batgrbproduct Analysis for Trigger=347858
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): Sun Mar 29 01:28:10 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger347858/GCN5_download_cron
======================================================================
Trigger: 00347858 Segment: 000
BAT Trigger Time: 259941570.432 [s; MET]
Trigger Stop: 259941571.456 [s; MET]
UTC: 2009-03-28T13:59:25.819960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 339.232597317245 Dec: -39.3480105136596 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.61
Image Trigger?: NO
Rate S/N Ratio: 26.7581763205193 [ if not an image trigger ]
Image S/N Ratio: 5.61
Flight Position: [ source = BAT ]
RA: 339.232597317245 Dec: -39.3480105136596 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 339.258888269751 Dec: -39.360386276979 [deg; J2000]
{ 22h 37m 02.1s , -39d 21' 37.4" }
+/- 4.25467315412631 [arcmin] (estimated 90% radius based on SNR)
+/- 2.73077203081128 [arcmin] (formal 1-sigma fit error)
SNR: 3.84359916156655
Angular difference between Flight and Ground position is 1.427997 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 0.006485 0.007494 0.019141 0.030264
0.006339 0.007243 0.007191 0.008978 [error]
Peak 0.006485 0.007494 0.019141 0.030264
0.006339 0.007243 0.007191 0.008978 [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 2.28e-11 3.69e-10 5.54e-09 7.88e-07 2.90e-08 2.28e-07 erg/cm2
Error 5.84e-10 2.27e-09 7.04e-09 5.89e-07 2.90e-08 0.00e+00 erg/cm2
Peak flux Power-law 6.68e-04 5.62e-03 4.22e-02 1.81e+00 1.58e-01 1.86e+00 ph/cm2/s
Error 1.79e-02 3.72e-02 6.53e-02 1.37e+00 1.83e-01 1.41e+00 ph/cm2/s
Fluence Cutoff-PL 1.66e-11 3.03e-10 5.15e-09 8.96e-07 2.86e-08 6.67e-07 erg/cm2
Error 4.92e-10 2.07e-09 8.20e-09 6.67e-07 2.52e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.85e-04 4.58e-03 3.89e-02 2.04e+00 1.54e-01 2.08e+00 ph/cm2/s
Error 1.49e-02 3.38e-02 6.59e-02 1.54e+00 1.78e-01 1.58e+00 ph/cm2/s
Fluence Band 1.65e-11 3.00e-10 1.45e-09 3.19e-06 1.84e-08 3.64e-07 erg/cm2
Error 4.38e-09 2.15e-06 2.32e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 6.58e-06 2.77e-04 1.07e-02 6.50e+00 9.10e-02 6.49e+00 ph/cm2/s
Error 1.09e-03 7.57e-03 3.71e-02 5.45e+00 1.16e-01 5.46e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.831 1.450 - - 4.48e-04 1.40e-03 54.384 57
CPL -2.499 0.000 9999.1 5000.0 2.77e-04 1.02e-03 53.990 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.831 1.450 - - 4.48e-04 1.40e-03 54.384 57
CPL -2.499 0.000 9999.1 5000.0 2.77e-04 1.02e-03 53.990 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
339.2589 -39.3604 0.0500 5.2 155.4 0.0592 3.8 TRIG_00347858
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.432 -51.165 (delta_t = 9.267 [sec])
-50.432 -10.432 (delta_t = 40.000 [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: -1.83139 ( -0.703843 2.19560 )
Norm@50keV : 4.475473E-04 ( -4.475473E-04 2.356721E-03) )
------------------------------------------------------------
Chi-Squared = 54.38437 using 59 PHA bins.
Reduced chi-squared = 0.9541118 for 57 degrees of freedom
Null hypothesis probability = 0.574
Photon flux (15-150 keV) in 1.024 sec: 0.158011 ( -0.158011 0.208268 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89721e-08 ( -2.89721e-08 2.89405e-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: -2.49872 ( )
Epeak [keV] : 9999.06 ( -9999.05 0.937500 )
Norm@50keV : 2.771382E-04 ( -1.387505E-04 1.893205E-03) )
------------------------------------------------------------
Chi-Squared = 53.98991 using 59 PHA bins.
Reduced chi-squared = 0.9641055 for 56 degrees of freedom
Null hypothesis probability = 0.551
Photon flux (15-150 keV) in 1.024 sec: 0.153721 ( -0.153721 0.202594 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86049e-08 ( -2.16533e-08 2.87495e-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 : -0.464188 ( -1.296997E-04 14.9999 )
beta : 1.02380 ( -2.24135 0.615676 )
Epeak [keV] : 12.9894 ( -12.8894 9987.01 )
Norm@50keV : 2.089781E-03 ( -5.131021E-02 0.324456 )
------------------------------------------------------------
Chi-Squared = 55.65694 using 59 PHA bins.
Reduced chi-squared = 1.011944 for 55 degrees of freedom
Null hypothesis probability = 0.450
Photon flux (15-150 keV) in 1.024 sec: 9.098238E-02 ( -0.0615429 0.169858 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83759e-08 ( -1.83759e-08 2.80967e-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: -1.83139 ( -0.703843 2.19560 )
Norm@50keV : 4.475473E-04 ( -4.475473E-04 2.356721E-03) )
------------------------------------------------------------
Chi-Squared = 54.38437 using 59 PHA bins.
Reduced chi-squared = 0.9541118 for 57 degrees of freedom
Null hypothesis probability = 0.574
Photon flux (15-150 keV) in 1.024 sec: 0.158011 ( -0.158011 0.208268 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89721e-08 ( -2.89721e-08 2.89405e-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: -2.49872 ( )
Epeak [keV] : 9999.06 ( -9999.05 0.937500 )
Norm@50keV : 2.771382E-04 ( -1.387505E-04 1.893205E-03) )
------------------------------------------------------------
Chi-Squared = 53.98991 using 59 PHA bins.
Reduced chi-squared = 0.9641055 for 56 degrees of freedom
Null hypothesis probability = 0.551
Photon flux (15-150 keV) in 1.024 sec: 0.153721 ( -0.153721 0.202594 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86049e-08 ( -2.16533e-08 2.87495e-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 : -0.464188 ( -1.296997E-04 14.9999 )
beta : 1.02380 ( -2.24135 0.615551 )
Epeak [keV] : 12.9894 ( -12.8894 9987.01 )
Norm@50keV : 2.089781E-03 ( -5.131021E-02 0.324456 )
------------------------------------------------------------
Chi-Squared = 55.65694 using 59 PHA bins.
Reduced chi-squared = 1.011944 for 55 degrees of freedom
Null hypothesis probability = 0.450
Photon flux (15-150 keV) in 1.024 sec: 9.098238E-02 ( -0.0615429 0.169858 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83759e-08 ( -1.83759e-08 2.80967e-08 ) ergs/cm2
Plot creation:
Sun Mar 29 01:37:14 EDT 2009