batgrbproduct Analysis for Trigger=508712
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): Wed Nov 30 13:01:30 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger508712/GCN5_download_cron
======================================================================
Trigger: 00508712 Segment: 000
BAT Trigger Time: 344276301.952 [s; MET]
Trigger Stop: 344276304 [s; MET]
UTC: 2011-11-29T16:18:14.327920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 307.440815849486 Dec: -52.7242285825363 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.34
Image Trigger?: NO
Rate S/N Ratio: 10.1980390271856 [ if not an image trigger ]
Image S/N Ratio: 7.34
Flight Position: [ source = BAT ]
RA: 307.440815849486 Dec: -52.7242285825363 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 307.420855518498 Dec: -52.7225718911987 [deg; J2000]
{ 20h 29m 41.0s , -52d 43' 21.3" }
+/- 2.13335751300087 [arcmin] (estimated 90% radius based on SNR)
+/- 0.932082389450831 [arcmin] (formal 1-sigma fit error)
SNR: 10.3045128078963
Angular difference between Flight and Ground position is 0.732134 arcmin
Partial Coding Fraction: 0.6171875 [ including projection effects ]
Duration
T90: 7.86799991130829 +/- 1.14318327726811
Measured from: -6.06399989128113
to: 1.80400002002716 [s; relative to TRIGTIME]
T50: 5.63599997758865 +/- 1.35061466629333
Measured from: -4.42399990558624
to: 1.21200007200241 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.407999992370605
to: 1.40799999237061 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.29199999570847
to: 2.87999999523163 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.183273 0.150368 0.053255 0.002264
0.022380 0.022377 0.019351 0.016379 [error]
Peak 0.044936 0.037827 0.017051 -0.006566
0.008068 0.007679 0.006551 0.005417 [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 6.17e-08 6.01e-08 4.09e-08 4.37e-08 1.80e-07 2.06e-07 erg/cm2
Error 1.21e-08 1.18e-08 1.64e-08 3.30e-08 3.85e-08 5.78e-08 erg/cm2
Peak flux Power-law 4.81e-01 2.97e-01 1.18e-01 6.28e-02 9.28e-01 9.58e-01 ph/cm2/s
Error 1.38e-01 6.84e-02 5.21e-02 5.23e-02 2.01e-01 2.09e-01 ph/cm2/s
Fluence Cutoff-PL 6.16e-08 6.13e-08 3.90e-08 2.70e-08 1.76e-07 1.89e-07 erg/cm2
Error 1.22e-08 1.41e-08 2.91e-08 4.19e-08 5.64e-08 6.99e-08 erg/cm2
Peak flux Cutoff-PL 4.66e-01 3.12e-01 1.15e-01 3.39e-02 9.16e-01 9.27e-01 ph/cm2/s
Error 1.50e-01 8.68e-02 8.62e-02 6.19e-02 2.04e-01 2.21e-01 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 9.36e-01 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 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 1.955 0.000 2.5 0.0 4.81e-03 0.00e+00 39.480 56
The chi2 of BB fit is 43.60 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 1.898 0.000 9.2 0.0 9.51e-03 0.00e+00 52.540 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 9.172 -6.292 2.880
T90 7.868 -6.064 1.804
T50 5.636 -4.424 1.212
Peak 1.000 0.408 1.408
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
307.4209 -52.7226 0.0186 33.8 -40.0 0.4247 10.3 TRIG_00508712
------------------------------------------
Foreground time interval of the image:
-6.292 2.880 (delta_t = 9.172 [sec])
Background time interval of the image:
-239.952 -6.292 (delta_t = 233.660 [sec])
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 -6.292 sec. to 2.880 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 9.172 sec: 0.393421 ( -0.0637974 0.0638211 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80283e-07 ( -3.73209e-08 3.96704e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.292 sec. to 2.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95507 ( )
Epeak [keV] : 2.50465 ( )
Norm@50keV : 4.80662E-03 ( )
------------------------------------------------------------
# Chi-Squared = 39.48 using 59 PHA bins.
# Reduced chi-squared = 0.7050 for 56 degrees of freedom
# Null hypothesis probability = 9.538163e-01
Photon flux (15-150 keV) in 9.172 sec: 0.391148 ( -0.06522 0.064747 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75763e-07 ( -6.91688e-08 4.37119e-08 ) ergs/cm2
Band function
Time interval is from -6.292 sec. to 2.880 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 9.172 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] : 6.18024 (-1.0173 1.21805)
R^2/D10^2 : 1.24377 (-0.669787 1.49114)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 43.60 using 59 PHA bins.
