batgrbproduct Analysis for Trigger=430094
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): Tue Jul 27 13:01:55 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger430094/GCN5_download_cron
======================================================================
Trigger: 00430094 Segment: 000
BAT Trigger Time: 301902143.808 [s; MET]
Trigger Stop: 301902144.832 [s; MET]
UTC: 2010-07-27T05:42:17.784900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 154.165673991183 Dec: -21.3644000852862 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.09
Image Trigger?: NO
Rate S/N Ratio: 13.856406460551 [ if not an image trigger ]
Image S/N Ratio: 8.09
Flight Position: [ source = BAT ]
RA: 154.165673991183 Dec: -21.3644000852862 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 154.182958709742 Dec: -21.4113972731087 [deg; J2000]
{ 10h 16m 43.9s , -21d 24' 41.0" }
+/- 1.59630516759457 [arcmin] (estimated 90% radius based on SNR)
+/- 0.835137787603078 [arcmin] (formal 1-sigma fit error)
SNR: 15.5938294715197
Angular difference between Flight and Ground position is 2.980596 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 86.4439999461174 +/- 13.0586939494838
Measured from: -62.2319999337196
to: 24.2120000123978 [s; relative to TRIGTIME]
T50: 11.12399995327 +/- 18.7286758414999
Measured from: 0.28000009059906
to: 11.404000043869 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.33199995756149
to: 2.33199995756149 [s; relative to TRIGTIME]
Total Fluence
Measured from: -74.6080000400543
to: 29.839999973774 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.765371 0.878600 0.505807 0.067001
0.047723 0.048982 0.043069 0.037436 [error]
Peak 0.042401 0.063971 0.037120 0.007522
0.005280 0.005509 0.004940 0.003873 [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 2.23e-07 3.40e-07 3.88e-07 8.47e-07 1.20e-06 1.80e-06 erg/cm2
Error 2.32e-08 2.24e-08 4.14e-08 1.87e-07 9.48e-08 2.25e-07 erg/cm2
Peak flux Power-law 4.43e-01 3.96e-01 2.44e-01 2.28e-01 1.18e+00 1.31e+00 ph/cm2/s
Error 6.60e-02 4.05e-02 3.86e-02 6.91e-02 1.20e-01 1.41e-01 ph/cm2/s
Fluence Cutoff-PL 2.14e-07 3.53e-07 3.87e-07 4.68e-07 1.16e-06 1.42e-06 erg/cm2
Error 2.65e-08 2.91e-08 4.37e-08 3.61e-07 1.13e-07 4.08e-07 erg/cm2
Peak flux Cutoff-PL 4.18e-01 4.29e-01 2.44e-01 9.84e-02 1.16e+00 1.19e+00 ph/cm2/s
Error 7.27e-02 5.47e-02 4.33e-02 1.15e-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 1.20e+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 1.808 0.127 - - 1.25e-03 9.61e-05 81.430 57
CPL 1.472 0.000 69.8 -24.2 1.92e-03 1.32e-03 80.010 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 1.700 0.180 - - 8.89e-03 1.07e-03 66.200 57
CPL 1.077 0.752 63.3 -22.7 2.02e-02 2.60e-02 63.800 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: 25.216000 sec.
T50 in the 50-300 keV band: 13.568000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 104.448 -74.608 29.840
T90 86.444 -62.232 24.212
T50 11.124 0.280 11.404
Peak 1.000 1.332 2.332
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
154.1830 -21.4114 0.0123 12.4 -123.1 1.5787 15.6 TRIG_00430094
------------------------------------------
Foreground time interval of the image:
-74.608 10.093 (delta_t = 84.701 [sec])
Background time interval of the image:
-239.808 -74.608 (delta_t = 165.200 [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 -74.608 sec. to 29.840 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80785 ( -0.125505 0.128454 )
Norm@50keV : 1.25197E-03 ( -9.66876e-05 9.54365e-05 )
------------------------------------------------------------
# Chi-Squared = 81.43 using 59 PHA bins.
# Reduced chi-squared = 1.429 for 57 degrees of freedom
# Null hypothesis probability = 1.854128e-02
Photon flux (15-150 keV) in 104.4 sec: 0.173047 ( -0.0115356 0.0115434 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20297e-06 ( -9.41851e-08 9.54576e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -74.608 sec. to 29.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47216 ( )
Epeak [keV] : 69.7789 ( -21.3471 -69.764 )
Norm@50keV : 1.91643E-03 ( -0.000731379 0.00190155 )
------------------------------------------------------------
# Chi-Squared = 80.01 using 59 PHA bins.
# Reduced chi-squared = 1.429 for 56 degrees of freedom
# Null hypothesis probability = 1.929333e-02
Photon flux (15-150 keV) in 104.4 sec: 0.169916 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15833e-06 ( -1.12439e-07 1.13149e-07 ) ergs/cm2
Band function
Time interval is from -74.608 sec. to 29.840 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.27543 ( 1.27651 1.27651 )
beta : -2.04133 ( 2.04259 0.321806 )
Epeak [keV] : 54.4134 ( -54.6012 99.6112 )
Norm@50keV : 2.55323E-03 ( -0.00253627 54.7678 )
------------------------------------------------------------
# Chi-Squared = 79.96 using 59 PHA bins.
# Reduced chi-squared = 1.454 for 55 degrees of freedom
# Null hypothesis probability = 1.561171e-02
Photon flux (15-150 keV) in 104.4 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 1.332 sec. to 2.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69978 ( -0.17657 0.183459 )
Norm@50keV : 8.88754E-03 ( -0.00108207 0.00106077 )
------------------------------------------------------------
# Chi-Squared = 66.20 using 59 PHA bins.
# Reduced chi-squared = 1.161 for 57 degrees of freedom
# Null hypothesis probability = 1.891620e-01
Photon flux (15-150 keV) in 1 sec: 1.18027 ( -0.120456 0.120456 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.22899e-08 ( -1.04506e-08 1.06818e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.332 sec. to 2.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07719 ( -0.823468 0.680807 )
Epeak [keV] : 63.3247 ( -17.8765 -63.3247 )
Norm@50keV : 2.02272E-02 ( -0.0116876 0.0402428 )
------------------------------------------------------------
# Chi-Squared = 63.80 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 56 degrees of freedom
# Null hypothesis probability = 2.212955e-01
Photon flux (15-150 keV) in 1 sec: 1.15645 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.67885e-08 ( -1.17244e-08 1.21908e-08 ) ergs/cm2
Band function
Time interval is from 1.332 sec. to 2.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07673 ( -0.55195 0.730887 )
beta : -10.00000 ( 3.27623e+11 3.27623e+11 )
Epeak [keV] : 63.2865 ( -17.8419 -63.286 )
Norm@50keV : 2.02399E-02 ( -0.0116341 0.040243 )
------------------------------------------------------------
# Chi-Squared = 63.80 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 55 degrees of freedom
# Null hypothesis probability = 1.946230e-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:
Tue Jul 27 13:19:39 EDT 2010