batgrbproduct Analysis for Trigger=180455
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 11:31:58 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger180455/GCN5_download_hand
======================================================================
Trigger: 00180455 Segment: 000
BAT Trigger Time: 160894014.272 [s; MET]
Trigger Stop: 160894014.784 [s; MET]
UTC: 2006-02-06T04:46:53.272980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 202.945915510309 Dec: 35.0746795454092 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.17
Image Trigger?: NO
Rate S/N Ratio: 21.6101827849743 [ if not an image trigger ]
Image S/N Ratio: 10.17
Flight Position: [ source = BAT ]
RA: 202.945915510309 Dec: 35.0746795454092 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 202.928675282273 Dec: 35.0499097710462 [deg; J2000]
{ 13h 31m 42.9s , +35d 02' 59.7" }
+/- 0.736870705284255 [arcmin] (estimated 90% radius based on SNR)
+/- 0.283688458657554 [arcmin] (formal 1-sigma fit error)
SNR: 47.0499745123531
RA = 13h 31m 42.9s (202.928675 deg.)
Dec = 35d 2' 60" (35.049910 deg.)
Angular difference between Flight and Ground position is 1.710452 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 7.59200000762939 +/- 1.93356045365311
Measured from: 0.151999980211258
to: 7.74399998784065 [s; relative to TRIGTIME]
T50: 2.3400000333786 +/- 0.206455777889674
Measured from: 1.60399997234344
to: 3.94400000572205 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.06799998879433
to: 3.06799998879433 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.580000013113022
to: 12.0199999809265 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.493838 0.593816 0.373267 0.077331
0.018043 0.018674 0.015910 0.012416 [error]
Peak 0.110012 0.140416 0.098393 0.020081
0.006088 0.006572 0.005505 0.003746 [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 1.45e-07 2.35e-07 2.88e-07 6.95e-07 8.65e-07 1.36e-06 erg/cm2
Error 1.06e-08 1.00e-08 1.58e-08 8.40e-08 3.74e-08 9.53e-08 erg/cm2
Peak flux Power-law 1.02e+00 9.67e-01 6.38e-01 6.53e-01 2.89e+00 3.28e+00 ph/cm2/s
Error 9.53e-02 5.63e-02 4.46e-02 9.20e-02 1.63e-01 1.79e-01 ph/cm2/s
Fluence Cutoff-PL 1.30e-07 2.45e-07 2.96e-07 3.39e-07 8.31e-07 1.01e-06 erg/cm2
Error 1.31e-08 1.18e-08 1.75e-08 1.35e-07 4.24e-08 1.41e-07 erg/cm2
Peak flux Cutoff-PL 8.69e-01 1.04e+00 6.85e-01 2.92e-01 2.79e+00 2.89e+00 ph/cm2/s
Error 1.16e-01 6.83e-02 5.31e-02 1.08e-01 1.70e-01 2.03e-01 ph/cm2/s
Fluence Band 1.29e-07 2.44e-07 2.96e-07 3.40e-07 8.30e-07 1.02e-06 erg/cm2
Error 1.30e-08 1.18e-08 1.75e-08 1.35e-07 4.23e-08 1.82e-07 erg/cm2
Peak flux Band 8.69e-01 1.04e+00 6.85e-01 2.93e-01 2.79e+00 2.89e+00 ph/cm2/s
Error 1.16e-01 6.83e-02 5.31e-02 1.08e-01 1.70e-01 2.03e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.705 0.076 - - 7.42e-03 3.07e-04 64.560 57
CPL 1.165 0.325 78.1 25.6 1.37e-02 5.12e-03 55.326 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.601 0.094 - - 2.25e-02 1.26e-03 71.170 57
CPL 0.746 0.427 74.0 17.0 6.03e-02 3.07e-02 56.832 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: 20.224000 sec.
