batgrbproduct Analysis for Trigger=215279
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): Tue Jan 1 18:26:00 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger215279/GCN5_download_cron
======================================================================
Trigger: 00215279 Segment: 000
BAT Trigger Time: 172410064.64 [s; MET]
Trigger Stop: 172410064.768 [s; MET]
UTC: 2006-06-19T11:41:03.374560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 33.3625578902933 Dec: 30.0767784991684 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: NO
Rate S/N Ratio: 8.42614977317636 [ if not an image trigger ]
Image S/N Ratio: 7.19
Flight Position: [ source = BAT ]
RA: 33.3625578902933 Dec: 30.0767784991684 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 33.359582763431 Dec: 30.0942960333966 [deg; J2000]
{ 02h 13m 26.3s , +30d 05' 39.5" }
+/- 3.13006519544505 [arcmin] (estimated 90% radius based on SNR)
+/- 1.92301893095861 [arcmin] (formal 1-sigma fit error)
SNR: 5.95915902438517
RA = 2h 13m 26.3s (33.359583 deg.)
Dec = 30d 5' 39" (30.094296 deg.)
Angular difference between Flight and Ground position is 1.062341 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 4.77200001478195 +/- 0.863712935556445
Measured from: -113.815999984741
to: -109.043999969959 [s; relative to TRIGTIME]
T50: 2.28000000119209 +/- 1.46497373576984
Measured from: -111.987999975681
to: -109.707999974489 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -109.831999987364
to: -108.831999987364 [s; relative to TRIGTIME]
Total Fluence
Measured from: -113.951999992132
to: -108.77199998498 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.060845 0.029708 0.043186 0.059570
0.016864 0.018722 0.018138 0.020472 [error]
Peak 0.021691 0.023716 0.003304 0.021706
0.007452 0.008289 0.008235 0.009129 [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 1.16e-08 2.11e-08 2.95e-08 8.60e-08 8.46e-08 1.51e-07 erg/cm2
Error 1.07e-08 9.74e-09 2.43e-08 1.73e-07 4.59e-08 1.80e-07 erg/cm2
Peak flux Power-law 1.64e-01 1.59e-01 1.07e-01 1.13e-01 4.76e-01 5.43e-01 ph/cm2/s
Error 1.19e-01 7.34e-02 6.78e-02 1.86e-01 3.43e-01 2.53e-01 ph/cm2/s
Fluence Cutoff-PL 1.18e-08 2.12e-08 2.94e-08 8.48e-08 8.45e-08 1.42e-07 erg/cm2
Error 1.07e-08 9.75e-09 2.44e-08 1.72e-07 4.60e-08 1.79e-07 erg/cm2
Peak flux Cutoff-PL 1.64e-01 1.59e-01 1.07e-01 1.12e-01 4.76e-01 5.42e-01 ph/cm2/s
Error 1.19e-01 7.34e-02 6.79e-02 1.84e-01 3.43e-01 2.52e-01 ph/cm2/s
Fluence Band 1.28e-08 2.14e-08 2.79e-08 7.49e-08 8.23e-08 1.17e-07 erg/cm2
Error 9.57e-09 9.53e-09 1.53e-08 1.79e-07 4.23e-08 0.00e+00 erg/cm2
Peak flux Band 1.58e-01 1.77e-01 1.00e-01 8.38e-02 4.82e-01 5.15e-01 ph/cm2/s
Error 8.05e-02 7.61e-02 4.50e-02 1.43e-01 2.07e-01 2.48e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.519 1.136 - - 1.73e-03 8.71e-04 65.678 57
CPL 1.509 1.143 9999.0 5000.0 1.74e-03 8.78e-04 65.682 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.568 0.963 - - 3.74e-03 1.86e-03 60.198 57
CPL 1.552 2.534 911.2 0.0 3.84e-03 2.77e-03 60.220 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 5.180 -113.952 -108.772
T90 4.772 -113.816 -109.044
T50 2.280 -111.988 -109.708
Peak 1.000 -109.832 -108.832
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
33.3596 +30.0943 0.0321 38.6 -164.4 0.2228 6.0 TRIG_00215279
------------------------------------------
Foreground time interval of the image:
-113.952 -108.772 (delta_t = 5.180 [sec])
Background time interval of the image:
-177.439 -113.952 (delta_t = 63.487 [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 -113.952 sec. to -108.772 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51886 ( -1.08305 1.18923 )
Norm@50keV : 1.727168E-03 ( -9.670417E-04 7.748486E-04) )
------------------------------------------------------------
Chi-Squared = 65.67782 using 59 PHA bins.
