batgrbproduct Analysis for Trigger=552677
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): Tue Apr 2 23:23:38 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger552677/GCN5_download_cron
======================================================================
Trigger: 00552677 Segment: 000
BAT Trigger Time: 386596600 [s; MET]
Trigger Stop: 386597592 [s; MET]
UTC: 2013-04-02T11:56:29.606260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 250.423654349211 Dec: -45.5609368436553 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.39
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.39
Flight Position: [ source = BAT ]
RA: 250.423654349211 Dec: -45.5609368436553 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 250.466087560093 Dec: -45.5661044482152 [deg; J2000]
{ 16h 41m 51.9s , -45d 33' 58.0" }
+/- 6.48473004496102 [arcmin] (estimated 90% radius based on SNR)
+/- 5.07244074037637 [arcmin] (formal 1-sigma fit error)
SNR: 2.10510036501593
Angular difference between Flight and Ground position is 1.809261 arcmin
Partial Coding Fraction: 0.7109375 [ including projection effects ]
Duration
T90: 992 +/-
Measured from: 0
to: 992 [s; relative to TRIGTIME]
T50: 992 +/-
Measured from: 0
to: 992 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 992 second)
Measured from: 0
to: 992 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 992 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.209004 0.289726 -0.041272 0.000774
0.098507 0.097513 0.085181 0.080930 [error]
Peak 0.209004 0.289726 -0.041272 0.000774
0.098507 0.097513 0.085181 0.080930 [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 8.53e-08 7.62e-08 4.68e-08 4.35e-08 2.27e-07 2.55e-07 erg/cm2
Error 4.29e-08 4.52e-08 5.50e-08 1.05e-07 1.35e-07 1.95e-07 erg/cm2
Peak flux Power-law 1.54e-02 7.71e-03 2.37e-03 9.23e-04 2.60e-02 2.64e-02 ph/cm2/s
Error 7.86e-03 4.43e-03 2.71e-03 2.02e-03 1.25e-02 1.29e-02 ph/cm2/s
Fluence Cutoff-PL 8.67e-08 1.15e-07 1.46e-09 7.29e-16 2.04e-07 2.03e-07 erg/cm2
Error 4.82e-08 6.66e-08 1.45e-08 2.59e-10 8.53e-08 6.30e-08 erg/cm2
Peak flux Cutoff-PL 1.45e-02 1.26e-02 8.96e-05 2.07e-11 2.71e-02 2.72e-02 ph/cm2/s
Error 8.16e-03 6.78e-03 8.26e-04 7.72e-06 1.11e-02 1.11e-02 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 2.729 1.045 - - 1.14e-04 1.11e-04 57.210 57
CPL -8.473 0.000 26.7 6.2 9.72e+03 0.00e+00 51.640 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.729 1.045 - - 1.14e-04 1.11e-04 57.210 57
CPL -8.473 0.000 26.7 6.2 9.72e+03 0.00e+00 51.640 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 992.000 0.000 992.000
T90 992.000 0.000 992.000
T50 992.000 0.000 992.000
Peak 992.000 0.000 992.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
250.4661 -45.5661 0.0909 28.9 163.2 0.4477 2.1 TRIG_00552677
------------------------------------------
Foreground time interval of the image:
0.000 183.045 (delta_t = 183.045 [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 0.000 sec. to 183.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.72860 ( -0.837297 1.25292 )
Norm@50keV : 1.14095E-04 ( -0.000115176 0.000106509 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.21 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.673192e-01
Photon flux (15-150 keV) in 183 sec: 2.60356E-02 ( -0.0124322 0.0125836 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26785e-07 ( -1.17528e-07 1.52461e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 183.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -8.47344 ( )
Epeak [keV] : 26.6618 ( -6.52836 5.78711 )
Norm@50keV : 9719.90 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.64 using 59 PHA bins.
# Reduced chi-squared = 0.9221 for 56 degrees of freedom
# Null hypothesis probability = 6.405432e-01
Photon flux (15-150 keV) in 183 sec: 2.71221E-02 ( -0.0105913 0.0115299 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03547e-07 ( -8.0897e-08 8.97908e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 183.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97300 ( -14.6586 -4.973 )
beta : -9.37149 ( 9.37149 19.3258 )
Epeak [keV] : 26.8566 ( -6.20695 5.86067 )
Norm@50keV : 27.5896 ( -10.9099 148.551 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.13 using 59 PHA bins.
