batgrbproduct Analysis for Trigger=305288
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): Mon Mar 10 15:13:58 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger305288/GCN5_download_hand
======================================================================
Trigger: 00305288 Segment: 000
BAT Trigger Time: 226831081.28 [s; MET]
Trigger Stop: 226831082.304 [s; MET]
UTC: 2008-03-10T08:37:58.647300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 220.080833938862 Dec: -0.16550263482074 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.4
Image Trigger?: NO
Rate S/N Ratio: 12.6095202129185 [ if not an image trigger ]
Image S/N Ratio: 7.4
Flight Position: [ source = BAT ]
RA: 220.080833938862 Dec: -0.16550263482074 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 220.039796903704 Dec: -0.163549146031854 [deg; J2000]
{ 14h 40m 09.6s , -00d 09' 48.8" }
+/- 1.43877108650064 [arcmin] (estimated 90% radius based on SNR)
+/- 0.586689267167238 [arcmin] (formal 1-sigma fit error)
SNR: 18.0890579070174
RA = 14h 40m 9.6s (220.039797 deg.)
Dec = -0d 9' 49" (-0.163549 deg.)
Angular difference between Flight and Ground position is 2.465000 arcmin
Partial Coding Fraction: 0.6875 [ including projection effects ]
Duration
T90: 363.460000008345 +/- 17.3987512074303
Measured from: -57.6999999880791
to: 305.760000020266 [s; relative to TRIGTIME]
T50: 249.759999990463 +/- 9.11965899776479
Measured from: -6.46799999475479
to: 243.291999995708 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.27199998497963
to: 2.27199998497963 [s; relative to TRIGTIME]
Total Fluence
Measured from: -71.7639999985695
to: 318.747999995947 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.007432 1.719636 0.711282 0.004004
0.114044 0.105672 0.094368 0.086088 [error]
Peak 0.054222 0.066095 0.026090 0.001203
0.007276 0.006979 0.006009 0.004852 [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 6.63e-07 7.40e-07 5.91e-07 7.83e-07 2.28e-06 2.78e-06 erg/cm2
Error 7.18e-08 5.64e-08 8.76e-08 2.28e-07 1.96e-07 3.29e-07 erg/cm2
Peak flux Power-law 5.70e-01 4.35e-01 2.22e-01 1.63e-01 1.30e+00 1.39e+00 ph/cm2/s
Error 1.12e-01 5.93e-02 4.80e-02 6.66e-02 1.79e-01 1.90e-01 ph/cm2/s
Fluence Cutoff-PL 6.43e-07 7.73e-07 5.59e-07 3.40e-07 2.17e-06 2.31e-06 erg/cm2
Error 7.86e-08 5.57e-08 1.10e-07 4.23e-07 2.47e-07 5.15e-07 erg/cm2
Peak flux Cutoff-PL 5.06e-01 5.02e-01 2.13e-01 3.56e-02 1.25e+00 1.26e+00 ph/cm2/s
Error 1.30e-01 8.80e-02 6.35e-02 7.06e-02 1.85e-01 1.94e-01 ph/cm2/s
Fluence Band 3.38e-06 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 Band 4.97e-01 5.13e-01 2.03e-01 7.60e-02 1.25e+00 1.29e+00 ph/cm2/s
Error 1.30e-01 7.93e-02 4.98e-02 8.33e-02 1.80e-01 2.01e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.325 0.161 - - 6.09e-04 6.42e-05 44.377 57
CPL 1.945 0.522 5.5 14.5 1.04e-03 1.61e-03 43.043 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.971 0.245 - - 8.79e-03 1.46e-03 54.711 57
CPL 0.669 1.454 41.9 17.5 5.04e-02 2.60e-01 51.162 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: 12.864000 sec.
