batgrbproduct Analysis for Trigger=352293
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 10:16:50 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger352293/SDC
======================================================================
Trigger: 00352293 Segment: 000
BAT Trigger Time: 264236122.304 [s; MET]
Trigger Stop: 264236149.184 [s; MET]
UTC: 2009-05-17T06:55:17.555820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 146.087313283489 Dec: 38.789394893341 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.67
Image Trigger?: NO
Rate S/N Ratio: 25.4165300542777 [ if not an image trigger ]
Image S/N Ratio: 5.67
Flight Position: [ source = BAT ]
RA: 146.087313283489 Dec: 38.789394893341 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 146.103247618161 Dec: 38.763468799923 [deg; J2000]
{ 09h 44m 24.8s , +38d 45' 48.5" }
+/- 3.94355182296708 [arcmin] (estimated 90% radius based on SNR)
+/- 3.1764887815226 [arcmin] (formal 1-sigma fit error)
SNR: 4.28400972523564
Angular difference between Flight and Ground position is 1.724911 arcmin
Partial Coding Fraction: 0.2109375 [ including projection effects ]
Duration
T90: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
T50: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 26.8799999952316 second)
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.287336 0.284505 0.086916 0.079675
0.068481 0.068064 0.060504 0.055416 [error]
Peak 0.287336 0.284505 0.086916 0.079675
0.068481 0.068064 0.060504 0.055416 [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 1.04e-07 1.29e-07 1.16e-07 1.83e-07 4.12e-07 5.32e-07 erg/cm2
Error 4.01e-08 3.68e-08 5.71e-08 2.11e-07 1.35e-07 2.49e-07 erg/cm2
Peak flux Power-law 1.26e-01 8.69e-02 3.92e-02 2.46e-02 2.64e-01 2.77e-01 ph/cm2/s
Error 4.97e-02 2.45e-02 1.86e-02 2.26e-02 7.48e-02 7.78e-02 ph/cm2/s
Fluence Cutoff-PL 9.95e-08 1.41e-07 1.08e-07 4.87e-08 3.81e-07 3.97e-07 erg/cm2
Error 4.35e-08 5.31e-08 8.78e-08 1.84e-07 1.55e-07 2.85e-07 erg/cm2
Peak flux Cutoff-PL 1.20e-01 9.47e-02 3.71e-02 8.37e-03 2.58e-01 2.60e-01 ph/cm2/s
Error 5.46e-02 3.56e-02 2.95e-02 2.68e-02 7.74e-02 8.55e-02 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 2.147 0.549 - - 1.64e-03 6.00e-04 47.840 57
CPL 1.398 3.237 31.1 0.0 4.67e-03 0.00e+00 47.560 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 2.147 0.549 - - 1.64e-03 6.00e-04 47.840 57
CPL 1.398 3.237 31.1 0.0 4.67e-03 0.00e+00 47.560 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 26.880 0.000 26.880
T90 26.880 0.000 26.880
T50 26.880 0.000 26.880
Peak 26.880 0.000 26.880
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
146.1032 +38.7635 0.0450 51.1 -11.8 0.9111 4.3 TRIG_00352293
------------------------------------------
Foreground time interval of the image:
0.000 26.880 (delta_t = 26.880 [sec])
Background time interval of the image:
-60.304 -42.304 (delta_t = 18.000 [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 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14734 ( -0.506752 0.591647 )
Norm@50keV : 1.64134E-03 ( -0.000615314 0.00058433 )
------------------------------------------------------------
# Chi-Squared = 47.84 using 59 PHA bins.
# Reduced chi-squared = 0.8394 for 57 degrees of freedom
# Null hypothesis probability = 8.009271e-01
Photon flux (15-150 keV) in 26.88 sec: 0.264427 ( -0.0747349 0.0748479 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.12001e-07 ( -1.31555e-07 1.3805e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39760 ( -5.80018 0.673129 )
Epeak [keV] : 31.1243 ( )
Norm@50keV : 4.67410E-03 ( )
------------------------------------------------------------
# Chi-Squared = 47.56 using 59 PHA bins.
# Reduced chi-squared = 0.8492 for 56 degrees of freedom
# Null hypothesis probability = 7.817461e-01
Photon flux (15-150 keV) in 26.88 sec: 0.258126 ( -0.078624 0.076217 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80672e-07 ( -1.50002e-07 1.60823e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.71597 ( -8.6745 -8.6745 )
beta : -2.47612 ( -2.35208 0.692669 )
Epeak [keV] : 24.6155 ( -24.6151 10.4575 )
Norm@50keV : 214.833 ( -214.832 75.2351 )
------------------------------------------------------------
# Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8505 for 55 degrees of freedom
# Null hypothesis probability = 7.770080e-01
Photon flux (15-150 keV) in 26.88 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 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14734 ( -0.506752 0.591647 )
Norm@50keV : 1.64134E-03 ( -0.000615314 0.00058433 )
------------------------------------------------------------
# Chi-Squared = 47.84 using 59 PHA bins.
# Reduced chi-squared = 0.8394 for 57 degrees of freedom
# Null hypothesis probability = 8.009271e-01
Photon flux (15-150 keV) in 26.88 sec: 0.264427 ( -0.0747349 0.0748479 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.12001e-07 ( -1.31555e-07 1.3805e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39760 ( -5.80018 0.673129 )
Epeak [keV] : 31.1243 ( )
Norm@50keV : 4.67410E-03 ( )
------------------------------------------------------------
# Chi-Squared = 47.56 using 59 PHA bins.
# Reduced chi-squared = 0.8492 for 56 degrees of freedom
# Null hypothesis probability = 7.817461e-01
Photon flux (15-150 keV) in 26.88 sec: 0.258126 ( -0.078624 0.076217 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80672e-07 ( -1.50002e-07 1.60823e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.71597 ( -8.6745 -8.6745 )
beta : -2.47612 ( -2.35208 0.692669 )
Epeak [keV] : 24.6155 ( -24.6151 10.4575 )
Norm@50keV : 214.833 ( -214.832 75.2351 )
------------------------------------------------------------
# Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8505 for 55 degrees of freedom
# Null hypothesis probability = 7.770080e-01
Photon flux (15-150 keV) in 26.88 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 10:24:06 EDT 2011