batgrbproduct Analysis for Trigger=180984
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 12:07:54 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger180984/GCN5_download_cron
======================================================================
Trigger: 00180984 Segment: 000
BAT Trigger Time: 161248584 [s; MET]
Trigger Stop: 161248648 [s; MET]
UTC: 2006-02-10T07:16:22.992980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 255.199229262299 Dec: -41.6579111783845 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 11.64
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.64
Flight Position: [ source = BAT ]
RA: 255.199229262299 Dec: -41.6579111783845 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 255.205638674412 Dec: -41.6784244920198 [deg; J2000]
{ 17h 00m 49.4s , -41d 40' 42.3" }
+/- 2.85770466847769 [arcmin] (estimated 90% radius based on SNR)
+/- 1.07402386647102 [arcmin] (formal 1-sigma fit error)
SNR: 6.78679968456245
RA = 17h 0m 49.4s (255.205639 deg.)
Dec = -41d 40' 42" (-41.678424 deg.)
Angular difference between Flight and Ground position is 1.263879 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.294561 0.258586 0.045807 -0.062568
0.044896 0.039853 0.037286 0.037697 [error]
Peak 0.294561 0.258586 0.045807 -0.062568
0.044896 0.039853 0.037286 0.037697 [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 1.01e-07 9.10e-08 5.64e-08 5.32e-08 2.71e-07 3.03e-07 erg/cm2
Error 2.09e-08 2.02e-08 2.57e-08 4.58e-08 6.20e-08 8.74e-08 erg/cm2
Peak flux Power-law 1.01e-01 5.09e-02 1.58e-02 6.24e-03 1.71e-01 1.74e-01 ph/cm2/s
Error 2.14e-02 1.08e-02 6.96e-03 6.30e-03 3.01e-02 3.09e-02 ph/cm2/s
Fluence Cutoff-PL 9.83e-08 1.04e-07 2.61e-08 8.62e-10 2.29e-07 2.29e-07 erg/cm2
Error 2.30e-08 2.62e-08 3.27e-08 3.54e-08 6.11e-08 5.17e-08 erg/cm2
Peak flux Cutoff-PL 9.65e-02 5.89e-02 8.01e-03 1.43e-04 1.64e-01 1.64e-01 ph/cm2/s
Error 2.38e-02 1.45e-02 9.82e-03 2.11e-03 3.01e-02 3.06e-02 ph/cm2/s
Fluence Band 1.01e-07 9.05e-08 5.53e-08 5.10e-08 2.70e-07 2.97e-07 erg/cm2
Error 2.16e-08 2.00e-08 1.58e-08 2.82e-08 5.89e-08 0.00e+00 erg/cm2
Peak flux Band 9.70e-02 5.83e-02 9.28e-03 2.74e-04 1.65e-01 1.65e-01 ph/cm2/s
Error 1.73e-02 1.13e-02 2.78e-03 4.15e-03 2.90e-02 2.88e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.690 0.425 - - 7.73e-04 2.61e-04 70.885 57
CPL 0.594 2.497 20.6 14.5 2.09e-02 1.87e+00 68.555 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.690 0.425 - - 7.73e-04 2.61e-04 70.885 57
CPL 0.594 2.500 20.6 14.5 2.09e-02 1.87e+00 68.555 0
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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
255.2056 -41.6784 0.0285 5.7 -73.0 0.5614 6.8 TRIG_00180984
------------------------------------------
Foreground time interval of the image:
0.000 33.067 (delta_t = 33.067 [sec])
Background time interval of the image:
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 0.000 sec. to 33.067 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.68983 ( -0.393571 0.455926 )
Norm@50keV : 7.729211E-04 ( -2.549603E-04 2.661181E-04) )
------------------------------------------------------------
Chi-Squared = 70.88522 using 59 PHA bins.
Reduced chi-squared = 1.243600 for 57 degrees of freedom
Null hypothesis probability = 0.102
Photon flux (15-150 keV) in 33.07 sec: 0.171411 ( -0.030093 0.030113 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71039e-07 ( -5.94843e-08 6.44627e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.067 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.593523 ( -3.59352 1.40053 )
Epeak [keV] : 20.5996 ( -20.5896 8.41108 )
Norm@50keV : 2.091265E-02 ( -1.932689E-02 3.72902 )
------------------------------------------------------------
Chi-Squared = 68.55479 using 59 PHA bins.
but latest trial 1.99406 gives Chi-Squared = 10.9612
but latest trial 1.204373E-03 gives Chi-Squared = 7.21826
Reduced chi-squared = 1.224193 for 56 degrees of freedom
Null hypothesis probability = 0.121
Photon flux (15-150 keV) in 33.07 sec: 0.163554 ( -0.029618 0.030675 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29251e-07 ( -5.02145e-08 7.20473e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.067 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39739 ( -8.60261 6.39739 )
beta : -9.36165 ( -0.638346 19.3616 )
Epeak [keV] : 15.6151 ( -15.5151 13.8241 )
Norm@50keV : 5.460442E-03 ( -0.101256 112.383 )
------------------------------------------------------------
Chi-Squared = 68.92714 using 59 PHA bins.
Reduced chi-squared = 1.253221 for 55 degrees of freedom
Null hypothesis probability = 9.813E-02
Photon flux (15-150 keV) in 33.07 sec: 0.164890 ( -0.028475 0.029579 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69732e-07 ( -5.39124e-08 6.39309e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.067 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.68983 ( -0.393571 0.455926 )
Norm@50keV : 7.729211E-04 ( -2.549603E-04 2.661181E-04) )
------------------------------------------------------------
Chi-Squared = 70.88522 using 59 PHA bins.
Reduced chi-squared = 1.243600 for 57 degrees of freedom
Null hypothesis probability = 0.102
Photon flux (15-150 keV) in 33.07 sec: 0.171411 ( -0.030093 0.030113 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71039e-07 ( -5.94843e-08 6.44627e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.067 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.593523 ( -3.59352 1.40654 )
Epeak [keV] : 20.5996 ( -20.5896 8.41108 )
Norm@50keV : 2.091265E-02 ( -1.932689E-02 3.72902 )
------------------------------------------------------------
Chi-Squared = 68.55479 using 59 PHA bins.
but latest trial 2.00755 gives Chi-Squared = 10.9429
but latest trial 1.204373E-03 gives Chi-Squared = 7.21826
Reduced chi-squared = 1.224193 for 56 degrees of freedom
Null hypothesis probability = 0.121
Photon flux (15-150 keV) in 33.07 sec: 0.163554 ( -0.029618 0.030675 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29251e-07 ( -5.02145e-08 7.20473e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.067 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39739 ( -8.60261 6.39739 )
beta : -9.36165 ( -0.638346 19.3616 )
Epeak [keV] : 15.6151 ( -15.5151 13.8241 )
Norm@50keV : 5.460442E-03 ( -0.101256 112.383 )
------------------------------------------------------------
Chi-Squared = 68.92714 using 59 PHA bins.
Reduced chi-squared = 1.253221 for 55 degrees of freedom
Null hypothesis probability = 9.813E-02
Photon flux (15-150 keV) in 33.07 sec: 0.164890 ( -0.028475 0.029579 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69732e-07 ( -5.39124e-08 6.39309e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 12:13:21 EST 2007