batgrbproduct Analysis for Trigger=380311
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): Tue Dec 22 07:09:00 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger380311/GCN5_download_cron
======================================================================
Trigger: 00380311 Segment: 000
BAT Trigger Time: 283121577.664 [s; MET]
Trigger Stop: 283121578.688 [s; MET]
UTC: 2009-12-21T20:52:52.295660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 55.7537241011415 Dec: 23.2118519779555 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.54
Image Trigger?: NO
Rate S/N Ratio: 9.38083151964686 [ if not an image trigger ]
Image S/N Ratio: 7.54
Flight Position: [ source = BAT ]
RA: 55.7537241011415 Dec: 23.2118519779555 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 55.7982026312823 Dec: 23.2430988430124 [deg; J2000]
{ 03h 43m 11.6s , +23d 14' 35.2" }
+/- 1.354679660814 [arcmin] (estimated 90% radius based on SNR)
+/- 0.429980851084277 [arcmin] (formal 1-sigma fit error)
SNR: 19.7142547927969
Angular difference between Flight and Ground position is 3.086940 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 68.5079999566078 +/- 5.51264582654625
Measured from: -33.3479998707771
to: 35.1600000858307 [s; relative to TRIGTIME]
T50: 17.7199999690056 +/- 1.18400000559317
Measured from: 10.5040001273155
to: 28.2240000963211 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 20.6960000395775
to: 21.6960000395775 [s; relative to TRIGTIME]
Total Fluence
Measured from: -43.5799999833107
to: 41.0840000510216 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.710439 3.394731 2.442030 0.630412
0.075493 0.076520 0.063982 0.052698 [error]
Peak 0.088529 0.114857 0.128738 0.046719
0.009203 0.009748 0.008795 0.006983 [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 8.44e-07 1.47e-06 1.95e-06 5.28e-06 5.68e-06 9.54e-06 erg/cm2
Error 4.86e-08 4.75e-08 6.82e-08 4.33e-07 1.64e-07 4.65e-07 erg/cm2
Peak flux Power-law 7.70e-01 9.44e-01 8.40e-01 1.29e+00 3.00e+00 3.84e+00 ph/cm2/s
Error 1.20e-01 8.80e-02 7.14e-02 2.41e-01 2.37e-01 3.05e-01 ph/cm2/s
Fluence Cutoff-PL 8.43e-07 1.47e-06 1.95e-06 5.24e-06 5.68e-06 9.50e-06 erg/cm2
Error 4.86e-08 4.76e-08 6.83e-08 4.30e-07 1.64e-07 3.60e-07 erg/cm2
Peak flux Cutoff-PL 7.69e-01 9.44e-01 8.40e-01 1.28e+00 3.00e+00 3.83e+00 ph/cm2/s
Error 1.20e-01 8.81e-02 7.15e-02 2.39e-01 2.37e-01 3.04e-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 1.591 0.055 - - 7.17e-03 1.99e-04 30.280 57
CPL 1.592 0.092 9999.4 0.0 7.16e-03 5.25e-04 30.350 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.169 0.137 - - 2.57e-02 1.94e-03 44.380 57
CPL 1.164 0.330 9995.0 0.0 2.58e-02 1.14e-02 44.370 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: 31.744000 sec.
T50 in the 50-300 keV band: 13.504000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 84.664 -43.580 41.084
T90 68.508 -33.348 35.160
T50 17.720 10.504 28.224
Peak 1.000 20.696 21.696
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
55.7982 +23.2431 0.0097 27.3 -57.0 2.4748 19.7 TRIG_00380311
------------------------------------------
Foreground time interval of the image:
-43.580 10.837 (delta_t = 54.417 [sec])
Background time interval of the image:
-201.263 -43.580 (delta_t = 157.683 [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 -43.580 sec. to 41.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59110 ( -0.0553198 0.0553501 )
Norm@50keV : 7.16626E-03 ( -0.000198694 0.000198675 )
------------------------------------------------------------
# Chi-Squared = 30.28 using 59 PHA bins.
# Reduced chi-squared = 0.5313 for 57 degrees of freedom
# Null hypothesis probability = 9.986048e-01
Photon flux (15-150 keV) in 84.66 sec: 0.918379 ( -0.0290805 0.029206 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68013e-06 ( -1.64025e-07 1.64467e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -43.580 sec. to 41.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59156 ( -0.131037 0.0534655 )
Epeak [keV] : 9999.36 ( -9999.97 -9999.97 )
Norm@50keV : 7.16434E-03 ( -0.000198749 0.000852127 )
------------------------------------------------------------
# Chi-Squared = 30.35 using 59 PHA bins.
# Reduced chi-squared = 0.5420 for 56 degrees of freedom
# Null hypothesis probability = 9.979807e-01
Photon flux (15-150 keV) in 84.66 sec: 0.917831 ( -0.029061 0.029192 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68051e-06 ( -1.64063e-07 1.64503e-07 ) ergs/cm2
Band function
Time interval is from -43.580 sec. to 41.084 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16106 ( 1.14764 1.14764 )
beta : -1.59389 ( -0.0638154 0.0566605 )
Epeak [keV] : 44.3263 ( -42.6372 -42.6372 )
Norm@50keV : 1.55000E-02 ( -0.0169389 92.5617 )
------------------------------------------------------------
# Chi-Squared = 30.14 using 59 PHA bins.
# Reduced chi-squared = 0.5479 for 55 degrees of freedom
# Null hypothesis probability = 9.974561e-01
Photon flux (15-150 keV) in 84.66 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 20.696 sec. to 21.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16891 ( -0.137951 0.135867 )
Norm@50keV : 2.56743E-02 ( -0.00194262 0.00194009 )
------------------------------------------------------------
# Chi-Squared = 44.38 using 59 PHA bins.
# Reduced chi-squared = 0.7785 for 57 degrees of freedom
# Null hypothesis probability = 8.886084e-01
Photon flux (15-150 keV) in 1 sec: 3.00111 ( -0.236959 0.237764 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62819e-07 ( -2.159e-08 2.17208e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 20.696 sec. to 21.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16422 ( -0.496886 0.16275 )
Epeak [keV] : 9994.96 ( )
Norm@50keV : 2.58028E-02 ( -0.00194562 0.0208835 )
------------------------------------------------------------
# Chi-Squared = 44.37 using 59 PHA bins.
# Reduced chi-squared = 0.7924 for 56 degrees of freedom
# Null hypothesis probability = 8.688949e-01
Photon flux (15-150 keV) in 1 sec: 3.00011 ( -0.23689 0.23767 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.6249e-07 ( -1.1364e-08 2.1971e-08 ) ergs/cm2
Band function
Time interval is from 20.696 sec. to 21.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94192 ( -34.8734 -34.8734 )
beta : -1.17154 ( -0.144851 0.136028 )
Epeak [keV] : 20.4591 ( -20.4463 6.57445 )
Norm@50keV : 5959.27 ( -4592.48 202499 )
------------------------------------------------------------
# Chi-Squared = 44.30 using 59 PHA bins.
# Reduced chi-squared = 0.8055 for 55 degrees of freedom
# Null hypothesis probability = 8.485092e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Dec 22 07:55:28 EST 2009