# Reduced chi-squared = 0.9477 for 55 degrees of freedom
# Null hypothesis probability = 5.851621e-01
Photon flux (15-150 keV) in 183 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] : 6.29277 (-1.7564 2.2966)
R^2/D10^2 : 9.28604E-02 (-0.0931591 0.283517)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.24 using 59 PHA bins.
# Reduced chi-squared = 0.9341 for 57 degrees of freedom
# Null hypothesis probability = 6.167642e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.545e-08 5.895e-08
25- 50 1.054e-07 7.038e-08
50-150 1.169e-08 1.165e-08
15-150 2.125e-07 1.431e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.1272 (-11.2024 34.9829)
Norm : 0.313419 (-0.194171 0.503723)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.60 using 59 PHA bins.
# Reduced chi-squared = 0.9755 for 57 degrees of freedom
# Null hypothesis probability = 5.276490e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.305e-08 5.790e-08
25- 50 8.493e-08 5.667e-08
50-150 2.785e-08 3.149e-08
15-150 2.058e-07 1.413e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.25568 (-1.75044 2.30384)
R1^2/D10^2 : 9.49646E-02 (-0.0704499 0.283365)
kT2 [keV] : 0.273407 (-0.273407 -0.273407)
R2^2/D10^2 : 1.57226E-04 (-0.000157587 -0.000157587)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.24 using 59 PHA bins.
# Reduced chi-squared = 0.9681 for 55 degrees of freedom
# Null hypothesis probability = 5.419699e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 183.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.72860 ( -0.837297 1.25292 )
Norm@50keV : 1.14095E-04 ( -0.000115176 0.000106509 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.21 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.673192e-01
Photon flux (15-150 keV) in 183 sec: 2.60356E-02 ( -0.0124322 0.0125836 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26785e-07 ( -1.17528e-07 1.52461e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 183.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -8.47344 ( )
Epeak [keV] : 26.6618 ( -6.52836 5.78711 )
Norm@50keV : 9719.90 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.64 using 59 PHA bins.
# Reduced chi-squared = 0.9221 for 56 degrees of freedom
# Null hypothesis probability = 6.405432e-01
Photon flux (15-150 keV) in 183 sec: 2.71221E-02 ( -0.0105913 0.0115299 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03547e-07 ( -8.0897e-08 8.97908e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 183.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97300 ( -4.75717 -4.973 )
beta : -9.37149 ( 9.37149 19.3258 )
Epeak [keV] : 26.8566 ( -6.20695 5.86067 )
Norm@50keV : 27.5896 ( -10.9099 148.551 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.13 using 59 PHA bins.
# Reduced chi-squared = 0.9477 for 55 degrees of freedom
# Null hypothesis probability = 5.851621e-01
Photon flux (15-150 keV) in 183 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] : 6.29277 (-1.7564 2.2966)
R^2/D10^2 : 9.28604E-02 (-0.0931591 0.283517)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.24 using 59 PHA bins.
# Reduced chi-squared = 0.9341 for 57 degrees of freedom
# Null hypothesis probability = 6.167642e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.545e-08 5.951e-08
25- 50 1.054e-07 6.975e-08
50-150 1.169e-08 1.117e-08
15-150 2.125e-07 1.316e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.1272 (-11.2024 34.9829)
Norm : 0.313419 (-0.194171 0.503723)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.60 using 59 PHA bins.
# Reduced chi-squared = 0.9755 for 57 degrees of freedom
# Null hypothesis probability = 5.276490e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.305e-08 5.892e-08
25- 50 8.493e-08 5.916e-08
50-150 2.785e-08 3.088e-08
15-150 2.058e-07 1.330e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.25568 (-1.75044 2.30384)
R1^2/D10^2 : 9.49646E-02 (-0.0704499 0.283365)
kT2 [keV] : 0.273407 (-0.273407 -0.273407)
R2^2/D10^2 : 1.57226E-04 (-0.000157587 -0.000157587)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.24 using 59 PHA bins.
# Reduced chi-squared = 0.9681 for 55 degrees of freedom
# Null hypothesis probability = 5.419699e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Tue Apr 2 23:33:01 EDT 2013