batgrbproduct Analysis for Trigger=238544
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 2 11:58:17 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger238544/GCN5_download_cron
======================================================================
Trigger: 00238544 Segment: 000
BAT Trigger Time: 185082788.352 [s; MET]
Trigger Stop: 185082789.376 [s; MET]
UTC: 2006-11-13T03:53:06.784600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 298.527197826774 Dec: 35.215734899852 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.25
Image Trigger?: NO
Rate S/N Ratio: 7.48331477354788 [ if not an image trigger ]
Image S/N Ratio: 7.25
Flight Position: [ source = BAT ]
RA: 298.527197826774 Dec: 35.215734899852 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 298.495405546144 Dec: 35.2715169879109 [deg; J2000]
{ 19h 53m 58.9s , +35d 16' 17.5" }
+/- 0.656995942718769 [arcmin] (estimated 90% radius based on SNR)
+/- 0.212036397921452 [arcmin] (formal 1-sigma fit error)
SNR: 55.42977452804
RA = 19h 53m 58.9s (298.495406 deg.)
Dec = 35d 16' 17" (35.271517 deg.)
Angular difference between Flight and Ground position is 3.691741 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 564.38400003314 +/- 51.1344056438196
Measured from: -1.16800001263618
to: 563.216000020504 [s; relative to TRIGTIME]
T50: 293.016000002623 +/- 26.8693970840958
Measured from: 85.6240000128746
to: 378.640000015497 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.243999987840652
to: 1.24399998784065 [s; relative to TRIGTIME]
Total Fluence
Measured from: -22.1920000016689
to: 852.712000012398 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 9.988559 12.117864 7.529252 1.272382
0.146075 0.145576 0.124308 0.104406 [error]
Peak 0.018230 0.033056 0.027934 0.003095
0.005011 0.005166 0.004314 0.003387 [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 3.13e-06 4.89e-06 5.74e-06 1.30e-05 1.76e-05 2.68e-05 erg/cm2
Error 1.36e-07 1.18e-07 1.41e-07 7.69e-07 3.49e-07 8.16e-07 erg/cm2
Peak flux Power-law 1.99e-01 2.06e-01 1.51e-01 1.77e-01 6.24e-01 7.32e-01 ph/cm2/s
Error 6.09e-02 4.00e-02 3.38e-02 8.06e-02 1.15e-01 1.35e-01 ph/cm2/s
Fluence Cutoff-PL 2.92e-06 4.93e-06 5.84e-06 9.59e-06 1.72e-05 2.32e-05 erg/cm2
Error 1.88e-07 1.23e-07 1.59e-07 1.95e-06 4.15e-07 2.02e-06 erg/cm2
Peak flux Cutoff-PL 1.75e-01 2.20e-01 1.61e-01 9.03e-02 6.10e-01 6.47e-01 ph/cm2/s
Error 7.20e-02 4.77e-02 4.01e-02 1.08e-01 1.17e-01 1.64e-01 ph/cm2/s
Fluence Band 2.90e-06 4.91e-06 5.83e-06 9.59e-06 1.72e-05 2.53e-05 erg/cm2
Error 1.86e-07 1.23e-07 1.59e-07 1.95e-06 4.15e-07 0.00e+00 erg/cm2
Peak flux Band 1.75e-01 2.20e-01 1.61e-01 9.04e-02 6.11e-01 6.47e-01 ph/cm2/s
Error 7.20e-02 4.78e-02 4.01e-02 1.06e-01 1.17e-01 1.64e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.768 0.041 - - 2.18e-03 4.31e-05 73.185 57
CPL 1.519 0.174 107.1 61.3 2.81e-03 4.94e-04 66.761 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.450 0.304 - - 5.06e-03 9.30e-04 62.157 57
CPL 0.758 1.033 92.0 4971.7 1.12e-02 2.59e-02 61.055 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: 220.864000 sec.
