batgrbproduct Analysis for Trigger=177340
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 Dec 31 09:20:11 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger177340/GCN5_download_cron
======================================================================
Trigger: 00177340 Segment: 000
BAT Trigger Time: 158995250.208 [s; MET]
Trigger Stop: 158995250.592 [s; MET]
UTC: 2006-01-15T05:20:50.208000 [includes UTCF correction]
WARNING: UTCFINIT is zero. This is suspicious.
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 82.7150054893989 Dec: 13.3518409619621 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33360
Image Trigger?: NO
Rate S/N Ratio: 10.6770782520313 [ if not an image trigger ]
Image S/N Ratio: 33360
Flight Position: [ source = BAT ]
RA: 82.7150054893989 Dec: 13.3518409619621 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 82.6458596143475 Dec: 13.1682197596063 [deg; J2000]
{ 05h 30m 35.0s , +13d 10' 05.6" }
+/- 6.85432635987441 [arcmin] (estimated 90% radius based on SNR)
+/- 6.41071182992076 [arcmin] (formal 1-sigma fit error)
SNR: 1.94483598448648
RA = 5h 30m 35.0s (82.645860 deg.)
Dec = 13d 10' 6" (13.168220 deg.)
Angular difference between Flight and Ground position is 11.734005 arcmin
Partial Coding Fraction: 0.8515625 [ 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 0.003195 0.000563 -0.003369 0.006656
0.003194 0.003178 0.002897 0.002533 [error]
Peak 0.003195 0.000563 -0.003369 0.006656
0.003194 0.003178 0.002897 0.002533 [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 1.34e-09 2.22e-10 1.75e-11 1.50e-12 1.58e-09 1.56e-09 erg/cm2
Error 1.34e-09 7.22e-10 4.32e-10 5.19e-10 2.19e-09 2.12e-09 erg/cm2
Peak flux Power-law 1.23e-01 1.16e-02 4.48e-04 1.79e-05 1.35e-01 1.31e-01 ph/cm2/s
Error 1.19e-01 3.53e-02 1.04e-02 5.02e-03 1.48e-01 1.49e-01 ph/cm2/s
Fluence Cutoff-PL 1.33e-09 2.23e-10 1.75e-11 1.48e-12 1.57e-09 1.58e-09 erg/cm2
Error 1.35e-09 7.23e-10 4.32e-10 5.14e-10 2.19e-09 2.07e-09 erg/cm2
Peak flux Cutoff-PL 1.23e-01 1.21e-02 4.89e-04 2.03e-05 1.35e-01 1.36e-01 ph/cm2/s
Error 1.21e-01 3.53e-02 1.04e-02 4.96e-03 1.48e-01 1.48e-01 ph/cm2/s
Fluence Band 1.45e-09 2.22e-10 1.51e-11 6.12e-13 1.70e-09 2.71e-09 erg/cm2
Error 1.35e-09 7.42e-10 4.41e-11 1.72e-09 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.32e-01 8.84e-03 3.88e-05 1.17e-07 1.41e-01 7.11e-02 ph/cm2/s
Error 1.26e-01 2.09e-02 7.82e-03 3.30e-03 1.50e-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 6.228 3.763 - - 2.36e-05 5.04e-04 70.681 0
CPL 1.708 5.999 1.6 5000.0 8.44e-02 0.00e+00 70.511 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.228 3.763 - - 2.36e-05 5.04e-04 70.681 0
CPL 1.708 6.453 1.6 5000.0 8.44e-02 0.00e+00 70.511 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
82.6459 +13.1682 0.0998 17.8 133.4 0.0117 1.9 TRIG_00177340
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-10.240 -2.240 (delta_t = 8.000 [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: 6.22825 ( -3.75456 3.77175 )
Norm@50keV : 2.364047E-05 ( -2.364048E-05 9.837048E-04) )
------------------------------------------------------------
Chi-Squared = 70.68147 using 59 PHA bins.
but latest trial -1.02129 gives Chi-Squared = 3.03093
Reduced chi-squared = 1.240026 for 57 degrees of freedom
Null hypothesis probability = 0.105
Photon flux (15-150 keV) in 0.3840 sec: 0.134796 ( -0.134796 0.161931 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5767e-09 ( -1.5767e-09 2.80366e-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: 1.70839 ( -4.70839 7.28976 )
Epeak [keV] : 1.56887 ( -1.55887 9998.43 )
Norm@50keV : 8.438719E-02 ( )
------------------------------------------------------------
Chi-Squared = 70.51102 using 59 PHA bins.
Reduced chi-squared = 1.259125 for 56 degrees of freedom
Null hypothesis probability = 9.180E-02
Photon flux (15-150 keV) in 0.3840 sec: 0.134502 ( -0.134502 0.162059 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57454e-09 ( -1.57454e-09 2.80463e-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 : -1.86826 ( -0.198946 14.8011 )
beta : -3.46381 ( -4.37215 3.92674 )
Epeak [keV] : 4.43830 ( -4.33830 9995.56 )
Norm@50keV : 2.415278E-03 ( -6.144908E-03 0.129760 )
------------------------------------------------------------
Chi-Squared = 72.68158 using 59 PHA bins.
Reduced chi-squared = 1.321483 for 55 degrees of freedom
Null hypothesis probability = 5.535E-02
Photon flux (15-150 keV) in 0.3840 sec: 0.140796 ( -0.140796 0.15913 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70301e-09 ( -1.70301e-09 1.73576e-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: 6.22825 ( -3.75456 3.77175 )
Norm@50keV : 2.364047E-05 ( -2.364048E-05 9.837048E-04) )
------------------------------------------------------------
Chi-Squared = 70.68147 using 59 PHA bins.
but latest trial -1.02129 gives Chi-Squared = 3.03093
Reduced chi-squared = 1.240026 for 57 degrees of freedom
Null hypothesis probability = 0.105
Photon flux (15-150 keV) in 0.3840 sec: 0.134796 ( -0.134796 0.161931 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5767e-09 ( -1.5767e-09 2.80366e-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: 1.70839 ( -4.70839 8.19697 )
Epeak [keV] : 1.56887 ( -1.55887 9998.43 )
Norm@50keV : 8.438719E-02 ( )
------------------------------------------------------------
Chi-Squared = 70.51102 using 59 PHA bins.
Reduced chi-squared = 1.259125 for 56 degrees of freedom
Null hypothesis probability = 9.180E-02
Photon flux (15-150 keV) in 0.3840 sec: 0.134502 ( -0.134502 0.162059 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57454e-09 ( -1.57454e-09 2.80463e-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 : -1.86826 ( -0.198946 14.8011 )
beta : -3.46381 ( -4.37215 3.38436 )
Epeak [keV] : 4.43830 ( -4.33830 9995.56 )
Norm@50keV : 2.415278E-03 ( -6.144908E-03 0.129760 )
------------------------------------------------------------
Chi-Squared = 72.68158 using 59 PHA bins.
Reduced chi-squared = 1.321483 for 55 degrees of freedom
Null hypothesis probability = 5.535E-02
Photon flux (15-150 keV) in 0.3840 sec: 0.140796 ( -0.140796 0.15913 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70301e-09 ( -1.70301e-09 1.73576e-09 ) ergs/cm2
Plot creation:
Mon Dec 31 09:24:30 EST 2007