T50 in the 50-300 keV band: 7.616000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 390.512 -71.764 318.748
T90 363.460 -57.700 305.760
T50 249.760 -6.468 243.292
Peak 1.000 1.272 2.272
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
220.0398 -0.1635 0.0106 27.8 158.2 2.2039 18.1 TRIG_00305288
------------------------------------------
Foreground time interval of the image:
-53.179 18.021 (delta_t = 71.200 [sec])
Background time interval of the image:
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 -71.764 sec. to 318.748 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.32456 ( -0.158125 0.164499 )
Norm@50keV : 6.089675E-04 ( -6.462034E-05 6.374565E-05) )
------------------------------------------------------------
Chi-Squared = 44.37689 using 59 PHA bins.
Reduced chi-squared = 0.7785419 for 57 degrees of freedom
Null hypothesis probability = 0.889
Photon flux (15-150 keV) in 390.5 sec: 0.107895 ( -0.00818662 0.008201 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28302e-06 ( -1.94692e-07 1.98179e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -71.764 sec. to 318.748 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94471 ( -0.808017 0.235134 )
Epeak [keV] : 5.54712 ( -4.94662 24.0672 )
Norm@50keV : 1.035366E-03 ( -1.035366E-03 2.176780E-03) )
------------------------------------------------------------
Chi-Squared = 43.04333 using 59 PHA bins.
but latest trial 1.10736 gives Chi-Squared = 6.599808E-02
Reduced chi-squared = 0.7686310 for 56 degrees of freedom
Null hypothesis probability = 0.898
Photon flux (15-150 keV) in 390.5 sec: 0.105647 ( -0.00882463 0.008757 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17023e-06 ( -2.42899e-07 2.51576e-07 ) ergs/cm2
Band function
Time interval is from -71.764 sec. to 318.748 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.61526 ( -5.84130 1.63199 )
beta : -9.34372 ( -0.214025 0.195726 )
Epeak [keV] : 20.5515 ( -6.21696 4.45449 )
Norm@50keV : 1.635296E-03 ( -21.3093 100.690 )
------------------------------------------------------------
Chi-Squared = 43.47527 using 59 PHA bins.
Reduced chi-squared = 0.7904595 for 55 degrees of freedom
Null hypothesis probability = 0.869
Photon flux (15-150 keV) in 390.5 sec: 0.105637 ( -0.00881423 0.00881 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.272 sec. to 2.272 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97106 ( -0.237387 0.252726 )
Norm@50keV : 8.790884E-03 ( -1.477371E-03 1.439631E-03) )
------------------------------------------------------------
Chi-Squared = 54.71109 using 59 PHA bins.
Reduced chi-squared = 0.9598438 for 57 degrees of freedom
Null hypothesis probability = 0.561
Photon flux (15-150 keV) in 1.000 sec: 1.30140 ( -0.17851 0.1786 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.09215e-08 ( -1.27937e-08 1.31729e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.272 sec. to 2.272 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.669062 ( -1.71703 1.19073 )
Epeak [keV] : 41.9152 ( -7.59269 27.3479 )
Norm@50keV : 5.044890E-02 ( -3.996091E-02 0.480989 )
------------------------------------------------------------
Chi-Squared = 51.16166 using 59 PHA bins.
but latest trial 27.0553 gives Chi-Squared = 4.26469
Reduced chi-squared = 0.9136010 for 56 degrees of freedom
Null hypothesis probability = 0.658
Photon flux (15-150 keV) in 1.000 sec: 1.25153 ( -0.18535 0.18487 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.24946e-08 ( -1.37072e-08 1.49976e-08 ) ergs/cm2
Band function
Time interval is from 1.272 sec. to 2.272 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.645017 ( -1.18886 3.18162 )
beta : -2.59756 ( -7.40244 0.649872 )
Epeak [keV] : 42.0377 ( -19.4475 24.7617 )
Norm@50keV : 5.181197E-02 ( -0.268671 288.907 )
------------------------------------------------------------
Chi-Squared = 51.04560 using 59 PHA bins.
Reduced chi-squared = 0.9281019 for 55 degrees of freedom
Null hypothesis probability = 0.626
Photon flux (15-150 keV) in 1.000 sec: 1.25466 ( -0.18433 0.17474 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.43308e-08 ( -1.3523e-08 1.26736e-08 ) ergs/cm2
Plot creation:
Mon Mar 10 20:41:14 EDT 2008