batgrbproduct Analysis for Trigger=145675
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 Jan 7 13:15:48 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger145675/SDC
======================================================================
Trigger: 00145675 Segment: 000
BAT Trigger Time: 142921742.016 [s; MET]
Trigger Stop: 142921742.528 [s; MET]
UTC: 2005-07-13T04:29:02.396820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 320.536539185524 Dec: 77.0721719432608 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.32
Image Trigger?: NO
Rate S/N Ratio: 31.2729915422238 [ if not an image trigger ]
Image S/N Ratio: 11.32
Flight Position: [ source = BAT ]
RA: 320.536539185524 Dec: 77.0721719432608 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 320.573358178001 Dec: 77.0717721918336 [deg; J2000]
{ 21h 22m 17.6s , +77d 04' 18.4" }
+/- 1.06217506423059 [arcmin] (estimated 90% radius based on SNR)
+/- 0.389735418817802 [arcmin] (formal 1-sigma fit error)
SNR: 27.9058578495964
RA = 21h 22m 17.6s (320.573358 deg.)
Dec = 77d 4' 18" (77.071772 deg.)
Angular difference between Flight and Ground position is 0.494826 arcmin
Partial Coding Fraction: 0.3046875 [ including projection effects ]
Duration
T90: 124.655999958515 +/- 62.2008643083915
Measured from: -52.5839999914169
to: 72.0719999670982 [s; relative to TRIGTIME]
T50: 10.527999997139 +/- 1.39778107404888
Measured from: 2.90399998426437
to: 13.4319999814034 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.972000002861023
to: 1.97200000286102 [s; relative to TRIGTIME]
Total Fluence
Measured from: -70.5200000107288
to: 121.592000007629 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.281927 2.898965 2.347320 0.636014
0.093844 0.097314 0.086530 0.075588 [error]
Peak 0.121688 0.207917 0.171393 0.076686
0.011360 0.012618 0.011651 0.009656 [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 7.34e-07 1.31e-06 1.78e-06 5.03e-06 5.15e-06 8.86e-06 erg/cm2
Error 5.74e-08 5.82e-08 8.89e-08 5.77e-07 2.14e-07 6.24e-07 erg/cm2
Peak flux Power-law 1.28e+00 1.48e+00 1.24e+00 1.76e+00 4.64e+00 5.76e+00 ph/cm2/s
Error 1.70e-01 1.18e-01 9.58e-02 2.95e-01 3.22e-01 3.96e-01 ph/cm2/s
Fluence Cutoff-PL 7.09e-07 1.32e-06 1.81e-06 4.09e-06 5.11e-06 7.90e-06 erg/cm2
Error 7.33e-08 6.37e-08 9.90e-08 1.35e-06 2.31e-07 1.38e-06 erg/cm2
Peak flux Cutoff-PL 1.27e+00 1.49e+00 1.24e+00 1.75e+00 4.63e+00 5.75e+00 ph/cm2/s
Error 1.70e-01 1.18e-01 8.94e-02 1.96e-01 3.22e-01 3.95e-01 ph/cm2/s
Fluence Band 7.03e-07 1.32e-06 1.80e-06 4.09e-06 5.10e-06 7.82e-06 erg/cm2
Error 7.26e-08 6.37e-08 9.91e-08 1.35e-06 1.77e-07 1.38e-06 erg/cm2
Peak flux Band 1.17e+00 1.55e+00 1.25e+00 1.63e+00 4.57e+00 5.61e+00 ph/cm2/s
Error 2.36e-01 1.33e-01 9.72e-02 2.62e-01 3.29e-01 4.71e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.552 0.076 - - 2.85e-03 1.12e-04 69.207 57
CPL 1.374 0.255 190.2 5000.0 3.45e-03 9.30e-04 68.443 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.255 0.120 - - 3.92e-02 2.59e-03 42.097 57
CPL 1.205 0.295 829.2 0.0 4.14e-02 2.60e-03 42.145 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: 65.472000 sec.
