batgrbproduct Analysis for Trigger=516027
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 Feb 24 18:50:50 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger516027/GCN5_download_cron
======================================================================
Trigger: 00516027 Segment: 000
BAT Trigger Time: 351803152 [s; MET]
Trigger Stop: 351803472 [s; MET]
UTC: 2012-02-24T19:05:44.074300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 38.5256162184502 Dec: -43.825379237699 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.6
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.6
Flight Position: [ source = BAT ]
RA: 38.5256162184502 Dec: -43.825379237699 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 38.504236876874 Dec: -43.7954794534115 [deg; J2000]
{ 02h 34m 01.0s , -43d 47' 43.7" }
+/- 3.6099276562765 [arcmin] (estimated 90% radius based on SNR)
+/- 1.84312295945933 [arcmin] (formal 1-sigma fit error)
SNR: 4.86062317638824
Angular difference between Flight and Ground position is 2.018732 arcmin
Partial Coding Fraction: 0.890625 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.878762 0.467853 0.211312 0.069553
0.085828 0.087927 0.077374 0.068322 [error]
Peak 0.878762 0.467853 0.211312 0.069553
0.085828 0.087927 0.077374 0.068322 [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 2.69e-07 2.17e-07 1.19e-07 9.55e-08 6.48e-07 7.01e-07 erg/cm2
Error 4.69e-08 4.90e-08 5.83e-08 8.75e-08 1.39e-07 1.87e-07 erg/cm2
Peak flux Power-law 2.80e-02 1.27e-02 3.48e-03 1.18e-03 4.48e-02 4.53e-02 ph/cm2/s
Error 5.01e-03 2.71e-03 1.65e-03 1.01e-03 6.86e-03 7.03e-03 ph/cm2/s
Fluence Cutoff-PL 2.68e-07 2.18e-07 1.19e-07 9.47e-08 7.00e-07 0.00e+00 erg/cm2
Error 4.66e-08 4.91e-08 6.11e-08 6.60e-08 1.86e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.80e-02 1.27e-02 3.46e-03 1.17e-03 4.48e-02 4.52e-02 ph/cm2/s
Error 5.01e-03 2.72e-03 2.07e-03 1.24e-03 6.86e-03 6.99e-03 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 2.869 0.444 - - 1.79e-04 6.48e-05 53.820 57
CPL 1.973 0.812 0.9 9.5 7.70e-04 0.00e+00 55.360 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.869 0.444 - - 1.79e-04 6.48e-05 53.820 57
CPL 1.973 0.854 0.9 9.5 7.70e-04 0.00e+00 55.360 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
38.5042 -43.7955 0.0397 26.1 -174.0 1.6340 4.9 TRIG_00516027
------------------------------------------
Foreground time interval of the image:
0.000 193.940 (delta_t = 193.940 [sec])
195.000 320.000 (delta_t = 125.000 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 193.940000
195.000000 320.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.86933 ( -0.406357 0.481811 )
Norm@50keV : 1.79038E-04 ( -6.27719e-05 6.67544e-05 )
------------------------------------------------------------
# Chi-Squared = 53.82 using 59 PHA bins.
# Reduced chi-squared = 0.9441 for 57 degrees of freedom
# Null hypothesis probability = 5.953084e-01
Photon flux (15-150 keV) in 318.9 sec: 4.48493E-02 ( -0.00684932 0.00687097 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.47944e-07 ( -1.32775e-07 1.45274e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 193.940000
195.000000 320.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97266 ( -1.60533 0.0181864 )
Epeak [keV] : 0.875691 ( -0.223018 18.8488 )
Norm@50keV : 7.70338E-04 ( )
------------------------------------------------------------
# Chi-Squared = 55.36 using 59 PHA bins.
# Reduced chi-squared = 0.9886 for 56 degrees of freedom
# Null hypothesis probability = 4.989947e-01
Photon flux (15-150 keV) in 318.9 sec: 4.48207E-02 ( -0.0068439 0.0068715 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.00043e-07 ( -1.64492e-07 2.0754e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 193.940000
195.000000 320.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.78837 ( 1.78978 1.78978 )
beta : -2.96607 ( 2.96646 0.501914 )
Epeak [keV] : 4.45556 ( -4.39095 81.2886 )
Norm@50keV : 1.27843E-03 ( -0.000717457 1612.65 )
