batgrbproduct Analysis for Trigger=335105
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 Nov 23 08:50:53 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger335105/SDC
======================================================================
Trigger: 00335105 Segment: 000
BAT Trigger Time: 248992536.128 [s; MET]
Trigger Stop: 248992540.224 [s; MET]
UTC: 2008-11-21T20:35:32.854060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 89.2636966592357 Dec: -60.6257043407029 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.79
Image Trigger?: NO
Rate S/N Ratio: 39.319206502675 [ if not an image trigger ]
Image S/N Ratio: 9.79
Flight Position: [ source = BAT ]
RA: 89.2636966592357 Dec: -60.6257043407029 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 89.2736111961864 Dec: -60.6113415653543 [deg; J2000]
{ 05h 57m 05.7s , -60d 36' 40.8" }
+/- 1.35992790816879 [arcmin] (estimated 90% radius based on SNR)
+/- 0.557633645797289 [arcmin] (formal 1-sigma fit error)
SNR: 19.6056569568394
Angular difference between Flight and Ground position is 0.909847 arcmin
Partial Coding Fraction: 0.05078125 [ including projection effects ]
Duration
T90: 17.5039999485016 +/- 1.99410331775215
Measured from: -3.41599997878075
to: 14.0879999697208 [s; relative to TRIGTIME]
T50: 8.87999996542931 +/- 1.57752210275851
Measured from: 0.664000004529953
to: 9.54399996995926 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 13.6040000021458
to: 14.6040000021458 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.30399999022484
to: 14.4560000002384 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.964730 1.964649 2.373657 0.893986
0.128805 0.136409 0.134079 0.107524 [error]
Peak 0.083572 0.149302 0.183024 0.084428
0.025815 0.029614 0.031154 0.023414 [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 4.65e-07 1.03e-06 1.81e-06 7.42e-06 4.96e-06 1.02e-05 erg/cm2
Error 6.45e-08 8.77e-08 1.25e-07 1.13e-06 3.29e-07 0.00e+00 erg/cm2
Peak flux Power-law 1.68e+00 1.46e+00 8.69e-01 7.76e-01 4.35e+00 4.79e+00 ph/cm2/s
Error 6.51e-01 3.87e-01 2.50e-01 4.09e-01 1.14e+00 1.19e+00 ph/cm2/s
Fluence Cutoff-PL 3.89e-07 1.06e-06 1.97e-06 3.96e-06 4.91e-06 6.84e-06 erg/cm2
Error 8.20e-08 9.57e-08 1.69e-07 1.85e-06 3.36e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 6.69e-01 1.96e+00 1.37e+00 1.15e-01 4.11e+00 4.11e+00 ph/cm2/s
Error 4.09e-01 5.09e-01 3.60e-01 1.19e-01 9.79e-01 9.82e-01 ph/cm2/s
Fluence Band 3.86e-07 1.06e-06 1.96e-06 3.96e-06 4.90e-06 7.14e-06 erg/cm2
Error 8.13e-08 9.55e-08 1.69e-07 1.85e-06 3.36e-07 0.00e+00 erg/cm2
Peak flux Band 9.21e-01 1.97e+00 1.36e+00 1.83e-01 4.19e+00 4.33e+00 ph/cm2/s
Error 5.70e-01 5.65e-01 3.75e-01 2.09e-01 1.01e+00 1.19e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.192 0.111 - - 2.47e-02 1.68e-03 61.096 57
CPL 0.563 0.500 140.3 126.8 4.52e-02 2.23e-02 55.786 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.750 0.361 - - 3.21e-02 8.03e-03 82.316 57
CPL -2.441 0.000 56.8 8.0 3.10e+00 3.55e+00 73.020 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: 16.832000 sec.
