batgrbproduct Analysis for Trigger=550457
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 Mar 8 14:11:06 EST 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger550457/batgroup_hand_proc
======================================================================
Trigger: 00550457 Segment: 000
BAT Trigger Time: 384306672 [s; MET]
Trigger Stop: 384306736 [s; MET]
UTC: 2013-03-06T23:51:01.706560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 279.477639697716 Dec: -11.6917684859571 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.36
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.36
Flight Position: [ source = BAT ]
RA: 279.477639697716 Dec: -11.6917684859571 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 279.475384779709 Dec: -11.6819492803685 [deg; J2000]
{ 18h 37m 54.1s , -11d 40' 55.0" }
+/- 1.63688519685698 [arcmin] (estimated 90% radius based on SNR)
+/- 0.706898398192378 [arcmin] (formal 1-sigma fit error)
SNR: 15.0445105779524
Angular difference between Flight and Ground position is 0.603866 arcmin
Partial Coding Fraction: 0.1162109 [ including projection effects ]
Duration
T90: 280.479999899864 +/- 9.48335238101111
Measured from: -154.723999977112
to: 125.755999922752 [s; relative to TRIGTIME]
T50: 70.6879999637604 +/- 8.07857512368005
Measured from: -141.248000025749
to: -70.5600000619888 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -152.727999985218
to: -151.727999985218 [s; relative to TRIGTIME]
Total Fluence
Measured from: -159.472000002861
to: 154.079999983311 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 14.679643 17.179889 11.841163 2.042563
0.314318 0.307571 0.281901 0.276793 [error]
Peak 0.156952 0.322098 0.209548 0.071132
0.024315 0.025187 0.023467 0.019772 [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 6.49e-06 9.05e-06 9.34e-06 1.76e-05 3.05e-05 4.25e-05 erg/cm2
Error 3.15e-07 2.50e-07 3.13e-07 1.32e-06 7.68e-07 1.51e-06 erg/cm2
Peak flux Power-law 2.71e+00 2.46e+00 1.54e+00 1.48e+00 7.33e+00 8.19e+00 ph/cm2/s
Error 4.77e-01 2.68e-01 1.94e-01 3.76e-01 7.82e-01 8.18e-01 ph/cm2/s
Fluence Cutoff-PL 5.68e-06 9.28e-06 9.69e-06 9.71e-06 2.93e-05 3.44e-05 erg/cm2
Error 4.33e-07 2.73e-07 3.54e-07 2.27e-06 8.96e-07 2.50e-06 erg/cm2
Peak flux Cutoff-PL 2.52e+00 2.53e+00 1.60e+00 1.03e+00 7.20e+00 7.69e+00 ph/cm2/s
Error 5.82e-01 3.07e-01 2.28e-01 6.34e-01 8.13e-01 1.33e+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 7.69e+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 1.955 0.049 - - 1.06e-02 2.69e-04 0.000 57
CPL 1.419 0.230 58.5 6.6 1.86e-02 4.53e-03 0.000 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.674 0.174 - - 5.57e-02 5.68e-03 0.000 57
CPL 1.315 0.635 100.1 -30.6 8.34e-02 9.76e-02 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: 229.312000 sec.
T50 in the 50-300 keV band: 84.416000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 313.552 -159.472 154.080
T90 280.480 -154.724 125.756
T50 70.688 -141.248 -70.560
Peak 1.000 -152.728 -151.728
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
279.4754 -11.6819 0.0128 55.8870 -8.8621 9.7790158 15.045 TRIG_00550457
Foreground time interval of the image:
-11.299 154.080 (delta_t = 165.379 [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 -159.472 sec. to 154.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95454 ( -0.0491262 0.0495339 )
Norm@50keV : 1.05556E-02 ( -0.000269287 0.000269017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.13 using 59 PHA bins.
# Reduced chi-squared = 1.423 for 57 degrees of freedom
# Null hypothesis probability = 1.956689e-02
Photon flux (15-150 keV) in 313.6 sec: 1.55114 ( -0.0464933 0.0468051 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.04673e-05 ( -7.68354e-07 7.68593e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -159.472 sec. to 154.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41864 ( -0.235086 0.224161 )
Epeak [keV] : 58.4628 ( -5.56265 7.58119 )
Norm@50keV : 1.86301E-02 ( -0.00387439 0.00518012 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.69 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 56 degrees of freedom
# Null hypothesis probability = 2.240668e-01
Photon flux (15-150 keV) in 313.6 sec: 1.46951 ( -0.05506 0.05582 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93462e-05 ( -8.97523e-07 8.94074e-07 ) ergs/cm2
Band function
Time interval is from -159.472 sec. to 154.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41864 ( -0.180203 0.274096 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 58.4511 ( -5.47251 7.58146 )
Norm@50keV : 1.86274E-02 ( -0.00387627 0.00517503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.70 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 55 degrees of freedom
# Null hypothesis probability = 1.971531e-01
Photon flux (15-150 keV) in 313.6 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] : 13.7761 ( )
R^2/D10^2 : 0.202008 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 322.50 using 59 PHA bins.
