batgrbproduct Analysis for Trigger=351145
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 v2.44
Process Start Time (local time): Sun May 3 12:48:48 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger351145/GCN5_download_cron
======================================================================
Trigger: 00351145 Segment: 000
BAT Trigger Time: 263053514.816 [s; MET]
Trigger Stop: 263053515.84 [s; MET]
UTC: 2009-05-03T14:25:10.105600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 46.8212923140705 Dec: -25.7969592538773 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.73
Image Trigger?: NO
Rate S/N Ratio: 16.062378404209 [ if not an image trigger ]
Image S/N Ratio: 5.73
Flight Position: [ source = BAT ]
RA: 46.8212923140705 Dec: -25.7969592538773 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 46.8127330642945 Dec: -25.7834658798145 [deg; J2000]
{ 03h 07m 15.1s , -25d 47' 00.5" }
+/- 6.29576056183746 [arcmin] (estimated 90% radius based on SNR)
+/- 4.73205621141085 [arcmin] (formal 1-sigma fit error)
SNR: 2.19594241627237
Angular difference between Flight and Ground position is 0.932347 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.001856 -0.001781 0.012978 0.014547
0.005661 0.005988 0.005719 0.006580 [error]
Peak 0.001856 -0.001781 0.012978 0.014547
0.005661 0.005988 0.005719 0.006580 [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 4.67e-11 4.38e-10 4.76e-09 3.85e-07 2.11e-08 3.22e-07 erg/cm2
Error 1.36e-09 5.39e-09 3.37e-07 1.88e-08 3.26e-07 0.00e+00 erg/cm2
Peak flux Power-law 1.09e-03 6.79e-03 3.68e-02 9.11e-01 1.21e-01 9.57e-01 ph/cm2/s
Error 1.13e-02 2.23e-02 4.32e-02 8.00e-01 1.18e-01 8.30e-01 ph/cm2/s
Fluence Cutoff-PL 2.86e-11 3.77e-10 4.53e-09 4.32e-07 2.11e-08 4.30e-07 erg/cm2
Error 3.58e-10 1.34e-09 5.37e-09 3.83e-07 1.88e-08 3.85e-07 erg/cm2
Peak flux Cutoff-PL 3.69e-04 3.57e-03 3.01e-02 1.38e+00 1.12e-01 1.25e+00 ph/cm2/s
Error 1.07e-02 2.16e-02 4.42e-02 1.45e+00 1.16e-01 1.43e+00 ph/cm2/s
Fluence Band 3.87e-12 1.39e-10 2.97e-09 7.16e-07 1.95e-08 9.03e-08 erg/cm2
Error 5.90e-09 8.38e-07 1.94e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 5.71e-04 3.74e-03 3.02e-02 1.37e+00 1.16e-01 1.21e+00 ph/cm2/s
Error 1.07e-02 2.16e-02 4.66e-02 2.08e+00 1.16e-01 3.10e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.337 1.590 - - 4.54e-04 8.39e-04 54.167 57
CPL -2.217 1.741 9999.3 5000.0 2.05e-04 8.26e-04 54.020 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.337 1.590 - - 4.54e-04 8.39e-04 54.167 57
CPL -2.217 1.741 9999.3 5000.0 2.05e-04 8.26e-04 54.020 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
46.8127 -25.7835 0.0870 6.2 -124.2 0.0271 2.2 TRIG_00351145
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.816 -10.816 (delta_t = 50.000 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.33685 ( -1.29191 1.88878 )
Norm@50keV : 4.535486E-04 ( -4.535487E-04 1.223817E-03) )
------------------------------------------------------------
Chi-Squared = 54.16681 using 59 PHA bins.
Reduced chi-squared = 0.9502950 for 57 degrees of freedom
Null hypothesis probability = 0.582
Photon flux (15-150 keV) in 1.024 sec: 0.120792 ( -0.120792 0.11464 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11139e-08 ( -2.11139e-08 1.63874e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.21690 ( -0.783097 2.69792 )
Epeak [keV] : 9999.33 ( -9999.32 0.667969 )
Norm@50keV : 2.051001E-04 ( -2.051001E-04 1.447861E-03) )
------------------------------------------------------------
Chi-Squared = 54.01957 using 59 PHA bins.
Reduced chi-squared = 0.9646351 for 56 degrees of freedom
Null hypothesis probability = 0.550
Photon flux (15-150 keV) in 1.024 sec: 0.112102 ( -0.112102 0.120187 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11375e-08 ( -2.11375e-08 1.65029e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.600884 ( -10.6009 4.39912 )
beta : 1.43841 ( -1.98606 1.18607 )
Epeak [keV] : 19.0726 ( -18.9726 9980.93 )
Norm@50keV : 7.925091E-04 ( -7.925091E-04 15006.8 )
------------------------------------------------------------
Chi-Squared = 54.15814 using 59 PHA bins.
Reduced chi-squared = 0.9846935 for 55 degrees of freedom
Null hypothesis probability = 0.507
Photon flux (15-150 keV) in 1.024 sec: 0.116408 ( -0.116408 0.116211 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95069e-08 ( -1.95069e-08 1.93677e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.33685 ( -1.29191 1.88878 )
Norm@50keV : 4.535486E-04 ( -4.535487E-04 1.223817E-03) )
------------------------------------------------------------
Chi-Squared = 54.16681 using 59 PHA bins.
Reduced chi-squared = 0.9502950 for 57 degrees of freedom
Null hypothesis probability = 0.582
Photon flux (15-150 keV) in 1.024 sec: 0.120792 ( -0.120792 0.11464 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11139e-08 ( -2.11139e-08 1.63874e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.21690 ( -0.783097 2.69792 )
Epeak [keV] : 9999.33 ( -9999.32 0.667969 )
Norm@50keV : 2.051001E-04 ( -2.051001E-04 1.447861E-03) )
------------------------------------------------------------
Chi-Squared = 54.01957 using 59 PHA bins.
Reduced chi-squared = 0.9646351 for 56 degrees of freedom
Null hypothesis probability = 0.550
Photon flux (15-150 keV) in 1.024 sec: 0.112102 ( -0.112102 0.120187 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11375e-08 ( -2.11375e-08 1.65029e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.600884 ( -10.6009 4.39912 )
beta : 1.43841 ( -1.98606 1.18317 )
Epeak [keV] : 19.0726 ( -18.9726 9980.93 )
Norm@50keV : 7.925091E-04 ( -7.925091E-04 15006.8 )
------------------------------------------------------------
Chi-Squared = 54.15814 using 59 PHA bins.
Reduced chi-squared = 0.9846935 for 55 degrees of freedom
Null hypothesis probability = 0.507
Photon flux (15-150 keV) in 1.024 sec: 0.116408 ( -0.116408 0.116211 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95069e-08 ( -1.95069e-08 1.93677e-08 ) ergs/cm2
Plot creation:
Sun May 3 12:54:56 EDT 2009