T50 in the 50-300 keV band: 9.280000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.760 -5.304 14.456
T90 17.504 -3.416 14.088
T50 8.880 0.664 9.544
Peak 1.000 13.604 14.604
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
89.2736 -60.6113 0.0097 57.7 -9.3 6.6268 19.6 TRIG_00335105
------------------------------------------
Foreground time interval of the image:
-5.304 14.456 (delta_t = 19.760 [sec])
Background time interval of the image:
-144.123 -5.304 (delta_t = 138.819 [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 -5.304 sec. to 14.456 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19181 ( -0.111436 0.109579 )
Norm@50keV : 2.466474E-02 ( -1.681719E-03 1.673836E-03) )
------------------------------------------------------------
Chi-Squared = 61.09561 using 59 PHA bins.
Reduced chi-squared = 1.071853 for 57 degrees of freedom
Null hypothesis probability = 0.331
Photon flux (15-150 keV) in 19.76 sec: 2.89184 ( -0.21252 0.21377 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.95658e-06 ( -3.2934e-07 3.28648e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.304 sec. to 14.456 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.562977 ( -0.528718 0.472039 )
Epeak [keV] : 140.335 ( -37.7454 215.785 )
Norm@50keV : 4.515471E-02 ( -1.619183E-02 2.831648E-02) )
------------------------------------------------------------
Chi-Squared = 55.78638 using 59 PHA bins.
Reduced chi-squared = 0.9961854 for 56 degrees of freedom
Null hypothesis probability = 0.483
Photon flux (15-150 keV) in 19.76 sec: 2.80967 ( -0.21834 0.22025 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.90726e-06 ( -3.37639e-07 3.35307e-07 ) ergs/cm2
Band function
Time interval is from -5.304 sec. to 14.456 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.382504E-02 ( -0.908499 3.77829 )
beta : -1.46992 ( -8.53008 0.262715 )
Epeak [keV] : 84.5844 ( -50.0985 218.883 )
Norm@50keV : 9.069004E-02 ( -6.066253E-02 176.232 )
------------------------------------------------------------
Chi-Squared = 55.35201 using 59 PHA bins.
Reduced chi-squared = 1.006400 for 55 degrees of freedom
Null hypothesis probability = 0.461
Photon flux (15-150 keV) in 19.76 sec: 2.76045 ( -0.22033 0.34769 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.90469e-06 ( -3.37264e-07 3.35288e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 13.736 sec. to 14.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75034 ( -0.352910 0.369093 )
Norm@50keV : 3.214721E-02 ( -8.049037E-03 8.015588E-03) )
------------------------------------------------------------
Chi-Squared = 82.31635 using 59 PHA bins.
Reduced chi-squared = 1.444147 for 57 degrees of freedom
Null hypothesis probability = 1.576E-02
Photon flux (15-150 keV) in 0.7360 sec: 4.34720 ( -1.13918 1.14887 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18309e-07 ( -5.51146e-08 5.54237e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.736 sec. to 14.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.44124 ( )
Epeak [keV] : 56.7617 ( -7.75959 8.14314 )
Norm@50keV : 3.09559 ( -2.44278 4.65066 )
------------------------------------------------------------
Chi-Squared = 73.01964 using 59 PHA bins.
Reduced chi-squared = 1.303922 for 56 degrees of freedom
Null hypothesis probability = 6.291E-02
Photon flux (15-150 keV) in 0.7360 sec: 4.11076 ( -0.93854 1.01943 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24239e-07 ( -5.20588e-08 5.30509e-08 ) ergs/cm2
Band function
Time interval is from 13.736 sec. to 14.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.961275 ( -3.62088 1.16589 )
beta : -2.77982 ( -3.97478 15.8784 )
Epeak [keV] : 76.7184 ( -13.5618 6.51244 )
Norm@50keV : 7.569059E-02 ( -6.88905 33.1451 )
------------------------------------------------------------
Chi-Squared = 79.56213 using 59 PHA bins.
Reduced chi-squared = 1.446584 for 55 degrees of freedom
Null hypothesis probability = 1.681E-02
Photon flux (15-150 keV) in 0.7360 sec: 4.19438 ( -1.08853 0.94046 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22792e-07 ( -5.17018e-08 4.98537e-08 ) ergs/cm2
Plot creation:
Sun Nov 23 09:25:34 EST 2008