batgrbproduct Analysis for Trigger=206257
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 19:02:23 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger206257/SDC
======================================================================
Trigger: 00206257 Segment: 000
BAT Trigger Time: 167272764.48 [s; MET]
Trigger Stop: 167272764.736 [s; MET]
UTC: 2006-04-21T00:39:23.334720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 343.630155574858 Dec: 62.7269646414008 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.34
Image Trigger?: NO
Rate S/N Ratio: 25.5929677841395 [ if not an image trigger ]
Image S/N Ratio: 8.34
Flight Position: [ source = BAT ]
RA: 343.630155574858 Dec: 62.7269646414008 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 343.634671649513 Dec: 62.7329025673368 [deg; J2000]
{ 22h 54m 32.3s , +62d 43' 58.4" }
+/- 0.836595150153277 [arcmin] (estimated 90% radius based on SNR)
+/- 0.21285042826586 [arcmin] (formal 1-sigma fit error)
SNR: 39.2473869988507
RA = 22h 54m 32.3s (343.634672 deg.)
Dec = 62d 43' 58" (62.732903 deg.)
Angular difference between Flight and Ground position is 0.377288 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 12.2280000150204 +/- 3.32943478934868
Measured from: -1.00799998641014
to: 11.2200000286102 [s; relative to TRIGTIME]
T50: 6.26399999856949 +/- 0.871320833544894
Measured from: 1.19600000977516
to: 7.46000000834465 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.27600002288818
to: 3.27600002288818 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.65599998831749
to: 16.8760000169277 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.579423 0.724552 0.579348 0.086229
0.025533 0.026465 0.023846 0.020347 [error]
Peak 0.069924 0.137994 0.125302 0.029689
0.006265 0.007183 0.006847 0.005135 [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 1.77e-07 3.17e-07 4.34e-07 1.23e-06 1.25e-06 2.16e-06 erg/cm2
Error 1.44e-08 1.49e-08 2.37e-08 1.51e-07 5.70e-08 1.66e-07 erg/cm2
Peak flux Power-law 7.95e-01 9.38e-01 7.98e-01 1.15e+00 2.94e+00 3.69e+00 ph/cm2/s
Error 8.87e-02 6.45e-02 5.33e-02 1.61e-01 1.78e-01 2.24e-01 ph/cm2/s
Fluence Cutoff-PL 1.65e-07 3.25e-07 4.46e-07 7.99e-07 1.23e-06 1.71e-06 erg/cm2
Error 1.80e-08 1.67e-08 2.65e-08 2.30e-07 4.69e-08 3.30e-07 erg/cm2
Peak flux Cutoff-PL 7.26e-01 9.74e-01 8.41e-01 7.43e-01 2.91e+00 3.28e+00 ph/cm2/s
Error 1.05e-01 7.39e-02 6.56e-02 2.90e-01 1.81e-01 3.33e-01 ph/cm2/s
Fluence Band 1.64e-07 3.24e-07 4.45e-07 7.99e-07 1.23e-06 1.73e-06 erg/cm2
Error 1.78e-08 1.68e-08 2.65e-08 3.28e-07 6.25e-08 3.31e-07 erg/cm2
Peak flux Band 6.48e-01 1.05e+00 7.99e-01 9.90e-01 2.87e+00 3.49e+00 ph/cm2/s
Error 1.23e-01 9.19e-02 5.18e-02 1.52e-01 1.85e-01 2.44e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.546 0.080 - - 6.48e-03 2.76e-04 59.210 57
CPL 1.223 0.318 128.0 410.5 9.22e-03 3.21e-03 55.939 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.233 0.099 - - 2.49e-02 1.46e-03 64.271 57
CPL 0.800 0.398 150.2 281.9 4.02e-02 1.80e-02 60.379 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: 7.616000 sec.
