batgrbproduct Analysis for Trigger=362818
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): Wed Sep 16 15:04:38 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger362818/GCN5_download_cron
======================================================================
Trigger: 00362818 Segment: 000
BAT Trigger Time: 274777249.216 [s; MET]
Trigger Stop: 274777249.472 [s; MET]
UTC: 2009-09-16T07:00:44.126400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 126.579580098003 Dec: 25.9332286507725 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.61
Image Trigger?: NO
Rate S/N Ratio: 16.3707055437449 [ if not an image trigger ]
Image S/N Ratio: 7.61
Flight Position: [ source = BAT ]
RA: 126.579580098003 Dec: 25.9332286507725 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 126.580528546906 Dec: 25.9419122848889 [deg; J2000]
{ 08h 26m 19.3s , +25d 56' 30.9" }
+/- 2.69328126571536 [arcmin] (estimated 90% radius based on SNR)
+/- 1.24079026621722 [arcmin] (formal 1-sigma fit error)
SNR: 7.38635578046617
Angular difference between Flight and Ground position is 0.523525 arcmin
Partial Coding Fraction: 0.3476562 [ including projection effects ]
Duration
T90: 63.4639999270439 +/- 15.2145472216625
Measured from: 0.144000113010406
to: 63.6080000400543 [s; relative to TRIGTIME]
T50: 40.2599999308586 +/- 17.6556687731481
Measured from: 3.37600010633469
to: 43.6360000371933 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0400000214576721
to: 0.959999978542328 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0360000133514404
to: 68.5119999647141 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.431793 0.337392 0.457595 0.123840
0.081871 0.085631 0.076141 0.067741 [error]
Peak 0.061079 0.074711 0.068812 0.019111
0.011012 0.011929 0.011125 0.009088 [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 1.13e-07 2.22e-07 3.38e-07 1.12e-06 9.48e-07 1.79e-06 erg/cm2
Error 3.96e-08 4.63e-08 7.37e-08 5.56e-07 1.83e-07 5.97e-07 erg/cm2
Peak flux Power-law 5.98e-01 6.35e-01 4.77e-01 5.82e-01 1.93e+00 2.29e+00 ph/cm2/s
Error 1.76e-01 1.15e-01 8.91e-02 2.27e-01 3.22e-01 3.65e-01 ph/cm2/s
Fluence Cutoff-PL 1.13e-07 2.22e-07 3.39e-07 1.11e-06 9.48e-07 1.79e-06 erg/cm2
Error 3.96e-08 4.64e-08 7.38e-08 5.52e-07 1.83e-07 5.94e-07 erg/cm2
Peak flux Cutoff-PL 5.98e-01 6.35e-01 4.77e-01 5.79e-01 1.93e+00 2.29e+00 ph/cm2/s
Error 1.76e-01 1.15e-01 8.92e-02 2.26e-01 3.22e-01 3.65e-01 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 1.394 0.329 - - 1.43e-03 2.58e-04 53.580 57
CPL 1.391 1.834 9999.2 0.0 1.43e-03 1.85e-03 53.580 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.412 0.275 - - 1.58e-02 2.51e-03 48.530 57
CPL 1.411 0.276 9999.4 0.0 1.59e-02 1.84e-02 48.530 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: 66.880000 sec.
T50 in the 50-300 keV band: 39.360000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 68.548 -0.036 68.512
T90 63.464 0.144 63.608
T50 40.260 3.376 43.636
Peak 1.000 -0.040 0.960
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
126.5805 +25.9419 0.0260 48.2 -11.3 1.3578 7.4 TRIG_00362818
------------------------------------------
Foreground time interval of the image:
-0.036 68.512 (delta_t = 68.548 [sec])
Background time interval of the image:
-228.115 -0.036 (delta_t = 228.079 [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 -0.036 sec. to 68.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39390 ( -0.331198 0.326689 )
Norm@50keV : 1.42964E-03 ( -0.000258434 0.000258428 )
------------------------------------------------------------
# Chi-Squared = 53.58 using 59 PHA bins.
# Reduced chi-squared = 0.9400 for 57 degrees of freedom
# Null hypothesis probability = 6.040973e-01
Photon flux (15-150 keV) in 68.55 sec: 0.173866 ( -0.0336393 0.0338635 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.48142e-07 ( -1.82567e-07 1.8361e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 68.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39051 ( -1.15091 2.51697 )
Epeak [keV] : 9999.16 ( )
Norm@50keV : 1.43485E-03 ( -0.000259372 0.00344203 )
------------------------------------------------------------
# Chi-Squared = 53.58 using 59 PHA bins.
# Reduced chi-squared = 0.9569 for 56 degrees of freedom
# Null hypothesis probability = 5.668700e-01
Photon flux (15-150 keV) in 68.55 sec: 0.173798 ( -0.033627 0.033853 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.48403e-07 ( -1.82645e-07 1.84043e-07 ) ergs/cm2
Band function
Time interval is from -0.036 sec. to 68.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02722 ( 1.02739 1.02739 )
beta : -1.39588 ( 1.39674 0.3334 )
Epeak [keV] : 61.4282 ( -61.1742 -61.1742 )
Norm@50keV : 2.74312E-03 ( -0.00274986 3.78966 )
------------------------------------------------------------
# Chi-Squared = 53.57 using 59 PHA bins.
# Reduced chi-squared = 0.9741 for 55 degrees of freedom
# Null hypothesis probability = 5.292683e-01
Photon flux (15-150 keV) in 68.55 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 -0.036 sec. to 0.956 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41163 ( -0.275594 0.27373 )
Norm@50keV : 1.58257E-02 ( -0.00250801 0.0025025 )
------------------------------------------------------------
# Chi-Squared = 48.53 using 59 PHA bins.
# Reduced chi-squared = 0.8514 for 57 degrees of freedom
# Null hypothesis probability = 7.802592e-01
Photon flux (15-150 keV) in 0.992 sec: 1.93242 ( -0.32097 0.322624 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51339e-07 ( -2.56993e-08 2.58515e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 0.956 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41122 ( -0.279196 0.273708 )
Epeak [keV] : 9999.36 ( -9999.99 -9999.99 )
Norm@50keV : 1.58727E-02 ( -0.00250733 0.0343425 )
------------------------------------------------------------
# Chi-Squared = 48.53 using 59 PHA bins.
# Reduced chi-squared = 0.8666 for 56 degrees of freedom
# Null hypothesis probability = 7.504879e-01
Photon flux (15-150 keV) in 0.992 sec: 1.93187 ( -0.32087 0.32252 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51379e-07 ( -2.57126e-08 2.58644e-08 ) ergs/cm2
Band function
Time interval is from -0.036 sec. to 0.956 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99490 ( -376.605 -376.605 )
beta : -1.46822 ( -0.315679 0.289397 )
Epeak [keV] : 23.7989 ( -23.0797 10.5332 )
Norm@50keV : 2085.30 ( -2094.13 5.73782e+06 )
------------------------------------------------------------
# Chi-Squared = 47.59 using 59 PHA bins.
# Reduced chi-squared = 0.8652 for 55 degrees of freedom
# Null hypothesis probability = 7.507353e-01
Photon flux (15-150 keV) in 0.992 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Sep 16 15:22:30 EDT 2009