batgrbproduct Analysis for Trigger=344858
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 v2.42
Process Start Time (local time): Thu Mar 26 18:28:28 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger344858/SDC
======================================================================
Trigger: 00344858 Segment: 000
BAT Trigger Time: 257728602.688 [s; MET]
Trigger Stop: 257728603.712 [s; MET]
UTC: 2009-03-02T23:16:38.145360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 101.765061357004 Dec: -62.9244405638904 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.52
Image Trigger?: NO
Rate S/N Ratio: 19.0787840283389 [ if not an image trigger ]
Image S/N Ratio: 5.52
Flight Position: [ source = BAT ]
RA: 101.765061357004 Dec: -62.9244405638904 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 101.652512023973 Dec: -62.9880114653987 [deg; J2000]
{ 06h 46m 36.6s , -62d 59' 16.8" }
+/- 3.95799994565871 [arcmin] (estimated 90% radius based on SNR)
+/- 2.75033572939585 [arcmin] (formal 1-sigma fit error)
SNR: 4.26168696155403
Angular difference between Flight and Ground position is 4.896501 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 1.02400001883507 +/-
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
T50: 1.02400001883507 +/-
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02400001883507 second)
Measured from: -1.49011611938477e-08
to: 1.02400000393391 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.004684 0.002945 0.013922 0.034512
0.006494 0.007061 0.007485 0.008718 [error]
Peak 0.004684 0.002945 0.013922 0.034512
0.006494 0.007061 0.007485 0.008718 [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 1.23e-10 1.04e-09 7.85e-09 3.41e-07 2.95e-08 3.50e-07 erg/cm2
Error 8.99e-10 2.37e-09 7.64e-09 4.41e-07 2.51e-08 4.46e-07 erg/cm2
Peak flux Power-law 3.67e-03 1.63e-02 6.17e-02 8.43e-01 1.80e-01 9.24e-01 ph/cm2/s
Error 2.80e-02 3.96e-02 6.18e-02 1.03e+00 1.67e-01 1.07e+00 ph/cm2/s
Fluence Cutoff-PL 1.24e-10 1.05e-09 7.92e-09 3.38e-07 2.97e-08 3.18e-07 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 Cutoff-PL 6.29e-06 1.47e-03 6.36e-02 8.39e-01 1.89e-01 7.61e-01 ph/cm2/s
Error 2.18e-02 7.62e-03 7.24e-02 1.25e-01 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 2.10e-11 5.20e-10 8.87e-09 8.11e-08 3.25e-08 2.04e-07 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 8.67e-04 7.22e-03 6.63e-02 2.95e-01 1.87e-01 5.28e-01 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 -0.918 0.640 - - 8.52e-04 1.32e-03 66.470 57
CPL -7.032 0.000 160.2 0.0 4.71e-03 3.28e-02 65.970 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 -0.918 0.640 - - 8.52e-04 1.32e-03 66.470 57
CPL -7.032 0.000 160.2 0.0 4.71e-03 3.28e-02 65.970 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 -0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
101.6525 -62.9880 0.0454 17.5 37.0 0.0656 4.3 TRIG_00344858
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-21.787 -10.688 (delta_t = 11.099 [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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.917580 ( 0.917723 2.19804 )
Norm@50keV : 8.51976E-04 ( -0.000851902 0.00178131 )
------------------------------------------------------------
# Chi-Squared = 66.47 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 57 degrees of freedom
# Null hypothesis probability = 1.830807e-01
Photon flux (15-150 keV) in 1.024 sec: 0.180410 ( -0.18041 0.152813 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94999e-08 ( -2.94999e-08 2.07587e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -7.03244 ( )
Epeak [keV] : 160.209 ( -158.643 -158.643 )
Norm@50keV : 4.70504E-03 ( -0.00519458 0.0604001 )
------------------------------------------------------------
# Chi-Squared = 65.97 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 56 degrees of freedom
# Null hypothesis probability = 1.701092e-01
Photon flux (15-150 keV) in 1.024 sec: 0.189073 ( -0.125271 0.12531 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9671e-08 ( 2.07905e-08 -2.9671e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.518336 ( 0.518022 0.518022 )
beta : 0.917168 ( -2.19668 -0.917691 )
Epeak [keV] : 10.6326 ( -10.6319 -10.6319 )
Norm@50keV : 1.68984E-03 ( -0.00168954 100565 )
------------------------------------------------------------
# Chi-Squared = 66.47 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 55 degrees of freedom
# Null hypothesis probability = 1.382559e-01
Photon flux (15-150 keV) in 1.024 sec: 0.186914 ( -0.133908 0.129434 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.24771e-08 ( -3.24771e-08 2.21203e-08 ) 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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.917580 ( 0.917723 2.19804 )
Norm@50keV : 8.51976E-04 ( -0.000851902 0.00178131 )
------------------------------------------------------------
# Chi-Squared = 66.47 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 57 degrees of freedom
# Null hypothesis probability = 1.830807e-01
Photon flux (15-150 keV) in 1.024 sec: 0.180410 ( -0.18041 0.152813 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94999e-08 ( -2.94999e-08 2.07587e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -7.03244 ( )
Epeak [keV] : 160.209 ( -158.643 -158.643 )
Norm@50keV : 4.70504E-03 ( -0.00519458 0.0604001 )
------------------------------------------------------------
# Chi-Squared = 65.97 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 56 degrees of freedom
# Null hypothesis probability = 1.701092e-01
Photon flux (15-150 keV) in 1.024 sec: 0.189073 ( -0.125271 0.12531 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9671e-08 ( 2.07905e-08 -2.9671e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.518336 ( 0.518022 0.518022 )
beta : 0.917168 ( -2.19668 -0.917691 )
Epeak [keV] : 10.6326 ( -10.6319 -10.6319 )
Norm@50keV : 1.68984E-03 ( -0.00168954 100565 )
------------------------------------------------------------
# Chi-Squared = 66.47 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 55 degrees of freedom
# Null hypothesis probability = 1.382559e-01
Photon flux (15-150 keV) in 1.024 sec: 0.186914 ( -0.133908 0.129434 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.24771e-08 ( -3.24771e-08 2.21203e-08 ) 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 11:19:12 EDT 2011