batgrbproduct Analysis for Trigger=521442
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): Thu May 3 11:28:00 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger521442/GCN5_download_cron
======================================================================
Trigger: 00521442 Segment: 000
BAT Trigger Time: 357714480 [s; MET]
Trigger Stop: 357714544 [s; MET]
UTC: 2012-05-03T05:07:51.833660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.519159551012 Dec: -47.4009374593369 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 10.62
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.62
Flight Position: [ source = BAT ]
RA: 248.519159551012 Dec: -47.4009374593369 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 248.541027602147 Dec: -47.4295887349718 [deg; J2000]
{ 16h 34m 09.8s , -47d 25' 46.5" }
+/- 2.2429147329172 [arcmin] (estimated 90% radius based on SNR)
+/- 1.05451399040256 [arcmin] (formal 1-sigma fit error)
SNR: 9.59306283272117
Angular difference between Flight and Ground position is 1.934818 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.505068 0.264700 0.073602 0.039322
0.046759 0.043976 0.037048 0.032375 [error]
Peak 0.505068 0.264700 0.073602 0.039322
0.046759 0.043976 0.037048 0.032375 [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 1.39e-07 1.11e-07 6.02e-08 4.76e-08 3.32e-07 3.58e-07 erg/cm2
Error 2.36e-08 2.29e-08 2.67e-08 3.92e-08 6.46e-08 8.53e-08 erg/cm2
Peak flux Power-law 7.21e-02 3.25e-02 8.78e-03 2.95e-03 1.15e-01 1.16e-01 ph/cm2/s
Error 1.26e-02 6.34e-03 3.76e-03 2.27e-03 1.68e-02 1.71e-02 ph/cm2/s
Fluence Cutoff-PL 1.39e-07 1.11e-07 6.02e-08 4.72e-08 3.58e-07 0.00e+00 erg/cm2
Error 2.36e-08 2.48e-08 2.66e-08 4.86e-08 9.55e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 7.22e-02 3.24e-02 8.73e-03 2.92e-03 1.15e-01 1.17e-01 ph/cm2/s
Error 1.26e-02 6.45e-03 4.04e-03 2.30e-03 1.68e-02 1.70e-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 2.887 0.406 - - 4.54e-04 1.49e-04 41.040 57
CPL 1.932 0.000 2.3 0.0 1.97e-03 0.00e+00 42.090 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.887 0.406 - - 4.54e-04 1.49e-04 41.040 57
CPL 1.932 0.000 2.3 0.0 1.97e-03 0.00e+00 42.090 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
248.5410 -47.4296 0.0201 0.3 -135.9 0.8717 9.6 TRIG_00521442
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.88685 ( -0.373581 0.438764 )
Norm@50keV : 4.53892E-04 ( -0.000145696 0.000152275 )
------------------------------------------------------------
# Chi-Squared = 41.04 using 59 PHA bins.
# Reduced chi-squared = 0.7200 for 57 degrees of freedom
# Null hypothesis probability = 9.450505e-01
Photon flux (15-150 keV) in 64 sec: 0.115108 ( -0.0167815 0.0167953 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32075e-07 ( -6.24096e-08 6.68589e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93226 ( )
Epeak [keV] : 2.27906 ( )
Norm@50keV : 1.96797E-03 ( )
------------------------------------------------------------
# Chi-Squared = 42.09 using 59 PHA bins.
# Reduced chi-squared = 0.7516 for 56 degrees of freedom
# Null hypothesis probability = 9.159243e-01
Photon flux (15-150 keV) in 64 sec: 0.115032 ( -0.0169244 0.016684 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.57519e-07 ( -9.77568e-08 9.33165e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.70736 ( 1.70637 1.70637 )
beta : -2.89522 ( 2.89334 0.378826 )
Epeak [keV] : 4.22559 ( -4.20045 160.065 )
Norm@50keV : 5.28316E-03 ( -0.00551959 1.07249e+06 )
------------------------------------------------------------
# Chi-Squared = 41.03 using 59 PHA bins.
# Reduced chi-squared = 0.7459 for 55 degrees of freedom
# Null hypothesis probability = 9.193376e-01
Photon flux (15-150 keV) in 64 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] : 5.55248 (-1.05053 1.26096)
R^2/D10^2 : 0.563273 (-0.333866 0.930178)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 52.06 using 59 PHA bins.
