batgrbproduct Analysis for Trigger=553977
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 20 18:56:17 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger553977/GCN5_download_cron
======================================================================
Trigger: 00553977 Segment: 000
BAT Trigger Time: 388135720 [s; MET]
Trigger Stop: 388135784 [s; MET]
UTC: 2013-04-20T07:28:29.538420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 196.099811619603 Dec: 59.4236969469464 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.77
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.77
Flight Position: [ source = BAT ]
RA: 196.099811619603 Dec: 59.4236969469464 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 196.120153062262 Dec: 59.4220828110946 [deg; J2000]
{ 13h 04m 28.8s , +59d 25' 19.5" }
+/- 0.618331522279855 [arcmin] (estimated 90% radius based on SNR)
+/- 0.187343589833511 [arcmin] (formal 1-sigma fit error)
SNR: 60.446831521145
Angular difference between Flight and Ground position is 0.628367 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 121.12399995327 +/- 11.7367307263019
Measured from: 37.3280001282692
to: 158.452000081539 [s; relative to TRIGTIME]
T50: 27.0319999456406 +/- 2.07638632578738
Measured from: 99.4360001087189
to: 126.468000054359 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 110.667999982834
to: 111.667999982834 [s; relative to TRIGTIME]
Total Fluence
Measured from: -14.9879999756813
to: 188.128000020981 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.354855 5.805814 2.557744 0.381191
0.089882 0.092675 0.079992 0.068840 [error]
Peak 0.124165 0.165979 0.092327 0.012802
0.008028 0.008646 0.006986 0.005313 [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 1.97e-06 2.39e-06 2.11e-06 3.19e-06 7.58e-06 9.66e-06 erg/cm2
Error 9.03e-08 6.30e-08 8.39e-08 2.72e-07 1.98e-07 3.40e-07 erg/cm2
Peak flux Power-law 1.36e+00 1.15e+00 6.65e-01 5.72e-01 3.43e+00 3.75e+00 ph/cm2/s
Error 1.33e-01 7.31e-02 5.79e-02 9.67e-02 2.18e-01 2.33e-01 ph/cm2/s
Fluence Cutoff-PL 1.75e-06 2.51e-06 2.09e-06 1.29e-06 7.12e-06 7.64e-06 erg/cm2
Error 1.14e-07 7.54e-08 9.25e-08 3.88e-07 2.53e-07 4.80e-07 erg/cm2
Peak flux Cutoff-PL 1.23e+00 1.25e+00 6.85e-01 2.43e-01 3.33e+00 3.41e+00 ph/cm2/s
Error 1.53e-01 9.54e-02 6.52e-02 1.26e-01 2.25e-01 2.56e-01 ph/cm2/s
Fluence Band 8.25e-06 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 1.16e+00 1.31e+00 6.42e-01 4.18e-01 3.32e+00 3.54e+00 ph/cm2/s
Error 1.70e-01 1.10e-01 6.31e-02 9.18e-02 2.25e-01 2.52e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.183 0.053 - - 3.98e-03 1.13e-04 65.900 57
CPL 1.518 0.251 33.4 6.6 8.85e-03 2.69e-03 41.760 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.793 0.107 - - 2.49e-02 1.70e-03 61.360 57
CPL 1.030 0.486 58.0 15.6 6.48e-02 4.29e-02 52.650 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: 120.000000 sec.
T50 in the 50-300 keV band: 21.248000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 203.116 -14.988 188.128
T90 121.124 37.328 158.452
T50 27.032 99.436 126.468
Peak 1.000 110.668 111.668
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
196.1202 +59.4221 0.0032 28.6 -19.1 15.1388 60.4 TRIG_00553977
------------------------------------------
Foreground time interval of the image:
-14.988 188.128 (delta_t = 203.116 [sec])
Background time interval of the image:
-239.000 -174.620 (delta_t = 64.380 [sec])
-174.000 -14.988 (delta_t = 159.012 [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 -14.988 sec. to 188.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.18323 ( -0.052891 0.0533573 )
Norm@50keV : 3.98106E-03 ( -0.000113478 0.000113039 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.90 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.962340e-01
Photon flux (15-150 keV) in 203.1 sec: 0.653323 ( -0.0193523 0.01946 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.58465e-06 ( -1.98034e-07 1.98207e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.988 sec. to 188.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51754 ( -0.25866 0.242973 )
Epeak [keV] : 33.3863 ( -8.33086 4.94237 )
Norm@50keV : 8.84503E-03 ( -0.00219989 0.00318403 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.76 using 59 PHA bins.
# Reduced chi-squared = 0.7456 for 56 degrees of freedom
# Null hypothesis probability = 9.216515e-01
Photon flux (15-150 keV) in 203.1 sec: 0.616737 ( -0.022663 0.022835 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.11725e-06 ( -2.52108e-07 2.53286e-07 ) ergs/cm2
Band function
Time interval is from -14.988 sec. to 188.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.972227 ( -0.537264 0.899748 )
beta : -2.50792 ( -0.295794 0.15846 )
Epeak [keV] : 34.0788 ( -3.55743 3.46755 )
Norm@50keV : 1.91554E-02 ( -0.0102016 0.0560688 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.52 using 59 PHA bins.