T50 in the 50-300 keV band: 1.984000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 20.532 -3.656 16.876
T90 12.228 -1.008 11.220
T50 6.264 1.196 7.460
Peak 1.000 2.276 3.276
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
343.6347 +62.7329 0.0049 28.9 -178.9 1.9539 39.2 TRIG_00206257
------------------------------------------
Foreground time interval of the image:
-3.656 14.525 (delta_t = 18.181 [sec])
Background time interval of the image:
-239.480 -3.656 (delta_t = 235.824 [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 -3.656 sec. to 16.876 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54620 ( -7.958460E-02 7.972574E-02) )
Norm@50keV : 6.480608E-03 ( -2.761763E-04 2.759323E-04) )
------------------------------------------------------------
Chi-Squared = 59.20979 using 59 PHA bins.
Reduced chi-squared = 1.038768 for 57 degrees of freedom
Null hypothesis probability = 0.395
Photon flux (15-150 keV) in 20.53 sec: 0.819507 ( -0.037384 0.037503 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25324e-06 ( -5.69872e-08 5.71001e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.656 sec. to 16.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22304 ( -0.330031 0.305842 )
Epeak [keV] : 128.010 ( -39.5736 781.404 )
Norm@50keV : 9.224376E-03 ( -2.561530E-03 3.863228E-03) )
------------------------------------------------------------
Chi-Squared = 55.93913 using 59 PHA bins.
Reduced chi-squared = 0.9989130 for 56 degrees of freedom
Null hypothesis probability = 0.477
Photon flux (15-150 keV) in 20.53 sec: 0.802862 ( -0.040412 0.04024 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22778e-06 ( -3.14355e-08 6.23948e-08 ) ergs/cm2
Band function
Time interval is from -3.656 sec. to 16.876 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22395 ( -0.305054 0.330989 )
beta : -8.52090 ( -1.47910 6.96232 )
Epeak [keV] : 128.224 ( -39.8121 797.737 )
Norm@50keV : 9.213898E-03 ( -2.551258E-03 3.871550E-03) )
------------------------------------------------------------
Chi-Squared = 55.93916 using 59 PHA bins.
Reduced chi-squared = 1.017076 for 55 degrees of freedom
Null hypothesis probability = 0.439
Photon flux (15-150 keV) in 20.53 sec: 0.802873 ( -0.040384 0.040474 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22659e-06 ( -6.25693e-08 6.24194e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.276 sec. to 3.276 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23253 ( -9.935594E-02 9.850097E-02) )
Norm@50keV : 2.494464E-02 ( -1.456907E-03 1.456857E-03) )
------------------------------------------------------------
Chi-Squared = 64.27113 using 59 PHA bins.
Reduced chi-squared = 1.127564 for 57 degrees of freedom
Null hypothesis probability = 0.237
Photon flux (15-150 keV) in 1.000 sec: 2.94209 ( -0.17829 0.17851 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50843e-07 ( -1.6002e-08 1.5984e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.276 sec. to 3.276 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.799921 ( -0.418330 0.377339 )
Epeak [keV] : 150.204 ( -49.1570 514.718 )
Norm@50keV : 4.018359E-02 ( -1.336870E-02 2.256481E-02) )
------------------------------------------------------------
Chi-Squared = 60.37906 using 59 PHA bins.
Reduced chi-squared = 1.078198 for 56 degrees of freedom
Null hypothesis probability = 0.321
Photon flux (15-150 keV) in 1.000 sec: 2.90620 ( -0.18064 0.18116 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46166e-07 ( -1.6938e-08 1.6816e-08 ) ergs/cm2
Band function
Time interval is from 2.276 sec. to 3.276 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.472714 ( -2.76965 4.43478 )
beta : -1.39264 ( -0.203964 0.152874 )
Epeak [keV] : 50.0500 ( -20.6521 34.8756 )
Norm@50keV : 0.288785 ( -21.2977 225.077 )
------------------------------------------------------------
Chi-Squared = 56.55374 using 59 PHA bins.
Reduced chi-squared = 1.028250 for 55 degrees of freedom
Null hypothesis probability = 0.417
Photon flux (15-150 keV) in 1.000 sec: 2.86863 ( -0.18099 0.18812 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46015e-07 ( -1.6945e-08 1.6788e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 19:29:05 EST 2007