batgrbproduct Analysis for Trigger=347744
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): Fri Jun 3 09:25:34 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger347744/SDC
======================================================================
Trigger: 00347744 Segment: 000
BAT Trigger Time: 259873052.096 [s; MET]
Trigger Stop: 259873054.144 [s; MET]
UTC: 2009-03-27T18:57:27.486100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 319.444617636782 Dec: 2.04790550454906 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.94
Image Trigger?: NO
Rate S/N Ratio: 5.74456264653803 [ if not an image trigger ]
Image S/N Ratio: 5.94
Flight Position: [ source = BAT ]
RA: 319.444617636782 Dec: 2.04790550454906 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 319.440932669873 Dec: 2.04876320095089 [deg; J2000]
{ 21h 17m 45.8s , +02d 02' 55.5" }
+/- 3.74571485614606 [arcmin] (estimated 90% radius based on SNR)
+/- 2.02864850345686 [arcmin] (formal 1-sigma fit error)
SNR: 4.61087209398649
Angular difference between Flight and Ground position is 0.226870 arcmin
Partial Coding Fraction: 0.328125 [ including projection effects ]
Duration
T90: 2.04800000786781 +/-
Measured from: 0
to: 2.04800000786781 [s; relative to TRIGTIME]
T50: 2.04800000786781 +/-
Measured from: 0
to: 2.04800000786781 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 2.04800000786781 second)
Measured from: 1.49011611938477e-08
to: 2.04800002276897 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 2.04800000786781 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.014141 0.058827 0.048041 0.019136
0.014883 0.014715 0.013256 0.012012 [error]
Peak -0.014141 0.058827 0.048041 0.019136
0.014883 0.014715 0.013256 0.012012 [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 6.69e-09 1.56e-08 2.87e-08 1.26e-07 7.80e-08 1.81e-07 erg/cm2
Error 4.82e-09 7.45e-09 1.20e-08 1.08e-07 3.20e-08 1.16e-07 erg/cm2
Peak flux Power-law 1.07e-01 1.33e-01 1.22e-01 1.95e-01 4.27e-01 5.53e-01 ph/cm2/s
Error 7.63e-02 6.48e-02 5.04e-02 1.53e-01 1.82e-01 2.27e-01 ph/cm2/s
Fluence Cutoff-PL 1.56e-09 2.21e-08 3.75e-08 2.91e-09 6.40e-08 6.42e-08 erg/cm2
Error 3.43e-09 1.68e-08 1.74e-08 1.12e-08 2.59e-08 2.68e-08 erg/cm2
Peak flux Cutoff-PL 2.24e-02 1.75e-01 1.73e-01 7.90e-03 3.78e-01 3.78e-01 ph/cm2/s
Error 5.19e-02 9.86e-02 7.60e-02 2.65e-02 1.61e-01 1.62e-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 1.152 0.591 - - 3.69e-03 1.51e-03 53.560 57
CPL -3.783 -0.326 60.9 14.7 7.56e-01 1.77e+02 45.880 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 1.152 0.591 - - 3.69e-03 1.51e-03 53.560 57
CPL -3.783 -0.326 60.9 14.7 7.56e-01 1.77e+02 45.880 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 2.048 0.000 2.048
T90 2.048 0.000 2.048
T50 2.048 0.000 2.048
Peak 2.048 0.000 2.048
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
319.4409 +2.0488 0.0414 43.7 -37.1 0.1317 4.6 TRIG_00347744
------------------------------------------
Foreground time interval of the image:
0.000 2.048 (delta_t = 2.048 [sec])
Background time interval of the image:
-60.096 -12.096 (delta_t = 48.000 [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 0.000 sec. to 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15176 ( -0.608643 0.572669 )
Norm@50keV : 3.68999E-03 ( -0.00152766 0.00149002 )
------------------------------------------------------------
# Chi-Squared = 53.56 using 59 PHA bins.
# Reduced chi-squared = 0.9397 for 57 degrees of freedom
# Null hypothesis probability = 6.049026e-01
Photon flux (15-150 keV) in 2.048 sec: 0.427079 ( -0.17936 0.18493 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.80184e-08 ( -3.18585e-08 3.22126e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.78298 ( 4.97187 4.31987 )
Epeak [keV] : 60.8566 ( -11.0612 18.3376 )
Norm@50keV : 0.756111 ( -2.97426 351.469 )
------------------------------------------------------------
# Chi-Squared = 45.88 using 59 PHA bins.
# Reduced chi-squared = 0.8192 for 56 degrees of freedom
# Null hypothesis probability = 8.307645e-01
Photon flux (15-150 keV) in 2.048 sec: 0.377702 ( -0.149696 0.173067 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.40113e-08 ( -2.3883e-08 2.79792e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38549 ( -1.21806 -0.49259 )
beta : -10.00000 ( 1.66792e+07 1.66792e+07 )
Epeak [keV] : 59.1464 ( -10.8411 19.9778 )
Norm@50keV : 1.63444 ( -1.60223 0.613979 )
------------------------------------------------------------
# Chi-Squared = 45.59 using 59 PHA bins.
# Reduced chi-squared = 0.8289 for 55 degrees of freedom
# Null hypothesis probability = 8.131681e-01
Photon flux (15-150 keV) in 2.048 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 0.000 sec. to 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15176 ( -0.608643 0.572669 )
Norm@50keV : 3.68999E-03 ( -0.00152766 0.00149002 )
------------------------------------------------------------
# Chi-Squared = 53.56 using 59 PHA bins.
# Reduced chi-squared = 0.9397 for 57 degrees of freedom
# Null hypothesis probability = 6.049026e-01
Photon flux (15-150 keV) in 2.048 sec: 0.427079 ( -0.17936 0.18493 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.80184e-08 ( -3.18585e-08 3.22126e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.78298 ( 4.97187 4.31987 )
Epeak [keV] : 60.8566 ( -11.0612 18.3376 )
Norm@50keV : 0.756111 ( -2.97426 351.469 )
------------------------------------------------------------
# Chi-Squared = 45.88 using 59 PHA bins.
# Reduced chi-squared = 0.8192 for 56 degrees of freedom
# Null hypothesis probability = 8.307645e-01
Photon flux (15-150 keV) in 2.048 sec: 0.377702 ( -0.149696 0.173067 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.40113e-08 ( -2.3883e-08 2.79792e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38549 ( -1.21806 -0.49259 )
beta : -10.00000 ( 1.66792e+07 1.66792e+07 )
Epeak [keV] : 59.1464 ( -10.8411 19.9778 )
Norm@50keV : 1.63444 ( -1.60223 0.61398 )
------------------------------------------------------------
# Chi-Squared = 45.59 using 59 PHA bins.
# Reduced chi-squared = 0.8289 for 55 degrees of freedom
# Null hypothesis probability = 8.131681e-01
Photon flux (15-150 keV) in 2.048 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:
Fri Jun 3 10:00:38 EDT 2011