batgrbproduct Analysis for Trigger=177666
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 09:48:52 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger177666/SDC
======================================================================
Trigger: 00177666 Segment: 000
BAT Trigger Time: 159173402.56 [s; MET]
Trigger Stop: 159173403.584 [s; MET]
UTC: 2006-01-17T06:50:01.599700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 327.926469426567 Dec: -59.9805138823269 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 24.66
Image Trigger?: NO
Rate S/N Ratio: 217.575274330518 [ if not an image trigger ]
Image S/N Ratio: 24.66
Flight Position: [ source = BAT ]
RA: 327.926469426567 Dec: -59.9805138823269 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 327.912050780618 Dec: -59.9815566379465 [deg; J2000]
{ 21h 51m 38.9s , -59d 58' 53.6" }
+/- 0.632491494587299 [arcmin] (estimated 90% radius based on SNR)
+/- 0.195432614217544 [arcmin] (formal 1-sigma fit error)
SNR: 58.5229171684095
RA = 21h 51m 38.9s (327.912051 deg.)
Dec = -59d 58' 54" (-59.981557 deg.)
Angular difference between Flight and Ground position is 0.437306 arcmin
Partial Coding Fraction: 0.2539062 [ including projection effects ]
Duration
T90: 16.8640000224113 +/- 0.150359566921606
Measured from: 0.111999988555908
to: 16.9760000109673 [s; relative to TRIGTIME]
T50: 9.98800000548363 +/- 0.353836112308116
Measured from: 3.13199999928474
to: 13.1200000047684 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.1200000047684
to: 12.1200000047684 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.15999999642372
to: 26.9799999892712 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 9.216200 12.208586 7.954910 1.735237
0.091904 0.100974 0.086864 0.058860 [error]
Peak 1.240309 1.969112 1.659329 0.375363
0.028798 0.035797 0.033826 0.019301 [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 4.32e-06 6.12e-06 6.43e-06 1.25e-05 2.08e-05 2.97e-05 erg/cm2
Error 1.53e-07 1.27e-07 1.12e-07 5.05e-07 3.35e-07 0.00e+00 erg/cm2
Peak flux Power-law 1.82e+01 1.71e+01 1.12e+01 1.13e+01 5.11e+01 5.78e+01 ph/cm2/s
Error 8.87e-01 5.10e-01 2.93e-01 6.18e-01 1.46e+00 1.43e+00 ph/cm2/s
Fluence Cutoff-PL 3.72e-06 6.14e-06 6.73e-06 8.36e-06 2.02e-05 2.40e-05 erg/cm2
Error 2.19e-07 1.31e-07 1.43e-07 9.91e-07 3.71e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.45e+01 1.74e+01 1.23e+01 6.99e+00 4.83e+01 5.11e+01 ph/cm2/s
Error 1.17e+00 5.46e-01 4.06e-01 8.46e-01 1.56e+00 1.89e+00 ph/cm2/s
Fluence Band 3.71e-06 6.12e-06 6.71e-06 8.37e-06 2.02e-05 2.46e-05 erg/cm2
Error 2.13e-07 1.31e-07 1.43e-07 9.90e-07 3.70e-07 0.00e+00 erg/cm2
Peak flux Band 1.45e+01 1.74e+01 1.23e+01 6.99e+00 4.83e+01 5.11e+01 ph/cm2/s
Error 1.17e+00 5.46e-01 4.06e-01 8.46e-01 1.56e+00 1.89e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.928 0.030 - - 7.75e-02 1.24e-03 66.997 57
CPL 1.495 0.137 70.4 6.1 1.17e-01 1.50e-02 35.575 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.614 0.042 - - 3.96e-01 9.49e-03 99.611 57
CPL 0.879 0.194 92.2 10.1 8.08e-01 1.50e-01 51.669 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: 16.064000 sec.
