batgrbproduct Analysis for Trigger=339162
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.42
Process Start Time (local time): Sun Jan 4 22:49:55 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger339162/GCN5_download_cron
======================================================================
Trigger: 00339162 Segment: 000
BAT Trigger Time: 252769064 [s; MET]
Trigger Stop: 252769128 [s; MET]
UTC: 2009-01-04T13:37:39.611000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 170.255584719586 Dec: -61.9181717872455 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 11.99
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.99
Flight Position: [ source = BAT ]
RA: 170.255584719586 Dec: -61.9181717872455 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.243013909963 Dec: -61.9372928808152 [deg; J2000]
{ 11h 20m 58.3s , -61d 56' 14.3" }
+/- 2.72835984857902 [arcmin] (estimated 90% radius based on SNR)
+/- 1.41976127666482 [arcmin] (formal 1-sigma fit error)
SNR: 7.25106398698254
Angular difference between Flight and Ground position is 1.200916 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 71.5760000348091 +/- 13.747177754148
Measured from: 22.3320000767708
to: 93.9080001115799 [s; relative to TRIGTIME]
T50: 26.8640000224113 +/- 13.4325111453045
Measured from: 48.2640000879765
to: 75.1280001103878 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 72.9120000004768
to: 73.9120000004768 [s; relative to TRIGTIME]
Total Fluence
Measured from: 19.2039999961853
to: 98.3400000035763 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.681796 0.466075 0.077537 0.111750
0.047250 0.048157 0.044587 0.044773 [error]
Peak 0.021947 0.001559 0.014174 0.012279
0.005308 0.005421 0.005111 0.005079 [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 1.86e-07 1.81e-07 1.23e-07 1.31e-07 5.43e-07 6.21e-07 erg/cm2
Error 2.37e-08 2.38e-08 3.33e-08 6.55e-08 7.77e-08 1.16e-07 erg/cm2
Peak flux Power-law 1.32e-01 9.85e-02 4.89e-02 3.47e-02 2.96e-01 3.15e-01 ph/cm2/s
Error 1.07e-01 4.95e-02 4.96e-02 8.34e-02 1.24e-01 1.47e-01 ph/cm2/s
Fluence Cutoff-PL 1.85e-07 1.97e-07 7.70e-08 8.76e-09 4.66e-07 4.67e-07 erg/cm2
Error 2.51e-08 2.97e-08 5.08e-08 7.25e-08 8.78e-08 8.54e-08 erg/cm2
Peak flux Cutoff-PL 1.32e-01 9.85e-02 4.89e-02 3.43e-02 2.96e-01 3.14e-01 ph/cm2/s
Error 1.07e-01 4.96e-02 4.96e-02 8.28e-02 1.24e-01 1.46e-01 ph/cm2/s
Fluence Band 1.89e-07 1.85e-07 1.02e-07 8.31e-08 5.16e-07 5.64e-07 erg/cm2
Error 2.34e-08 2.81e-08 2.79e-08 5.71e-08 9.11e-08 1.15e-07 erg/cm2
Peak flux Band 1.29e-01 9.91e-02 5.07e-02 3.72e-02 2.97e-01 3.34e-01 ph/cm2/s
Error 9.53e-02 4.08e-02 2.03e-02 2.62e-02 1.21e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.557 0.251 - - 6.76e-04 1.34e-04 69.903 57
CPL 1.256 1.208 17.4 12.9 5.34e-03 4.05e-02 67.317 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.004 1.404 - - 1.96e-03 1.61e-03 54.338 57
CPL 2.010 1.409 9995.6 0.0 1.96e-03 0.00e+00 54.338 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 79.136 19.204 98.340
T90 71.576 22.332 93.908
T50 26.864 48.264 75.128
Peak 1.000 72.912 73.912
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
170.2430 -61.9373 0.0266 4.9 -103.8 0.8088 7.3 TRIG_00339162
------------------------------------------
Foreground time interval of the image:
19.204 98.340 (delta_t = 79.136 [sec])
Background time interval of the image:
-134.899 19.204 (delta_t = 154.103 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 19.204 sec. to 98.340 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55689 ( -0.240358 0.261006 )
Norm@50keV : 6.757784E-04 ( -1.332078E-04 1.355534E-04) )
------------------------------------------------------------
Chi-Squared = 69.90266 using 59 PHA bins.
