batgrbproduct Analysis for Trigger=261664
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 14:52:39 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger261664/GCN5_download_cron
======================================================================
Trigger: 00261664 Segment: 000
BAT Trigger Time: 193886102.464 [s; MET]
Trigger Stop: 193886105.536 [s; MET]
UTC: 2007-02-23T01:15:00.682000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 153.452397388761 Dec: 43.1212182236162 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.24
Image Trigger?: NO
Rate S/N Ratio: 8.42614977317636 [ if not an image trigger ]
Image S/N Ratio: 7.24
Flight Position: [ source = BAT ]
RA: 153.452397388761 Dec: 43.1212182236162 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 153.453594967308 Dec: 43.1305871631864 [deg; J2000]
{ 10h 13m 48.9s , +43d 07' 50.1" }
+/- 1.23853511884221 [arcmin] (estimated 90% radius based on SNR)
+/- 0.630086956963399 [arcmin] (formal 1-sigma fit error)
SNR: 22.4074378533207
RA = 10h 13m 48.9s (153.453595 deg.)
Dec = 43d 7' 50" (43.130587 deg.)
Angular difference between Flight and Ground position is 0.564577 arcmin
Partial Coding Fraction: 0.828125 [ including projection effects ]
Duration
T90: 88.5240000188351 +/- 8.08530616043297
Measured from: 1.04399999976158
to: 89.5680000185966 [s; relative to TRIGTIME]
T50: 45.8280000090599 +/- 7.29489684259976
Measured from: 12.5240000188351
to: 58.352000027895 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 34.3480000197887
to: 35.3480000197887 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.39599999785423
to: 98.5040000081062 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.011571 1.172141 0.672353 0.045826
0.055480 0.057319 0.054151 0.056952 [error]
Peak 0.024080 0.027333 0.027254 0.017039
0.005864 0.006178 0.005645 0.005828 [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 3.35e-07 4.93e-07 5.41e-07 1.12e-06 1.71e-06 2.50e-06 erg/cm2
Error 3.30e-08 3.00e-08 5.33e-08 2.30e-07 1.21e-07 2.77e-07 erg/cm2
Peak flux Power-law 2.21e-01 2.28e-01 1.66e-01 1.95e-01 6.90e-01 8.09e-01 ph/cm2/s
Error 8.05e-02 5.16e-02 4.70e-02 1.15e-01 1.48e-01 1.80e-01 ph/cm2/s
Fluence Cutoff-PL 3.18e-07 5.16e-07 5.37e-07 5.41e-07 1.63e-06 1.90e-06 erg/cm2
Error 3.84e-08 3.87e-08 5.82e-08 3.03e-07 1.48e-07 5.01e-07 erg/cm2
Peak flux Cutoff-PL 2.05e-01 2.40e-01 1.71e-01 1.09e-01 6.77e-01 7.25e-01 ph/cm2/s
Error 9.73e-02 6.58e-02 5.26e-02 1.61e-01 1.57e-01 2.28e-01 ph/cm2/s
Fluence Band 3.12e-07 5.18e-07 5.24e-07 7.92e-07 1.64e-06 2.14e-06 erg/cm2
Error 3.96e-08 4.20e-08 6.50e-08 4.59e-07 1.51e-07 3.91e-07 erg/cm2
Peak flux Band 7.55e-01 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 1.866 0.120 - - 1.83e-03 1.28e-04 50.849 57
CPL 1.347 0.000 55.7 4978.1 3.51e-03 2.24e-03 48.580 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.456 0.387 - - 5.59e-03 1.24e-03 60.575 57
CPL 0.973 1.609 102.2 5000.0 1.00e-02 7.79e-02 60.338 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: 43.136000 sec.
