batgrbproduct Analysis for Trigger=412081
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): Mon May 9 13:16:20 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger412081/SDC
======================================================================
Trigger: 00412081 Segment: 000
BAT Trigger Time: 287676447.552 [s; MET]
Trigger Stop: 287676448.064 [s; MET]
UTC: 2010-02-12T14:07:22.028320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 356.46191166072 Dec: 49.4973281295149 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.49
Image Trigger?: NO
Rate S/N Ratio: 28.4077454226836 [ if not an image trigger ]
Image S/N Ratio: 14.49
Flight Position: [ source = BAT ]
RA: 356.46191166072 Dec: 49.4973281295149 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 356.474393090101 Dec: 49.4898481715012 [deg; J2000]
{ 23h 45m 53.9s , +49d 29' 23.5" }
+/- 1.82423936876897 [arcmin] (estimated 90% radius based on SNR)
+/- 0.683257108607807 [arcmin] (formal 1-sigma fit error)
SNR: 12.8867779625474
Angular difference between Flight and Ground position is 0.661838 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 164.971999943256 +/- 13.4904867077891
Measured from: -38.311999976635
to: 126.659999966621 [s; relative to TRIGTIME]
T50: 84.7119998931885 +/- 25.7886539612541
Measured from: -2.83199995756149
to: 81.879999935627 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.339999973773956
to: 0.660000026226044 [s; relative to TRIGTIME]
Total Fluence
Measured from: -44.1159999966621
to: 134.051999986172 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.014481 0.910547 0.308041 0.089029
0.070663 0.071774 0.069637 0.074024 [error]
Peak 0.069152 0.097780 0.080935 0.007300
0.006508 0.006899 0.006775 0.006150 [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 3.20e-07 3.55e-07 2.81e-07 3.67e-07 1.09e-06 1.32e-06 erg/cm2
Error 3.83e-08 3.59e-08 5.85e-08 1.46e-07 1.30e-07 2.21e-07 erg/cm2
Peak flux Power-law 6.34e-01 6.97e-01 5.47e-01 7.07e-01 2.14e+00 2.58e+00 ph/cm2/s
Error 8.86e-02 5.84e-02 5.54e-02 1.51e-01 1.67e-01 2.15e-01 ph/cm2/s
Fluence Cutoff-PL 3.09e-07 3.80e-07 2.41e-07 8.36e-08 9.90e-07 1.01e-06 erg/cm2
Error 4.16e-08 4.74e-08 7.93e-08 2.21e-07 1.58e-07 2.93e-07 erg/cm2
Peak flux Cutoff-PL 6.04e-01 7.11e-01 5.58e-01 5.33e-01 2.12e+00 2.41e+00 ph/cm2/s
Error 1.08e-01 6.63e-02 6.15e-02 2.74e-01 1.76e-01 3.42e-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 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 2.338 0.208 - - 6.36e-04 9.53e-05 57.610 57
CPL 1.581 0.859 19.6 14.3 1.92e-03 0.00e+00 55.590 56
The chi2 of BB fit is 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 1.351 0.142 - - 1.78e-02 1.41e-03 76.030 57
CPL 1.112 0.445 191.9 0.0 2.33e-02 1.37e-02 75.430 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: 0.960000 sec.
T50 in the 50-300 keV band: 0.448000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 178.168 -44.116 134.052
T90 164.972 -38.312 126.660
T50 84.712 -2.832 81.880
Peak 1.000 -0.340 0.660
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
356.4744 +49.4898 0.0149 15.6 -102.3 1.1950 12.9 TRIG_00412081
------------------------------------------
Foreground time interval of the image:
-44.116 10.149 (delta_t = 54.265 [sec])
Background time interval of the image:
-314.851 -44.116 (delta_t = 270.735 [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 -44.116 sec. to 134.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.33843 ( -0.200857 0.214979 )
Norm@50keV : 6.36181E-04 ( -9.56489e-05 9.49849e-05 )
------------------------------------------------------------
# Chi-Squared = 57.61 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 57 degrees of freedom
# Null hypothesis probability = 4.525975e-01
Photon flux (15-150 keV) in 178.2 sec: 0.113605 ( -0.0102964 0.0102968 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0914e-06 ( -1.27742e-07 1.33093e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -44.116 sec. to 134.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58052 ( -1.10106 0.616037 )
Epeak [keV] : 19.6436 ( -16.6366 11.9575 )
Norm@50keV : 1.91600E-03 ( )
------------------------------------------------------------
# Chi-Squared = 55.59 using 59 PHA bins.
# Reduced chi-squared = 0.9927 for 56 degrees of freedom
# Null hypothesis probability = 4.903680e-01
Photon flux (15-150 keV) in 178.2 sec: 0.109852 ( -0.0108997 0.011079 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.90036e-07 ( -1.42817e-07 1.74164e-07 ) ergs/cm2
Band function
Time interval is from -44.116 sec. to 134.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.99795 ( 1.99809 1.99809 )
beta : -2.89465 ( 2.89479 0.694767 )
Epeak [keV] : 0.209711 ( -0.0943091 0.266035 )
Norm@50keV : 1.05218E-03 ( -9.512e-05 9.51199e-05 )
------------------------------------------------------------
# Chi-Squared = 56.09 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 55 degrees of freedom
# Null hypothesis probability = 4.338515e-01
Photon flux (15-150 keV) in 178.2 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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Peak spectrum fit
Power-law model
Time interval is from -0.340 sec. to 0.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35065 ( -0.141111 0.142564 )
Norm@50keV : 1.77739E-02 ( -0.00141456 0.00140838 )
------------------------------------------------------------
# Chi-Squared = 76.03 using 59 PHA bins.
# Reduced chi-squared = 1.334 for 57 degrees of freedom
# Null hypothesis probability = 4.686199e-02
Photon flux (15-150 keV) in 1 sec: 2.14153 ( -0.166837 0.166973 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73569e-07 ( -1.58861e-08 1.60675e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.340 sec. to 0.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11188 ( -0.579553 0.311424 )
Epeak [keV] : 191.876 ( -191.868 -191.868 )
Norm@50keV : 2.32864E-02 ( -0.00670356 0.0207234 )
------------------------------------------------------------
# Chi-Squared = 75.43 using 59 PHA bins.
# Reduced chi-squared = 1.347 for 56 degrees of freedom
# Null hypothesis probability = 4.276870e-02
Photon flux (15-150 keV) in 1 sec: 2.11534 ( -0.17624 0.17588 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70335e-07 ( -1.7606e-08 1.7161e-08 ) ergs/cm2
Band function
Time interval is from -0.340 sec. to 0.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12895 ( -0.199194 0.596616 )
beta : -9.37166 ( 9.99988 19.9999 )
Epeak [keV] : 204.286 ( -84.7766 -204.286 )
Norm@50keV : 2.28016E-02 ( -0.0017578 0.0208703 )
------------------------------------------------------------
# Chi-Squared = 75.43 using 59 PHA bins.
# Reduced chi-squared = 1.371 for 55 degrees of freedom
# Null hypothesis probability = 3.512919e-02
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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Plot creation:
Thu May 26 14:41:14 EDT 2011