batgrbproduct Analysis for Trigger=177408
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 09:25:20 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger177408/SDC
======================================================================
Trigger: 00177408 Segment: 000
BAT Trigger Time: 159023281.6 [s; MET]
Trigger Stop: 159023289.792 [s; MET]
UTC: 2006-01-15T13:08:00.643040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 54.0444635355556 Dec: 17.3440437273643 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.48
Image Trigger?: NO
Rate S/N Ratio: 13.856406460551 [ if not an image trigger ]
Image S/N Ratio: 10.48
Flight Position: [ source = BAT ]
RA: 54.0444635355556 Dec: 17.3440437273643 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 54.0102124140686 Dec: 17.3299685478132 [deg; J2000]
{ 03h 36m 02.5s , +17d 19' 47.9" }
+/- 2.10139834124493 [arcmin] (estimated 90% radius based on SNR)
+/- 1.20163790561823 [arcmin] (formal 1-sigma fit error)
SNR: 10.5291209744617
RA = 3h 36m 2.5s (54.010212 deg.)
Dec = 17d 19' 48" (17.329969 deg.)
Angular difference between Flight and Ground position is 2.135761 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 125.043999999762 +/- 15.0870791029542
Measured from: -21.7479999959469
to: 103.296000003815 [s; relative to TRIGTIME]
T50: 92.391999989748 +/- 2.68196046683047
Measured from: 2.94800001382828
to: 95.3400000035763 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 94.9160000085831
to: 95.9160000085831 [s; relative to TRIGTIME]
Total Fluence
Measured from: -49.2119999825954
to: 108.043999999762 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.993470 1.283012 0.748379 0.090389
0.064090 0.065238 0.057355 0.050664 [error]
Peak 0.030892 0.039749 0.032913 0.012700
0.005011 0.005270 0.004710 0.004067 [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 3.27e-07 5.16e-07 6.12e-07 1.41e-06 1.87e-06 2.87e-06 erg/cm2
Error 3.35e-08 3.27e-08 5.72e-08 2.77e-07 1.33e-07 3.26e-07 erg/cm2
Peak flux Power-law 2.64e-01 2.94e-01 2.34e-01 3.08e-01 9.07e-01 1.10e+00 ph/cm2/s
Error 6.77e-02 4.49e-02 3.97e-02 1.13e-01 1.25e-01 1.57e-01 ph/cm2/s
Fluence Cutoff-PL 2.95e-07 5.56e-07 6.19e-07 5.04e-07 1.75e-06 1.97e-06 erg/cm2
Error 3.98e-08 4.26e-08 6.41e-08 3.53e-07 1.53e-07 3.83e-07 erg/cm2
Peak flux Cutoff-PL 2.64e-01 2.94e-01 2.34e-01 3.06e-01 9.07e-01 1.10e+00 ph/cm2/s
Error 6.77e-02 4.49e-02 3.97e-02 1.12e-01 1.25e-01 1.56e-01 ph/cm2/s
Fluence Band 2.92e-07 5.53e-07 6.18e-07 5.03e-07 1.75e-06 2.04e-06 erg/cm2
Error 3.94e-08 4.24e-08 6.40e-08 3.52e-07 1.53e-07 4.52e-07 erg/cm2
Peak flux Band 2.64e-01 2.94e-01 2.34e-01 3.06e-01 9.07e-01 1.10e+00 ph/cm2/s
Error 6.77e-02 5.61e-02 4.05e-02 1.15e-01 1.25e-01 1.56e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.752 0.116 - - 1.29e-03 8.81e-05 52.504 57
CPL 1.026 0.524 62.4 23.1 3.12e-03 2.19e-03 45.764 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.330 0.251 - - 7.56e-03 1.03e-03 48.813 57
CPL 1.279 1.178 669.6 0.0 8.02e-03 1.04e-03 48.912 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: 104.576000 sec.
