batgrbproduct Analysis for Trigger=302728
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): Fri Feb 8 05:51:06 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger302728/GCN5_download_cron
======================================================================
Trigger: 00302728 Segment: 000
BAT Trigger Time: 224112624 [s; MET]
Trigger Stop: 224112688 [s; MET]
UTC: 2008-02-07T21:30:21.441560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 207.513016835087 Dec: 7.5139985942329 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.83
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 15.83
Flight Position: [ source = BAT ]
RA: 207.513016835087 Dec: 7.5139985942329 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 207.513911604261 Dec: 7.49221476725538 [deg; J2000]
{ 13h 50m 03.3s , +07d 29' 32.0" }
+/- 1.15879377771946 [arcmin] (estimated 90% radius based on SNR)
+/- 0.420171364647262 [arcmin] (formal 1-sigma fit error)
SNR: 24.642287284491
RA = 13h 50m 3.3s (207.513912 deg.)
Dec = 7d 29' 32" (7.492215 deg.)
Angular difference between Flight and Ground position is 1.308113 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 292.752000004053 +/- 7.87617066582308
Measured from: 30.4160000085831
to: 323.168000012636 [s; relative to TRIGTIME]
T50: 106.696000009775 +/- 19.7260300218472
Measured from: 76.3519999980927
to: 183.048000007868 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 330.33599999547
to: 331.33599999547 [s; relative to TRIGTIME]
Total Fluence
Measured from: 4.6879999935627
to: 332.891999989748 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.098389 4.064672 2.832286 0.513267
0.097021 0.097854 0.086498 0.073260 [error]
Peak 0.021628 0.048485 0.040792 0.021941
0.012136 0.012392 0.011450 0.008577 [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 9.28e-07 1.62e-06 2.16e-06 5.90e-06 6.30e-06 1.06e-05 erg/cm2
Error 5.89e-08 5.80e-08 8.84e-08 5.59e-07 2.11e-07 6.05e-07 erg/cm2
Peak flux Power-law 2.34e-01 3.02e-01 2.86e-01 4.77e-01 9.82e-01 1.30e+00 ph/cm2/s
Error 1.30e-01 1.03e-01 8.58e-02 3.19e-01 2.78e-01 3.81e-01 ph/cm2/s
Fluence Cutoff-PL 8.50e-07 1.66e-06 2.22e-06 3.63e-06 6.12e-06 8.35e-06 erg/cm2
Error 7.70e-08 6.42e-08 9.87e-08 1.18e-06 2.42e-07 1.20e-06 erg/cm2
Peak flux Cutoff-PL 2.21e-01 3.08e-01 2.95e-01 3.73e-01 9.75e-01 1.20e+00 ph/cm2/s
Error 1.49e-01 1.13e-01 1.03e-01 3.96e-01 2.82e-01 4.73e-01 ph/cm2/s
Fluence Band 8.41e-07 1.65e-06 2.21e-06 3.61e-06 6.12e-06 8.33e-06 erg/cm2
Error 7.63e-08 6.39e-08 9.85e-08 1.18e-06 2.43e-07 1.20e-06 erg/cm2
Peak flux Band 2.21e-01 3.07e-01 2.95e-01 3.73e-01 9.75e-01 1.19e+00 ph/cm2/s
Error 1.49e-01 1.13e-01 1.04e-01 3.89e-01 2.82e-01 4.50e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.583 0.062 - - 2.05e-03 6.47e-05 57.734 57
CPL 1.173 0.268 107.8 72.5 3.18e-03 8.81e-04 51.313 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.081 0.498 - - 8.48e-03 2.33e-03 45.055 57
CPL 0.838 2.184 271.1 5000.0 1.10e-02 5.00e+23 45.000 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: 261.504000 sec.
