batgrbproduct Analysis for Trigger=147325
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 Jan 7 18:03:37 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger147325/GCN5_download_cron
======================================================================
Trigger: 00147325 Segment: 000
BAT Trigger Time: 143810269.408 [s; MET]
Trigger Stop: 143810269.792 [s; MET]
UTC: 2005-07-23T11:17:49.771640 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 228.395275837795 Dec: -26.0819182603309 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33395
Image Trigger?: NO
Rate S/N Ratio: 8.42614977317636 [ if not an image trigger ]
Image S/N Ratio: 33395
Flight Position: [ source = BAT ]
RA: 228.395275837795 Dec: -26.0819182603309 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 228.350781184922 Dec: -25.8787197338783 [deg; J2000]
{ 15h 13m 24.2s , -25d 52' 43.4" }
+/- 5.17586916940715 [arcmin] (estimated 90% radius based on SNR)
+/- 2.76850792753872 [arcmin] (formal 1-sigma fit error)
SNR: 2.90497401003462
RA = 15h 13m 24.2s (228.350781 deg.)
Dec = -25d 52' 43" (-25.878720 deg.)
Angular difference between Flight and Ground position is 12.425868 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
T50: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.38400000333786 second)
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.000860 0.002839 0.003892 -0.001032
0.003277 0.003079 0.002743 0.002396 [error]
Peak 0.000860 0.002839 0.003892 -0.001032
0.003277 0.003079 0.002743 0.002396 [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 1.25e-09 1.03e-09 5.76e-10 4.72e-10 3.07e-09 3.29e-09 erg/cm2
Error 1.35e-09 1.25e-09 1.42e-09 1.50e-08 4.16e-09 1.51e-08 erg/cm2
Peak flux Power-law 1.08e-01 4.99e-02 1.39e-02 4.83e-03 1.75e-01 1.77e-01 ph/cm2/s
Error 1.18e-01 5.90e-02 3.27e-02 9.05e-02 1.85e-01 1.90e-01 ph/cm2/s
Fluence Cutoff-PL 1.50e-09 1.09e-09 4.34e-11 1.00e-14 2.64e-09 2.64e-09 erg/cm2
Error 1.54e-09 1.40e-09 1.30e-09 7.44e-10 2.74e-09 2.74e-09 erg/cm2
Peak flux Cutoff-PL 1.25e-01 5.77e-02 1.39e-03 1.95e-07 1.84e-01 1.74e-01 ph/cm2/s
Error 1.31e-01 6.73e-02 3.04e-02 3.99e-03 1.82e-01 0.00e+00 ph/cm2/s
Fluence Band 1.38e-09 1.11e-09 2.36e-10 4.97e-11 2.78e-09 2.71e-09 erg/cm2
Error 1.46e-09 1.56e-09 1.21e-09 4.14e-09 3.96e-09 1.06e-08 erg/cm2
Peak flux Band 1.16e-01 5.45e-02 4.82e-03 4.79e-05 1.75e-01 1.75e-01 ph/cm2/s
Error 1.19e-01 7.06e-02 3.31e-02 4.51e-02 1.80e-01 1.80e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.844 6.500 - - 7.10e-04 1.18e-03 53.211 57
CPL -2.410 0.000 21.7 5000.0 6.47e+00 1.13e+02 52.720 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.844 6.500 - - 7.10e-04 1.18e-03 53.211 57
CPL -2.410 0.000 21.7 5000.0 6.47e+00 1.13e+02 52.720 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 0.384 0.000 0.384
T90 0.384 0.000 0.384
T50 0.384 0.000 0.384
Peak 0.384 0.000 0.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
228.3508 -25.8787 0.0661 26.9 16.0 0.0172 2.9 TRIG_00147325
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-60.440 -5.440 (delta_t = 55.000 [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 -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.84402 ( -5.84402 7.15598 )
Norm@50keV : 7.099522E-04 ( -7.099522E-04 1.642111E-03) )
------------------------------------------------------------
Chi-Squared = 53.21050 using 59 PHA bins.
Reduced chi-squared = 0.9335176 for 57 degrees of freedom
Null hypothesis probability = 0.618
Photon flux (15-150 keV) in 0.3840 sec: 0.174873 ( -0.174873 0.195031 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06759e-09 ( -3.06759e-09 5.24797e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.41025 ( )
Epeak [keV] : 21.7053 ( -22.3857 9977.60 )
Norm@50keV : 6.47387 ( -16.1599 209.299 )
------------------------------------------------------------
Chi-Squared = 52.72010 using 59 PHA bins.
Reduced chi-squared = 0.9414304 for 56 degrees of freedom
Null hypothesis probability = 0.600
Photon flux (15-150 keV) in 0.3840 sec: 0.183605 ( -0.183605 0.180085 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.63951e-09 ( -2.63951e-09 2.84301e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.84000 ( -8.16000 6.84000 )
beta : -9.21626 ( -0.783744 19.2163 )
Epeak [keV] : 6.34401 ( -6.24401 9993.66 )
Norm@50keV : 2.925122E-03 ( -2.925122E-03 2106.79 )
------------------------------------------------------------
Chi-Squared = 53.18266 using 59 PHA bins.
Reduced chi-squared = 0.9669574 for 55 degrees of freedom
Null hypothesis probability = 0.544
Photon flux (15-150 keV) in 0.3840 sec: 0.175457 ( -0.175457 0.183824 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78187e-09 ( -2.78187e-09 5.1398e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.84402 ( -5.84402 7.15598 )
Norm@50keV : 7.099522E-04 ( -7.099522E-04 1.642111E-03) )
------------------------------------------------------------
Chi-Squared = 53.21050 using 59 PHA bins.
Reduced chi-squared = 0.9335176 for 57 degrees of freedom
Null hypothesis probability = 0.618
Photon flux (15-150 keV) in 0.3840 sec: 0.174873 ( -0.174873 0.195031 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06759e-09 ( -3.06759e-09 5.24797e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.41025 ( )
Epeak [keV] : 21.7053 ( -22.3857 9977.60 )
Norm@50keV : 6.47387 ( -16.1599 209.299 )
------------------------------------------------------------
Chi-Squared = 52.72010 using 59 PHA bins.
Reduced chi-squared = 0.9414304 for 56 degrees of freedom
Null hypothesis probability = 0.600
Photon flux (15-150 keV) in 0.3840 sec: 0.183605 ( -0.183605 0.180085 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.63951e-09 ( -2.63951e-09 2.84301e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.84000 ( -8.16000 6.84000 )
beta : -9.21626 ( -0.783744 19.2163 )
Epeak [keV] : 6.34401 ( -6.24401 9993.66 )
Norm@50keV : 2.925122E-03 ( -2.925122E-03 2106.79 )
------------------------------------------------------------
Chi-Squared = 53.18266 using 59 PHA bins.
Reduced chi-squared = 0.9669574 for 55 degrees of freedom
Null hypothesis probability = 0.544
Photon flux (15-150 keV) in 0.3840 sec: 0.175457 ( -0.175457 0.183824 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78187e-09 ( -2.78187e-09 5.1398e-09 ) ergs/cm2
Plot creation:
Mon Jan 7 18:11:34 EST 2008