batgrbproduct Analysis for Trigger=361958
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): Sat Sep 5 21:35:15 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger361958/GCN5_download_cron
======================================================================
Trigger: 00361958 Segment: 000
BAT Trigger Time: 273842120 [s; MET]
Trigger Stop: 273842440 [s; MET]
UTC: 2009-09-05T11:15:14.940980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.672193005355 Dec: -17.0720674645165 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.63
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.63
Flight Position: [ source = BAT ]
RA: 274.672193005355 Dec: -17.0720674645165 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.696925964005 Dec: -17.0634653310765 [deg; J2000]
{ 18h 18m 47.3s , -17d 03' 48.5" }
+/- 3.60560852329742 [arcmin] (estimated 90% radius based on SNR)
+/- 1.88052882085616 [arcmin] (formal 1-sigma fit error)
SNR: 4.86894317697727
Angular difference between Flight and Ground position is 1.509593 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.933898 0.504248 0.115533 -0.011919
0.117324 0.105337 0.089223 0.078866 [error]
Peak 0.933898 0.504248 0.115533 -0.011919
0.117324 0.105337 0.089223 0.078866 [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 2.75e-07 2.09e-07 1.06e-07 7.76e-08 6.27e-07 6.68e-07 erg/cm2
Error 5.55e-08 5.42e-08 5.84e-08 7.98e-08 1.48e-07 1.89e-07 erg/cm2
Peak flux Power-law 2.86e-02 1.22e-02 3.11e-03 9.71e-04 4.45e-02 4.49e-02 ph/cm2/s
Error 5.92e-03 3.01e-03 1.65e-03 1.10e-03 7.99e-03 8.13e-03 ph/cm2/s
Fluence Cutoff-PL 2.73e-07 2.20e-07 8.45e-08 1.70e-08 5.92e-07 5.95e-07 erg/cm2
Error 5.74e-08 6.35e-08 8.30e-08 4.81e-08 1.56e-07 2.02e-07 erg/cm2
Peak flux Cutoff-PL 2.86e-02 1.22e-02 3.11e-03 9.63e-04 4.45e-02 4.49e-02 ph/cm2/s
Error 5.91e-03 3.02e-03 1.65e-03 1.09e-03 7.99e-03 8.12e-03 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 0.00e+00 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 2.976 0.497 - - 1.65e-04 6.76e-05 58.660 57
CPL 1.611 0.000 8.8 0.0 1.41e-03 0.00e+00 58.520 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.976 0.497 - - 1.65e-04 6.76e-05 58.660 57
CPL 1.611 0.000 8.8 0.0 1.41e-03 0.00e+00 58.520 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.6969 -17.0635 0.0393 12.7 60.5 1.4653 4.9 TRIG_00361958
------------------------------------------
Foreground time interval of the image:
0.000 320.000 (delta_t = 320.000 [sec])
Background time interval of the image:
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 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.97617 ( -0.44832 0.546534 )
Norm@50keV : 1.64750E-04 ( -6.50377e-05 7.01697e-05 )
------------------------------------------------------------
# Chi-Squared = 58.66 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.144659e-01
Photon flux (15-150 keV) in 320 sec: 4.45305E-02 ( -0.00798321 0.00799298 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.26608e-07 ( -1.42001e-07 1.54363e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61077 ( )
Epeak [keV] : 8.80622 ( )
Norm@50keV : 1.40829E-03 ( )
------------------------------------------------------------
# Chi-Squared = 58.52 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 56 degrees of freedom
# Null hypothesis probability = 3.832275e-01
Photon flux (15-150 keV) in 320 sec: 4.45124E-02 ( -0.0079801 0.0079899 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.91581e-07 ( -1.37677e-07 1.73802e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.79557 ( 0.822496 3.18045 )
beta : -2.97607 ( -0.546334 0.447876 )
Epeak [keV] : 41.6389 ( -41.6389 -41.6389 )
Norm@50keV : 2.23935E-02 ( -0.00883337 0.00953611 )
------------------------------------------------------------
# Chi-Squared = 58.66 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 55 degrees of freedom
# Null hypothesis probability = 3.429108e-01
Photon flux (15-150 keV) in 320 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 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.97617 ( -0.44832 0.546534 )
Norm@50keV : 1.64750E-04 ( -6.50377e-05 7.01697e-05 )
------------------------------------------------------------
# Chi-Squared = 58.66 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.144659e-01
Photon flux (15-150 keV) in 320 sec: 4.45305E-02 ( -0.00798321 0.00799298 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.26608e-07 ( -1.42001e-07 1.54363e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61077 ( )
Epeak [keV] : 8.80622 ( )
Norm@50keV : 1.40829E-03 ( )
------------------------------------------------------------
# Chi-Squared = 58.52 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 56 degrees of freedom
# Null hypothesis probability = 3.832275e-01
Photon flux (15-150 keV) in 320 sec: 4.45124E-02 ( -0.0079801 0.0079899 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.91581e-07 ( -1.37677e-07 1.73802e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.79557 ( 0.822496 3.18045 )
beta : -2.97607 ( -0.546334 0.447876 )
Epeak [keV] : 41.6389 ( -41.6389 -41.6389 )
Norm@50keV : 2.23935E-02 ( -0.00883337 0.00953611 )
------------------------------------------------------------
# Chi-Squared = 58.66 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 55 degrees of freedom
# Null hypothesis probability = 3.429108e-01
Photon flux (15-150 keV) in 320 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Sep 5 21:56:35 EDT 2009