batgrbproduct Analysis for Trigger=341965
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): Wed Feb 4 03:21:50 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger341965/GCN5_download_cron
======================================================================
Trigger: 00341965 Segment: 000
BAT Trigger Time: 255384043.996 [s; MET]
Trigger Stop: 255384044.028 [s; MET]
UTC: 2009-02-03T20:00:39.526400 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 237.702063999437 Dec: -54.3017906295429 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 25.32
Image Trigger?: NO
Rate S/N Ratio: 255.998046867549 [ if not an image trigger ]
Image S/N Ratio: 25.32
Flight Position: [ source = BAT ]
RA: 237.702063999437 Dec: -54.3017906295429 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 237.718746360603 Dec: -54.3096899474694 [deg; J2000]
{ 15h 50m 52.5s , -54d 18' 34.9" }
+/- 0.513823909366587 [arcmin] (estimated 90% radius based on SNR)
+/- 0.177852223949654 [arcmin] (formal 1-sigma fit error)
SNR: 78.7482290047272
Angular difference between Flight and Ground position is 0.752133 arcmin
Partial Coding Fraction: 0.4921875 [ including projection effects ]
Duration
T90: 0.183999985456467 +/- 0.0239999890327454
Measured from: -0.0479998886585236
to: 0.136000096797943 [s; relative to TRIGTIME]
T50: 0.0399999916553497 +/- 0.004
Measured from: -0.0239998996257782
to: 0.0160000920295715 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.343999981880188
to: 0.656000018119812 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0839999914169312
to: 0.392000019550323 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.227931 3.208199 0.738834 0.018116
0.033718 0.033180 0.016628 0.005275 [error]
Peak 3.227578 3.207221 0.738821 0.018193
0.033724 0.033184 0.016629 0.005296 [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 1.75e-06 1.20e-06 5.37e-07 3.34e-07 3.65e-06 3.81e-06 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 Power-law 1.22e+02 4.70e+01 1.06e+01 2.85e+00 1.81e+02 1.82e+02 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
Fluence Cutoff-PL 9.57e-07 1.51e-06 5.88e-07 3.70e-08 3.19e-06 2.93e-06 erg/cm2
Error 3.61e-08 2.17e-08 6.90e-09 8.56e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 7.09e+01 5.76e+01 1.22e+01 4.21e-01 1.41e+02 1.41e+02 ph/cm2/s
Error 4.62e+00 1.38e+00 4.17e-01 7.55e-02 5.14e+00 5.15e+00 ph/cm2/s
Fluence Band 1.09e-06 1.50e-06 5.87e-07 4.76e-08 3.19e-06 3.21e-06 erg/cm2
Error 2.09e-08 7.19e-08 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 7.10e+01 5.77e+01 1.21e+01 5.70e-01 1.41e+02 1.44e+02 ph/cm2/s
Error 4.44e+00 1.24e+00 4.09e-01 1.91e-01 3.81e+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 3.158 0.000 - - 5.91e-01 0.00e+00 681.176 57
CPL 0.084 0.269 28.6 1.6 2.47e+01 8.25e+00 33.273 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.156 0.000 - - 5.87e-01 0.00e+00 677.811 57
CPL 0.091 0.269 28.6 1.6 2.43e+01 8.11e+00 33.330 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: 0.192000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.476 -0.084 0.392
T90 0.184 -0.048 0.136
T50 0.040 -0.024 0.016
Peak 1.000 -0.344 0.656
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
237.7187 -54.3097 0.0024 35.5 -132.4 7.4150 78.7 TRIG_00341965
------------------------------------------
Foreground time interval of the image:
-0.084 0.392 (delta_t = 0.476 [sec])
Background time interval of the image:
-219.495 -0.084 (delta_t = 219.411 [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 -0.084 sec. to 0.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.15762 ( )
Norm@50keV : 0.591285 ( )
------------------------------------------------------------
Chi-Squared = 681.1763 using 59 PHA bins.
Reduced chi-squared = 11.95046 for 57 degrees of freedom
Null hypothesis probability = 0.00
Photon flux (15-150 keV) in 0.4760 sec: 182.765 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65108e-06 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.084 sec. to 0.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 8.387052E-02 ( -0.275037 0.263527 )
Epeak [keV] : 28.5935 ( -1.65028 1.45968 )
Norm@50keV : 24.7388 ( -6.73011 9.77456 )
------------------------------------------------------------
Chi-Squared = 33.27274 using 59 PHA bins.
Reduced chi-squared = 0.5941561 for 56 degrees of freedom
Null hypothesis probability = 0.993
Photon flux (15-150 keV) in 0.4760 sec: 142.227 ( -5.142 5.234 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.1918e-06 ( -8.50926e-08 8.60237e-08 ) ergs/cm2
Band function
Time interval is from -0.084 sec. to 0.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28957 ( -2.465165E-02 4.203415E-02) )
beta : -9.37167 ( -0.628329 19.3714 )
Epeak [keV] : 18.1100 ( -2.27489 1.13003 )
Norm@50keV : 5.57402 ( -8.12517 14.3758 )
------------------------------------------------------------
Chi-Squared = 105.4563 using 59 PHA bins.