# Reduced chi-squared = 0.9133 for 57 degrees of freedom
# Null hypothesis probability = 6.605589e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.310e-07 3.869e-08
25- 50 1.098e-07 3.324e-08
50-150 7.238e-09 4.679e-09
15-150 2.480e-07 7.066e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.8027 (-6.44448 9.93301)
Norm : 1.30745 (-0.446716 0.818087)
------------------------------------------------------------
# Chi-Squared = 43.30 using 59 PHA bins.
# Reduced chi-squared = 0.7597 for 57 degrees of freedom
# Null hypothesis probability = 9.097227e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.341e-07 2.592e-08
25- 50 1.210e-07 3.014e-08
50-150 3.868e-08 2.296e-08
15-150 2.937e-07 6.490e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.05419 (-1.17775 1.3798)
R1^2/D10^2 : 7.65075 (-6.40551 152.166)
kT2 [keV] : 10.3025 (-3.23882 6.68896)
R2^2/D10^2 : 2.71544E-02 (-0.0243628 0.0422934)
------------------------------------------------------------
# Chi-Squared = 40.62 using 59 PHA bins.
# Reduced chi-squared = 0.7385 for 55 degrees of freedom
# Null hypothesis probability = 9.262430e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.401e-07 7.242e-08
25- 50 1.141e-07 6.253e-08
50-150 5.592e-08 3.590e-08
15-150 3.102e-07 1.562e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.88685 ( -0.373581 0.438764 )
Norm@50keV : 4.53892E-04 ( -0.000145696 0.000152275 )
------------------------------------------------------------
# Chi-Squared = 41.04 using 59 PHA bins.
# Reduced chi-squared = 0.7200 for 57 degrees of freedom
# Null hypothesis probability = 9.450505e-01
Photon flux (15-150 keV) in 64 sec: 0.115108 ( -0.0167815 0.0167953 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32075e-07 ( -6.24096e-08 6.68589e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93226 ( )
Epeak [keV] : 2.27906 ( )
Norm@50keV : 1.96797E-03 ( )
------------------------------------------------------------
# Chi-Squared = 42.09 using 59 PHA bins.
# Reduced chi-squared = 0.7516 for 56 degrees of freedom
# Null hypothesis probability = 9.159243e-01
Photon flux (15-150 keV) in 64 sec: 0.115032 ( -0.0169244 0.016684 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.57519e-07 ( -9.77568e-08 9.33165e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.70736 ( 1.70637 1.70637 )
beta : -2.89522 ( 2.89334 0.378826 )
Epeak [keV] : 4.22559 ( -4.20045 160.065 )
Norm@50keV : 5.28316E-03 ( -0.00551959 1.07249e+06 )
------------------------------------------------------------
# Chi-Squared = 41.03 using 59 PHA bins.
# Reduced chi-squared = 0.7459 for 55 degrees of freedom
# Null hypothesis probability = 9.193376e-01
Photon flux (15-150 keV) in 64 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] : 5.55248 (-1.05053 1.26096)
R^2/D10^2 : 0.563273 (-0.333866 0.930178)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 52.06 using 59 PHA bins.
# Reduced chi-squared = 0.9133 for 57 degrees of freedom
# Null hypothesis probability = 6.605589e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.310e-07 3.600e-08
25- 50 1.098e-07 3.229e-08
50-150 7.238e-09 4.824e-09
15-150 2.480e-07 7.114e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.8027 (-6.44448 9.93301)
Norm : 1.30745 (-0.446716 0.818087)
------------------------------------------------------------
# Chi-Squared = 43.30 using 59 PHA bins.
# Reduced chi-squared = 0.7597 for 57 degrees of freedom
# Null hypothesis probability = 9.097227e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.341e-07 2.886e-08
25- 50 1.210e-07 2.976e-08
50-150 3.868e-08 2.390e-08
15-150 2.937e-07 6.582e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.05419 (-1.17775 1.3798)
R1^2/D10^2 : 7.65075 (-6.40551 152.166)
kT2 [keV] : 10.3025 (-3.23882 6.68896)
R2^2/D10^2 : 2.71544E-02 (-0.0243628 0.0422934)
------------------------------------------------------------
# Chi-Squared = 40.62 using 59 PHA bins.
# Reduced chi-squared = 0.7385 for 55 degrees of freedom
# Null hypothesis probability = 9.262430e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.401e-07 7.312e-08
25- 50 1.141e-07 6.368e-08
50-150 5.592e-08 3.696e-08
15-150 3.102e-07 1.556e-07
Plot creation:
Thu May 3 11:41:54 EDT 2012