batgrbproduct Analysis for Trigger=449542
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): Sat Mar 19 05:46:52 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger449542/GCN5_download_cron
======================================================================
Trigger: 00449542 Segment: 000
BAT Trigger Time: 322146866.368 [s; MET]
Trigger Stop: 322146867.392 [s; MET]
UTC: 2011-03-18T13:14:19.601160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 338.274381831747 Dec: -15.2822115542523 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.94
Image Trigger?: NO
Rate S/N Ratio: 41.194659848092 [ if not an image trigger ]
Image S/N Ratio: 16.94
Flight Position: [ source = BAT ]
RA: 338.274381831747 Dec: -15.2822115542523 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 338.291530067642 Dec: -15.2780029324511 [deg; J2000]
{ 22h 33m 10.0s , -15d 16' 40.8" }
+/- 0.847407417531669 [arcmin] (estimated 90% radius based on SNR)
+/- 0.2842545907514 [arcmin] (formal 1-sigma fit error)
SNR: 38.5339670070011
Angular difference between Flight and Ground position is 1.024141 arcmin
Partial Coding Fraction: 0.2734375 [ including projection effects ]
Duration
T90: 15.9599999189377 +/- 1.70310310026035
Measured from: -6.85999983549118
to: 9.1000000834465 [s; relative to TRIGTIME]
T50: 4.92799991369247 +/- 0.293720989544667
Measured from: 0.848000168800354
to: 5.77600008249283 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.95200002193451
to: 2.95200002193451 [s; relative to TRIGTIME]
Total Fluence
Measured from: -12.9879999756813
to: 10.6040000319481 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.942389 2.984997 2.293549 0.488885
0.062011 0.071200 0.065599 0.058384 [error]
Peak 0.152758 0.363821 0.364482 0.080847
0.014802 0.018745 0.018727 0.013890 [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 7.49e-07 1.31e-06 1.76e-06 4.82e-06 5.11e-06 8.63e-06 erg/cm2
Error 4.14e-08 4.31e-08 6.77e-08 4.08e-07 1.64e-07 4.53e-07 erg/cm2
Peak flux Power-law 2.01e+00 2.51e+00 2.27e+00 3.59e+00 8.02e+00 1.04e+01 ph/cm2/s
Error 2.09e-01 1.66e-01 1.44e-01 4.55e-01 4.66e-01 6.25e-01 ph/cm2/s
Fluence Cutoff-PL 6.71e-07 1.37e-06 1.82e-06 2.45e-06 4.93e-06 6.30e-06 erg/cm2
Error 5.15e-08 4.99e-08 7.58e-08 6.74e-07 1.82e-07 6.89e-07 erg/cm2
Peak flux Cutoff-PL 1.62e+00 2.69e+00 2.56e+00 1.62e+00 7.85e+00 8.48e+00 ph/cm2/s
Error 2.53e-01 1.95e-01 1.88e-01 6.74e-01 0.00e+00 0.00e+00 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 1.579 0.054 - - 2.31e-02 7.01e-04 59.580 57
CPL 1.053 0.235 94.1 23.4 4.13e-02 1.07e-02 43.110 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 1.140 0.089 - - 6.89e-02 3.91e-03 64.780 57
CPL 0.186 0.421 105.7 27.1 1.91e-01 8.71e-02 46.340 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: 14.912000 sec.
T50 in the 50-300 keV band: 4.160000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 23.592 -12.988 10.604
T90 15.960 -6.860 9.100
T50 4.928 0.848 5.776
Peak 1.000 1.952 2.952
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
338.2915 -15.2780 0.0050 38.2 -120.6 8.0786 38.5 TRIG_00449542
------------------------------------------
Foreground time interval of the image:
-12.988 10.604 (delta_t = 23.592 [sec])
Background time interval of the image:
-119.368 -12.988 (delta_t = 106.380 [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 -12.988 sec. to 10.604 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57907 ( -0.0542519 0.0544189 )
Norm@50keV : 2.30864E-02 ( -0.000700726 0.000700288 )
------------------------------------------------------------
# Chi-Squared = 59.58 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.818377e-01
Photon flux (15-150 keV) in 23.59 sec: 2.94781 ( -0.0950175 0.0952188 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10669e-06 ( -1.64095e-07 1.644e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.988 sec. to 10.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05271 ( -0.2407 0.228489 )
Epeak [keV] : 94.0732 ( -14.5566 32.2798 )
Norm@50keV : 4.13387E-02 ( -0.00902719 0.0123044 )
------------------------------------------------------------
# Chi-Squared = 43.11 using 59 PHA bins.
# Reduced chi-squared = 0.7699 for 56 degrees of freedom
# Null hypothesis probability = 8.964576e-01
Photon flux (15-150 keV) in 23.59 sec: 2.85185 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.92797e-06 ( -1.82587e-07 1.82256e-07 ) ergs/cm2
Band function
Time interval is from -12.988 sec. to 10.604 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.03165 ( -0.247559 2.77653 )
beta : -2.14031 ( 2.15864 0.497549 )
Epeak [keV] : 91.2988 ( -56.645 34.4937 )
Norm@50keV : 4.25046E-02 ( -0.010448 1.71281 )
------------------------------------------------------------
# Chi-Squared = 43.04 using 59 PHA bins.
# Reduced chi-squared = 0.7825 for 55 degrees of freedom
# Null hypothesis probability = 8.791169e-01
Photon flux (15-150 keV) in 23.59 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 1.952 sec. to 2.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13999 ( -0.0894199 0.0889035 )
Norm@50keV : 6.88618E-02 ( -0.00391107 0.00391053 )
------------------------------------------------------------
# Chi-Squared = 64.78 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 57 degrees of freedom
# Null hypothesis probability = 2.238078e-01
Photon flux (15-150 keV) in 1 sec: 8.02133 ( -0.466348 0.46663 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.1105e-07 ( -4.38821e-08 4.39852e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.952 sec. to 2.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.185605 ( -0.440372 0.401027 )
Epeak [keV] : 105.739 ( -17.5009 36.7591 )
Norm@50keV : 0.191186 ( -0.065067 0.109208 )
------------------------------------------------------------
# Chi-Squared = 46.34 using 59 PHA bins.
# Reduced chi-squared = 0.8274 for 56 degrees of freedom
# Null hypothesis probability = 8.180028e-01
Photon flux (15-150 keV) in 1 sec: 7.84604 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.89284e-07 ( -4.6306e-08 4.618e-08 ) ergs/cm2
Band function
Time interval is from 1.952 sec. to 2.952 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.185434 ( -0.348262 0.416869 )
beta : -10.00000 ( 6.83531e+10 6.83531e+10 )
Epeak [keV] : 105.715 ( -17.4951 36.7599 )
Norm@50keV : 0.191230 ( -0.0651331 0.109236 )
------------------------------------------------------------
# Chi-Squared = 46.34 using 59 PHA bins.
# Reduced chi-squared = 0.8425 for 55 degrees of freedom
# Null hypothesis probability = 7.908938e-01
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:
Sat Mar 19 06:36:41 EDT 2011