T50 in the 50-300 keV band: 28.608000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 101.900 -3.396 98.504
T90 88.524 1.044 89.568
T50 45.828 12.524 58.352
Peak 1.000 34.348 35.348
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
153.4536 +43.1306 0.0085 28.2 173.4 1.8513 22.4 TRIG_00261664
------------------------------------------
Foreground time interval of the image:
-3.396 38.637 (delta_t = 42.033 [sec])
Background time interval of the image:
-239.464 -3.396 (delta_t = 236.068 [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 -3.396 sec. to 98.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86557 ( -0.118983 0.121300 )
Norm@50keV : 1.826364E-03 ( -1.289810E-04 1.274772E-04) )
------------------------------------------------------------
Chi-Squared = 50.84881 using 59 PHA bins.
Reduced chi-squared = 0.8920844 for 57 degrees of freedom
Null hypothesis probability = 0.704
Photon flux (15-150 keV) in 101.9 sec: 0.258355 ( -0.01602 0.016045 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71095e-06 ( -1.19987e-07 1.21516e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.396 sec. to 98.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34691 ( )
Epeak [keV] : 55.7408 ( -14.7871 9941.39 )
Norm@50keV : 3.507087E-03 ( -1.284008E-03 3.204756E-03) )
------------------------------------------------------------
Chi-Squared = 48.58003 using 59 PHA bins.
Reduced chi-squared = 0.8675006 for 56 degrees of freedom
Null hypothesis probability = 0.749
Photon flux (15-150 keV) in 101.9 sec: 0.252086 ( -0.017472 0.01735 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63209e-06 ( -1.47246e-07 1.48591e-07 ) ergs/cm2
Band function
Time interval is from -3.396 sec. to 98.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22259 ( -8.77741 2.38947 )
beta : -2.15339 ( -7.84661 0.341531 )
Epeak [keV] : 48.2864 ( -48.1864 43.8763 )
Norm@50keV : 4.310194E-03 ( -1.573844E-02 127.839 )
------------------------------------------------------------
Chi-Squared = 48.30437 using 59 PHA bins.
Reduced chi-squared = 0.8782613 for 55 degrees of freedom
Null hypothesis probability = 0.726
Photon flux (15-150 keV) in 101.9 sec: 0.251878 ( -0.016923 0.017343 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63701e-06 ( -1.46797e-07 1.54735e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 34.348 sec. to 35.348 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45592 ( -0.384689 0.389795 )
Norm@50keV : 5.593254E-03 ( -1.256453E-03 1.231954E-03) )
------------------------------------------------------------
Chi-Squared = 60.57494 using 59 PHA bins.
Reduced chi-squared = 1.062718 for 57 degrees of freedom
Null hypothesis probability = 0.348
Photon flux (15-150 keV) in 1.000 sec: 0.690307 ( -0.148349 0.148555 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.34619e-08 ( -1.31424e-08 1.35498e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 34.348 sec. to 35.348 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.972964 ( -2.36511 0.853667 )
Epeak [keV] : 102.217 ( -102.207 9897.78 )
Norm@50keV : 1.002120E-02 ( -1.002120E-02 0.145794 )
------------------------------------------------------------
Chi-Squared = 60.33817 using 59 PHA bins.
Reduced chi-squared = 1.077467 for 56 degrees of freedom
Null hypothesis probability = 0.322
Photon flux (15-150 keV) in 1.000 sec: 0.677254 ( -0.158768 0.154853 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.12086e-08 ( -1.49367e-08 1.50811e-08 ) ergs/cm2
Band function
Time interval is from 34.348 sec. to 35.348 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.906765 ( -9.09324 4.27099 )
beta : -1.90542 ( -8.09458 0.808440 )
Epeak [keV] : 95.8348 ( -85.7348 577.674 )
Norm@50keV : 1.078121E-02 ( -1.232359E-02 43309.2 )
------------------------------------------------------------
Chi-Squared = 60.23908 using 59 PHA bins.
Reduced chi-squared = 1.095256 for 55 degrees of freedom
Null hypothesis probability = 0.292
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Dec 13 15:15:49 EST 2007