T50 in the 50-300 keV band: 8.640000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 192.112 -70.520 121.592
T90 124.656 -52.584 72.072
T50 10.528 2.904 13.432
Peak 1.000 0.972 1.972
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
320.5734 +77.0718 0.0069 33.0 114.3 5.0523 27.9 TRIG_00145675
------------------------------------------
Foreground time interval of the image:
-70.520 9.485 (delta_t = 80.005 [sec])
Background time interval of the image:
-244.315 -70.520 (delta_t = 173.795 [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 -70.520 sec. to 121.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55245 ( -7.589149E-02 7.599115E-02) )
Norm@50keV : 2.850216E-03 ( -1.116386E-04 1.115783E-04) )
------------------------------------------------------------
Chi-Squared = 69.20692 using 59 PHA bins.
Reduced chi-squared = 1.214157 for 57 degrees of freedom
Null hypothesis probability = 0.129
Photon flux (15-150 keV) in 192.1 sec: 0.361077 ( -0.015574 0.015639 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.15285e-06 ( -2.13385e-07 2.1423e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -70.520 sec. to 121.592 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37405 ( -0.280955 0.228609 )
Epeak [keV] : 190.170 ( -190.160 9809.83 )
Norm@50keV : 3.447382E-03 ( -6.850173E-04 1.175174E-03) )
------------------------------------------------------------
Chi-Squared = 68.44308 using 59 PHA bins.
but latest trial 1.60116 gives Chi-Squared = 1.95474
Reduced chi-squared = 1.222198 for 56 degrees of freedom
Null hypothesis probability = 0.123
Photon flux (15-150 keV) in 192.1 sec: 0.357209 ( -0.017079 0.020376 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10515e-06 ( -2.36264e-07 2.24968e-07 ) ergs/cm2
Band function
Time interval is from -70.520 sec. to 121.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14757 ( -8.85243 2.74995 )
beta : -1.56348 ( -8.08478 0.426703 )
Epeak [keV] : 58.7476 ( -209.256 9776.27 )
Norm@50keV : 5.460228E-03 ( -6.066663E-04 61344.8 )
------------------------------------------------------------
Chi-Squared = 69.06757 using 59 PHA bins.
Reduced chi-squared = 1.255774 for 55 degrees of freedom
Null hypothesis probability = 9.615E-02
Photon flux (15-150 keV) in 192.1 sec: 0.357228 ( -0.017075 0.016599 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10022e-06 ( -2.35745e-07 1.17777e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.968 sec. to 1.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25505 ( -0.121021 0.119902 )
Norm@50keV : 3.916584E-02 ( -2.592277E-03 2.592169E-03) )
------------------------------------------------------------
Chi-Squared = 42.09719 using 59 PHA bins.
Reduced chi-squared = 0.7385473 for 57 degrees of freedom
Null hypothesis probability = 0.930
Photon flux (15-150 keV) in 1.008 sec: 4.63610 ( -0.3214 0.3222 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94598e-07 ( -2.86695e-08 2.87774e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.968 sec. to 1.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20530 ( -0.423162 0.167401 )
Epeak [keV] : 829.201 ( )
Norm@50keV : 4.138603E-02 ( -2.603710E-03 2.603643E-03) )
------------------------------------------------------------
Chi-Squared = 42.14500 using 59 PHA bins.
Reduced chi-squared = 0.7525892 for 56 degrees of freedom
Null hypothesis probability = 0.915
Photon flux (15-150 keV) in 1.008 sec: 4.63473 ( -0.32125 0.3221 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94689e-07 ( -2.86766e-08 2.88006e-08 ) ergs/cm2
Band function
Time interval is from 0.968 sec. to 1.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.433490 ( -9.56651 3.84728 )
beta : -1.34140 ( -0.237827 0.183513 )
Epeak [keV] : 69.0413 ( -68.9413 9437.06 )
Norm@50keV : 0.122644 ( -0.122644 1147.33 )
------------------------------------------------------------
Chi-Squared = 41.14033 using 59 PHA bins.
Reduced chi-squared = 0.7480059 for 55 degrees of freedom
Null hypothesis probability = 0.917
Photon flux (15-150 keV) in 1.008 sec: 4.57234 ( -0.33865 0.31983 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.89591e-07 ( -2.9982e-08 4.11879e-08 ) ergs/cm2
Plot creation:
Mon Jan 7 13:33:48 EST 2008