batgrbproduct Analysis for Trigger=173904
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): Wed Jan 9 20:41:14 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger173904/SDC
======================================================================
Trigger: 00173904 Segment: 000
BAT Trigger Time: 156888200 [s; MET]
Trigger Stop: 156888392 [s; MET]
UTC: 2005-12-21T20:03:20.090560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 312.395437708596 Dec: 53.0538094719893 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.45
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.45
Flight Position: [ source = BAT ]
RA: 312.395437708596 Dec: 53.0538094719893 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 312.380326665288 Dec: 53.0418646116086 [deg; J2000]
{ 20h 49m 31.3s , +53d 02' 30.7" }
+/- 1.67783003814164 [arcmin] (estimated 90% radius based on SNR)
+/- 0.738473193993552 [arcmin] (formal 1-sigma fit error)
SNR: 14.5227833336674
RA = 20h 49m 31.3s (312.380327 deg.)
Dec = 53d 2' 31" (53.041865 deg.)
Angular difference between Flight and Ground position is 0.900396 arcmin
Partial Coding Fraction: 0.4492188 [ including projection effects ]
Duration
T90: 39.9320000112057 +/- 5.52369188347121
Measured from: 51.5679999887943
to: 91.5 [s; relative to TRIGTIME]
T50: 21.727999985218 +/- 4.73837272490322
Measured from: 60.4160000085831
to: 82.1439999938011 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 58.891999989748
to: 59.891999989748 [s; relative to TRIGTIME]
Total Fluence
Measured from: 49.9040000140667
to: 93.555999994278 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.295262 0.489244 0.426217 0.093881
0.048998 0.049860 0.043206 0.035375 [error]
Peak 0.015423 0.015547 0.032132 0.011243
0.007643 0.007873 0.006945 0.005744 [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 1.03e-07 2.09e-07 3.29e-07 1.15e-06 9.17e-07 1.80e-06 erg/cm2
Error 2.16e-08 2.61e-08 4.11e-08 3.23e-07 1.03e-07 3.46e-07 erg/cm2
Peak flux Power-law 9.20e-02 1.48e-01 1.79e-01 4.27e-01 5.41e-01 8.46e-01 ph/cm2/s
Error 8.52e-02 1.15e-01 5.29e-02 3.39e-01 1.95e-01 2.92e-01 ph/cm2/s
Fluence Cutoff-PL 9.87e-08 2.13e-07 3.38e-07 8.62e-07 9.09e-07 1.44e-06 erg/cm2
Error 2.62e-08 2.96e-08 3.70e-08 5.65e-07 1.07e-07 5.77e-07 erg/cm2
Peak flux Cutoff-PL 9.17e-02 1.48e-01 1.80e-01 4.25e-01 5.41e-01 8.44e-01 ph/cm2/s
Error 8.51e-02 1.15e-01 5.30e-02 3.38e-01 1.95e-01 2.90e-01 ph/cm2/s
Fluence Band 9.36e-08 2.15e-07 3.38e-07 9.55e-07 9.05e-07 1.34e-06 erg/cm2
Error 2.58e-08 3.10e-08 4.88e-08 7.15e-07 1.06e-07 4.44e-07 erg/cm2
Peak flux Band 9.17e-02 1.48e-01 1.80e-01 4.25e-01 5.41e-01 8.13e-01 ph/cm2/s
Error 8.51e-02 1.15e-01 5.30e-02 4.34e-01 1.95e-01 5.85e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.344 0.189 - - 2.15e-03 2.29e-04 56.280 57
CPL 1.046 0.633 177.5 5000.0 2.94e-03 2.37e-03 56.064 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.721 0.735 - - 4.69e-03 1.93e-03 63.297 57
CPL 0.713 0.742 9984.9 5000.0 4.73e-03 1.93e-03 63.311 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: 43.264000 sec.