Reduced chi-squared = 1.917387 for 55 degrees of freedom
Null hypothesis probability = 5.059E-05
Photon flux (15-150 keV) in 0.4760 sec: 141.667 ( -3.98 3.657 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.18854e-06 ( -7.18298e-08 7.1877e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.81050
R^2/D10^2 : 107.277
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 127.1191 using 59 PHA bins.
Reduced chi-squared = 2.230160 for 57 degrees of freedom
Null hypothesis probability = 2.905E-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.630e-07 3.111e-08
25- 50 1.568e-06 3.639e-08
50-150 5.603e-07 2.328e-08
15-150 2.891e-06 6.626e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.3665 -0.6992 0.7173
Norm : 1497.01 -65.7 69.13
------------------------------------------------------------
Chi-Squared = 110.6239 using 59 PHA bins.
Reduced chi-squared = 1.940770 for 57 degrees of freedom
Null hypothesis probability = 2.706E-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.349e-06 4.336e-08
25- 50 1.430e-06 2.935e-08
50-150 6.566e-07 2.468e-08
15-150 3.436e-06 7.173e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.73655 -1.07367 1.03124
R1^2/D10^2 : 351.424 -127.062 369.48
kT2 [keV] : 10.7484 -0.78386 1.3689
R2^2/D10^2 : 28.5462 -17.038 20.3994
------------------------------------------------------------
Chi-Squared = 37.79676 using 59 PHA bins.
Reduced chi-squared = 0.6872138 for 55 degrees of freedom
Null hypothesis probability = 0.963
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.010e-06 1.067e-07
25- 50 1.513e-06 1.350e-07
50-150 6.208e-07 7.190e-08
15-150 3.144e-06 3.047e-07
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.084 sec. to 0.396 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.15598 ( )
Norm@50keV : 0.586840 ( )
------------------------------------------------------------
Chi-Squared = 677.8105 using 59 PHA bins.
Reduced chi-squared = 11.89141 for 57 degrees of freedom
Null hypothesis probability = 0.00
Photon flux (15-150 keV) in 0.4800 sec: 181.182 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.651e-06 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.084 sec. to 0.396 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 9.079535E-02 ( -0.275766 0.262764 )
Epeak [keV] : 28.5695 ( -1.65263 1.46814 )
Norm@50keV : 24.2972 ( -6.59390 9.63036 )
------------------------------------------------------------
Chi-Squared = 33.33035 using 59 PHA bins.
Reduced chi-squared = 0.5951847 for 56 degrees of freedom
Null hypothesis probability = 0.993
Photon flux (15-150 keV) in 0.4800 sec: 141.057 ( -5.102 5.188 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.19206e-06 ( -8.50997e-08 8.60573e-08 ) ergs/cm2
Band function
Time interval is from -0.084 sec. to 0.396 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28931 ( -2.546179E-02 4.078078E-02) )
beta : -9.37167 ( -0.628329 3.94672 )
Epeak [keV] : 18.1148 ( -1.57301 1.76944 )
Norm@50keV : 5.50222 ( -9.96751 12.7992 )
------------------------------------------------------------
Chi-Squared = 104.9728 using 59 PHA bins.
Reduced chi-squared = 1.908596 for 55 degrees of freedom
Null hypothesis probability = 5.728E-05
Photon flux (15-150 keV) in 0.4800 sec: 140.570 ( -3.939 3.675 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20517e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.81209
R^2/D10^2 : 106.276
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 127.7225 using 59 PHA bins.
Reduced chi-squared = 2.240745 for 57 degrees of freedom
Null hypothesis probability = 2.439E-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.626e-07 2.928e-08
25- 50 1.568e-06 3.816e-08
50-150 5.604e-07 2.246e-08
15-150 2.891e-06 6.617e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.3880 -0.698 0.7214
Norm : 1482.83 -65.44 68.14
------------------------------------------------------------
Chi-Squared = 109.8660 using 59 PHA bins.
Reduced chi-squared = 1.927474 for 57 degrees of freedom
Null hypothesis probability = 3.292E-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.348e-06 4.483e-08
25- 50 1.430e-06 3.062e-08
50-150 6.573e-07 2.590e-08
15-150 3.436e-06 7.313e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.76799 -1.08087 1.02767
R1^2/D10^2 : 343.540 -122.884 358.028
kT2 [keV] : 10.7860 -0.80228 1.4032
R2^2/D10^2 : 27.6191 -16.6723 20.3162
------------------------------------------------------------
Chi-Squared = 37.95208 using 59 PHA bins.
Reduced chi-squared = 0.6900378 for 55 degrees of freedom
Null hypothesis probability = 0.961
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.008e-06 1.334e-07
25- 50 1.513e-06 1.181e-07
50-150 6.212e-07 6.763e-08
15-150 3.142e-06 2.646e-07
Plot creation:
Wed Feb 4 03:49:51 EST 2009