batgrbproduct Analysis for Trigger=164279
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 v2.41
Process Start Time (local time): Wed Jan 9 19:03:37 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger164279/SDC
======================================================================
Trigger: 00164279 Segment: 000
BAT Trigger Time: 153926574.272 [s; MET]
Trigger Stop: 153926579.776 [s; MET]
UTC: 2005-11-17T13:22:54.427080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 85.2253223997025 Dec: -19.2449527944692 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.47
Image Trigger?: NO
Rate S/N Ratio: 12.8452325786651 [ if not an image trigger ]
Image S/N Ratio: 6.47
Flight Position: [ source = BAT ]
RA: 85.2253223997025 Dec: -19.2449527944692 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 85.2070808884482 Dec: -19.2868468003355 [deg; J2000]
{ 05h 40m 49.7s , -19d 17' 12.6" }
+/- 2.4578209322421 [arcmin] (estimated 90% radius based on SNR)
+/- 1.26912474858949 [arcmin] (formal 1-sigma fit error)
SNR: 8.41762293373102
RA = 5h 40m 49.7s (85.207081 deg.)
Dec = -19d 17' 13" (-19.286847 deg.)
Angular difference between Flight and Ground position is 2.717698 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 9.00800001621246 +/- 1.32579487698369
Measured from: 1.51599997282028
to: 10.5239999890327 [s; relative to TRIGTIME]
T50: 4.81999999284744 +/- 2.49676029072655
Measured from: 2.64399999380112
to: 7.46399998664856 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.43999999761581
to: 2.43999999761581 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.38799998164177
to: 10.9959999918938 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.064915 0.120262 0.086167 0.017113
0.017449 0.017889 0.015996 0.013708 [error]
Peak 0.016838 0.021258 0.018703 0.005452
0.005708 0.005938 0.005327 0.004622 [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 2.46e-08 4.44e-08 6.17e-08 1.79e-07 1.77e-07 3.09e-07 erg/cm2
Error 7.16e-09 8.33e-09 1.50e-08 9.08e-08 3.66e-08 1.04e-07 erg/cm2
Peak flux Power-law 1.54e-01 1.61e-01 1.19e-01 1.42e-01 4.89e-01 5.76e-01 ph/cm2/s
Error 7.14e-02 4.92e-02 4.13e-02 9.72e-02 1.42e-01 1.68e-01 ph/cm2/s
Fluence Cutoff-PL 2.09e-08 4.97e-08 6.57e-08 5.09e-08 1.67e-07 1.86e-07 erg/cm2
Error 8.41e-09 1.07e-08 1.78e-08 5.30e-08 3.83e-08 1.09e-07 erg/cm2
Peak flux Cutoff-PL 7.07e-02 1.88e-01 1.53e-01 2.21e-02 4.31e-01 4.34e-01 ph/cm2/s
Error 8.87e-02 6.77e-02 5.82e-02 5.33e-02 1.43e-01 1.50e-01 ph/cm2/s
Fluence Band 2.08e-08 4.95e-08 6.56e-08 5.10e-08 1.67e-07 1.88e-07 erg/cm2
Error 6.21e-09 1.06e-08 1.78e-08 8.80e-08 3.82e-08 1.07e-07 erg/cm2
Peak flux Band 7.92e-02 1.91e-01 1.50e-01 2.26e-02 4.34e-01 4.41e-01 ph/cm2/s
Error 6.03e-02 6.31e-02 4.41e-02 6.43e-02 1.18e-01 1.35e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.527 0.305 - - 1.95e-03 3.70e-04 60.878 57
CPL 0.499 1.363 72.1 4974.7 6.56e-03 1.90e-02 58.555 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.439 0.457 - - 3.98e-03 1.16e-03 62.497 57
CPL -1.704 2.048 62.8 43.9 1.16e-01 1.86e-01 58.531 0
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 9.608 1.388 10.996
T90 9.008 1.516 10.524
T50 4.820 2.644 7.464
Peak 1.000 1.440 2.440
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
85.2071 -19.2868 0.0229 29.7 166.3 0.2958 8.4 TRIG_00164279
------------------------------------------
Foreground time interval of the image:
1.388 10.996 (delta_t = 9.608 [sec])
Background time interval of the image:
-141.371 1.388 (delta_t = 142.759 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.388 sec. to 10.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52658 ( -0.302272 0.308528 )
Norm@50keV : 1.953254E-03 ( -3.723609E-04 3.680636E-04) )
------------------------------------------------------------
Chi-Squared = 60.87849 using 59 PHA bins.
