batgrbproduct Analysis for Trigger=177533
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 09:37:32 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger177533/SDC
======================================================================
Trigger: 00177533 Segment: 000
BAT Trigger Time: 159093448.192 [s; MET]
Trigger Stop: 159093464.576 [s; MET]
UTC: 2006-01-16T08:37:27.233480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 84.6992896947215 Dec: -5.4486871468953 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.58
Image Trigger?: NO
Rate S/N Ratio: 10.4403065089106 [ if not an image trigger ]
Image S/N Ratio: 6.58
Flight Position: [ source = BAT ]
RA: 84.6992896947215 Dec: -5.4486871468953 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 84.7021436570672 Dec: -5.44080108992277 [deg; J2000]
{ 05h 38m 48.5s , -05d 26' 26.9" }
+/- 1.72012320014265 [arcmin] (estimated 90% radius based on SNR)
+/- 0.558026736207906 [arcmin] (formal 1-sigma fit error)
SNR: 14.0153753177176
RA = 5h 38m 48.5s (84.702144 deg.)
Dec = -5d 26' 27" (-5.440801 deg.)
Angular difference between Flight and Ground position is 0.502933 arcmin
Partial Coding Fraction: 0.2050781 [ including projection effects ]
Duration
T90: 103.759999960661 +/- 29.6672543980773
Measured from: -29.7520000040531
to: 74.0079999566078 [s; relative to TRIGTIME]
T50: 26.6399999856949 +/- 6.78174017965447
Measured from: 5.15999999642372
to: 31.7999999821186 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 36.3959999978542
to: 37.3959999978542 [s; relative to TRIGTIME]
Total Fluence
Measured from: -35.7360000014305
to: 77.2879999876022 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.840482 1.189463 1.048198 0.375978
0.118532 0.120494 0.104912 0.088499 [error]
Peak 0.028254 0.053939 0.041122 0.016283
0.012267 0.012271 0.010390 0.008837 [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 2.86e-07 5.57e-07 8.40e-07 2.75e-06 2.36e-06 4.49e-06 erg/cm2
Error 5.40e-08 6.32e-08 1.02e-07 7.41e-07 2.55e-07 8.07e-07 erg/cm2
Peak flux Power-law 4.45e-01 3.81e-01 2.23e-01 1.96e-01 1.13e+00 1.25e+00 ph/cm2/s
Error 1.73e-01 1.05e-01 6.78e-02 1.05e-01 3.11e-01 3.26e-01 ph/cm2/s
Fluence Cutoff-PL 2.70e-07 5.74e-07 8.66e-07 1.80e-06 2.32e-06 3.51e-06 erg/cm2
Error 6.49e-08 7.42e-08 1.18e-07 1.34e-06 2.70e-07 1.36e-06 erg/cm2
Peak flux Cutoff-PL 3.51e-01 4.32e-01 2.78e-01 1.03e-01 1.13e+00 1.16e+00 ph/cm2/s
Error 1.98e-01 1.29e-01 9.92e-02 1.24e-01 3.11e-01 3.26e-01 ph/cm2/s
Fluence Band 2.67e-07 5.72e-07 8.64e-07 1.80e-06 2.32e-06 3.66e-06 erg/cm2
Error 6.42e-08 7.44e-08 1.19e-07 1.34e-06 2.70e-07 1.37e-06 erg/cm2
Peak flux Band 3.51e-01 4.32e-01 2.78e-01 1.03e-01 1.13e+00 1.16e+00 ph/cm2/s
Error 1.98e-01 1.29e-01 9.92e-02 9.29e-02 3.11e-01 3.09e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.407 0.177 - - 2.16e-03 2.18e-04 61.303 57
CPL 1.037 0.631 138.4 5000.0 3.26e-03 2.62e-03 60.754 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.771 0.361 - - 8.32e-03 2.20e-03 69.372 57
CPL 0.618 1.652 68.9 4978.6 2.92e-02 1.38e-01 67.288 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: 67.776000 sec.
