batgrbproduct Analysis for Trigger=278809
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): Thu Dec 13 20:28:38 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger278809/GCN5_download_cron
======================================================================
Trigger: 00278809 Segment: 000
BAT Trigger Time: 200237093.728 [s; MET]
Trigger Stop: 200237094.112 [s; MET]
UTC: 2007-05-07T13:24:51.788760 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 243.009888106209 Dec: 59.4878236368108 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.54
Image Trigger?: NO
Rate S/N Ratio: 11.3578166916005 [ if not an image trigger ]
Image S/N Ratio: 6.54
Flight Position: [ source = BAT ]
RA: 243.009888106209 Dec: 59.4878236368108 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 243.117295859796 Dec: 59.4932480019573 [deg; J2000]
{ 16h 12m 28.2s , +59d 29' 35.7" }
+/- 7.24458248396604 [arcmin] (estimated 90% radius based on SNR)
+/- 6.37602706250074 [arcmin] (formal 1-sigma fit error)
SNR: 1.79691636345887
RA = 16h 12m 28.2s (243.117296 deg.)
Dec = 59d 29' 36" (59.493248 deg.)
Angular difference between Flight and Ground position is 3.287878 arcmin
Partial Coding Fraction: 0.7421875 [ 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 0.003397 0.003281 -0.001509 0.005714
0.003492 0.003484 0.003245 0.003386 [error]
Peak 0.003397 0.003281 -0.001509 0.005714
0.003492 0.003484 0.003245 0.003386 [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 7.02e-12 1.82e-11 1.01e-13 5.59e-16 8.45e-10 1.15e-07 erg/cm2
Error 1.14e-09 1.74e-09 8.69e-08 5.45e-09 1.17e-07 0.00e+00 erg/cm2
Peak flux Power-law 7.87e-02 1.05e-03 2.90e-06 8.02e-09 8.08e-02 1.52e-01 ph/cm2/s
Error 1.43e-01 5.44e-02 3.73e-02 5.17e-01 1.87e-01 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 7.88e-10 1.81e-11 1.00e-13 5.52e-16 8.42e-10 1.88e-09 erg/cm2
Error 1.61e-09 1.14e-09 1.75e-09 8.73e-08 6.31e-09 0.00e+00 erg/cm2
Peak flux Cutoff-PL 7.95e-02 1.04e-03 2.87e-06 7.92e-09 8.05e-02 8.05e-02 ph/cm2/s
Error 1.43e-01 5.44e-02 3.73e-02 6.51e-01 1.87e-01 2.19e-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 1.48e-01 2.89e-02 2.25e-03 1.82e-01 0.00e+00 0.00e+00 ph/cm2/s
Error 7.00e-02 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 6.100 0.000 - - 3.04e-05 0.00e+00 71.617 57
CPL 1.662 0.000 3.0 0.0 2.61e-02 0.00e+00 71.701 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.100 0.000 - - 3.04e-05 0.00e+00 71.617 57
CPL 1.662 0.000 3.0 0.0 2.61e-02 0.00e+00 71.701 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
243.1173 +59.4932 0.1068 34.4 -14.6 0.0126 1.8 TRIG_00278809
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-239.760 -5.760 (delta_t = 234.000 [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: 6.10016 ( )
Norm@50keV : 3.038532E-05 ( )
------------------------------------------------------------
Chi-Squared = 71.61663 using 59 PHA bins.
Reduced chi-squared = 1.256432 for 57 degrees of freedom
Null hypothesis probability = 9.207E-02
Photon flux (15-150 keV) in 0.3840 sec: 8.078037E-02 ( -0.0767923 0.296859 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.449e-10 ( -8.449e-10 1.00483e-08 ) 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: 1.66213 ( )
Epeak [keV] : 3.03551 ( )
Norm@50keV : 2.612753E-02 ( )
------------------------------------------------------------
Chi-Squared = 71.70132 using 59 PHA bins.
Reduced chi-squared = 1.280381 for 56 degrees of freedom
Null hypothesis probability = 7.698E-02
Photon flux (15-150 keV) in 0.3840 sec: 8.050033E-02 ( -0.0765253 0.29694 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.42227e-10 ( -8.42227e-10 1.17777e-08 ) 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 : -2.70605 ( -7.29395 7.70605 )
beta : -4.99532 ( -20.0000 0.00000 )
Epeak [keV] : 7.11893 ( -7.01893 9992.88 )
Norm@50keV : 1.22578 ( -475.513 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 71.62757 using 59 PHA bins.
Reduced chi-squared = 1.302320 for 55 degrees of freedom
Null hypothesis probability = 6.538E-02
Photon flux (15-150 keV) in 0.3840 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 -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.10016 ( )
Norm@50keV : 3.038532E-05 ( )
------------------------------------------------------------
Chi-Squared = 71.61663 using 59 PHA bins.
Reduced chi-squared = 1.256432 for 57 degrees of freedom
Null hypothesis probability = 9.207E-02
Photon flux (15-150 keV) in 0.3840 sec: 8.078037E-02 ( -0.0767923 0.296859 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.449e-10 ( -8.449e-10 1.00483e-08 ) 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: 1.66213 ( )
Epeak [keV] : 3.03551 ( )
Norm@50keV : 2.612753E-02 ( )
------------------------------------------------------------
Chi-Squared = 71.70132 using 59 PHA bins.
Reduced chi-squared = 1.280381 for 56 degrees of freedom
Null hypothesis probability = 7.698E-02
Photon flux (15-150 keV) in 0.3840 sec: 8.050033E-02 ( -0.0765253 0.29694 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.42227e-10 ( -8.42227e-10 1.17777e-08 ) 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 : -2.70605 ( -7.29395 7.70605 )
beta : -4.99532 ( -20.0000 0.00000 )
Epeak [keV] : 7.11893 ( -7.01893 9992.88 )
Norm@50keV : 1.22578 ( -475.513 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 71.62757 using 59 PHA bins.
Reduced chi-squared = 1.302320 for 55 degrees of freedom
Null hypothesis probability = 6.538E-02
Photon flux (15-150 keV) in 0.3840 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Dec 13 20:49:52 EST 2007