# Reduced chi-squared = 5.6579 for 57 degrees of freedom
# Null hypothesis probability = 9.966069e-39
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.543e-06 1.245e-07
25- 50 9.307e-06 3.073e-07
50-150 1.153e-05 5.551e-07
15-150 2.338e-05 6.100e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 91.4486 (-7.44283 8.53192)
Norm : 6.69671 (-0.285009 0.30028)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.68 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.263493e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.482e-06 2.430e-07
25- 50 9.305e-06 2.650e-07
50-150 1.431e-05 7.087e-07
15-150 2.909e-05 1.115e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.70032 (-0.916957 1.06957)
R1^2/D10^2 : 3.50538 (-1.66642 4.04312)
kT2 [keV] : 19.0461 (-1.49081 2.07701)
R2^2/D10^2 : 4.74956E-02 (-0.0173518 0.0205844)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.21 using 59 PHA bins.
# Reduced chi-squared = 1.531 for 55 degrees of freedom
# Null hypothesis probability = 6.845972e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.454e-06 6.178e-07
25- 50 9.023e-06 5.504e-07
50-150 1.392e-05 7.432e-07
15-150 2.840e-05 1.499e-06
Peak spectrum fit
Power-law model
Time interval is from -152.728 sec. to -151.728 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67404 ( -0.171852 0.175561 )
Norm@50keV : 5.56765E-02 ( -0.0056953 0.00567111 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.26 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 57 degrees of freedom
# Null hypothesis probability = 4.655051e-01
Photon flux (15-150 keV) in 1 sec: 7.32867 ( -0.780157 0.783834 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.16629e-07 ( -5.48139e-08 5.50264e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -152.728 sec. to -151.728 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31504 ( -0.772009 0.498853 )
Epeak [keV] : 100.065 ( -38.8296 -100.065 )
Norm@50keV : 8.33773E-02 ( -0.0833772 0.111749 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.45 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 56 degrees of freedom
# Null hypothesis probability = 4.578637e-01
Photon flux (15-150 keV) in 1 sec: 7.20375 ( -0.81082 0.81565 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08337e-07 ( -5.8143e-08 5.7582e-08 ) ergs/cm2
Band function
Time interval is from -152.728 sec. to -151.728 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.269218 ( 0.596686 4.93883 )
beta : -1.85719 ( 1.84762 0.275191 )
Epeak [keV] : 46.2932 ( -45.8756 201.209 )
Norm@50keV : 0.376293 ( -0.417622 495.223 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.62 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 55 degrees of freedom
# Null hypothesis probability = 4.512903e-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] : 14.3153 (-1.78336 2.02712)
R^2/D10^2 : 0.947449 (-0.363149 0.590175)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.04 using 59 PHA bins.
# Reduced chi-squared = 1.404 for 57 degrees of freedom
# Null hypothesis probability = 2.376384e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.092e-08 8.240e-09
25- 50 1.556e-07 2.115e-08
50-150 2.123e-07 4.350e-08
15-150 4.087e-07 5.305e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 161.509 (-60.3852 -160.334)
Norm : 29.8352 (-3.32989 2.30533)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.47 using 59 PHA bins.
# Reduced chi-squared = 0.9907 for 57 degrees of freedom
# Null hypothesis probability = 4.948587e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.611e-08 1.826e-08
25- 50 1.426e-07 4.683e-08
50-150 2.899e-07 1.548e-07
15-150 5.085e-07 2.086e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.36900 (-1.94023 2.10555)
R1^2/D10^2 : 4.74255 (-2.45636 4.11788)
kT2 [keV] : 31.1988 (-9.30089 28.5145)
R2^2/D10^2 : 3.98637E-02 (-0.03425 0.112518)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.07 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.719719e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.791e-08 2.812e-08
25- 50 1.543e-07 5.791e-08
50-150 2.867e-07 1.420e-07
15-150 5.089e-07 1.882e-07
Plot creation:
Fri Mar 8 14:43:10 EST 2013