2
Error 1.73e-08 2.08e-08 3.18e-08 2.48e-07 8.02e-08 2.65e-07 erg/cm2
Peak flux Power-law 1.38e+00 1.92e+00 1.98e+00 3.73e+00 6.47e+00 9.02e+00 ph/cm2/s
Error 1.31e-01 1.12e-01 9.72e-02 3.92e-01 3.05e-01 4.60e-01 ph/cm2/s
Fluence Cutoff-PL 3.02e-07 7.22e-07 1.16e-06 2.01e-06 2.97e-06 4.19e-06 erg/cm2
Error 2.21e-08 2.30e-08 3.82e-08 4.13e-07 8.61e-08 4.13e-07 erg/cm2
Peak flux Cutoff-PL 1.24e+00 1.96e+00 2.08e+00 2.58e+00 6.39e+00 7.86e+00 ph/cm2/s
Error 1.68e-01 1.21e-01 1.28e-01 7.71e-01 3.11e-01 8.20e-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 1.350 0.044 - - 2.99e-02 7.48e-04 72.980 57
CPL 0.802 0.195 123.7 27.1 5.26e-02 1.04e-02 47.170 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.957 0.079 - - 5.63e-02 2.62e-03 69.840 57
CPL 0.561 0.332 214.5 317.1 8.38e-02 2.79e-02 65.320 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: 6.016000 sec.
T50 in the 50-300 keV band: 2.688000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 10.468 -6.160 4.308
T90 6.512 -3.264 3.248
T50 3.700 -1.620 2.080
Peak 1.000 1.112 2.112
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
67.9008 +14.6695 0.0034 32.6 -48.1 4.5510 56.7 TRIG_00548927
------------------------------------------
Foreground time interval of the image:
-6.160 4.308 (delta_t = 10.468 [sec])
Background time interval of the image:
-168.547 -6.160 (delta_t = 162.387 [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 -6.160 sec. to 4.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35003 ( -0.0444043 0.0443225 )
Norm@50keV : 2.98688E-02 ( -0.000748194 0.000748093 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.98 using 59 PHA bins.
# Reduced chi-squared = 1.280 for 57 degrees of freedom
# Null hypothesis probability = 7.535956e-02
Photon flux (15-150 keV) in 10.47 sec: 3.59835 ( -0.0980735 0.0982848 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.05431e-06 ( -8.01475e-08 8.02197e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.160 sec. to 4.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.802049 ( -0.199147 0.190874 )
Epeak [keV] : 123.657 ( -18.6273 35.5043 )
Norm@50keV : 5.25637E-02 ( -0.00917034 0.0116172 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.17 using 59 PHA bins.
# Reduced chi-squared = 0.8423 for 56 degrees of freedom
# Null hypothesis probability = 7.935463e-01
Photon flux (15-150 keV) in 10.47 sec: 3.48267 ( -0.10436 0.10471 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97314e-06 ( -8.63042e-08 8.58121e-08 ) ergs/cm2
Band function
Time interval is from -6.160 sec. to 4.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.323054 ( -0.667928 0.984763 )
beta : -1.57752 ( 1.57614 0.111716 )
Epeak [keV] : 74.8919 ( -24.302 81.512 )
Norm@50keV : 0.100653 ( -0.0600395 0.335217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.90 using 59 PHA bins.
# Reduced chi-squared = 0.8527 for 55 degrees of freedom
# Null hypothesis probability = 7.732928e-01
Photon flux (15-150 keV) in 10.47 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] : 18.3032 ( )
R^2/D10^2 : 0.213430 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 273.93 using 59 PHA bins.
# Reduced chi-squared = 4.8057 for 57 degrees of freedom
# Null hypothesis probability = 4.094698e-30
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.491e-07 7.486e-09
25- 50 6.980e-07 2.288e-08
50-150 1.704e-06 7.381e-08
15-150 2.552e-06 7.643e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 15.2162 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 126.38 using 59 PHA bins.
# Reduced chi-squared = 2.2172 for 57 degrees of freedom
# Null hypothesis probability = 3.596203e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.967e-07 1.105e-08
25- 50 7.631e-07 2.031e-08
50-150 1.674e-06 4.607e-08
15-150 2.833e-06 7.329e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.74346 (-0.956858 1.02734)
R1^2/D10^2 : 1.45972 (-0.397068 0.612832)
kT2 [keV] : 29.4556 (-2.81355 3.92112)
R2^2/D10^2 : 3.30477E-02 (-0.0120687 0.0151306)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.00 using 59 PHA bins.
# Reduced chi-squared = 0.8546 for 55 degrees of freedom
# Null hypothesis probability = 7.699349e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.714e-07 2.555e-08
25- 50 7.454e-07 4.905e-08
50-150 1.953e-06 1.602e-07
15-150 2.970e-06 2.073e-07
Peak spectrum fit
Power-law model
Time interval is from 1.112 sec. to 2.112 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.956691 ( -0.0789364 0.0780959 )
Norm@50keV : 5.62920E-02 ( -0.00262157 0.00261684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.84 using 59 PHA bins.
# Reduced chi-squared = 1.225 for 57 degrees of freedom
# Null hypothesis probability = 1.182404e-01
Photon flux (15-150 keV) in 1 sec: 6.46874 ( -0.30458 0.304834 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.18317e-07 ( -3.06672e-08 3.0776e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.112 sec. to 2.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.561379 ( -0.344005 0.319351 )
Epeak [keV] : 214.533 ( -72.8295 561.336 )
Norm@50keV : 8.38205E-02 ( -0.0225978 0.0332749 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.32 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 56 degrees of freedom
# Null hypothesis probability = 1.845511e-01
Photon flux (15-150 keV) in 1 sec: 6.38729 ( -0.31137 0.31152 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.10747e-07 ( -3.1998e-08 3.1848e-08 ) ergs/cm2
Band function
Time interval is from 1.112 sec. to 2.112 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99997 ( -4.99997 -4.99997 )
beta : -1.00353 ( -0.086995 0.0865333 )
Epeak [keV] : 28.6610 ( -28.661 5.07919 )
Norm@50keV : 1651.88 ( -75.3167 8.15241e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.08 using 59 PHA bins.
# Reduced chi-squared = 1.256 for 55 degrees of freedom
# Null hypothesis probability = 9.600839e-02
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] : 22.8490 ( )
R^2/D10^2 : 0.211907 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 125.17 using 59 PHA bins.
# Reduced chi-squared = 2.1960 for 57 degrees of freedom
# Null hypothesis probability = 5.085599e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.011e-08 1.855e-09
25- 50 1.087e-07 7.300e-09
50-150 4.240e-07 2.990e-08
15-150 5.529e-07 3.205e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 25.9503 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 219.64 using 59 PHA bins.
# Reduced chi-squared = 3.8533 for 57 degrees of freedom
# Null hypothesis probability = 6.157647e-21
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.462e-08 3.150e-09
25- 50 1.243e-07 6.450e-09
50-150 2.726e-07 4.690e-08
15-150 4.615e-07 3.400e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.48495 (-2.27183 2.86376)
R1^2/D10^2 : 1.58024 (-0.751914 1.87207)
kT2 [keV] : 35.6208 (-6.05869 14.3168)
R2^2/D10^2 : 4.48869E-02 (-0.0291278 0.0390167)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.76 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 55 degrees of freedom
# Null hypothesis probability = 1.329339e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.634e-08 8.710e-09
25- 50 1.178e-07 2.592e-08
50-150 4.599e-07 1.133e-07
15-150 6.140e-07 1.331e-07
Plot creation:
Sun Feb 17 21:01:14 EST 2013