batgrbproduct Analysis for Trigger=172767
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 19:49:24 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger172767/GCN5_download_cron
======================================================================
Trigger: 00172767 Segment: 000
BAT Trigger Time: 156299989.088 [s; MET]
Trigger Stop: 156299989.472 [s; MET]
UTC: 2005-12-15T00:39:49.191440 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 163.138835454615 Dec: 38.6261488448551 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33428
Image Trigger?: NO
Rate S/N Ratio: 9.79795897113271 [ if not an image trigger ]
Image S/N Ratio: 33428
Flight Position: [ source = BAT ]
RA: 163.138835454615 Dec: 38.6261488448551 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 163.091571381217 Dec: 38.7253409088106 [deg; J2000]
{ 10h 52m 22.0s , +38d 43' 31.2" }
+/- 8.14542160048998 [arcmin] (estimated 90% radius based on SNR)
+/- 7.0455631792669 [arcmin] (formal 1-sigma fit error)
SNR: 1.51989393818646
RA = 10h 52m 22.0s (163.091571 deg.)
Dec = 38d 43' 31" (38.725341 deg.)
Angular difference between Flight and Ground position is 6.349970 arcmin
Partial Coding Fraction: 0.8984375 [ 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 0.001753 0.003069 0.000840 0.004812
0.002810 0.002846 0.002566 0.002260 [error]
Peak 0.001753 0.003069 0.000840 0.004812
0.002810 0.002846 0.002566 0.002260 [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 7.99e-13 1.59e-11 2.96e-10 6.15e-08 1.73e-09 4.76e-08 erg/cm2
Error 6.03e-10 9.98e-10 2.09e-09 9.20e-08 5.88e-09 0.00e+00 erg/cm2
Peak flux Power-law 6.32e-03 1.77e-02 4.08e-02 2.54e-01 1.10e-01 3.12e-01 ph/cm2/s
Error 5.48e-02 4.75e-02 4.75e-02 5.87e-01 6.07e-01 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 5.60e-13 1.26e-11 2.66e-10 6.78e-08 1.65e-09 4.40e-08 erg/cm2
Error 6.02e-10 9.97e-10 2.09e-09 1.02e-07 5.88e-09 0.00e+00 erg/cm2
Peak flux Cutoff-PL 6.20e-03 1.77e-02 4.08e-02 2.53e-01 1.10e-01 3.16e-01 ph/cm2/s
Error 5.48e-02 4.75e-02 4.75e-02 6.45e-01 6.63e-01 0.00e+00 ph/cm2/s
Fluence Band 7.65e-11 4.12e-10 1.90e-09 3.56e-08 1.98e-09 3.31e-08 erg/cm2
Error 6.37e-10 1.03e-09 2.15e-09 5.87e-09 2.91e-07 0.00e+00 erg/cm2
Peak flux Band 1.20e-07 2.90e-06 6.38e-05 1.73e-02 4.05e-04 3.36e-01 ph/cm2/s
Error 5.34e-02 4.68e-02 5.17e-02 1.21e+00 1.45e-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 -0.133 0.000 - - 7.85e-04 1.24e-03 54.247 57
CPL -0.551 0.000 328.2 5000.0 1.33e-03 3.41e-01 54.367 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.133 0.000 - - 7.85e-04 1.24e-03 54.247 57
CPL -0.551 0.000 328.2 5000.0 1.33e-03 6.37e-03 54.367 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
163.0916 +38.7253 0.1259 24.6 -30.8 0.0083 1.5 TRIG_00172767
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-60.120 -5.120 (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: -0.132643 ( )
Norm@50keV : 7.853017E-04 ( -1.180432E-05 2.471910E-03) )
------------------------------------------------------------
Chi-Squared = 54.24706 using 59 PHA bins.
Reduced chi-squared = 0.9517028 for 57 degrees of freedom
Null hypothesis probability = 0.579
Photon flux (15-150 keV) in 0.3840 sec: 0.110168 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72957e-09 ( -1.72957e-09 1.00331e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.551056 ( )
Epeak [keV] : 328.172 ( -328.163 9671.83 )
Norm@50keV : 1.330037E-03 ( -5.151461E-13 0.682077 )
------------------------------------------------------------
Chi-Squared = 54.36677 using 59 PHA bins.
but latest trial 1.07324 gives Chi-Squared = 8.58845
Reduced chi-squared = 0.9708351 for 56 degrees of freedom
Null hypothesis probability = 0.537
Photon flux (15-150 keV) in 0.3840 sec: 0.110121 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65314e-09 ( -1.65314e-09 1.01046e-08 ) 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 : -0.431806 ( -9.56819 5.43181 )
beta : 0.159192 ( -16.6487 3.35127 )
Epeak [keV] : 16.2967 ( -16.1991 9983.70 )
Norm@50keV : 1.240323E-03 ( -2.203484E-14 5249.21 )
------------------------------------------------------------
Chi-Squared = 54.24657 using 59 PHA bins.
Reduced chi-squared = 0.9863012 for 55 degrees of freedom
Null hypothesis probability = 0.503
Photon flux (15-150 keV) in 0.3840 sec: 4.053921E-04 ( -0.000405392 0.290255 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98241e-09 ( -1.98241e-09 9.76063e-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: -0.132643 ( )
Norm@50keV : 7.853017E-04 ( -1.180432E-05 2.471910E-03) )
------------------------------------------------------------
Chi-Squared = 54.24706 using 59 PHA bins.
Reduced chi-squared = 0.9517028 for 57 degrees of freedom
Null hypothesis probability = 0.579
Photon flux (15-150 keV) in 0.3840 sec: 0.110168 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72957e-09 ( -1.72957e-09 1.00331e-08 ) 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: -0.551056 ( )
Epeak [keV] : 328.172 ( -328.165 9671.83 )
Norm@50keV : 1.330037E-03 ( -6.585678E-24 1.273486E-02) )
------------------------------------------------------------
Chi-Squared = 54.36677 using 59 PHA bins.
Reduced chi-squared = 0.9708351 for 56 degrees of freedom
Null hypothesis probability = 0.537
Photon flux (15-150 keV) in 0.3840 sec: 0.110121 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65314e-09 ( -1.65314e-09 1.01046e-08 ) 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 : -0.431806 ( -9.56819 5.43181 )
beta : 0.159192 ( -16.6487 3.35127 )
Epeak [keV] : 16.2967 ( -16.1991 9983.70 )
Norm@50keV : 1.240323E-03 ( -2.203484E-14 5249.21 )
------------------------------------------------------------
Chi-Squared = 54.24657 using 59 PHA bins.
Reduced chi-squared = 0.9863012 for 55 degrees of freedom
Null hypothesis probability = 0.503
Photon flux (15-150 keV) in 0.3840 sec: 4.053921E-04 ( -0.000405392 0.290255 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98241e-09 ( -1.98241e-09 9.76063e-09 ) ergs/cm2
Plot creation:
Wed Jan 9 19:58:15 EST 2008