batgrbproduct Analysis for Trigger=347761
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 batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Thu Jun 2 16:05:25 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger347761/SDC
======================================================================
Trigger: 00347761 Segment: 000
BAT Trigger Time: 259878885.888 [s; MET]
Trigger Stop: 259878886.912 [s; MET]
UTC: 2009-03-27T20:34:41.277920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 298.751007547588 Dec: 48.9414230565041 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.89
Image Trigger?: NO
Rate S/N Ratio: 7.28010988928052 [ if not an image trigger ]
Image S/N Ratio: 5.89
Flight Position: [ source = BAT ]
RA: 298.751007547588 Dec: 48.9414230565041 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 298.670902494681 Dec: 48.9328107994194 [deg; J2000]
{ 19h 54m 41.0s , +48d 55' 58.1" }
+/- 3.4815629369043 [arcmin] (estimated 90% radius based on SNR)
+/- 1.83580804531568 [arcmin] (formal 1-sigma fit error)
SNR: 5.11864682339136
Angular difference between Flight and Ground position is 3.199205 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 0.000351 0.019266 0.015175 0.000284
0.005118 0.005097 0.004446 0.003750 [error]
Peak 0.000351 0.019266 0.015175 0.000284
0.005118 0.005097 0.004446 0.003750 [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 2.44e-09 5.54e-09 9.96e-09 4.23e-08 2.71e-08 6.03e-08 erg/cm2
Error 1.48e-09 2.19e-09 3.93e-09 3.62e-08 1.02e-08 3.88e-08 erg/cm2
Peak flux Power-law 7.62e-02 9.42e-02 8.47e-02 1.32e-01 3.01e-01 3.87e-01 ph/cm2/s
Error 4.70e-02 3.81e-02 3.27e-02 1.03e-01 1.08e-01 1.43e-01 ph/cm2/s
Fluence Cutoff-PL 4.41e-10 6.66e-09 1.29e-08 1.30e-09 2.13e-08 2.13e-08 erg/cm2
Error 1.11e-09 5.01e-09 5.69e-09 5.50e-09 8.73e-09 9.81e-09 erg/cm2
Peak flux Cutoff-PL 1.27e-02 1.04e-01 1.18e-01 6.98e-03 2.42e-01 2.42e-01 ph/cm2/s
Error 3.38e-02 8.11e-02 4.87e-02 2.46e-02 9.97e-02 1.01e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.156 0.555 - - 2.58e-03 9.04e-04 75.220 57
CPL -6.159 0.000 61.2 19.4 3.85e+00 0.00e+00 69.040 56
The chi2 of BB fit is which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.156 0.555 - - 2.58e-03 9.04e-04 75.220 57
CPL -6.159 0.000 61.2 19.4 3.85e+00 0.00e+00 69.040 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
298.6709 +48.9328 0.0376 6.8 132.3 0.0463 5.1 TRIG_00347761
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.888 -5.888 (delta_t = 55.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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: 1.15612 ( -0.565409 0.544691 )
Norm@50keV : 2.57676E-03 ( -0.000904152 0.000903238 )
------------------------------------------------------------
# Chi-Squared = 75.22 using 59 PHA bins.
# Reduced chi-squared = 1.320 for 57 degrees of freedom
# Null hypothesis probability = 5.328292e-02
Photon flux (15-150 keV) in 1.024 sec: 0.300642 ( -0.107291 0.108454 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71254e-08 ( -1.00803e-08 1.0346e-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: -6.15851 ( )
Epeak [keV] : 61.1828 ( -10.5343 28.302 )
Norm@50keV : 3.85237 ( )
------------------------------------------------------------
# Chi-Squared = 69.04 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 56 degrees of freedom
# Null hypothesis probability = 1.132058e-01
Photon flux (15-150 keV) in 1.024 sec: 0.242096 ( -0.089797 0.10966 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13038e-08 ( -7.59665e-09 9.86593e-09 ) 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 : 4.94599 ( -47.348 -37.3515 )
beta : -9.13313 ( 7.82696 17.8249 )
Epeak [keV] : 62.9644 ( -16.3105 13.2622 )
Norm@50keV : 1.16371 ( -1.26205 0.573873 )
------------------------------------------------------------
# Chi-Squared = 69.04 using 59 PHA bins.
# Reduced chi-squared = 1.255 for 55 degrees of freedom
# Null hypothesis probability = 9.649029e-02
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Peak spectrum fit
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: 1.15612 ( -0.565409 0.544691 )
Norm@50keV : 2.57676E-03 ( -0.000904152 0.000903238 )
------------------------------------------------------------
# Chi-Squared = 75.22 using 59 PHA bins.
# Reduced chi-squared = 1.320 for 57 degrees of freedom
# Null hypothesis probability = 5.328292e-02
Photon flux (15-150 keV) in 1.024 sec: 0.300642 ( -0.107291 0.108454 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71254e-08 ( -1.00803e-08 1.0346e-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: -6.15851 ( )
Epeak [keV] : 61.1828 ( -10.5343 28.302 )
Norm@50keV : 3.85237 ( )
------------------------------------------------------------
# Chi-Squared = 69.04 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 56 degrees of freedom
# Null hypothesis probability = 1.132058e-01
Photon flux (15-150 keV) in 1.024 sec: 0.242096 ( -0.089797 0.10966 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13038e-08 ( -7.59665e-09 9.86593e-09 ) 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 : 4.94599 ( -32.6064 -37.3515 )
beta : -9.13313 ( 7.82696 17.8249 )
Epeak [keV] : 62.9644 ( -16.3105 13.2622 )
Norm@50keV : 1.16371 ( -1.26205 0.573873 )
------------------------------------------------------------
# Chi-Squared = 69.04 using 59 PHA bins.
# Reduced chi-squared = 1.255 for 55 degrees of freedom
# Null hypothesis probability = 9.649029e-02
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Plot creation:
Thu Jun 2 16:33:57 EDT 2011