# Reduced chi-squared = 0.6639 for 55 degrees of freedom
# Null hypothesis probability = 9.741228e-01
Photon flux (15-150 keV) in 203.1 sec: 0.589171 ( 6.41083 -0.023844 ) 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] : 10.7273 ( )
R^2/D10^2 : 0.206116 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 256.03 using 59 PHA bins.
# Reduced chi-squared = 4.4917 for 57 degrees of freedom
# Null hypothesis probability = 5.002579e-27
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.001e-06 4.885e-08
25- 50 2.740e-06 7.413e-08
50-150 1.746e-06 1.027e-07
15-150 5.487e-06 1.564e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 57.5409 (-4.30024 4.61012)
Norm : 3.32332 (-0.173931 0.17872)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.94 using 59 PHA bins.
# Reduced chi-squared = 0.7533 for 57 degrees of freedom
# Null hypothesis probability = 9.162256e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.684e-06 7.393e-08
25- 50 2.530e-06 7.312e-08
50-150 2.779e-06 1.574e-07
15-150 6.994e-06 1.990e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.86544 (-0.66957 0.649734)
R1^2/D10^2 : 0.889255 (-0.235876 0.384854)
kT2 [keV] : 20.6646 (-2.6291 3.56936)
R2^2/D10^2 : 9.68366E-03 (-0.00470619 0.00799008)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.54 using 59 PHA bins.
# Reduced chi-squared = 0.8644 for 55 degrees of freedom
# Null hypothesis probability = 7.522602e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.499e-06 1.243e-07
25- 50 2.579e-06 1.493e-07
50-150 2.856e-06 4.011e-07
15-150 6.935e-06 5.768e-07
Peak spectrum fit
Power-law model
Time interval is from 110.668 sec. to 111.668 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79291 ( -0.105762 0.107643 )
Norm@50keV : 2.49407E-02 ( -0.00170184 0.00168891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.36 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 57 degrees of freedom
# Null hypothesis probability = 3.224264e-01
Photon flux (15-150 keV) in 1 sec: 3.42738 ( -0.217697 0.217895 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29667e-07 ( -1.59618e-08 1.60579e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 110.668 sec. to 111.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03014 ( -0.514622 0.456964 )
Epeak [keV] : 58.0407 ( -9.06678 22.1344 )
Norm@50keV : 6.47773E-02 ( -0.0277723 0.0579756 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.65 using 59 PHA bins.
# Reduced chi-squared = 0.9402 for 56 degrees of freedom
# Null hypothesis probability = 6.024004e-01
Photon flux (15-150 keV) in 1 sec: 3.33324 ( -0.22455 0.22463 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16548e-07 ( -1.7603e-08 1.7787e-08 ) ergs/cm2
Band function
Time interval is from 110.668 sec. to 111.668 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.191328 ( -1.27283 -0.203741 )
beta : -2.10577 ( -0.638015 0.214684 )
Epeak [keV] : 38.1747 ( -10.4978 19.9673 )
Norm@50keV : 0.441603 ( -0.475773 703.346 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.85 using 59 PHA bins.
# Reduced chi-squared = 0.9063 for 55 degrees of freedom
# Null hypothesis probability = 6.713049e-01
Photon flux (15-150 keV) in 1 sec: 3.32302 ( 3.67698 -0.22488 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20283e-07 ( -2.20276e-07 -1.663e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.7982 (-0.847466 0.92457)
R^2/D10^2 : 0.891802 (-0.221108 0.288998)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.51 using 59 PHA bins.
# Reduced chi-squared = 1.676 for 57 degrees of freedom
# Null hypothesis probability = 1.055567e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.621e-08 2.880e-09
25- 50 8.086e-08 5.835e-09
50-150 6.690e-08 9.030e-09
15-150 1.740e-07 1.315e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9335 (-19.5201 29.136)
Norm : 15.2505 (-1.32097 1.44665)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.39 using 59 PHA bins.
# Reduced chi-squared = 0.9367 for 57 degrees of freedom
# Null hypothesis probability = 6.112957e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.986e-08 4.260e-09
25- 50 6.892e-08 5.245e-09
50-150 1.116e-07 3.318e-08
15-150 2.204e-07 3.645e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.33019 ( )
R1^2/D10^2 : 3.58540 (-1.43161 2.92114)
kT2 [keV] : 23.4176 (-4.89085 9.01561)
R2^2/D10^2 : 4.53151E-02 (-0.0321112 0.0741351)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.48 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.19 using 59 PHA bins.
# Reduced chi-squared = 0.9541 for 55 degrees of freedom
# Reduced chi-squared = 0.8943 for 55 degrees of freedom
# Null hypothesis probability = 5.715886e-01
# Null hypothesis probability = 6.953489e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.635e-08 1.766e-08
25- 50 6.831e-08 3.103e-08
50-150 9.645e-08 5.124e-08
15-150 2.011e-07 8.759e-08
Plot creation:
Sat Apr 20 19:13:24 EDT 2013