Reduced chi-squared = 1.226362 for 57 degrees of freedom
Null hypothesis probability = 0.117
Photon flux (15-150 keV) in 79.14 sec: 0.137500 ( -0.014702 0.014711 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.43257e-07 ( -7.56206e-08 7.98404e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 19.204 sec. to 98.340 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.25552 ( -1.66987 0.746622 )
Epeak [keV] : 17.4366 ( -17.4266 8.41391 )
Norm@50keV : 5.335186E-03 ( -5.335186E-03 7.572642E-02) )
------------------------------------------------------------
Chi-Squared = 67.31715 using 59 PHA bins.
but latest trial 2.00793 gives Chi-Squared = 17.7047
but latest trial 25.8505 gives Chi-Squared = 2.71866
Reduced chi-squared = 1.202092 for 56 degrees of freedom
Null hypothesis probability = 0.143
Photon flux (15-150 keV) in 79.14 sec: 0.132342 ( -0.014741 0.014702 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.6637e-07 ( -7.12901e-08 1.04362e-07 ) ergs/cm2
Band function
Time interval is from 19.204 sec. to 98.340 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48231 ( -4.65140 2.20124 )
beta : -3.24483 ( -6.75517 0.799892 )
Epeak [keV] : 14.1976 ( -10.7239 74.7860 )
Norm@50keV : 3.824873E-03 ( -94.2368 315.737 )
------------------------------------------------------------
Chi-Squared = 67.00194 using 59 PHA bins.
Reduced chi-squared = 1.218217 for 55 degrees of freedom
Null hypothesis probability = 0.129
Photon flux (15-150 keV) in 79.14 sec: 0.137284 ( -0.014414 0.014662 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.15739e-07 ( -9.35815e-08 8.86487e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 72.912 sec. to 73.912 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00390 ( -1.07182 1.73713 )
Norm@50keV : 1.964975E-03 ( -1.964975E-03 1.259803E-03) )
------------------------------------------------------------
Chi-Squared = 54.33819 using 59 PHA bins.
Reduced chi-squared = 0.9533016 for 57 degrees of freedom
Null hypothesis probability = 0.576
Photon flux (15-150 keV) in 1.000 sec: 0.295816 ( -0.124437 0.122973 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81022e-08 ( -1.09973e-08 1.31305e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 72.912 sec. to 73.912 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00985 ( -1.08146 1.73626 )
Epeak [keV] : 9995.64 ( )
Norm@50keV : 1.963799E-03 ( )
------------------------------------------------------------
Chi-Squared = 54.33796 using 59 PHA bins.
Reduced chi-squared = 0.9703207 for 56 degrees of freedom
Null hypothesis probability = 0.538
Photon flux (15-150 keV) in 1.000 sec: 0.295620 ( -0.124479 0.122941 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8088e-08 ( -1.8088e-08 1.31344e-08 ) ergs/cm2
Band function
Time interval is from 72.912 sec. to 73.912 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.38642 ( -8.61358 6.38642 )
beta : -1.96320 ( -8.03680 1.03107 )
Epeak [keV] : 15.9429 ( -15.8429 9984.06 )
Norm@50keV : 7.178093E-03 ( -7.178093E-03 149.918 )
------------------------------------------------------------
Chi-Squared = 54.34419 using 59 PHA bins.
Reduced chi-squared = 0.9880762 for 55 degrees of freedom
Null hypothesis probability = 0.500
Photon flux (15-150 keV) in 1.000 sec: 0.296674 ( -0.120921 0.12106 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86643e-08 ( -1.86643e-08 8.0873e-09 ) ergs/cm2
Plot creation:
Sun Jan 4 23:18:11 EST 2009