# Reduced chi-squared = 0.7649 for 57 degrees of freedom
# Null hypothesis probability = 9.042049e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.034e-08 1.837e-08
25- 50 6.413e-08 2.204e-08
50-150 6.620e-09 3.998e-09
15-150 1.311e-07 3.630e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.1278 (-9.30162 16.4598)
Norm : 3.43195 (-1.14393 1.96272)
------------------------------------------------------------
# Chi-Squared = 40.08 using 59 PHA bins.
# Reduced chi-squared = 0.7032 for 57 degrees of freedom
# Null hypothesis probability = 9.564822e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.063e-08 1.208e-08
25- 50 6.537e-08 1.840e-08
50-150 3.124e-08 1.866e-08
15-150 1.572e-07 4.187e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.28912 (-1.25675 1.27213)
R1^2/D10^2 : 2.18574 (-1.299 4.59553)
kT2 [keV] : 24.6131 (-12.9821 120.469)
R2^2/D10^2 : 2.50402E-03 (-0.00251935 0.0473284)
------------------------------------------------------------
# Chi-Squared = 37.48 using 59 PHA bins.
# Reduced chi-squared = 0.6814 for 55 degrees of freedom
# Null hypothesis probability = 9.660206e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.317e-08 3.349e-08
25- 50 5.916e-08 3.059e-08
50-150 6.415e-08 4.520e-08
15-150 1.865e-07 8.785e-08
Peak spectrum fit
Power-law model
Time interval is from 0.408 sec. to 1.408 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 0.927814 ( -0.200966 0.200967 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0095e-08 ( -1.32605e-08 1.40177e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.408 sec. to 1.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89829 ( )
Epeak [keV] : 9.22596 ( )
Norm@50keV : 9.51425E-03 ( )
------------------------------------------------------------
# Chi-Squared = 52.54 using 59 PHA bins.
# Reduced chi-squared = 0.9382 for 56 degrees of freedom
# Null hypothesis probability = 6.066484e-01
Photon flux (15-150 keV) in 1 sec: 0.916345 ( -0.204312 0.204605 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.83225e-08 ( -1.38337e-08 1.52332e-08 ) ergs/cm2
Band function
Time interval is from 0.408 sec. to 1.408 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
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] : 7.83065 (-1.78946 2.44444)
R^2/D10^2 : 1.09011 (-0.725782 2.06487)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 57.00 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 57 degrees of freedom
# Null hypothesis probability = 4.750595e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.189e-08 5.736e-09
25- 50 2.005e-08 8.875e-09
50-150 4.903e-09 3.286e-09
15-150 3.684e-08 1.560e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 41.5015 (-18.1693 41.2926)
Norm : 5.84087 (-2.02773 3.65873)
------------------------------------------------------------
# Chi-Squared = 52.83 using 59 PHA bins.
# Reduced chi-squared = 0.9268 for 57 degrees of freedom
# Null hypothesis probability = 6.322358e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.358e-08 4.139e-09
25- 50 1.814e-08 6.665e-09
50-150 1.461e-08 9.131e-09
15-150 4.632e-08 1.623e-08
Double BB
R1^2/D10^2 : 9.68361E+05 ( )
kT2 [keV] : 8.91309 (-2.27671 3.29661)
R2^2/D10^2 : 0.607976 (-0.453469 0.337496)
------------------------------------------------------------
# Chi-Squared = 52.87 using 59 PHA bins.
# Chi-Squared = 52.23 using 59 PHA bins.
# Chi-Squared = 52.20 using 59 PHA bins.
# Reduced chi-squared = 0.9612 for 55 degrees of freedom
# Reduced chi-squared = 0.9497 for 55 degrees of freedom
# Reduced chi-squared = 0.9492 for 55 degrees of freedom
# Null hypothesis probability = 5.566249e-01
# Null hypothesis probability = 5.810461e-01
# Null hypothesis probability = 5.821453e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.389e-08 8.130e-09
25- 50 1.705e-08 8.890e-09
50-150 1.796e-08 1.094e-08
15-150 4.890e-08 2.376e-08
Plot creation:
Wed Nov 30 13:19:19 EST 2011