------------------------------------------------------------
# Chi-Squared = 53.79 using 59 PHA bins.
# Reduced chi-squared = 0.9780 for 55 degrees of freedom
# Null hypothesis probability = 5.208438e-01
Photon flux (15-150 keV) in 318.9 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] : 5.11090 (-0.812722 0.954302)
R^2/D10^2 : 0.326916 (-0.177001 0.415411)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 59.04 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 57 degrees of freedom
# Null hypothesis probability = 4.009299e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.766e-07 7.496e-08
25- 50 1.906e-07 6.474e-08
50-150 8.608e-09 6.085e-09
15-150 4.758e-07 1.462e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.9758 (-5.74725 9.75197)
Norm : 0.604242 (-0.233064 0.404713)
------------------------------------------------------------
# Chi-Squared = 56.11 using 59 PHA bins.
# Reduced chi-squared = 0.9844 for 57 degrees of freedom
# Null hypothesis probability = 5.083378e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.714e-07 6.504e-08
25- 50 2.181e-07 6.973e-08
50-150 5.426e-08 3.745e-08
15-150 5.438e-07 1.293e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.68170 (-0.890425 0.961879)
R1^2/D10^2 : 0.466571 (-0.267162 0.792729)
kT2 [keV] : 40.5543 (-25.495 -40.556)
R2^2/D10^2 : 7.01424E-05 (-6.83393e-05 0.00154193)
------------------------------------------------------------
# Chi-Squared = 50.82 using 59 PHA bins.
# Reduced chi-squared = 0.9240 for 55 degrees of freedom
# Null hypothesis probability = 6.349290e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.807e-07 1.343e-07
25- 50 1.849e-07 8.165e-08
50-150 3.174e-07 1.984e-07
15-150 7.830e-07 3.300e-07
Peak spectrum fit
Power-law model
Time interval is from 195.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.86933 ( -0.406357 0.481811 )
Norm@50keV : 1.79038E-04 ( -6.27719e-05 6.67544e-05 )
------------------------------------------------------------
# Chi-Squared = 53.82 using 59 PHA bins.
# Reduced chi-squared = 0.9441 for 57 degrees of freedom
# Null hypothesis probability = 5.953084e-01
Photon flux (15-150 keV) in 318.9 sec: 4.48493E-02 ( -0.00684932 0.00687097 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.47944e-07 ( -1.32775e-07 1.45274e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 195.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97266 ( -1.69029 0.0181864 )
Epeak [keV] : 0.875691 ( -0.223018 18.8488 )
Norm@50keV : 7.70338E-04 ( )
------------------------------------------------------------
# Chi-Squared = 55.36 using 59 PHA bins.
# Reduced chi-squared = 0.9886 for 56 degrees of freedom
# Null hypothesis probability = 4.989947e-01
Photon flux (15-150 keV) in 318.9 sec: 4.48207E-02 ( -0.0068439 0.0068715 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.00043e-07 ( -1.64492e-07 2.0754e-07 ) ergs/cm2
Band function
Time interval is from 195.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.78837 ( 1.78978 1.78978 )
beta : -2.96607 ( 2.96646 0.501914 )
Epeak [keV] : 4.45556 ( -4.39095 81.2886 )
Norm@50keV : 1.27843E-03 ( -0.000717457 1131.91 )
------------------------------------------------------------
# Chi-Squared = 53.79 using 59 PHA bins.
# Reduced chi-squared = 0.9780 for 55 degrees of freedom
# Null hypothesis probability = 5.208438e-01
Photon flux (15-150 keV) in 318.9 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] : 5.11090 (-0.812722 0.954302)
R^2/D10^2 : 0.326916 (-0.177001 0.415411)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 59.04 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 57 degrees of freedom
# Null hypothesis probability = 4.009299e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.766e-07 8.484e-08
25- 50 1.906e-07 6.738e-08
50-150 8.608e-09 6.173e-09
15-150 4.758e-07 1.378e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.9758 (-5.74725 9.75197)
Norm : 0.604242 (-0.233064 0.404713)
------------------------------------------------------------
# Chi-Squared = 56.11 using 59 PHA bins.
# Reduced chi-squared = 0.9844 for 57 degrees of freedom
# Null hypothesis probability = 5.083378e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.714e-07 6.252e-08
25- 50 2.181e-07 6.257e-08
50-150 5.426e-08 3.598e-08
15-150 5.438e-07 1.382e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.68170 (-0.890425 0.961879)
R1^2/D10^2 : 0.466571 (-0.267162 0.792729)
kT2 [keV] : 40.5543 (-25.495 -40.556)
R2^2/D10^2 : 7.01424E-05 (-6.83393e-05 0.00154193)
------------------------------------------------------------
# Chi-Squared = 50.82 using 59 PHA bins.
# Reduced chi-squared = 0.9240 for 55 degrees of freedom
# Null hypothesis probability = 6.349290e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.807e-07 9.951e-08
25- 50 1.849e-07 8.374e-08
50-150 3.174e-07 1.965e-07
15-150 7.830e-07 3.060e-07
Plot creation:
Fri Feb 24 19:16:09 EST 2012