Reduced chi-squared = 1.068044 for 57 degrees of freedom
Null hypothesis probability = 0.338
Photon flux (15-150 keV) in 9.608 sec: 0.245624 ( -0.04526 0.045343 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77316e-07 ( -3.62654e-08 3.69418e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.388 sec. to 10.996 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.498502 ( -1.54952 1.17667 )
Epeak [keV] : 72.1266 ( -21.5403 9927.87 )
Norm@50keV : 6.564897E-03 ( -6.564897E-03 3.140962E-02) )
------------------------------------------------------------
Chi-Squared = 58.55473 using 59 PHA bins.
but latest trial 1.43047 gives Chi-Squared = 2.02054
but latest trial 42.1792 gives Chi-Squared = 6.23073
Reduced chi-squared = 1.045620 for 56 degrees of freedom
Null hypothesis probability = 0.382
Photon flux (15-150 keV) in 9.608 sec: 0.237557 ( -0.046254 0.046325 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66677e-07 ( -3.74558e-08 3.90844e-08 ) ergs/cm2
Band function
Time interval is from 1.388 sec. to 10.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.500517 ( -9.49948 0.771000 )
beta : -8.94498 ( -1.05502 7.55948 )
Epeak [keV] : 72.1552 ( -21.7695 9927.84 )
Norm@50keV : 6.548919E-03 ( -6.548919E-03 3.145689E-02) )
------------------------------------------------------------
Chi-Squared = 58.55485 using 59 PHA bins.
Reduced chi-squared = 1.064634 for 55 degrees of freedom
Null hypothesis probability = 0.346
Photon flux (15-150 keV) in 9.608 sec: 0.237599 ( -0.046289 0.046284 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66613e-07 ( -3.74385e-08 3.90046e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.440 sec. to 2.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43885 ( -0.451786 0.462919 )
Norm@50keV : 3.979044E-03 ( -1.159647E-03 1.151753E-03) )
------------------------------------------------------------
Chi-Squared = 62.49677 using 59 PHA bins.
Reduced chi-squared = 1.096435 for 57 degrees of freedom
Null hypothesis probability = 0.287
Photon flux (15-150 keV) in 1.000 sec: 0.489047 ( -0.141471 0.142095 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.81979e-08 ( -1.19158e-08 1.21672e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.440 sec. to 2.440 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.70425 ( -1.29575 2.80047 )
Epeak [keV] : 62.7723 ( -14.1390 73.7475 )
Norm@50keV : 0.115550 ( -0.115550 0.255548 )
------------------------------------------------------------
Chi-Squared = 58.53135 using 59 PHA bins.
but latest trial 0.415692 gives Chi-Squared = 8.58387
Reduced chi-squared = 1.045203 for 56 degrees of freedom
Null hypothesis probability = 0.383
Photon flux (15-150 keV) in 1.000 sec: 0.431265 ( -0.128118 0.158293 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.38763e-08 ( -1.05852e-08 1.2706e-08 ) ergs/cm2
Band function
Time interval is from 1.440 sec. to 2.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.84528 ( -2.32358 3.15472 )
beta : -9.32419 ( -1.239777E-05 0.675577 )
Epeak [keV] : 65.3787 ( -14.2439 73.6512 )
Norm@50keV : 0.116806 ( -0.125147 1.27985 )
------------------------------------------------------------
Chi-Squared = 58.63051 using 59 PHA bins.
Reduced chi-squared = 1.066009 for 55 degrees of freedom
Null hypothesis probability = 0.344
Photon flux (15-150 keV) in 1.000 sec: 0.433514 ( -0.11682 0.118778 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36898e-08 ( -9.7166e-09 9.5049e-09 ) ergs/cm2
Plot creation:
Wed Jan 9 19:17:37 EST 2008