T50 in the 50-300 keV band: 98.304000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 874.904 -22.192 852.712
T90 564.384 -1.168 563.216
T50 293.016 85.624 378.640
Peak 1.000 0.244 1.244
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
298.4954 +35.2715 0.0035 0.2 114.8 33.2381 55.4 TRIG_00238544
------------------------------------------
Foreground time interval of the image:
-22.192 852.712 (delta_t = 874.904 [sec])
Background time interval of the image:
-239.352 -22.192 (delta_t = 217.160 [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 -22.192 sec. to 852.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76802 ( -4.118025E-02 4.121196E-02) )
Norm@50keV : 2.177650E-03 ( -4.306412E-05 4.306599E-05) )
------------------------------------------------------------
Chi-Squared = 73.18492 using 59 PHA bins.
Reduced chi-squared = 1.283946 for 57 degrees of freedom
Null hypothesis probability = 7.305E-02
Photon flux (15-150 keV) in 874.9 sec: 0.296436 ( -0.00741 0.007462 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75634e-05 ( -3.49173e-07 3.4926e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -22.192 sec. to 852.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51862 ( -0.178959 0.168228 )
Epeak [keV] : 107.137 ( -22.9911 99.5276 )
Norm@50keV : 2.812934E-03 ( -4.359272E-04 5.518564E-04) )
------------------------------------------------------------
Chi-Squared = 66.76138 using 59 PHA bins.
Reduced chi-squared = 1.192168 for 56 degrees of freedom
Null hypothesis probability = 0.154
Photon flux (15-150 keV) in 874.9 sec: 0.288546 ( -0.008887 0.008959 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72317e-05 ( -4.1689e-07 4.12603e-07 ) ergs/cm2
Band function
Time interval is from -22.192 sec. to 852.712 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.20508 ( -0.367311 1.05314 )
beta : -1.86214 ( -7.46156 0.753298 )
Epeak [keV] : 61.6885 ( -60.5051 104.690 )
Norm@50keV : 4.289423E-03 ( -4.039633E-04 5.886119E-04) )
------------------------------------------------------------
Chi-Squared = 67.20079 using 59 PHA bins.
Reduced chi-squared = 1.221833 for 55 degrees of freedom
Null hypothesis probability = 0.125
Photon flux (15-150 keV) in 874.9 sec: 0.288539 ( -0.00889 0.008985 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72129e-05 ( -4.16102e-07 4.13653e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.244 sec. to 1.244 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45048 ( -0.302466 0.304918 )
Norm@50keV : 5.060257E-03 ( -9.336309E-04 9.266352E-04) )
------------------------------------------------------------
Chi-Squared = 62.15730 using 59 PHA bins.
Reduced chi-squared = 1.090479 for 57 degrees of freedom
Null hypothesis probability = 0.298
Photon flux (15-150 keV) in 1.000 sec: 0.623683 ( -0.114542 0.114774 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.84202e-08 ( -9.6933e-09 9.8356e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.244 sec. to 1.244 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.758371 ( -1.40864 0.658007 )
Epeak [keV] : 92.0326 ( -35.4207 9907.97 )
Norm@50keV : 1.121381E-02 ( -1.121381E-02 4.050283E-02) )
------------------------------------------------------------
Chi-Squared = 61.05460 using 59 PHA bins.
but latest trial 1.82242 gives Chi-Squared = 5.08338
Reduced chi-squared = 1.090261 for 56 degrees of freedom
Null hypothesis probability = 0.299
Photon flux (15-150 keV) in 1.000 sec: 0.610464 ( -0.116615 0.116729 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.67367e-08 ( -1.01221e-08 1.02674e-08 ) ergs/cm2
Band function
Time interval is from 0.244 sec. to 1.244 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.763736 ( -9.23626 1.20913 )
beta : -8.68996 ( -1.31004 7.47083 )
Epeak [keV] : 92.4146 ( -35.8331 9907.58 )
Norm@50keV : 1.113960E-02 ( -1.113959E-02 4.072248E-02) )
------------------------------------------------------------
Chi-Squared = 61.05463 using 59 PHA bins.
Reduced chi-squared = 1.110084 for 55 degrees of freedom
Null hypothesis probability = 0.267
Photon flux (15-150 keV) in 1.000 sec: 0.610500 ( -0.117411 0.116976 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.67131e-08 ( -1.01284e-08 1.02644e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 12:19:47 EST 2008