batgrbproduct Analysis for Trigger=348128
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 v2.45
Process Start Time (local time): Mon Aug 10 16:39:24 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/348128
======================================================================
Trigger: 00348128 Segment: 000
BAT Trigger Time: 260236864 [s; MET]
Trigger Stop: 260236928 [s; MET]
UTC: 2009-04-01T00:00:59.378700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 350.908652961353 Dec: 29.7666028590948 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.41
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.41
Flight Position: [ source = BAT ]
RA: 350.908652961353 Dec: 29.7666028590948 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 350.920731352954 Dec: 29.7630869224082 [deg; J2000]
{ 23h 23m 41.0s , +29d 45' 47.1" }
+/- 0.676073089070937 [arcmin] (estimated 90% radius based on SNR)
+/- 0.210424125853902 [arcmin] (formal 1-sigma fit error)
SNR: 53.208938536644
Angular difference between Flight and Ground position is 0.663522 arcmin
Partial Coding Fraction: 0.3828125 [ including projection effects ]
Duration
T90: 117.004000008106 +/- 14.042885742226
Measured from: 13.6719999909401
to: 130.675999999046 [s; relative to TRIGTIME]
T50: 25.2199999988079 +/- 0.712179771404839
Measured from: 97.3720000088215
to: 122.592000007629 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 122.048000007868
to: 123.048000007868 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.9480000138283
to: 165.00799998641 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.914235 6.419821 4.985251 1.150727
0.114302 0.120608 0.107088 0.087701 [error]
Peak 0.290805 0.468003 0.402817 0.154919
0.013659 0.016183 0.015599 0.011613 [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 1.72e-06 2.93e-06 3.79e-06 9.90e-06 1.12e-05 1.83e-05 erg/cm2
Error 8.58e-08 8.29e-08 1.15e-07 6.96e-07 2.80e-07 7.51e-07 erg/cm2
Peak flux Power-law 3.15e+00 3.55e+00 2.87e+00 3.86e+00 1.10e+01 1.34e+01 ph/cm2/s
Error 1.96e-01 1.36e-01 1.26e-01 3.49e-01 3.91e-01 5.07e-01 ph/cm2/s
Fluence Cutoff-PL 1.68e-06 2.95e-06 3.83e-06 8.58e-06 1.11e-05 1.70e-05 erg/cm2
Error 1.13e-07 8.73e-08 1.27e-07 1.79e-06 3.08e-07 1.82e-06 erg/cm2
Peak flux Cutoff-PL 3.14e+00 3.55e+00 2.87e+00 3.84e+00 1.10e+01 1.34e+01 ph/cm2/s
Error 1.94e-01 1.36e-01 1.26e-01 3.44e-01 3.89e-01 5.04e-01 ph/cm2/s
Fluence Band 1.65e-06 2.94e-06 3.78e-06 9.78e-06 1.11e-05 1.81e-05 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 3.14e+00 3.55e+00 2.87e+00 3.87e+00 1.10e+01 1.34e+01 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 1.628 0.047 - - 6.76e-03 1.64e-04 45.670 57
CPL 1.518 0.157 243.0 0.0 7.59e-03 0.00e+00 44.580 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 1.307 0.060 - - 9.19e-02 3.29e-03 66.240 57
CPL 1.304 0.100 9969.5 0.0 9.23e-02 8.30e-03 66.300 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: 32.768000 sec.
T50 in the 50-300 keV band: 19.840000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 176.956 -11.948 165.008
T90 117.004 13.672 130.676
T50 25.220 97.372 122.592
Peak 1.000 122.048 123.048
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
350.9207 +29.7631 0.0036 36.4 -124.8 18.0224 53.2 TRIG_00348128
------------------------------------------
Foreground time interval of the image:
-4.899 165.008 (delta_t = 169.907 [sec])
Background time interval of the image:
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 -11.948 sec. to 165.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62817 ( -0.0473853 0.0474746 )
Norm@50keV : 6.76419E-03 ( -0.000164183 0.000164167 )
------------------------------------------------------------
# Chi-Squared = 45.67 using 59 PHA bins.
# Reduced chi-squared = 0.8013 for 57 degrees of freedom
# Null hypothesis probability = 8.592808e-01
Photon flux (15-150 keV) in 177 sec: 0.876987 ( -0.0245321 0.0246358 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11605e-05 ( -2.79566e-07 2.79796e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.948 sec. to 165.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51795 ( -0.186232 0.127783 )
Epeak [keV] : 242.972 ( )
Norm@50keV : 7.58533E-03 ( )
------------------------------------------------------------
# Chi-Squared = 44.58 using 59 PHA bins.
# Reduced chi-squared = 0.7961 for 56 degrees of freedom
# Null hypothesis probability = 8.639087e-01
Photon flux (15-150 keV) in 177 sec: 0.868423 ( -0.027847 0.027167 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1083e-05 ( -3.10369e-07 3.06546e-07 ) ergs/cm2
Band function
Time interval is from -11.948 sec. to 165.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.795730 ( 1.1298 1.1298 )
beta : -1.64159 ( -0.0615868 0.0546747 )
Epeak [keV] : 39.3173 ( -39.2783 362.695 )
Norm@50keV : 2.61336E-02 ( -0.026298 840332 )
------------------------------------------------------------
# Chi-Squared = 44.90 using 59 PHA bins.
# Reduced chi-squared = 0.8164 for 55 degrees of freedom
# Null hypothesis probability = 8.325003e-01
Photon flux (15-150 keV) in 177 sec: 0.867067 ( -0.033072 0.026383 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10678e-05 ( -3.06033e-07 3.10033e-07 ) 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 122.048 sec. to 123.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30748 ( -0.0602623 0.060301 )
Norm@50keV : 9.19479E-02 ( -0.00329634 0.00328988 )
------------------------------------------------------------
# Chi-Squared = 66.24 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 57 degrees of freedom
# Null hypothesis probability = 1.883318e-01
Photon flux (15-150 keV) in 1 sec: 10.9849 ( -0.390968 0.391036 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.06969e-07 ( -3.70231e-08 3.71986e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 122.048 sec. to 123.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30392 ( -0.103542 0.0970281 )
Epeak [keV] : 9969.51 ( )
Norm@50keV : 9.23357E-02 ( -0.00331289 0.0132854 )
------------------------------------------------------------
# Chi-Squared = 66.30 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 56 degrees of freedom
# Null hypothesis probability = 1.632316e-01
Photon flux (15-150 keV) in 1 sec: 10.9818 ( -0.3874 0.3913 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.07049e-07 ( -3.6949e-08 3.7004e-08 ) ergs/cm2
Band function
Time interval is from 122.048 sec. to 123.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10296 ( 1.10296 1.10296 )
beta : -1.30746 ( -0.0603635 0.060196 )
Epeak [keV] : 40.8436 ( -40.8436 -40.8436 )
Norm@50keV : 0.159088 ( -0.0703404 12.7851 )
------------------------------------------------------------
# Chi-Squared = 66.24 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 55 degrees of freedom
# Null hypothesis probability = 1.426086e-01
Photon flux (15-150 keV) in 1 sec: 10.9828 ( -0.387 0.3888 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.06409e-07 ( -3.7036e-08 3.7195e-08 ) 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 10:55:45 EDT 2011