batgrbproduct Analysis for Trigger=521085
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): Sun Apr 29 06:17:31 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger521085/GCN5_download_cron
======================================================================
Trigger: 00521085 Segment: 000
BAT Trigger Time: 357321040 [s; MET]
Trigger Stop: 357321376 [s; MET]
UTC: 2012-04-28T15:50:31.849800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.519397311819 Dec: -47.4111418052543 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.8
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.8
Flight Position: [ source = BAT ]
RA: 248.519397311819 Dec: -47.4111418052543 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 248.498434567509 Dec: -47.4348971681897 [deg; J2000]
{ 16h 33m 59.6s , -47d 26' 05.6" }
+/- 3.57586673349822 [arcmin] (estimated 90% radius based on SNR)
+/- 2.60805010546752 [arcmin] (formal 1-sigma fit error)
SNR: 4.92689866560768
Angular difference between Flight and Ground position is 1.660032 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 336 +/-
Measured from: 0
to: 336 [s; relative to TRIGTIME]
T50: 336 +/-
Measured from: 0
to: 336 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 336 second)
Measured from: 0
to: 336 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 336 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.794188 0.629174 0.123453 0.037804
0.102712 0.096664 0.080680 0.068298 [error]
Peak 0.794188 0.629174 0.123453 0.037804
0.102712 0.096664 0.080680 0.068298 [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 2.52e-07 2.20e-07 1.32e-07 1.19e-07 6.54e-07 7.22e-07 erg/cm2
Error 4.90e-08 4.80e-08 6.05e-08 1.02e-07 1.44e-07 2.01e-07 erg/cm2
Peak flux Power-law 2.48e-02 1.21e-02 3.63e-03 1.38e-03 4.14e-02 4.19e-02 ph/cm2/s
Error 4.95e-03 2.53e-03 1.62e-03 1.11e-03 6.84e-03 7.02e-03 ph/cm2/s
Fluence Cutoff-PL 2.49e-07 2.33e-07 1.06e-07 2.50e-08 6.13e-07 0.00e+00 erg/cm2
Error 5.15e-08 6.22e-08 8.20e-08 1.19e-07 2.31e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.43e-02 1.29e-02 3.02e-03 3.65e-04 4.06e-02 4.15e-02 ph/cm2/s
Error 5.30e-03 3.37e-03 2.17e-03 1.33e-03 5.21e-03 7.64e-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 2.739 0.429 - - 1.80e-04 6.12e-05 59.590 57
CPL 1.938 0.000 2.5 0.0 6.23e-04 0.00e+00 59.270 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.739 0.429 - - 1.80e-04 6.12e-05 59.590 57
CPL 1.938 0.000 2.5 0.0 6.23e-04 0.00e+00 59.270 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 336.000 0.000 336.000
T90 336.000 0.000 336.000
T50 336.000 0.000 336.000
Peak 336.000 0.000 336.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
248.4984 -47.4349 0.0390 6.8 169.3 1.3588 4.9 TRIG_00521085
------------------------------------------
Foreground time interval of the image:
0.000 336.000 (delta_t = 336.000 [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 336.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.73947 ( -0.390678 0.466763 )
Norm@50keV : 1.80472E-04 ( -6.04474e-05 6.20503e-05 )
------------------------------------------------------------
# Chi-Squared = 59.59 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.817395e-01
Photon flux (15-150 keV) in 336 sec: 4.13532E-02 ( -0.0068407 0.00684557 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.54232e-07 ( -1.39154e-07 1.49514e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 336.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93784 ( )
Epeak [keV] : 2.49032 ( )
Norm@50keV : 6.22959E-04 ( )
------------------------------------------------------------
# Chi-Squared = 59.27 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 56 degrees of freedom
# Null hypothesis probability = 3.570936e-01
Photon flux (15-150 keV) in 336 sec: 4.05797E-02 ( -0.0069479 0.0034802 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.13344e-07 ( -1.46247e-07 3.15003e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 336.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73112 ( 1.74128 1.74128 )
beta : -3.36069 ( 3.36883 0.988692 )
Epeak [keV] : 8.35495 ( -8.02015 8.56552 )
Norm@50keV : 8.70985E-04 ( -0.000348419 9.39916 )
------------------------------------------------------------
# Chi-Squared = 59.17 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.260570e-01
Photon flux (15-150 keV) in 336 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] : 6.46979 (-1.07709 1.22695)
