batgrbproduct Analysis for Trigger=410087
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 May 27 15:07:59 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger410087/SDC
======================================================================
Trigger: 00410087 Segment: 000
BAT Trigger Time: 286487952 [s; MET]
Trigger Stop: 286488440 [s; MET]
UTC: 2010-01-29T19:59:06.517200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.535042476768 Dec: -47.3755545925531 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.68
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.68
Flight Position: [ source = BAT ]
RA: 248.535042476768 Dec: -47.3755545925531 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 248.599187647812 Dec: -47.3908697153995 [deg; J2000]
{ 16h 34m 23.8s , -47d 23' 27.1" }
+/- 2.7911198317692 [arcmin] (estimated 90% radius based on SNR)
+/- 1.80491807486584 [arcmin] (formal 1-sigma fit error)
SNR: 7.01927045640149
Angular difference between Flight and Ground position is 2.763197 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 488 +/-
Measured from: 0
to: 488 [s; relative to TRIGTIME]
T50: 488 +/-
Measured from: 0
to: 488 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 488 second)
Measured from: 0
to: 488 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 488 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.387840 0.824368 0.409844 0.097594
0.140336 0.123090 0.111925 0.109764 [error]
Peak 1.387840 0.824368 0.409844 0.097594
0.140336 0.123090 0.111925 0.109764 [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 4.06e-07 4.06e-07 2.85e-07 3.16e-07 1.22e-06 1.41e-06 erg/cm2
Error 7.62e-08 6.60e-08 1.01e-07 2.19e-07 2.21e-07 3.50e-07 erg/cm2
Peak flux Power-law 2.74e-02 1.53e-02 5.36e-03 2.46e-03 4.94e-02 5.05e-02 ph/cm2/s
Error 5.29e-03 2.38e-03 1.83e-03 1.59e-03 6.86e-03 7.04e-03 ph/cm2/s
Fluence Cutoff-PL 4.06e-07 4.06e-07 2.84e-07 3.13e-07 1.22e-06 1.41e-06 erg/cm2
Error 7.62e-08 4.92e-08 1.01e-07 1.83e-07 2.21e-07 3.47e-07 erg/cm2
Peak flux Cutoff-PL 2.74e-02 1.53e-02 5.35e-03 2.44e-03 4.94e-02 5.05e-02 ph/cm2/s
Error 5.16e-03 2.37e-03 1.89e-03 1.90e-03 6.85e-03 7.02e-03 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 2.512 0.359 - - 2.50e-04 6.33e-05 44.510 57
CPL 1.831 0.000 15.7 0.0 5.07e-04 0.00e+00 48.330 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 2.512 0.359 - - 2.50e-04 6.33e-05 44.510 57
CPL 1.831 0.000 15.7 0.0 5.07e-04 0.00e+00 48.330 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 488.000 0.000 488.000
T90 488.000 0.000 488.000
T50 488.000 0.000 488.000
Peak 488.000 0.000 488.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
248.5992 -47.3909 0.0273 29.6 -14.9 2.6437 7.0 TRIG_00410087
------------------------------------------
Foreground time interval of the image:
0.000 488.000 (delta_t = 488.000 [sec])
Background time interval of the image:
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 488.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.51175 ( -0.339123 0.379303 )
Norm@50keV : 2.49577E-04 ( -6.36234e-05 6.29442e-05 )
------------------------------------------------------------
# Chi-Squared = 44.51 using 59 PHA bins.
# Reduced chi-squared = 0.7809 for 57 degrees of freedom
# Null hypothesis probability = 8.857184e-01
Photon flux (15-150 keV) in 488 sec: 4.93833E-02 ( -0.00685887 0.00685966 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22178e-06 ( -2.14871e-07 2.27759e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 488.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83091 ( )
Epeak [keV] : 15.6532 ( )
Norm@50keV : 5.06887E-04 ( )
------------------------------------------------------------
# Chi-Squared = 48.33 using 59 PHA bins.
# Reduced chi-squared = 0.8630 for 56 degrees of freedom
# Null hypothesis probability = 7.571700e-01
Photon flux (15-150 keV) in 488 sec: 4.93600E-02 ( -0.0068525 0.0068536 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22138e-06 ( -2.14071e-07 2.27018e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 488.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.63756 ( 1.63763 1.63763 )
beta : -2.51504 ( 2.51631 0.343211 )
Epeak [keV] : 7.47879 ( -7.2342 383.1 )
Norm@50keV : 1.46238E-03 ( -0.00064845 170693 )
------------------------------------------------------------
# Chi-Squared = 44.50 using 59 PHA bins.
# Reduced chi-squared = 0.8092 for 55 degrees of freedom
# Null hypothesis probability = 8.432504e-01
Photon flux (15-150 keV) in 488 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 488.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.51175 ( -0.339123 0.379303 )
Norm@50keV : 2.49577E-04 ( -6.36234e-05 6.29442e-05 )
------------------------------------------------------------
# Chi-Squared = 44.51 using 59 PHA bins.
# Reduced chi-squared = 0.7809 for 57 degrees of freedom
# Null hypothesis probability = 8.857184e-01
Photon flux (15-150 keV) in 488 sec: 4.93833E-02 ( -0.00685887 0.00685966 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22178e-06 ( -2.14871e-07 2.27759e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 488.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83091 ( )
Epeak [keV] : 15.6532 ( )
Norm@50keV : 5.06887E-04 ( )
------------------------------------------------------------
# Chi-Squared = 48.33 using 59 PHA bins.
# Reduced chi-squared = 0.8630 for 56 degrees of freedom
# Null hypothesis probability = 7.571700e-01
Photon flux (15-150 keV) in 488 sec: 4.93600E-02 ( -0.0068525 0.0068536 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22138e-06 ( -2.14071e-07 2.27018e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 488.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.63756 ( 1.63763 1.63763 )
beta : -2.51504 ( 2.51631 0.343211 )
Epeak [keV] : 7.47879 ( -7.2342 383.1 )
Norm@50keV : 1.46238E-03 ( -0.00064845 170693 )
------------------------------------------------------------
# Chi-Squared = 44.50 using 59 PHA bins.
# Reduced chi-squared = 0.8092 for 55 degrees of freedom
# Null hypothesis probability = 8.432504e-01
Photon flux (15-150 keV) in 488 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 May 27 15:39:17 EDT 2011