batgrbproduct Analysis for Trigger=174738
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 20:55:53 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger174738/SDC
======================================================================
Trigger: 00174738 Segment: 000
BAT Trigger Time: 157399635.968 [s; MET]
Trigger Stop: 157399636.992 [s; MET]
UTC: 2005-12-27T18:07:16.047360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 125.270470889684 Dec: 31.9290015448698 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.59
Image Trigger?: NO
Rate S/N Ratio: 22.8254244210267 [ if not an image trigger ]
Image S/N Ratio: 10.59
Flight Position: [ source = BAT ]
RA: 125.270470889684 Dec: 31.9290015448698 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 125.237069049945 Dec: 31.9511552460569 [deg; J2000]
{ 08h 20m 56.9s , +31d 57' 04.2" }
+/- 2.27507783516733 [arcmin] (estimated 90% radius based on SNR)
+/- 0.91441087607659 [arcmin] (formal 1-sigma fit error)
SNR: 9.39991061261211
RA = 8h 20m 56.9s (125.237069 deg.)
Dec = 31d 57' 4" (31.951155 deg.)
Angular difference between Flight and Ground position is 2.158514 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 114.576000034809 +/- 14.1300253362298
Measured from: 0.127999991178513
to: 114.704000025988 [s; relative to TRIGTIME]
T50: 52.7759999930859 +/- 22.4279455019736
Measured from: 6.49200001358986
to: 59.2680000066757 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.00799998641014099
to: 0.992000013589859 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.84799998998642
to: 122.731999993324 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.352900 0.408280 0.299946 0.086955
0.049825 0.051060 0.045214 0.040358 [error]
Peak 0.029176 0.035861 0.044373 0.015652
0.004889 0.005277 0.004970 0.004228 [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 9.12e-08 1.72e-07 2.51e-07 7.78e-07 7.11e-07 1.29e-06 erg/cm2
Error 2.12e-08 2.39e-08 4.54e-08 3.12e-07 1.09e-07 3.45e-07 erg/cm2
Peak flux Power-law 2.20e-01 2.91e-01 2.82e-01 4.88e-01 9.53e-01 1.28e+00 ph/cm2/s
Error 5.97e-02 4.69e-02 3.96e-02 1.55e-01 1.25e-01 1.79e-01 ph/cm2/s
Fluence Cutoff-PL 9.13e-08 1.72e-07 2.51e-07 7.72e-07 7.11e-07 1.29e-06 erg/cm2
Error 2.12e-08 2.39e-08 4.55e-08 3.09e-07 1.09e-07 3.43e-07 erg/cm2
Peak flux Cutoff-PL 2.20e-01 2.91e-01 2.82e-01 4.85e-01 9.53e-01 1.28e+00 ph/cm2/s
Error 5.97e-02 4.69e-02 3.96e-02 1.54e-01 1.25e-01 1.78e-01 ph/cm2/s
Fluence Band 9.09e-08 1.76e-07 2.49e-07 7.43e-07 7.09e-07 1.26e-06 erg/cm2
Error 1.83e-08 2.35e-08 3.84e-08 3.10e-07 9.97e-08 3.56e-07 erg/cm2
Peak flux Band 2.40e-01 3.18e-01 3.08e-01 5.33e-01 1.04e+00 1.27e+00 ph/cm2/s
Error 2.16e+03 9.65e-02 9.54e-02 1.80e-01 3.37e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.458 0.245 - - 6.02e-04 8.22e-05 55.681 57
CPL 1.455 0.246 9988.2 5000.0 6.04e-04 8.27e-05 55.688 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.045 0.236 - - 8.26e-03 1.05e-03 58.134 57
CPL 1.039 0.238 9993.1 5000.0 8.31e-03 1.06e-03 58.139 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: 156.544000 sec.