R^2/D10^2 : 0.107942 (-0.0566283 0.12967)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 62.66 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 57 degrees of freedom
# Null hypothesis probability = 2.825089e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.231e-07 7.725e-08
25- 50 2.610e-07 7.830e-08
50-150 3.224e-08 2.038e-08
15-150 5.162e-07 1.389e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 23.7833 (-7.63062 12.5698)
Norm : 0.410763 (-0.13899 0.239728)
------------------------------------------------------------
# Chi-Squared = 59.46 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.861093e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.445e-07 6.601e-08
25- 50 2.425e-07 7.431e-08
50-150 9.574e-08 6.086e-08
15-150 5.827e-07 1.572e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.69735 (-1.1578 1.48098)
R1^2/D10^2 : 99.5839 (-183.18 -184.837)
kT2 [keV] : 7.60758 (-1.41551 1.95506)
R2^2/D10^2 : 4.79175E-02 (-0.0339475 0.0763702)
------------------------------------------------------------
# Chi-Squared = 56.51 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 55 degrees of freedom
# Null hypothesis probability = 4.185022e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.272e-07 1.081e-07
25- 50 2.599e-07 1.507e-07
50-150 5.751e-08 4.116e-08
15-150 5.446e-07 2.838e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 336.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.73947 ( -0.390678 0.466763 )
Norm@50keV : 1.80472E-04 ( -6.04474e-05 6.20503e-05 )
------------------------------------------------------------
# Chi-Squared = 59.59 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.817395e-01
Photon flux (15-150 keV) in 336 sec: 4.13532E-02 ( -0.0068407 0.00684557 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.54232e-07 ( -1.39154e-07 1.49514e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 336.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93784 ( )
Epeak [keV] : 2.49032 ( )
Norm@50keV : 6.22959E-04 ( )
------------------------------------------------------------
# Chi-Squared = 59.27 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 56 degrees of freedom
# Null hypothesis probability = 3.570936e-01
Photon flux (15-150 keV) in 336 sec: 4.05797E-02 ( -0.0069479 0.0034802 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.13344e-07 ( -1.46247e-07 3.15003e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 336.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73112 ( 1.74128 1.74128 )
beta : -3.36069 ( 3.36883 0.988692 )
Epeak [keV] : 8.35495 ( -8.02015 8.58485 )
Norm@50keV : 8.70985E-04 ( -0.000348419 8.36757 )
------------------------------------------------------------
# Chi-Squared = 59.17 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.260570e-01
Photon flux (15-150 keV) in 336 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] : 6.46979 (-1.07709 1.22695)
R^2/D10^2 : 0.107942 (-0.0566283 0.12967)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 62.66 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 57 degrees of freedom
# Null hypothesis probability = 2.825089e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.231e-07 7.587e-08
25- 50 2.610e-07 8.701e-08
50-150 3.224e-08 1.977e-08
15-150 5.162e-07 1.496e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 23.7833 (-7.63062 12.5698)
Norm : 0.410763 (-0.13899 0.239728)
------------------------------------------------------------
# Chi-Squared = 59.46 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.861093e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.445e-07 5.809e-08
25- 50 2.425e-07 6.982e-08
50-150 9.574e-08 6.064e-08
15-150 5.827e-07 1.542e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.69735 (-1.1578 1.48098)
R1^2/D10^2 : 99.5839 (-183.18 -184.837)
kT2 [keV] : 7.60758 (-1.41551 1.95506)
R2^2/D10^2 : 4.79175E-02 (-0.0339475 0.0763702)
------------------------------------------------------------
# Chi-Squared = 56.51 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 55 degrees of freedom
# Null hypothesis probability = 4.185022e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.272e-07 1.150e-07
25- 50 2.599e-07 1.474e-07
50-150 5.751e-08 3.963e-08
15-150 5.446e-07 2.853e-07
Plot creation:
Sun Apr 29 06:40:46 EDT 2012