T50 in the 50-300 keV band: 93.312000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 328.204 4.688 332.892
T90 292.752 30.416 323.168
T50 106.696 76.352 183.048
Peak 1.000 330.336 331.336
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
207.5139 +7.4922 0.0078 10.1 -1.6 2.4099 24.6 TRIG_00302728
------------------------------------------
Foreground time interval of the image:
4.688 73.501 (delta_t = 68.813 [sec])
Background time interval of the image:
-132.599 4.688 (delta_t = 137.287 [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 4.688 sec. to 332.892 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58350 ( -6.240177E-02 6.255567E-02) )
Norm@50keV : 2.046852E-03 ( -6.472808E-05 6.468571E-05) )
------------------------------------------------------------
Chi-Squared = 57.73422 using 59 PHA bins.
Reduced chi-squared = 1.012881 for 57 degrees of freedom
Null hypothesis probability = 0.448
Photon flux (15-150 keV) in 328.2 sec: 0.261704 ( -0.009143 0.009183 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.29524e-06 ( -2.10114e-07 2.11262e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.688 sec. to 332.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17285 ( -0.245323 0.290875 )
Epeak [keV] : 107.813 ( -21.7244 123.233 )
Norm@50keV : 3.176462E-03 ( -8.338257E-04 9.287789E-04) )
------------------------------------------------------------
Chi-Squared = 51.31349 using 59 PHA bins.
Reduced chi-squared = 0.9163123 for 56 degrees of freedom
Null hypothesis probability = 0.653
Photon flux (15-150 keV) in 328.2 sec: 0.254006 ( -0.01037 0.010416 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1226e-06 ( -2.43984e-07 2.40997e-07 ) ergs/cm2
Band function
Time interval is from 4.688 sec. to 332.892 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17686 ( -0.287226 0.248992 )
beta : -9.14790 ( -0.852097 7.49012 )
Epeak [keV] : 108.348 ( -22.2566 122.360 )
Norm@50keV : 3.162000E-03 ( -8.187508E-04 9.411483E-04) )
------------------------------------------------------------
Chi-Squared = 51.30459 using 59 PHA bins.
Reduced chi-squared = 0.9328107 for 55 degrees of freedom
Null hypothesis probability = 0.617
Photon flux (15-150 keV) in 328.2 sec: 0.254012 ( -0.010377 0.010419 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.11693e-06 ( -2.43492e-07 2.41982e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 330.336 sec. to 331.336 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08120 ( -0.516118 0.479198 )
Norm@50keV : 8.480133E-03 ( -2.338345E-03 2.315976E-03) )
------------------------------------------------------------
Chi-Squared = 45.05495 using 59 PHA bins.
Reduced chi-squared = 0.7904378 for 57 degrees of freedom
Null hypothesis probability = 0.874
Photon flux (15-150 keV) in 1.000 sec: 0.981922 ( -0.276489 0.278578 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.91887e-08 ( -2.61478e-08 2.65363e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 330.336 sec. to 331.336 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.837674 ( -2.49461 1.87414 )
Epeak [keV] : 271.062 ( -271.052 9728.94 )
Norm@50keV : 1.095760E-02 ( -4.750411E-03 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 45.00040 using 59 PHA bins.
but latest trial 1.72445 gives Chi-Squared = 4.78150
Reduced chi-squared = 0.8035785 for 56 degrees of freedom
Null hypothesis probability = 0.854
Photon flux (15-150 keV) in 1.000 sec: 0.974693 ( -0.282274 0.280957 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.84296e-08 ( -2.7933e-08 2.70384e-08 ) ergs/cm2
Band function
Time interval is from 330.336 sec. to 331.336 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.582269 ( -9.41773 5.58227 )
beta : -1.15545 ( -8.84455 0.584206 )
Epeak [keV] : 113.785 ( -113.685 9886.21 )
Norm@50keV : 1.635015E-02 ( -160.923 51.6514 )
------------------------------------------------------------
Chi-Squared = 44.99861 using 59 PHA bins.
Reduced chi-squared = 0.8181565 for 55 degrees of freedom
Null hypothesis probability = 0.830
Photon flux (15-150 keV) in 1.000 sec: 0.974709 ( -0.282255 0.282281 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.83991e-08 ( -2.75937e-08 2.70169e-08 ) ergs/cm2
Plot creation:
Fri Feb 8 06:29:59 EST 2008