batgrbproduct Analysis for Trigger=351744
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): Tue May 12 20:35:19 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger351744/GCN5_download_cron
======================================================================
Trigger: 00351744 Segment: 000
BAT Trigger Time: 263801506.56 [s; MET]
Trigger Stop: 263801510.656 [s; MET]
UTC: 2009-05-12T06:11:41.825740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 168.273567523314 Dec: -81.3274923145126 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.22
Image Trigger?: NO
Rate S/N Ratio: 11.2249721603218 [ if not an image trigger ]
Image S/N Ratio: 6.22
Flight Position: [ source = BAT ]
RA: 168.273567523314 Dec: -81.3274923145126 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 168.297758312615 Dec: -81.2684376441356 [deg; J2000]
{ 11h 13m 11.5s , -81d 16' 06.4" }
+/- 3.33921972768543 [arcmin] (estimated 90% radius based on SNR)
+/- 1.65639150621523 [arcmin] (formal 1-sigma fit error)
SNR: 5.43318005650215
Angular difference between Flight and Ground position is 3.550079 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 4.0959999859333 +/-
Measured from: 0
to: 4.0959999859333 [s; relative to TRIGTIME]
T50: 4.0959999859333 +/-
Measured from: 0
to: 4.0959999859333 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 4.0959999859333 second)
Measured from: -1.49011611938477e-08
to: 4.09599997103214 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 4.0959999859333 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.046483 0.044191 0.001100 0.003721
0.010789 0.010750 0.008832 0.007803 [error]
Peak 0.046483 0.044191 0.001100 0.003721
0.010789 0.010750 0.008832 0.007803 [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 1.27e-08 1.35e-08 1.02e-08 1.24e-08 4.11e-08 4.96e-08 erg/cm2
Error 4.44e-09 4.80e-09 6.29e-09 1.39e-08 1.61e-08 2.48e-08 erg/cm2
Peak flux Power-law 1.02e-01 6.03e-02 2.27e-02 1.13e-02 1.91e-01 1.96e-01 ph/cm2/s
Error 3.62e-02 2.09e-02 1.36e-02 1.38e-02 6.00e-02 6.24e-02 ph/cm2/s
Fluence Cutoff-PL 1.15e-08 2.12e-08 4.40e-09 2.73e-11 3.71e-08 3.74e-08 erg/cm2
Error 4.67e-09 6.90e-09 5.62e-09 6.56e-10 1.13e-08 1.13e-08 erg/cm2
Peak flux Cutoff-PL 8.83e-02 9.52e-02 1.14e-02 3.87e-05 1.95e-01 1.95e-01 ph/cm2/s
Error 3.71e-02 2.98e-02 1.35e-02 8.50e-04 5.49e-02 5.50e-02 ph/cm2/s
Fluence Band 1.20e-08 2.17e-08 3.92e-09 9.53e-11 3.70e-08 3.92e-08 erg/cm2
Error 7.23e-09 2.82e-09 1.14e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 9.25e-02 8.64e-02 1.65e-02 3.57e-04 1.99e-01 1.99e-01 ph/cm2/s
Error 4.38e-02 2.64e-02 1.49e-02 2.82e-03 5.65e-02 5.70e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.413 0.577 - - 1.03e-03 4.89e-04 68.418 57
CPL -2.485 0.000 31.1 6.4 1.59e+00 4.45e+00 61.492 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.413 0.577 - - 1.03e-03 4.89e-04 68.418 57
CPL -2.485 0.000 31.1 6.4 1.59e+00 4.45e+00 61.492 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 4.096 0.000 4.096
T90 4.096 0.000 4.096
T50 4.096 0.000 4.096
Peak 4.096 -0.000 4.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
168.2978 -81.2684 0.0352 21.7 -164.8 0.1051 5.4 TRIG_00351744
------------------------------------------
Foreground time interval of the image:
0.000 4.096 (delta_t = 4.096 [sec])
Background time interval of the image:
-60.560 -18.560 (delta_t = 42.000 [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 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.41270 ( -0.511487 0.642308 )
Norm@50keV : 1.025538E-03 ( -4.796256E-04 4.979551E-04) )
------------------------------------------------------------
Chi-Squared = 68.41833 using 59 PHA bins.
Reduced chi-squared = 1.200322 for 57 degrees of freedom
Null hypothesis probability = 0.143
Photon flux (15-150 keV) in 4.096 sec: 0.191181 ( -0.059682 0.060288 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.11275e-08 ( -1.53416e-08 1.69026e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.48533 ( )
Epeak [keV] : 31.0771 ( -6.02187 6.76714 )
Norm@50keV : 1.58810 ( -3.16677 5.73082 )
------------------------------------------------------------
Chi-Squared = 61.49179 using 59 PHA bins.
Reduced chi-squared = 1.098068 for 56 degrees of freedom
Null hypothesis probability = 0.286
Photon flux (15-150 keV) in 4.096 sec: 0.195005 ( -0.054416 0.055326 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.71194e-08 ( -1.09543e-08 1.15546e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.773632E-02 ( -4.93034 0.167395 )
beta : -9.37043 ( -0.628423 19.3716 )
Epeak [keV] : 28.5766 ( -7.12544 9971.42 )
Norm@50keV : 3.382574E-02 ( -51.2326 111.415 )
------------------------------------------------------------
Chi-Squared = 63.21215 using 59 PHA bins.
Reduced chi-squared = 1.149312 for 55 degrees of freedom
Null hypothesis probability = 0.209
Photon flux (15-150 keV) in 4.096 sec: 0.199327 ( -0.056459 0.056458 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.69768e-08 ( -1.07557e-08 1.20605e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.41270 ( -0.511487 0.642308 )
Norm@50keV : 1.025538E-03 ( -4.796256E-04 4.979551E-04) )
------------------------------------------------------------
Chi-Squared = 68.41833 using 59 PHA bins.
Reduced chi-squared = 1.200322 for 57 degrees of freedom
Null hypothesis probability = 0.143
Photon flux (15-150 keV) in 4.096 sec: 0.191181 ( -0.059682 0.060288 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.11275e-08 ( -1.53416e-08 1.69026e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.48533 ( )
Epeak [keV] : 31.0771 ( -6.02187 6.76714 )
Norm@50keV : 1.58810 ( -3.16677 5.73082 )
------------------------------------------------------------
Chi-Squared = 61.49179 using 59 PHA bins.
Reduced chi-squared = 1.098068 for 56 degrees of freedom
Null hypothesis probability = 0.286
Photon flux (15-150 keV) in 4.096 sec: 0.195005 ( -0.054416 0.055326 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.71194e-08 ( -1.09543e-08 1.15546e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.773632E-02 ( -4.93034 0.167395 )
beta : -9.37043 ( -0.628423 19.3714 )
Epeak [keV] : 28.5766 ( -3.35781 9971.42 )
Norm@50keV : 3.382574E-02 ( -51.2326 111.415 )
------------------------------------------------------------
Chi-Squared = 63.21215 using 59 PHA bins.
Reduced chi-squared = 1.149312 for 55 degrees of freedom
Null hypothesis probability = 0.209
Photon flux (15-150 keV) in 4.096 sec: 0.199327 ( -0.056459 0.056458 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.69768e-08 ( -1.07557e-08 1.20605e-08 ) ergs/cm2
Plot creation:
Tue May 12 20:46:13 EDT 2009