T50 in the 50-300 keV band: 27.712000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 43.652 49.904 93.556
T90 39.932 51.568 91.500
T50 21.728 60.416 82.144
Peak 1.000 58.892 59.892
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
312.3803 +53.0419 0.0132 38.3 17.4 1.3894 14.5 TRIG_00173904
------------------------------------------
Foreground time interval of the image:
49.904 93.556 (delta_t = 43.652 [sec])
Background time interval of the image:
-299.000 49.904 (delta_t = 348.904 [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 49.904 sec. to 93.556 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34358 ( -0.190157 0.187046 )
Norm@50keV : 2.147180E-03 ( -2.287328E-04 2.286243E-04) )
------------------------------------------------------------
Chi-Squared = 56.28003 using 59 PHA bins.
Reduced chi-squared = 0.9873689 for 57 degrees of freedom
Null hypothesis probability = 0.502
Photon flux (15-150 keV) in 43.65 sec: 0.258334 ( -0.029565 0.029695 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.16737e-07 ( -1.03276e-07 1.03573e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 49.904 sec. to 93.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04588 ( -0.791292 0.474783 )
Epeak [keV] : 177.482 ( -177.472 9822.52 )
Norm@50keV : 2.942230E-03 ( -1.006929E-03 3.728410E-03) )
------------------------------------------------------------
Chi-Squared = 56.06447 using 59 PHA bins.
Reduced chi-squared = 1.001151 for 56 degrees of freedom
Null hypothesis probability = 0.472
Photon flux (15-150 keV) in 43.65 sec: 0.256047 ( -0.030567 0.03045 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.09408e-07 ( -1.07789e-07 1.05563e-07 ) ergs/cm2
Band function
Time interval is from 49.904 sec. to 93.556 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.866754 ( -9.13325 4.84691 )
beta : -1.41050 ( -8.16405 0.673665 )
Epeak [keV] : 92.5880 ( -174.296 9825.60 )
Norm@50keV : 4.048500E-03 ( -1.013169E-03 2.249569E-03) )
------------------------------------------------------------
Chi-Squared = 56.22887 using 59 PHA bins.
Reduced chi-squared = 1.022343 for 55 degrees of freedom
Null hypothesis probability = 0.429
Photon flux (15-150 keV) in 43.65 sec: 0.255354 ( -0.030287 0.030749 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.05423e-07 ( -1.04083e-07 1.07711e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 58.892 sec. to 59.892 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.720638 ( -0.852051 0.618724 )
Norm@50keV : 4.691181E-03 ( -2.112121E-03 1.738831E-03) )
------------------------------------------------------------
Chi-Squared = 63.29660 using 59 PHA bins.
Reduced chi-squared = 1.110467 for 57 degrees of freedom
Null hypothesis probability = 0.264
Photon flux (15-150 keV) in 1.000 sec: 0.541391 ( -0.190795 0.199614 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67345e-08 ( -1.67303e-08 1.67154e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 58.892 sec. to 59.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.712628 ( -0.860319 0.623801 )
Epeak [keV] : 9984.91 ( -9984.90 15.0859 )
Norm@50keV : 4.727087E-03 ( -2.116641E-03 1.742119E-03) )
------------------------------------------------------------
Chi-Squared = 63.31055 using 59 PHA bins.
Reduced chi-squared = 1.130546 for 56 degrees of freedom
Null hypothesis probability = 0.234
Photon flux (15-150 keV) in 1.000 sec: 0.541157 ( -0.19067 0.199539 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67793e-08 ( -1.67526e-08 1.67172e-08 ) ergs/cm2
Band function
Time interval is from 58.892 sec. to 59.892 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.827062 ( -9.17294 5.82706 )
beta : -0.736947 ( -0.602648 0.868828 )
Epeak [keV] : 12.3254 ( -12.2254 9987.67 )
Norm@50keV : 7.504735E-03 ( -7.504735E-03 108834. )
------------------------------------------------------------
Chi-Squared = 63.29873 using 59 PHA bins.
Reduced chi-squared = 1.150886 for 55 degrees of freedom
Null hypothesis probability = 0.207
Photon flux (15-150 keV) in 1.000 sec: 0.541149 ( -0.190679 0.199546 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67376e-08 ( -1.67402e-08 1.67083e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 20:55:07 EST 2008