batgrbproduct Analysis for Trigger=430603
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): Mon Aug 2 11:57:13 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger430603/GCN5_download_cron
======================================================================
Trigger: 00430603 Segment: 000
BAT Trigger Time: 302420742.208 [s; MET]
Trigger Stop: 302420743.232 [s; MET]
UTC: 2010-08-02T05:45:36.166420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 2.45693694544105 Dec: 47.7518131459574 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.45
Image Trigger?: NO
Rate S/N Ratio: 13.6014705087354 [ if not an image trigger ]
Image S/N Ratio: 7.45
Flight Position: [ source = BAT ]
RA: 2.45693694544105 Dec: 47.7518131459574 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 2.48156671284727 Dec: 47.7513082890094 [deg; J2000]
{ 00h 09m 55.6s , +47d 45' 04.7" }
+/- 1.07503278640299 [arcmin] (estimated 90% radius based on SNR)
+/- 0.305075102492465 [arcmin] (formal 1-sigma fit error)
SNR: 27.4302789046893
Angular difference between Flight and Ground position is 0.994046 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 487.339999973774 +/- 26.4194649626413
Measured from: 0.256000101566315
to: 487.59600007534 [s; relative to TRIGTIME]
T50: 355.351999998093 +/- 32.263805837198
Measured from: 22.0720000863075
to: 377.4240000844 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0759999752044678
to: 0.924000024795532 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.29199999570847
to: 531.684000015259 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.037563 2.485488 1.522583 0.291943
0.109014 0.111718 0.098033 0.085532 [error]
Peak 0.014085 0.044043 0.048561 0.009662
0.005436 0.005906 0.005511 0.004440 [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 6.94e-07 1.03e-06 1.14e-06 2.38e-06 3.59e-06 5.24e-06 erg/cm2
Error 6.05e-08 5.61e-08 9.59e-08 4.15e-07 2.21e-07 5.02e-07 erg/cm2
Peak flux Power-law 2.06e-01 2.82e-01 2.84e-01 5.20e-01 9.40e-01 1.29e+00 ph/cm2/s
Error 5.76e-02 4.94e-02 4.10e-02 1.56e-01 1.35e-01 1.90e-01 ph/cm2/s
Fluence Cutoff-PL 6.55e-07 1.08e-06 1.14e-06 1.17e-06 3.43e-06 4.04e-06 erg/cm2
Error 7.05e-08 7.25e-08 1.03e-07 8.09e-07 2.62e-07 8.55e-07 erg/cm2
Peak flux Cutoff-PL 1.46e-01 2.97e-01 3.27e-01 2.03e-01 8.99e-01 9.74e-01 ph/cm2/s
Error 7.03e-02 5.82e-02 5.51e-02 2.16e-01 0.00e+00 0.00e+00 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 1.01e+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 1.852 0.103 - - 7.29e-04 4.46e-05 64.600 57
CPL 1.525 0.000 65.1 118.5 1.11e-03 7.64e-04 61.480 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 0.987 0.226 - - 8.17e-03 1.15e-03 67.480 57
CPL -0.262 1.211 105.2 114.4 2.87e-02 4.69e-02 63.060 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: 34.752000 sec.
T50 in the 50-300 keV band: 15.232000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 534.976 -3.292 531.684
T90 487.340 0.256 487.596
T50 355.352 22.072 377.424
Peak 1.000 -0.076 0.924
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
2.4816 +47.7513 0.0070 29.2 -7.3 1.2418 27.4 TRIG_00430603
------------------------------------------
Foreground time interval of the image:
-3.292 13.393 (delta_t = 16.685 [sec])
Background time interval of the image:
-169.107 -56.665 (delta_t = 112.443 [sec])
-55.208 -3.292 (delta_t = 51.916 [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 -3.292 sec. to 531.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85245 ( -0.101604 0.103459 )
Norm@50keV : 7.29166E-04 ( -4.47623e-05 4.43575e-05 )
------------------------------------------------------------
# Chi-Squared = 64.60 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 57 degrees of freedom
# Null hypothesis probability = 2.284217e-01
Photon flux (15-150 keV) in 535 sec: 0.102594 ( -0.00571314 0.00572123 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.58683e-06 ( -2.20374e-07 2.22127e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.292 sec. to 531.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52482 ( )
Epeak [keV] : 65.0993 ( -17.0859 219.869 )
Norm@50keV : 1.10713E-03 ( -0.000350447 0.00117807 )
------------------------------------------------------------
# Chi-Squared = 61.48 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 56 degrees of freedom
# Null hypothesis probability = 2.863898e-01
Photon flux (15-150 keV) in 535 sec: 0.100136 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.43328e-06 ( -2.6124e-07 2.62856e-07 ) ergs/cm2
Band function
Time interval is from -3.292 sec. to 531.684 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -5.93809E-02 ( -1.38552 3.53426 )
beta : -2.02447 ( 2.02447 0.168077 )
Epeak [keV] : 34.0746 ( -8.72781 46.2367 )
Norm@50keV : 1.10369E-02 ( -0.0110369 9.27686 )
------------------------------------------------------------
# Chi-Squared = 59.44 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 55 degrees of freedom
# Null hypothesis probability = 3.170596e-01
Photon flux (15-150 keV) in 535 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 -0.076 sec. to 0.924 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.987423 ( -0.231273 0.221324 )
Norm@50keV : 8.16797E-03 ( -0.00115261 0.00114477 )
------------------------------------------------------------
# Chi-Squared = 67.48 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 57 degrees of freedom
# Null hypothesis probability = 1.614842e-01
Photon flux (15-150 keV) in 1 sec: 0.939992 ( -0.134474 0.134689 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.86882e-08 ( -1.28031e-08 1.29328e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.261971 ( -1.38608 1.03691 )
Epeak [keV] : 105.189 ( -27.9044 200.969 )
Norm@50keV : 2.86938E-02 ( -0.0183116 0.0753928 )
------------------------------------------------------------
# Chi-Squared = 63.06 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 56 degrees of freedom
# Null hypothesis probability = 2.408942e-01
Photon flux (15-150 keV) in 1 sec: 0.899358 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.45541e-08 ( -1.3757e-08 1.36765e-08 ) ergs/cm2
Band function
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.262247 ( -0.978134 1.14864 )
beta : -10.00000 ( 8.25016e+08 8.25016e+08 )
Epeak [keV] : 105.166 ( -27.895 200.974 )
Norm@50keV : 2.87047E-02 ( -0.0183231 0.0754858 )
------------------------------------------------------------
# Chi-Squared = 63.06 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 55 degrees of freedom
# Null hypothesis probability = 2.127862e-01
Photon flux (15-150 keV) in 1 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:
Mon Aug 2 12:24:06 EDT 2010