T50 in the 50-300 keV band: 52.416000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 157.256 -49.212 108.044
T90 125.044 -21.748 103.296
T50 92.392 2.948 95.340
Peak 1.000 94.916 95.916
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
54.0102 +17.3300 0.0183 20.5 -130.9 1.4102 10.5 TRIG_00177408
------------------------------------------
Foreground time interval of the image:
-49.212 56.205 (delta_t = 105.417 [sec])
Background time interval of the image:
-172.995 -49.212 (delta_t = 123.783 [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 -49.212 sec. to 108.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75215 ( -0.115439 0.117369 )
Norm@50keV : 1.285187E-03 ( -8.844386E-05 8.767680E-05) )
------------------------------------------------------------
Chi-Squared = 52.50373 using 59 PHA bins.
Reduced chi-squared = 0.9211181 for 57 degrees of freedom
Null hypothesis probability = 0.644
Photon flux (15-150 keV) in 157.3 sec: 0.173916 ( -0.011149 0.011167 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86526e-06 ( -1.32698e-07 1.33721e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -49.212 sec. to 108.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02610 ( -0.558011 0.490898 )
Epeak [keV] : 62.4163 ( -10.9372 35.1676 )
Norm@50keV : 3.117303E-03 ( -1.381535E-03 2.989009E-03) )
------------------------------------------------------------
Chi-Squared = 45.76443 using 59 PHA bins.
Reduced chi-squared = 0.8172220 for 56 degrees of freedom
Null hypothesis probability = 0.834
Photon flux (15-150 keV) in 157.3 sec: 0.167586 ( -0.011917 0.011899 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75001e-06 ( -1.51716e-07 1.53871e-07 ) ergs/cm2
Band function
Time interval is from -49.212 sec. to 108.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12528 ( -0.400884 0.483459 )
beta : -7.32329 ( -2.67671 5.46567 )
Epeak [keV] : 64.9522 ( -13.6145 34.5013 )
Norm@50keV : 2.766021E-03 ( -1.048360E-03 2.772547E-03) )
------------------------------------------------------------
Chi-Squared = 45.86752 using 59 PHA bins.
Reduced chi-squared = 0.8339548 for 55 degrees of freedom
Null hypothesis probability = 0.805
Photon flux (15-150 keV) in 157.3 sec: 0.167589 ( -0.01192 0.011903 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74839e-06 ( -1.5159e-07 1.5343e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 94.916 sec. to 95.916 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33009 ( -0.252373 0.250555 )
Norm@50keV : 7.557639E-03 ( -1.032718E-03 1.028369E-03) )
------------------------------------------------------------
Chi-Squared = 48.81327 using 59 PHA bins.
Reduced chi-squared = 0.8563732 for 57 degrees of freedom
Null hypothesis probability = 0.771
Photon flux (15-150 keV) in 1.000 sec: 0.906832 ( -0.12517 0.125418 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.41424e-08 ( -1.14365e-08 1.1596e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 94.916 sec. to 95.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27925 ( -0.710186 1.64553 )
Epeak [keV] : 669.610 ( )
Norm@50keV : 8.019053E-03 ( -1.038389E-03 1.034298E-03) )
------------------------------------------------------------
Chi-Squared = 48.91228 using 59 PHA bins.
Reduced chi-squared = 0.8734336 for 56 degrees of freedom
Null hypothesis probability = 0.738
Photon flux (15-150 keV) in 1.000 sec: 0.906551 ( -0.125008 0.125379 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.41627e-08 ( -1.14501e-08 1.15934e-08 ) ergs/cm2
Band function
Time interval is from 94.916 sec. to 95.916 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02155 ( -8.97845 5.93429 )
beta : -1.32882 ( -8.67118 0.251424 )
Epeak [keV] : 53.3409 ( -53.2409 9943.10 )
Norm@50keV : 1.438865E-02 ( -1.438865E-02 303.441 )
------------------------------------------------------------
Chi-Squared = 48.81417 using 59 PHA bins.
Reduced chi-squared = 0.8875304 for 55 degrees of freedom
Null hypothesis probability = 0.709
Photon flux (15-150 keV) in 1.000 sec: 0.906551 ( -0.125008 0.125379 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.40923e-08 ( -1.1507e-08 1.15962e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 09:36:47 EST 2007