batgrbproduct Analysis for Trigger=340895
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 v2.42
Process Start Time (local time): Fri Jan 23 12:19:28 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger340895/GCN5_download_cron
======================================================================
Trigger: 00340895 Segment: 000
BAT Trigger Time: 254389920.768 [s; MET]
Trigger Stop: 254389921.792 [s; MET]
UTC: 2009-01-23T07:51:56.329040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 6.77522560443211 Dec: -23.5140158661529 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.15
Image Trigger?: NO
Rate S/N Ratio: 7.93725393319377 [ if not an image trigger ]
Image S/N Ratio: 7.15
Flight Position: [ source = BAT ]
RA: 6.77522560443211 Dec: -23.5140158661529 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 6.79364992156489 Dec: -23.5034965453978 [deg; J2000]
{ 00h 27m 10.5s , -23d 30' 12.6" }
+/- 1.52378293645121 [arcmin] (estimated 90% radius based on SNR)
+/- 0.592057637234289 [arcmin] (formal 1-sigma fit error)
SNR: 16.6647827809958
Angular difference between Flight and Ground position is 1.194136 arcmin
Partial Coding Fraction: 0.3632812 [ including projection effects ]
Duration
T90: 131.364000022411 +/- 22.9411767050796
Measured from: -37.9799999296665
to: 93.3840000927448 [s; relative to TRIGTIME]
T50: 38.0760000050068 +/- 12.8119514562773
Measured from: -14.8759999275208
to: 23.200000077486 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0839999914169312
to: 1.08399999141693 [s; relative to TRIGTIME]
Total Fluence
Measured from: -49.6280000209808
to: 117.907999992371 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.408756 1.635366 1.114620 0.194372
0.096080 0.096624 0.085702 0.074517 [error]
Peak 0.050882 0.072477 0.050124 0.006927
0.010261 0.010373 0.009565 0.007666 [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 4.94e-07 7.85e-07 9.39e-07 2.19e-06 2.85e-06 4.42e-06 erg/cm2
Error 5.68e-08 5.40e-08 8.74e-08 4.38e-07 2.06e-07 5.05e-07 erg/cm2
Peak flux Power-law 6.44e-01 5.71e-01 3.47e-01 3.20e-01 1.70e+00 1.88e+00 ph/cm2/s
Error 1.68e-01 9.73e-02 7.80e-02 1.40e-01 2.87e-01 3.14e-01 ph/cm2/s
Fluence Cutoff-PL 4.93e-07 7.85e-07 9.40e-07 2.18e-06 2.85e-06 4.36e-06 erg/cm2
Error 6.01e-08 5.49e-08 8.75e-08 7.28e-07 1.97e-07 6.30e-07 erg/cm2
Peak flux Cutoff-PL 5.73e-01 6.22e-01 3.66e-01 1.39e-01 1.66e+00 1.70e+00 ph/cm2/s
Error 1.94e-01 1.24e-01 9.07e-02 2.10e-01 2.20e-01 3.56e-01 ph/cm2/s
Fluence Band 4.83e-07 7.88e-07 9.39e-07 2.14e-06 2.84e-06 4.33e-06 erg/cm2
Error 3.83e-08 6.54e-08 8.35e-08 4.32e-07 2.08e-07 3.82e-07 erg/cm2
Peak flux Band 5.73e-01 6.23e-01 3.66e-01 1.38e-01 1.66e+00 1.70e+00 ph/cm2/s
Error 1.94e-01 1.25e-01 9.06e-02 2.10e-01 2.94e-01 3.56e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.740 0.123 - - 1.84e-03 1.28e-04 41.056 57
CPL 1.679 0.000 259.8 0.0 1.98e-03 1.03e-03 41.223 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.716 0.280 - - 1.27e-02 2.27e-03 56.727 57
CPL 0.912 1.313 64.2 4985.2 3.39e-02 1.03e-01 55.246 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: 105.408000 sec.
