batgrbproduct Analysis for Trigger=358488
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): Wed Jun 1 13:22:18 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger358488/SDC
======================================================================
Trigger: 00358488 Segment: 000
BAT Trigger Time: 270392352.96 [s; MET]
Trigger Stop: 270392353.024 [s; MET]
UTC: 2009-07-27T12:59:08.013500 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 352.720913246345 Dec: 80.5373497682801 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.96
Image Trigger?: NO
Rate S/N Ratio: 6.48074069840786 [ if not an image trigger ]
Image S/N Ratio: 5.96
Flight Position: [ source = BAT ]
RA: 352.720913246345 Dec: 80.5373497682801 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 352.813593223504 Dec: 80.5275899249771 [deg; J2000]
{ 23h 31m 15.3s , +80d 31' 39.3" }
+/- 4.50884869596118 [arcmin] (estimated 90% radius based on SNR)
+/- 2.86211803974607 [arcmin] (formal 1-sigma fit error)
SNR: 3.53784549965855
Angular difference between Flight and Ground position is 1.086080 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0640000104904175 second)
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.003835 0.005884 -0.001821 -0.001274
0.001268 0.001451 0.001206 0.001039 [error]
Peak 0.003835 0.005884 -0.001821 -0.001274
0.001268 0.001451 0.001206 0.001039 [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 8.46e-10 8.50e-10 6.00e-10 6.71e-10 2.56e-09 2.88e-09 erg/cm2
Error 4.81e-10 5.09e-10 6.01e-10 1.08e-09 1.60e-09 2.18e-09 erg/cm2
Peak flux Power-law 4.36e-01 2.44e-01 8.61e-02 3.98e-02 7.87e-01 8.06e-01 ph/cm2/s
Error 2.49e-01 1.44e-01 8.48e-02 5.96e-02 4.36e-01 4.49e-01 ph/cm2/s
Fluence Cutoff-PL 9.27e-10 2.25e-09 8.76e-11 5.46e-16 3.27e-09 3.29e-09 erg/cm2
Error 5.35e-10 1.00e-09 2.48e-10 9.81e-13 1.22e-09 1.22e-09 erg/cm2
Peak flux Cutoff-PL 4.36e-01 6.73e-01 1.56e-02 5.13e-08 1.12e+00 1.13e+00 ph/cm2/s
Error 2.63e-01 2.77e-01 4.15e-02 8.90e-05 4.02e-01 4.03e-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 2.543 0.775 - - 3.90e-03 2.90e-03 60.980 57
CPL -9.600 0.000 30.3 5.0 6.45e+05 0.00e+00 47.210 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 2.543 0.775 - - 3.90e-03 2.90e-03 60.980 57
CPL -9.600 0.000 30.3 5.0 6.45e+05 0.00e+00 47.210 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 0.064 0.000 0.064
T90 0.064 0.000 0.064
T50 0.064 0.000 0.064
Peak 0.064 0.000 0.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
352.8136 +80.5276 0.0545 21.4 -10.0 0.0084 3.5 TRIG_00358488
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.960 -8.960 (delta_t = 52.000 [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 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.54343 ( -0.608067 0.942724 )
Norm@50keV : 3.90228E-03 ( -0.00267007 0.00313389 )
------------------------------------------------------------
# Chi-Squared = 60.98 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.348859e-01
Photon flux (15-150 keV) in 0.064 sec: 0.787150 ( -0.434592 0.438054 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56099e-09 ( -1.51862e-09 1.6908e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.59993 ( )
Epeak [keV] : 30.2694 ( -4.94439 5.05005 )
Norm@50keV : 6.44602E+05 ( )
------------------------------------------------------------
# Chi-Squared = 47.21 using 59 PHA bins.
# Reduced chi-squared = 0.8431 for 56 degrees of freedom
# Null hypothesis probability = 7.922901e-01
Photon flux (15-150 keV) in 0.064 sec: 1.12441 ( -0.389597 0.41471 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.27009e-09 ( -1.16964e-09 1.26574e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99976 ( -7869.66 -7854.66 )
beta : -9.37167 ( 10 19.9886 )
Epeak [keV] : 30.5954 ( -5.42924 5.60107 )
Norm@50keV : 503.141 ( -504.112 1308.46 )
------------------------------------------------------------
# Chi-Squared = 48.28 using 59 PHA bins.
# Reduced chi-squared = 0.8779 for 55 degrees of freedom
# Null hypothesis probability = 7.271612e-01
Photon flux (15-150 keV) in 0.064 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 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.54343 ( -0.608067 0.942724 )
Norm@50keV : 3.90228E-03 ( -0.00267007 0.00313389 )
------------------------------------------------------------
# Chi-Squared = 60.98 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.348859e-01
Photon flux (15-150 keV) in 0.064 sec: 0.787150 ( -0.434592 0.438054 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56099e-09 ( -1.51862e-09 1.6908e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.59993 ( )
Epeak [keV] : 30.2694 ( -4.94439 5.05005 )
Norm@50keV : 6.44602E+05 ( )
------------------------------------------------------------
# Chi-Squared = 47.21 using 59 PHA bins.
# Reduced chi-squared = 0.8431 for 56 degrees of freedom
# Null hypothesis probability = 7.922901e-01
Photon flux (15-150 keV) in 0.064 sec: 1.12441 ( -0.389597 0.41471 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.27009e-09 ( -1.16964e-09 1.26574e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99976 ( -7869.66 -7854.66 )
beta : -9.37167 ( 10 19.9466 )
Epeak [keV] : 30.5954 ( -5.42924 5.60107 )
Norm@50keV : 503.141 ( -504.112 1308.46 )
------------------------------------------------------------
# Chi-Squared = 48.28 using 59 PHA bins.
# Reduced chi-squared = 0.8779 for 55 degrees of freedom
# Null hypothesis probability = 7.271612e-01
Photon flux (15-150 keV) in 0.064 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:
Wed Jun 1 13:35:29 EDT 2011