batgrbproduct Analysis for Trigger=118749
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): Sat Jan 5 02:25:55 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger118749/GCN5_download_hand
======================================================================
Trigger: 00118749 Segment: 000
BAT Trigger Time: 137304018.752 [s; MET]
Trigger Stop: 137304018.88 [s; MET]
UTC: 2005-05-09T04:00:19.237760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 189.055782430247 Dec: 29.000309642558 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6
Image Trigger?: NO
Rate S/N Ratio: 9.59166304662544 [ if not an image trigger ]
Image S/N Ratio: 6
Flight Position: [ source = BAT ]
RA: 189.055782430247 Dec: 29.000309642558 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 189.123666103037 Dec: 29.0049329570478 [deg; J2000]
{ 12h 36m 29.7s , +29d 00' 17.8" }
+/- 2.41533990588435 [arcmin] (estimated 90% radius based on SNR)
+/- 1.7551599528147 [arcmin] (formal 1-sigma fit error)
SNR: 8.62991632006069
RA = 12h 36m 29.7s (189.123666 deg.)
Dec = 29d 0' 18" (29.004933 deg.)
Angular difference between Flight and Ground position is 3.573038 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0479999780654907 +/- 0.0226274207068922
Measured from: -0.00800001621246338
to: 0.0399999618530273 [s; relative to TRIGTIME]
T50: 0.015999972820282 +/- 0.0160000026226044
Measured from: 0.00799998641014099
to: 0.023999959230423 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.476000010967255
to: 0.523999989032745 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00800001621246338
to: 0.0399999916553497 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.002672 0.007138 0.004551 0.002631
0.001117 0.001378 0.001257 0.000827 [error]
Peak 0.003417 0.007536 0.004210 0.002996
0.001274 0.001472 0.001369 0.000940 [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 1.07e-09 1.94e-09 2.71e-09 7.89e-09 7.78e-09 1.37e-08 erg/cm2
Error 3.93e-10 5.06e-10 8.53e-10 4.69e-09 2.16e-09 5.55e-09 erg/cm2
Peak flux Power-law 6.52e-01 5.95e-01 3.75e-01 3.61e-01 1.77e+00 1.98e+00 ph/cm2/s
Error 2.31e-01 1.53e-01 1.14e-01 1.93e-01 4.50e-01 4.97e-01 ph/cm2/s
Fluence Cutoff-PL 7.44e-10 2.44e-09 3.58e-09 1.86e-09 8.13e-09 8.91e-09 erg/cm2
Error 6.38e-10 7.29e-10 1.30e-09 3.63e-09 2.35e-09 4.04e-09 erg/cm2
Peak flux Cutoff-PL 5.14e-01 7.14e-01 4.91e-01 1.65e-01 1.84e+00 1.88e+00 ph/cm2/s
Error 2.70e-01 2.10e-01 1.80e-01 1.99e-01 4.56e-01 4.78e-01 ph/cm2/s
Fluence Band 7.68e-10 2.42e-09 3.55e-09 1.97e-09 8.13e-09 8.56e-09 erg/cm2
Error 4.25e-10 7.20e-10 1.06e-09 2.30e-09 2.33e-09 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.522 0.360 - - 1.71e-02 4.48e-03 47.133 57
CPL -0.304 2.242 69.7 106.7 1.30e-01 9.90e-01 43.887 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.666 0.344 - - 1.35e-02 3.51e-03 45.220 57
CPL 0.281 1.909 69.4 4976.2 6.46e-02 5.04e-01 42.746 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.048 -0.008 0.040
T90 0.048 -0.008 0.040
T50 0.016 0.008 0.024
Peak 1.000 -0.476 0.524
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
189.1237 +29.0049 0.0222 8.0 -46.5 0.0184 8.6 TRIG_00118749
------------------------------------------
Foreground time interval of the image:
-0.008 0.040 (delta_t = 0.048 [sec])
Background time interval of the image:
-299.752 -0.008 (delta_t = 299.744 [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 -0.008 sec. to 0.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52156 ( -0.342494 0.377085 )
Norm@50keV : 1.714008E-02 ( -4.500468E-03 4.453154E-03) )
------------------------------------------------------------
Chi-Squared = 47.13311 using 59 PHA bins.
Reduced chi-squared = 0.8268966 for 57 degrees of freedom
Null hypothesis probability = 0.821
Photon flux (15-150 keV) in 4.8000E-02 sec: 2.15242 ( -0.55263 0.55293 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.78157e-09 ( -2.15606e-09 2.15894e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.040 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.303772 ( -2.69623 1.78683 )
Epeak [keV] : 69.7349 ( -19.4507 193.993 )
Norm@50keV : 0.130055 ( -0.130055 1.84929 )
------------------------------------------------------------
Chi-Squared = 43.88694 using 59 PHA bins.
but latest trial 1.42156 gives Chi-Squared = 4.00689
Reduced chi-squared = 0.7836953 for 56 degrees of freedom
Null hypothesis probability = 0.880
Photon flux (15-150 keV) in 4.8000E-02 sec: 2.19917 ( -0.28211 0.55931 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.12933e-09 ( -2.33899e-09 2.35411e-09 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.296282 ( -1.40442 3.27760 )
beta : -5.08618 ( -4.91382 15.0764 )
Epeak [keV] : 69.8021 ( -26.7051 180.644 )
Norm@50keV : 0.129008 ( -0.129008 74.4792 )
------------------------------------------------------------
Chi-Squared = 43.88630 using 59 PHA bins.
Reduced chi-squared = 0.7979328 for 55 degrees of freedom
Null hypothesis probability = 0.859
Photon flux (15-150 keV) in 4.8000E-02 sec: 2.19499 ( -0.56783 0.5526 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.13403e-09 ( -2.27227e-09 2.33731e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.008 sec. to 0.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66619 ( -0.323597 0.364002 )
Norm@50keV : 1.350643E-02 ( -3.533168E-03 3.477165E-03) )
------------------------------------------------------------
Chi-Squared = 45.22025 using 59 PHA bins.
Reduced chi-squared = 0.7933376 for 57 degrees of freedom
Null hypothesis probability = 0.870
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.77314 ( -0.4504 0.45054 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.02624e-09 ( -2.15399e-09 2.15162e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.280882 ( -2.33230 1.48596 )
Epeak [keV] : 69.3699 ( -21.7924 9930.63 )
Norm@50keV : 6.460371E-02 ( -6.460371E-02 0.943054 )
------------------------------------------------------------
Chi-Squared = 42.74599 using 59 PHA bins.
Reduced chi-squared = 0.7633213 for 56 degrees of freedom
Null hypothesis probability = 0.904
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.84126 ( -0.45533 0.45622 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.64608e-09 ( -2.38822e-09 2.36122e-09 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.278214 ( -1.48737 4.25262 )
beta : -9.36813 ( )
Epeak [keV] : 69.3334 ( )
Norm@50keV : 6.479940E-02 ( )
------------------------------------------------------------
Chi-Squared = 42.74596 using 59 PHA bins.
Reduced chi-squared = 0.7771993 for 55 degrees of freedom
Null hypothesis probability = 0.886
Photon flux (15-150 keV) in 6.4000E-02 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Jan 5 02:46:19 EST 2008