batgrbproduct Analysis for Trigger=206476
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): Mon Dec 31 19:29:58 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger206476/GCN5_download_cron
======================================================================
Trigger: 00206476 Segment: 000
BAT Trigger Time: 167373416 [s; MET]
Trigger Stop: 167374800 [s; MET]
UTC: 2006-04-22T04:36:54.852380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 166.088260128317 Dec: 38.2119694771691 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.45
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.45
Flight Position: [ source = BAT ]
RA: 166.088260128317 Dec: 38.2119694771691 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 166.197454753048 Dec: 38.2356429182329 [deg; J2000]
{ 11h 04m 47.4s , +38d 14' 08.3" }
+/- 3.88447001569073 [arcmin] (estimated 90% radius based on SNR)
+/- 2.33373244339786 [arcmin] (formal 1-sigma fit error)
SNR: 4.37739609808897
RA = 11h 4m 47.4s (166.197455 deg.)
Dec = 38d 14' 8" (38.235643 deg.)
Angular difference between Flight and Ground position is 5.339394 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 1384 +/-
Measured from: 0
to: 1384 [s; relative to TRIGTIME]
T50: 1384 +/-
Measured from: 0
to: 1384 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1384 second)
Measured from: 0
to: 1384 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1384 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.476964 0.206234 0.241182 0.179342
0.099707 0.101116 0.089409 0.077910 [error]
Peak 0.476964 0.206234 0.241182 0.179342
0.099707 0.101116 0.089409 0.077910 [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 1.22e-07 1.48e-07 1.30e-07 1.95e-07 4.69e-07 5.95e-07 erg/cm2
Error 5.24e-08 5.54e-08 1.19e-07 3.58e-07 2.18e-07 4.61e-07 erg/cm2
Peak flux Power-law 8.29e-03 5.57e-03 2.44e-03 1.48e-03 1.70e-02 1.78e-02 ph/cm2/s
Error 3.66e-03 1.99e-03 1.84e-03 2.46e-03 4.97e-03 5.52e-03 ph/cm2/s
Fluence Cutoff-PL 1.22e-07 1.48e-07 1.30e-07 1.93e-07 4.68e-07 5.92e-07 erg/cm2
Error 5.24e-08 5.56e-08 1.19e-07 3.55e-07 2.18e-07 4.58e-07 erg/cm2
Peak flux Cutoff-PL 8.28e-03 5.56e-03 2.44e-03 1.46e-03 1.70e-02 1.77e-02 ph/cm2/s
Error 3.66e-03 1.99e-03 1.84e-03 2.44e-03 4.97e-03 5.51e-03 ph/cm2/s
Fluence Band 9.96e-08 1.54e-07 1.40e-07 2.29e-07 4.79e-07 8.29e-07 erg/cm2
Error 2.97e-08 3.79e-08 1.19e-07 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 5.85e-03 5.37e-03 2.11e-03 1.52e-03 1.70e-02 1.88e-02 ph/cm2/s
Error 1.67e-03 8.18e-04 9.79e-04 4.92e-03 5.88e-03 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.185 0.954 - - 1.03e-04 5.79e-05 55.560 57
CPL 2.124 0.000 51.9 4978.1 9.40e-05 0.00e+00 55.169 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.185 0.954 - - 1.03e-04 5.79e-05 55.560 57
CPL 2.124 0.000 51.9 4977.5 9.40e-05 0.00e+00 55.169 0
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 1384.000 0.000 1384.000
T90 1384.000 0.000 1384.000
T50 1384.000 0.000 1384.000
Peak 1384.000 0.000 1384.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
166.1975 +38.2356 0.0438 16.5 149.2 0.9817 4.4 TRIG_00206476
------------------------------------------
Foreground time interval of the image:
468.000 482.996 (delta_t = 14.996 [sec])
492.000 690.140 (delta_t = 198.140 [sec])
691.000 901.900 (delta_t = 210.900 [sec])
904.000 963.043 (delta_t = 59.043 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Multiple GTIs in the spectrum
tstart tstop
468.000000 482.996200
492.000000 690.140000
691.000000 901.900000
904.000000 963.043000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.18509 ( -0.756330 1.15224 )
Norm@50keV : 1.033390E-04 ( -6.391869E-05 5.194097E-05) )
------------------------------------------------------------
Chi-Squared = 55.55987 using 59 PHA bins.
