batgrbproduct Analysis for Trigger=361993
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 v2.45
Process Start Time (local time): Sun Sep 6 09:08:20 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger361993/GCN5_download_cron
======================================================================
Trigger: 00361993 Segment: 000
BAT Trigger Time: 273876577.856 [s; MET]
Trigger Stop: 273876578.88 [s; MET]
UTC: 2009-09-05T20:49:32.795860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 168.828114597611 Dec: -73.7594919953175 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.79
Image Trigger?: NO
Rate S/N Ratio: 10.5356537528527 [ if not an image trigger ]
Image S/N Ratio: 5.79
Flight Position: [ source = BAT ]
RA: 168.828114597611 Dec: -73.7594919953175 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 168.805924227868 Dec: -73.8051952896609 [deg; J2000]
{ 11h 15m 13.4s , -73d 48' 18.7" }
+/- 4.51488917998455 [arcmin] (estimated 90% radius based on SNR)
+/- 2.67993150230772 [arcmin] (formal 1-sigma fit error)
SNR: 3.53108558973198
Angular difference between Flight and Ground position is 2.767295 arcmin
Partial Coding Fraction: 0.2050781 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 2.98023223876953e-08
to: 1.02400001883507 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.021109 -0.020070 0.060517 0.058471
0.016840 0.017257 0.016325 0.016956 [error]
Peak 0.021109 -0.020070 0.060517 0.058471
0.016840 0.017257 0.016325 0.016956 [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 1.59e-09 6.18e-09 2.01e-08 2.17e-07 5.69e-08 2.45e-07 erg/cm2
Error 3.94e-09 8.02e-09 1.74e-08 5.23e-07 3.89e-08 5.28e-07 erg/cm2
Peak flux Power-law 4.88e-02 1.02e-01 1.66e-01 6.08e-01 4.58e-01 9.25e-01 ph/cm2/s
Error 1.24e-01 1.36e-01 1.44e-01 1.22e+00 4.41e-01 1.14e+00 ph/cm2/s
Fluence Cutoff-PL 4.79e-10 5.41e-09 2.73e-08 4.59e-08 5.89e-08 7.72e-08 erg/cm2
Error 3.09e-09 7.21e-09 1.89e-08 2.72e-07 3.77e-08 2.69e-07 erg/cm2
Peak flux Cutoff-PL 4.85e-02 1.01e-01 1.66e-01 6.05e-01 4.58e-01 9.21e-01 ph/cm2/s
Error 1.24e-01 1.36e-01 1.44e-01 1.32e+00 4.41e-01 1.22e+00 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 5.13e-01 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 0.294 0.860 - - 3.70e-03 3.84e-03 59.800 57
CPL -4.987 0.000 100.3 64.6 1.37e-01 1.14e-01 58.190 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.294 0.860 - - 3.70e-03 3.84e-03 59.800 57
CPL -4.987 0.000 100.3 64.6 1.37e-01 1.14e-01 58.190 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
168.8059 -73.8052 0.0546 52.5 -171.3 0.1252 3.5 TRIG_00361993
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.856 -9.856 (delta_t = 51.000 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.294239 ( -0.294155 1.42608 )
Norm@50keV : 3.70487E-03 ( -0.00370453 0.00398451 )
------------------------------------------------------------
# Chi-Squared = 59.80 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.742850e-01
Photon flux (15-150 keV) in 1.024 sec: 0.457659 ( -0.45766 0.425271 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68776e-08 ( -3.88146e-08 3.89798e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98746 ( )
Epeak [keV] : 100.292 ( -30.1499 99.1491 )
Norm@50keV : 0.136747 ( -0.136746 0.0908707 )
------------------------------------------------------------
# Chi-Squared = 58.19 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 56 degrees of freedom
# Null hypothesis probability = 3.946312e-01
Photon flux (15-150 keV) in 1.024 sec: 0.457589 ( -0.457589 0.424852 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88798e-08 ( -3.73264e-08 3.79813e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.27953 ( 0.423779 0.423779 )
beta : -6.11533 ( -1.4261 0.29406 )
Epeak [keV] : 102.352 ( -102.706 232.936 )
Norm@50keV : 8.01692E-02 ( -0.0586906 0.590308 )
------------------------------------------------------------
# Chi-Squared = 58.53 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.473570e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.294239 ( -0.294155 1.42608 )
Norm@50keV : 3.70487E-03 ( -0.00370453 0.00398451 )
------------------------------------------------------------
# Chi-Squared = 59.80 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.742850e-01
Photon flux (15-150 keV) in 1.024 sec: 0.457659 ( -0.45766 0.425271 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68776e-08 ( -3.88146e-08 3.89798e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98746 ( )
Epeak [keV] : 100.292 ( -30.1499 99.1491 )
Norm@50keV : 0.136747 ( -0.136746 0.0908707 )
------------------------------------------------------------
# Chi-Squared = 58.19 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 56 degrees of freedom
# Null hypothesis probability = 3.946312e-01
Photon flux (15-150 keV) in 1.024 sec: 0.457589 ( -0.457589 0.424852 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88798e-08 ( -3.73264e-08 3.79813e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.27953 ( 0.423779 0.423779 )
beta : -6.11533 ( -1.4261 0.29406 )
Epeak [keV] : 102.352 ( -102.706 232.936 )
Norm@50keV : 8.01692E-02 ( -0.0586906 0.590308 )
------------------------------------------------------------
# Chi-Squared = 58.53 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.473570e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sun Sep 6 09:17:56 EDT 2009