T50 in the 50-300 keV band: 86.144000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 123.580 -0.848 122.732
T90 114.576 0.128 114.704
T50 52.776 6.492 59.268
Peak 1.000 -0.008 0.992
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
125.2371 +31.9512 0.0204 21.0 -27.8 0.4132 9.4 TRIG_00174738
------------------------------------------
Foreground time interval of the image:
-0.848 22.437 (delta_t = 23.285 [sec])
Background time interval of the image:
-299.968 -0.848 (delta_t = 299.120 [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 -0.848 sec. to 122.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45764 ( -0.245072 0.244677 )
Norm@50keV : 6.018560E-04 ( -8.259458E-05 8.172070E-05) )
------------------------------------------------------------
Chi-Squared = 55.68079 using 59 PHA bins.
Reduced chi-squared = 0.9768559 for 57 degrees of freedom
Null hypothesis probability = 0.525
Photon flux (15-150 keV) in 123.6 sec: 7.431171E-02 ( -0.00995011 0.00996401 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.10994e-07 ( -1.08508e-07 1.09993e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.848 sec. to 122.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45526 ( -0.246619 0.245887 )
Epeak [keV] : 9988.21 ( -9988.20 11.7871 )
Norm@50keV : 6.037864E-04 ( -8.313515E-05 8.220976E-05) )
------------------------------------------------------------
Chi-Squared = 55.68773 using 59 PHA bins.
Reduced chi-squared = 0.9944237 for 56 degrees of freedom
Null hypothesis probability = 0.487
Photon flux (15-150 keV) in 123.6 sec: 7.428901E-02 ( -0.00994747 0.00996094 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.10861e-07 ( -1.08416e-07 1.10176e-07 ) ergs/cm2
Band function
Time interval is from -0.848 sec. to 122.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01178 ( -8.98822 6.01178 )
beta : -1.49316 ( -8.50684 0.266708 )
Epeak [keV] : 64.6572 ( -64.5572 9934.90 )
Norm@50keV : 1.225440E-03 ( -27.6187 15.2987 )
------------------------------------------------------------
Chi-Squared = 55.38279 using 59 PHA bins.
Reduced chi-squared = 1.006960 for 55 degrees of freedom
Null hypothesis probability = 0.460
Photon flux (15-150 keV) in 123.6 sec: 7.429161E-02 ( -0.0101932 0.00987894 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.08961e-07 ( -9.3145e-08 1.06319e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04457 ( -0.240012 0.232285 )
Norm@50keV : 8.258874E-03 ( -1.054460E-03 1.049944E-03) )
------------------------------------------------------------
Chi-Squared = 58.13385 using 59 PHA bins.
Reduced chi-squared = 1.019892 for 57 degrees of freedom
Null hypothesis probability = 0.433
Photon flux (15-150 keV) in 1.000 sec: 0.953495 ( -0.124668 0.125045 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.7909e-08 ( -1.22097e-08 1.2352e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03904 ( -0.241871 0.233956 )
Epeak [keV] : 9993.11 ( -9993.10 6.88672 )
Norm@50keV : 8.306703E-03 ( -1.058533E-03 1.054636E-03) )
------------------------------------------------------------
Chi-Squared = 58.13950 using 59 PHA bins.
Reduced chi-squared = 1.038205 for 56 degrees of freedom
Null hypothesis probability = 0.396
Photon flux (15-150 keV) in 1.000 sec: 0.953225 ( -0.124623 0.125015 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.7981e-08 ( -1.22473e-08 1.2328e-08 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.866700 ( -9.13330 5.86568 )
beta : -1.04453 ( -8.95547 0.239918 )
Epeak [keV] : 51.5498 ( -51.4498 9948.45 )
Norm@50keV : 1.364057E-02 ( -6.424020E-03 2159.54 )
------------------------------------------------------------
Chi-Squared = 58.13387 using 59 PHA bins.
Reduced chi-squared = 1.056979 for 55 degrees of freedom
Null hypothesis probability = 0.361
Photon flux (15-150 keV) in 1.000 sec: 1.04113 ( -0.262401 0.41086 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.79278e-08 ( -1.22849e-08 1.22972e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 21:08:55 EST 2008