T50 in the 50-300 keV band: 28.608000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 113.024 -35.736 77.288
T90 103.760 -29.752 74.008
T50 26.640 5.160 31.800
Peak 1.000 36.396 37.396
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
84.7021 -5.4408 0.0137 37.9 128.0 3.3685 14.0 TRIG_00177533
------------------------------------------
Foreground time interval of the image:
-35.736 70.213 (delta_t = 105.949 [sec])
Background time interval of the image:
-299.192 -35.736 (delta_t = 263.456 [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 -35.736 sec. to 77.288 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40718 ( -0.177425 0.175722 )
Norm@50keV : 2.164065E-03 ( -2.176263E-04 2.175558E-04) )
------------------------------------------------------------
Chi-Squared = 61.30334 using 59 PHA bins.
Reduced chi-squared = 1.075497 for 57 degrees of freedom
Null hypothesis probability = 0.324
Photon flux (15-150 keV) in 113.0 sec: 0.263977 ( -0.028154 0.028251 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35986e-06 ( -2.54374e-07 2.54725e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -35.736 sec. to 77.288 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03678 ( -0.736502 0.525414 )
Epeak [keV] : 138.389 ( -138.379 9861.61 )
Norm@50keV : 3.256295E-03 ( -1.279875E-03 3.963160E-03) )
------------------------------------------------------------
Chi-Squared = 60.75414 using 59 PHA bins.
Reduced chi-squared = 1.084895 for 56 degrees of freedom
Null hypothesis probability = 0.309
Photon flux (15-150 keV) in 113.0 sec: 0.260840 ( -0.029089 0.028949 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32479e-06 ( -2.71946e-07 2.67064e-07 ) ergs/cm2
Band function
Time interval is from -35.736 sec. to 77.288 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.853860 ( -9.14614 4.08325 )
beta : -1.62575 ( -8.37425 0.366628 )
Epeak [keV] : 97.1656 ( -97.0656 9902.23 )
Norm@50keV : 4.196838E-03 ( -4.196838E-03 91.2433 )
------------------------------------------------------------
Chi-Squared = 60.50014 using 59 PHA bins.
Reduced chi-squared = 1.100003 for 55 degrees of freedom
Null hypothesis probability = 0.284
Photon flux (15-150 keV) in 113.0 sec: 0.259496 ( -0.029315 0.029458 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32317e-06 ( -2.72353e-07 2.67946e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 36.392 sec. to 37.400 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77120 ( -0.345747 0.377004 )
Norm@50keV : 8.322970E-03 ( -2.210666E-03 2.194633E-03) )
------------------------------------------------------------
Chi-Squared = 69.37248 using 59 PHA bins.
Reduced chi-squared = 1.217061 for 57 degrees of freedom
Null hypothesis probability = 0.126
Photon flux (15-150 keV) in 1.008 sec: 1.13431 ( -0.310688 0.31226 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.73379e-08 ( -2.06781e-08 2.06803e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 36.392 sec. to 37.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.618460 ( -1.98510 1.31900 )
Epeak [keV] : 68.8849 ( -26.1479 9931.12 )
Norm@50keV : 2.923360E-02 ( -2.923360E-02 0.246562 )
------------------------------------------------------------
Chi-Squared = 67.28822 using 59 PHA bins.
Reduced chi-squared = 1.201575 for 56 degrees of freedom
Null hypothesis probability = 0.144
Photon flux (15-150 keV) in 1.008 sec: 1.13314 ( -0.309516 0.31293 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.10028e-08 ( -2.19481e-08 2.17931e-08 ) ergs/cm2
Band function
Time interval is from 36.392 sec. to 37.400 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.618266 ( -9.38173 1.70635 )
beta : -9.02769 ( -0.972307 7.43473 )
Epeak [keV] : 68.8387 ( -24.5809 100.348 )
Norm@50keV : 2.925416E-02 ( -2.925416E-02 0.299372 )
------------------------------------------------------------
Chi-Squared = 67.28822 using 59 PHA bins.
Reduced chi-squared = 1.223422 for 55 degrees of freedom
Null hypothesis probability = 0.124
Photon flux (15-150 keV) in 1.008 sec: 1.13308 ( -0.30944 0.31298 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.0962e-08 ( -2.19536e-08 2.17774e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 09:48:09 EST 2007