Reduced chi-squared = 1.152242 for 57 degrees of freedom
Null hypothesis probability = 0.201
Photon flux (15-150 keV) in 5.180 sec: 0.216802 ( -0.091532 0.091791 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.46272e-08 ( -4.49133e-08 4.69805e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -113.952 sec. to -108.772 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50866 ( -1.08172 1.20379 )
Epeak [keV] : 9999.04 ( -9999.03 0.959961 )
Norm@50keV : 1.736183E-03 ( -9.795887E-04 7.754462E-04) )
------------------------------------------------------------
Chi-Squared = 65.68233 using 59 PHA bins.
Reduced chi-squared = 1.172899 for 56 degrees of freedom
Null hypothesis probability = 0.176
Photon flux (15-150 keV) in 5.180 sec: 0.216688 ( -0.091505 0.091765 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.45485e-08 ( -4.48783e-08 4.70541e-08 ) ergs/cm2
Band function
Time interval is from -113.952 sec. to -108.772 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13348 ( -8.86652 6.04024 )
beta : -1.50459 ( -8.49541 1.06827 )
Epeak [keV] : 46.3783 ( -46.2783 9953.62 )
Norm@50keV : 3.539859E-03 ( -3.539859E-03 64.6533 )
------------------------------------------------------------
Chi-Squared = 65.67547 using 59 PHA bins.
Reduced chi-squared = 1.194099 for 55 degrees of freedom
Null hypothesis probability = 0.154
Photon flux (15-150 keV) in 5.180 sec: 0.218784 ( -0.091724 0.091673 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.23097e-08 ( -4.2219e-08 4.2462e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -109.832 sec. to -108.832 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56788 ( -0.977243 0.948449 )
Norm@50keV : 3.738500E-03 ( -1.942953E-03 1.775712E-03) )
------------------------------------------------------------
Chi-Squared = 60.19785 using 59 PHA bins.
Reduced chi-squared = 1.056103 for 57 degrees of freedom
Null hypothesis probability = 0.361
Photon flux (15-150 keV) in 1.000 sec: 0.475761 ( -0.475761 0.209526 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51412e-08 ( -1.80841e-08 1.97944e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -109.832 sec. to -108.832 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.55249 ( -2.18447 2.88352 )
Epeak [keV] : 911.239 ( )
Norm@50keV : 3.837154E-03 ( -3.742619E-03 1.790959E-03) )
------------------------------------------------------------
Chi-Squared = 60.22008 using 59 PHA bins.
but latest trial -0.630518 gives Chi-Squared = 5.85007
but latest trial 4.43601 gives Chi-Squared = 9.84457
Reduced chi-squared = 1.075359 for 56 degrees of freedom
Null hypothesis probability = 0.326
Photon flux (15-150 keV) in 1.000 sec: 0.475583 ( -0.475583 0.209466 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50725e-08 ( -1.80361e-08 1.98508e-08 ) ergs/cm2
Band function
Time interval is from -109.832 sec. to -108.832 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.712436 ( -9.28756 5.71244 )
beta : -1.63162 ( -8.36838 0.998541 )
Epeak [keV] : 39.3070 ( -39.2070 9960.69 )
Norm@50keV : 1.623791E-02 ( -92.1987 258.461 )
------------------------------------------------------------
Chi-Squared = 60.02780 using 59 PHA bins.
Reduced chi-squared = 1.091414 for 55 degrees of freedom
Null hypothesis probability = 0.299
Photon flux (15-150 keV) in 1.000 sec: 0.481515 ( -0.205799 0.20762 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08911e-08 ( -1.64423e-08 2.28051e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 18:40:50 EST 2008