T50 in the 50-300 keV band: 2.368000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 12.600 -0.580 12.020
T90 7.592 0.152 7.744
T50 2.340 1.604 3.944
Peak 1.000 2.068 3.068
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
202.9287 +35.0499 0.0041 10.6 135.3 1.5415 47.0 TRIG_00180455
------------------------------------------
Foreground time interval of the image:
-0.580 10.429 (delta_t = 11.009 [sec])
Background time interval of the image:
-299.272 -0.580 (delta_t = 298.692 [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 -0.580 sec. to 12.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70545 ( -7.591105E-02 7.641029E-02) )
Norm@50keV : 7.418855E-03 ( -3.069900E-04 3.061076E-04) )
------------------------------------------------------------
Chi-Squared = 64.56036 using 59 PHA bins.
Reduced chi-squared = 1.132638 for 57 degrees of freedom
Null hypothesis probability = 0.229
Photon flux (15-150 keV) in 12.60 sec: 0.987191 ( -0.042431 0.042569 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.65074e-07 ( -3.72154e-08 3.749e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.580 sec. to 12.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16545 ( -0.338038 0.311949 )
Epeak [keV] : 78.1328 ( -13.1967 38.1004 )
Norm@50keV : 1.369943E-02 ( -3.996817E-03 6.235543E-03) )
------------------------------------------------------------
Chi-Squared = 55.32589 using 59 PHA bins.
Reduced chi-squared = 0.9879622 for 56 degrees of freedom
Null hypothesis probability = 0.500
Photon flux (15-150 keV) in 12.60 sec: 0.952719 ( -0.046347 0.046525 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.30607e-07 ( -4.2215e-08 4.2583e-08 ) ergs/cm2
Band function
Time interval is from -0.580 sec. to 12.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16545 ( -0.311940 0.338080 )
beta : -8.90954 ( -1.09046 7.02734 )
Epeak [keV] : 78.1306 ( -13.2063 38.0973 )
Norm@50keV : 1.369705E-02 ( -3.995983E-03 6.238885E-03) )
------------------------------------------------------------
Chi-Squared = 55.32605 using 59 PHA bins.
Reduced chi-squared = 1.005928 for 55 degrees of freedom
Null hypothesis probability = 0.462
Photon flux (15-150 keV) in 12.60 sec: 0.952741 ( -0.046447 0.046485 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.30056e-07 ( -4.237e-08 4.22579e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.068 sec. to 3.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60116 ( -9.322286E-02 9.399402E-02) )
Norm@50keV : 2.249897E-02 ( -1.264013E-03 1.260316E-03) )
------------------------------------------------------------
Chi-Squared = 71.17030 using 59 PHA bins.
Reduced chi-squared = 1.248602 for 57 degrees of freedom
Null hypothesis probability = 9.816E-02
Photon flux (15-150 keV) in 1.000 sec: 2.89227 ( -0.16305 0.16328 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10381e-07 ( -1.2569e-08 1.2633e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.068 sec. to 3.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.746382 ( -0.448215 0.406588 )
Epeak [keV] : 73.9800 ( -10.7436 23.2086 )
Norm@50keV : 6.032988E-02 ( -2.212846E-02 3.927565E-02) )
------------------------------------------------------------
Chi-Squared = 56.83214 using 59 PHA bins.
Reduced chi-squared = 1.014860 for 56 degrees of freedom
Null hypothesis probability = 0.444
Photon flux (15-150 keV) in 1.000 sec: 2.79000 ( -0.17007 0.17012 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00323e-07 ( -1.3515e-08 1.3585e-08 ) ergs/cm2
Band function
Time interval is from 2.068 sec. to 3.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.749336 ( -0.403628 0.444096 )
beta : -8.98083 ( -1.01917 6.94902 )
Epeak [keV] : 74.0700 ( -10.8411 23.0950 )
Norm@50keV : 6.011207E-02 ( -2.192198E-02 3.951473E-02) )
------------------------------------------------------------
Chi-Squared = 56.83254 using 59 PHA bins.
Reduced chi-squared = 1.033319 for 55 degrees of freedom
Null hypothesis probability = 0.407
Photon flux (15-150 keV) in 1.000 sec: 2.79027 ( -0.17032 0.16996 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00142e-07 ( -1.3495e-08 1.3591e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 11:39:13 EST 2007