batgrbproduct Analysis for Trigger=340734
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 13:49:14 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger340734/SDC
======================================================================
Trigger: 00340734 Segment: 000
BAT Trigger Time: 254302210.208 [s; MET]
Trigger Stop: 254302210.592 [s; MET]
UTC: 2009-01-22T07:30:05.771740 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 263.342979452095 Dec: -60.1351746096958 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.54
Image Trigger?: NO
Rate S/N Ratio: 10.7238052947636 [ if not an image trigger ]
Image S/N Ratio: 6.54
Flight Position: [ source = BAT ]
RA: 263.342979452095 Dec: -60.1351746096958 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 263.463963817007 Dec: -60.0533250255716 [deg; J2000]
{ 17h 33m 51.4s , -60d 03' 12.0" }
+/- 5.73044739281651 [arcmin] (estimated 90% radius based on SNR)
+/- 4.17760983401066 [arcmin] (formal 1-sigma fit error)
SNR: 2.51183963295135
Angular difference between Flight and Ground position is 6.100504 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
T50: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.38400000333786 second)
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.005293 0.005078 0.002617 0.001184
0.003567 0.003449 0.002861 0.002403 [error]
Peak 0.005293 0.005078 0.002617 0.001184
0.003567 0.003449 0.002861 0.002403 [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 1.44e-09 2.28e-09 2.74e-09 6.42e-09 8.31e-09 1.29e-08 erg/cm2
Error 1.26e-09 1.87e-09 2.45e-09 1.40e-08 6.05e-09 1.75e-08 erg/cm2
Peak flux Power-law 1.21e-01 1.06e-01 6.36e-02 5.75e-02 3.16e-01 3.48e-01 ph/cm2/s
Error 1.09e-01 8.68e-02 5.53e-02 1.11e-01 2.01e-01 2.25e-01 ph/cm2/s
Fluence Cutoff-PL 9.14e-10 3.10e-09 2.63e-09 2.82e-10 6.91e-09 6.95e-09 erg/cm2
Error 1.32e-09 2.32e-09 2.97e-09 1.21e-08 5.81e-09 1.42e-08 erg/cm2
Peak flux Cutoff-PL 7.40e-02 1.40e-01 6.55e-02 3.96e-03 2.84e-01 2.85e-01 ph/cm2/s
Error 1.13e-01 1.03e-01 7.07e-02 9.46e-02 2.02e-01 2.27e-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 1.736 1.342 - - 2.34e-03 1.99e-03 66.670 57
CPL -1.711 1.418 48.0 0.0 1.68e-01 0.00e+00 66.030 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 1.736 1.342 - - 2.34e-03 1.99e-03 66.670 57
CPL -0.826 0.000 49.5 -7.8 5.66e-02 5.00e+03 66.060 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 0.384 0.000 0.384
T90 0.384 0.000 0.384
T50 0.384 0.000 0.384
Peak 0.384 0.000 0.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
263.4640 -60.0533 0.0765 14.9 -50.1 0.0153 2.5 TRIG_00340734
------------------------------------------
Foreground time interval of the image:
0.000 0.384 (delta_t = 0.384 [sec])
Background time interval of the image:
-60.208 -2.208 (delta_t = 58.000 [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 0.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73640 ( -1.14467 1.53902 )
Norm@50keV : 2.34500E-03 ( -0.00234449 0.00162859 )
------------------------------------------------------------
# Chi-Squared = 66.67 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 57 degrees of freedom
# Null hypothesis probability = 1.787186e-01
Photon flux (15-150 keV) in 0.384 sec: 0.315521 ( -0.200185 0.201016 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.31352e-09 ( -5.75981e-09 6.34829e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.71126 ( 0.877372 3.71436 )
Epeak [keV] : 48.0051 ( -49.1671 -49.1671 )
Norm@50keV : 0.168246 ( )
------------------------------------------------------------
# Chi-Squared = 66.03 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 56 degrees of freedom
# Null hypothesis probability = 1.688460e-01
Photon flux (15-150 keV) in 0.384 sec: 0.283523 ( -0.190951 0.213911 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.91181e-09 ( -4.67919e-09 6.95032e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.905060 ( -3.77005 -0.994189 )
beta : -9.37167 ( 9.98264 19.9826 )
Epeak [keV] : 49.4336 ( -29.5271 188.62 )
Norm@50keV : 6.24514E-02 ( -0.0701711 929149 )
------------------------------------------------------------
# Chi-Squared = 66.05 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 55 degrees of freedom
# Null hypothesis probability = 1.461930e-01
Photon flux (15-150 keV) in 0.384 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 0.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73640 ( -1.14467 1.53902 )
Norm@50keV : 2.34500E-03 ( -0.00234449 0.00162859 )
------------------------------------------------------------
# Chi-Squared = 66.67 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 57 degrees of freedom
# Null hypothesis probability = 1.787186e-01
Photon flux (15-150 keV) in 0.384 sec: 0.315521 ( -0.200185 0.201016 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.31352e-09 ( -5.75981e-09 6.34829e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.825986 ( )
Epeak [keV] : 49.4902 ( -33.574 -49.2517 )
Norm@50keV : 5.66492E-02 ( -0.0730034 10002.4 )
------------------------------------------------------------
# Chi-Squared = 66.06 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 56 degrees of freedom
# Null hypothesis probability = 1.683493e-01
Photon flux (15-150 keV) in 0.384 sec: 0.283523 ( -0.190951 0.213911 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.91181e-09 ( -4.67919e-09 6.95032e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.905060 ( -3.77005 -0.994189 )
beta : -9.37167 ( 9.98264 19.9826 )
Epeak [keV] : 49.4336 ( -29.5271 241.623 )
Norm@50keV : 6.24514E-02 ( -0.0701711 929149 )
------------------------------------------------------------
# Chi-Squared = 66.05 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 55 degrees of freedom
# Null hypothesis probability = 1.461930e-01
Photon flux (15-150 keV) in 0.384 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 14:05:27 EDT 2011