batgrbproduct Analysis for Trigger=180884
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 11:39:55 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger180884/GCN5_download_cron
======================================================================
Trigger: 00180884 Segment: 000
BAT Trigger Time: 161173856 [s; MET]
Trigger Stop: 161174352 [s; MET]
UTC: 2006-02-09T10:30:54.994680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 283.380742092367 Dec: -0.860291301834337 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.51
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.51
Flight Position: [ source = BAT ]
RA: 283.380742092367 Dec: -0.860291301834337 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 283.414758413888 Dec: -0.664871086121143 [deg; J2000]
{ 18h 53m 39.5s , -00d 39' 53.5" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 93.0683679319384 [arcmin] (formal 1-sigma fit error)
SNR: -0.132757687067525
RA = 18h 53m 39.5s (283.414758 deg.)
Dec = 0d 39' 54" (-0.664871 deg.)
Angular difference between Flight and Ground position is 11.901490 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 496 +/-
Measured from: 0
to: 496 [s; relative to TRIGTIME]
T50: 496 +/-
Measured from: 0
to: 496 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 496 second)
Measured from: 0
to: 496 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 496 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.046042 -0.033392 -0.012160 0.000253
0.036516 0.036256 0.036637 0.039452 [error]
Peak 0.046042 -0.033392 -0.012160 0.000253
0.036516 0.036256 0.036637 0.039452 [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 8.56e-09 9.33e-10 3.90e-11 1.69e-12 9.81e-09 0.00e+00 erg/cm2
Error 1.14e-08 6.51e-09 6.07e-09 2.58e-07 1.93e-08 0.00e+00 erg/cm2
Peak flux Power-law 9.90e-03 7.12e-04 1.85e-05 4.89e-07 1.00e-02 0.00e+00 ph/cm2/s
Error 1.18e-02 3.66e-03 1.61e-03 2.38e-02 1.49e-02 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 3.69e-11 2.95e-19 3.19e-22 4.49e-34 1.23e-08 0.00e+00 erg/cm2
Error 1.25e-08 6.29e-33 1.60e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 9.66e-03 6.19e-04 1.39e-05 3.18e-07 1.01e-02 0.00e+00 ph/cm2/s
Error 1.23e-02 3.66e-03 1.61e-03 2.80e-02 1.49e-02 0.00e+00 ph/cm2/s
Fluence Band 8.65e-09 9.03e-10 3.81e-11 1.67e-12 9.64e-09 0.00e+00 erg/cm2
Error 1.17e-08 6.48e-09 6.06e-09 1.27e-06 1.93e-08 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 7.81e-04 7.58e-06 6.87e-08 1.15e-02 0.00e+00 ph/cm2/s
Error 2.06e-03 1.42e-03 4.67e-05 1.51e-02 1.31e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 6.500 - - 0.00e+00 9.27e-05 74.678 57
CPL 1.000 6.500 50.0 5000.0 0.00e+00 0.00e+00 74.678 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 6.500 - - 0.00e+00 9.27e-05 74.678 57
CPL 1.000 6.500 50.0 5000.0 0.00e+00 0.00e+00 74.678 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 496.000 0.000 496.000
T90 496.000 0.000 496.000
T50 496.000 0.000 496.000
Peak 496.000 0.000 496.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
283.4148 -0.6649 1.4505 13.1 -145.6 -0.0106 -0.1 TRIG_00180884
------------------------------------------
Foreground time interval of the image:
0.000 33.091 (delta_t = 33.091 [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 33.091 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -4.50000 8.50000 )
Norm@50keV : 0.00000 ( 0.00000 1.853700E-04) )
------------------------------------------------------------
Chi-Squared = 74.67834 using 59 PHA bins.
Reduced chi-squared = 1.310146 for 57 degrees of freedom
Null hypothesis probability = 5.808E-02
Photon flux (15-150 keV) in 33.09 sec: 1.000382E-02 ( -0.0100038 0.0197443 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.80973e-09 ( -9.80973e-09 2.88804e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.091 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( -4.00000 9.00000 )
Epeak [keV] : 50.0000 ( -49.9900 9950.00 )
Norm@50keV : 0.00000 ( )
------------------------------------------------------------
Chi-Squared = 74.67834 using 59 PHA bins.
Reduced chi-squared = 1.333542 for 56 degrees of freedom
Null hypothesis probability = 4.833E-02
Photon flux (15-150 keV) in 33.09 sec: 1.011518E-02 ( -0.0101152 0.0196129 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22618e-08 ( -1.22618e-08 1.982e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.091 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.983950 ( -9.01605 5.98395 )
beta : -2.50000 ( -7.50000 12.5000 )
Epeak [keV] : 80.0000 ( -79.9000 9920.00 )
Norm@50keV : 0.00000 ( -3.289985E-02 4.835007E+06) )
------------------------------------------------------------
Chi-Squared = 74.67834 using 59 PHA bins.
Reduced chi-squared = 1.357788 for 55 degrees of freedom
Null hypothesis probability = 3.989E-02
Photon flux (15-150 keV) in 33.09 sec: 1.145155E-02 ( -0.0114515 0.0187602 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.64405e-09 ( -9.64405e-09 2.89521e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.091 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -4.50000 8.50000 )
Norm@50keV : 0.00000 ( 0.00000 1.853700E-04) )
------------------------------------------------------------
Chi-Squared = 74.67834 using 59 PHA bins.
Reduced chi-squared = 1.310146 for 57 degrees of freedom
Null hypothesis probability = 5.808E-02
Photon flux (15-150 keV) in 33.09 sec: 1.000382E-02 ( -0.0100038 0.0197443 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.80973e-09 ( -9.80973e-09 2.88804e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.091 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( -4.00000 9.00000 )
Epeak [keV] : 50.0000 ( -49.9900 9950.00 )
Norm@50keV : 0.00000 ( )
------------------------------------------------------------
Chi-Squared = 74.67834 using 59 PHA bins.
Reduced chi-squared = 1.333542 for 56 degrees of freedom
Null hypothesis probability = 4.833E-02
Photon flux (15-150 keV) in 33.09 sec: 1.011518E-02 ( -0.0101152 0.0196129 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22618e-08 ( -1.22618e-08 1.982e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.091 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.983950 ( -9.01605 5.98395 )
beta : -2.50000 ( -7.50000 12.5000 )
Epeak [keV] : 80.0000 ( -79.9000 9920.00 )
Norm@50keV : 0.00000 ( -3.289985E-02 4.835007E+06) )
------------------------------------------------------------
Chi-Squared = 74.67834 using 59 PHA bins.
Reduced chi-squared = 1.357788 for 55 degrees of freedom
Null hypothesis probability = 3.989E-02
Photon flux (15-150 keV) in 33.09 sec: 1.145155E-02 ( -0.0114515 0.0187602 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.64405e-09 ( -9.64405e-09 2.89521e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 11:44:29 EST 2007