T50 in the 50-300 keV band: 10.304000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 29.140 -2.160 26.980
T90 16.864 0.112 16.976
T50 9.988 3.132 13.120
Peak 1.000 11.120 12.120
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
327.9121 -59.9816 0.0033 50.1 -159.0 32.8617 58.5 TRIG_00177666
------------------------------------------
Foreground time interval of the image:
-2.160 26.980 (delta_t = 29.140 [sec])
Background time interval of the image:
-299.560 -2.160 (delta_t = 297.400 [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 -2.160 sec. to 26.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92765 ( -3.047240E-02 3.031313E-02) )
Norm@50keV : 7.750490E-02 ( -1.242004E-03 1.239978E-03) )
------------------------------------------------------------
Chi-Squared = 66.99670 using 59 PHA bins.
Reduced chi-squared = 1.175381 for 57 degrees of freedom
Null hypothesis probability = 0.172
Photon flux (15-150 keV) in 29.14 sec: 11.2552 ( -0.2541 0.256 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07725e-05 ( -3.3546e-07 3.35372e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.160 sec. to 26.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49459 ( -0.139194 0.135171 )
Epeak [keV] : 70.4266 ( -5.05356 7.10926 )
Norm@50keV : 0.117035 ( -1.384804E-02 1.619960E-02) )
------------------------------------------------------------
Chi-Squared = 35.57463 using 59 PHA bins.
Reduced chi-squared = 0.6352612 for 56 degrees of freedom
Null hypothesis probability = 0.985
Photon flux (15-150 keV) in 29.14 sec: 10.6415 ( -0.3008 0.305 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02287e-05 ( -3.70865e-07 3.70253e-07 ) ergs/cm2
Band function
Time interval is from -2.160 sec. to 26.980 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49449 ( -0.135237 0.139130 )
beta : -9.34673 ( -0.653268 7.25489 )
Epeak [keV] : 70.4049 ( -5.04575 7.11169 )
Norm@50keV : 0.117032 ( -1.386220E-02 1.619025E-02) )
------------------------------------------------------------
Chi-Squared = 35.57512 using 59 PHA bins.
Reduced chi-squared = 0.6468204 for 55 degrees of freedom
Null hypothesis probability = 0.981
Photon flux (15-150 keV) in 29.14 sec: 10.6415 ( -0.3008 0.3054 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0205e-05 ( -3.69524e-07 3.70777e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 11.120 sec. to 12.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61351 ( -4.162037E-02 4.169643E-02) )
Norm@50keV : 0.396021 ( -9.488732E-03 9.487122E-03) )
------------------------------------------------------------
Chi-Squared = 99.61118 using 59 PHA bins.
Reduced chi-squared = 1.747565 for 57 degrees of freedom
Null hypothesis probability = 4.122E-04
Photon flux (15-150 keV) in 1.000 sec: 51.1056 ( -1.4531 1.4602 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6977e-06 ( -8.8494e-08 8.8511e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.120 sec. to 12.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.879119 ( -0.198494 0.190437 )
Epeak [keV] : 92.2482 ( -8.00365 12.1751 )
Norm@50keV : 0.807972 ( -0.133421 0.166703 )
------------------------------------------------------------
Chi-Squared = 51.66913 using 59 PHA bins.
Reduced chi-squared = 0.9226630 for 56 degrees of freedom
Null hypothesis probability = 0.639
Photon flux (15-150 keV) in 1.000 sec: 48.2820 ( -1.5539 1.5704 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.62586e-06 ( -9.1785e-08 9.1482e-08 ) ergs/cm2
Band function
Time interval is from 11.120 sec. to 12.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.879665 ( -0.189832 0.199122 )
beta : -9.12238 ( -0.877616 6.87389 )
Epeak [keV] : 92.2689 ( -8.04086 12.1299 )
Norm@50keV : 0.807432 ( -0.132908 0.167307 )
------------------------------------------------------------
Chi-Squared = 51.67010 using 59 PHA bins.
Reduced chi-squared = 0.9394563 for 55 degrees of freedom
Null hypothesis probability = 0.603
Photon flux (15-150 keV) in 1.000 sec: 48.2849 ( -1.5572 1.5673 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.62333e-06 ( -9.1824e-08 9.1265e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 09:56:22 EST 2007