T50 in the 50-300 keV band: 29.952000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 167.536 -49.628 117.908
T90 131.364 -37.980 93.384
T50 38.076 -14.876 23.200
Peak 1.000 0.084 1.084
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
6.7936 -23.5035 0.0115 45.8 -158.2 3.1464 16.7 TRIG_00340895
------------------------------------------
Foreground time interval of the image:
-49.628 11.033 (delta_t = 60.661 [sec])
Background time interval of the image:
-116.267 -81.398 (delta_t = 34.869 [sec])
-80.768 -49.628 (delta_t = 31.140 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -49.628 sec. to 117.908 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74022 ( -0.122252 0.124369 )
Norm@50keV : 1.843915E-03 ( -1.285243E-04 1.273877E-04) )
------------------------------------------------------------
Chi-Squared = 41.05619 using 59 PHA bins.
Reduced chi-squared = 0.7202840 for 57 degrees of freedom
Null hypothesis probability = 0.945
Photon flux (15-150 keV) in 167.5 sec: 0.248439 ( -0.017337 0.017408 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.85179e-06 ( -2.05439e-07 2.05958e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -49.628 sec. to 117.908 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67868 ( )
Epeak [keV] : 259.797 ( )
Norm@50keV : 1.981897E-03 ( -5.043451E-04 1.555491E-03) )
------------------------------------------------------------
Chi-Squared = 41.22345 using 59 PHA bins.
but latest trial 6.554784E-04 gives Chi-Squared = 3.08294
Reduced chi-squared = 0.7361330 for 56 degrees of freedom
Null hypothesis probability = 0.930
Photon flux (15-150 keV) in 167.5 sec: 0.248332 ( -0.017329 0.017401 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.85191e-06 ( -2.05204e-07 1.88052e-07 ) ergs/cm2
Band function
Time interval is from -49.628 sec. to 117.908 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49386 ( -8.50614 6.49386 )
beta : -1.74021 ( -0.124477 0.122226 )
Epeak [keV] : 14.3492 ( -14.2492 985.324 )
Norm@50keV : 3.831077E-03 ( -3.831077E-03 255.492 )
------------------------------------------------------------
Chi-Squared = 41.05618 using 59 PHA bins.
Reduced chi-squared = 0.7464761 for 55 degrees of freedom
Null hypothesis probability = 0.919
Photon flux (15-150 keV) in 167.5 sec: 0.248169 ( -0.016916 0.017613 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.84281e-06 ( -2.03931e-07 2.1249e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.084 sec. to 1.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71639 ( -0.273033 0.286733 )
Norm@50keV : 1.271746E-02 ( -2.285127E-03 2.246286E-03) )
------------------------------------------------------------
Chi-Squared = 56.72710 using 59 PHA bins.
Reduced chi-squared = 0.9952122 for 57 degrees of freedom
Null hypothesis probability = 0.485
Photon flux (15-150 keV) in 1.000 sec: 1.69880 ( -0.28703 0.28764 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17643e-07 ( -2.17322e-08 2.199e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.084 sec. to 1.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.912481 ( -1.46955 1.15746 )
Epeak [keV] : 64.1944 ( -34.5133 9935.81 )
Norm@50keV : 3.392347E-02 ( -3.392347E-02 0.171798 )
------------------------------------------------------------
Chi-Squared = 55.24627 using 59 PHA bins.
Reduced chi-squared = 0.9865405 for 56 degrees of freedom
Null hypothesis probability = 0.503
Photon flux (15-150 keV) in 1.000 sec: 1.65560 ( -0.29349 0.1475 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11564e-07 ( -2.31565e-08 2.3876e-08 ) ergs/cm2
Band function
Time interval is from 0.084 sec. to 1.084 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.909130 ( -9.09087 1.31218 )
beta : -9.28465 ( -7.99159 0.454699 )
Epeak [keV] : 64.0772 ( -40.7895 394.883 )
Norm@50keV : 3.407380E-02 ( -109.034 199.824 )
------------------------------------------------------------
Chi-Squared = 55.24622 using 59 PHA bins.
Reduced chi-squared = 1.004477 for 55 degrees of freedom
Null hypothesis probability = 0.465
Photon flux (15-150 keV) in 1.000 sec: 1.65525 ( -0.29312 0.29417 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13706e-07 ( -2.40764e-08 2.3819e-08 ) ergs/cm2
Plot creation:
Fri Jan 23 12:53:13 EST 2009