Reduced chi-squared = 0.9747346 for 57 degrees of freedom
Null hypothesis probability = 0.529
Photon flux (15-150 keV) in 483.1 sec: 1.701997E-02 ( -0.00497308 0.00495829 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.68763e-07 ( -2.08447e-07 2.26587e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
468.000000 482.996200
492.000000 690.140000
691.000000 901.900000
904.000000 963.043000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12450 ( )
Epeak [keV] : 51.9399 ( -7.96527 9948.24 )
Norm@50keV : 9.395697E-05 ( )
------------------------------------------------------------
Chi-Squared = 55.16865 using 59 PHA bins.
Reduced chi-squared = 0.9851545 for 56 degrees of freedom
Null hypothesis probability = 0.506
Photon flux (15-150 keV) in 483.1 sec: 1.701028E-02 ( -0.00497395 0.00495694 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.68357e-07 ( -2.08338e-07 2.26795e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
468.000000 482.996200
492.000000 690.140000
691.000000 901.900000
904.000000 963.043000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41089 ( -2.422333E-04 14.9998 )
beta : -1.66928 ( -1.16201 0.750766 )
Epeak [keV] : 7.22388 ( -7.12388 9992.78 )
Norm@50keV : 3.359105E-04 ( -1.414184E-02 6.968682E-03) )
------------------------------------------------------------
Chi-Squared = 56.76665 using 59 PHA bins.
Reduced chi-squared = 1.032121 for 55 degrees of freedom
Null hypothesis probability = 0.409
Photon flux (15-150 keV) in 483.1 sec: 1.703161E-02 ( -0.00492317 0.00491896 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.79134e-07 ( -1.00026e-07 1.38452e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 904.000 sec. to 963.043 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.18509 ( -0.756330 1.15224 )
Norm@50keV : 1.033390E-04 ( -6.391869E-05 5.194097E-05) )
------------------------------------------------------------
Chi-Squared = 55.55987 using 59 PHA bins.
Reduced chi-squared = 0.9747346 for 57 degrees of freedom
Null hypothesis probability = 0.529
Photon flux (15-150 keV) in 483.1 sec: 1.701997E-02 ( -0.00497308 0.00495829 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.68763e-07 ( -2.08447e-07 2.26587e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 904.000 sec. to 963.043 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12450 ( )
Epeak [keV] : 51.9399 ( -6.67652 9948.24 )
Norm@50keV : 9.395697E-05 ( )
------------------------------------------------------------
Chi-Squared = 55.16865 using 59 PHA bins.
but latest trial 45.3541 gives Chi-Squared = 2.23512
Reduced chi-squared = 0.9851545 for 56 degrees of freedom
Null hypothesis probability = 0.506
Photon flux (15-150 keV) in 483.1 sec: 1.701028E-02 ( -0.00497395 0.00495694 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.68357e-07 ( -2.08338e-07 2.26795e-07 ) ergs/cm2
Band function
Time interval is from 904.000 sec. to 963.043 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41089 ( -2.422333E-04 14.9998 )
beta : -1.66928 ( -1.16201 0.750766 )
Epeak [keV] : 7.22388 ( -7.12388 9992.78 )
Norm@50keV : 3.359105E-04 ( -1.414184E-02 6.968682E-03) )
------------------------------------------------------------
Chi-Squared = 56.76665 using 59 PHA bins.
Reduced chi-squared = 1.032121 for 55 degrees of freedom
Null hypothesis probability = 0.409
Photon flux (15-150 keV) in 483.1 sec: 1.703161E-02 ( -0.00492317 0.00491896 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.79134e-07 ( -1.00026e-07 1.38452e-07 ) ergs/cm2
Plot creation:
Mon Dec 31 19:38:03 EST 2007