batgrbproduct Analysis for Trigger=627137
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): Tue Jan 20 17:23:56 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger627137/GCN5_download_cron
======================================================================
Trigger: 00627137 Segment: 000
BAT Trigger Time: 443415479.488 [s; MET]
Trigger Stop: 443415479.744 [s; MET]
UTC: 2015-01-20T02:57:46.413400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 10.3079848360545 Dec: 33.9812565264564 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.25
Image Trigger?: NO
Rate S/N Ratio: 16.1554944214035 [ if not an image trigger ]
Image S/N Ratio: 7.25
Flight Position: [ source = BAT ]
RA: 10.3079848360545 Dec: 33.9812565264564 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 10.3295655833628 Dec: 33.9801638108343 [deg; J2000]
{ 00h 41m 19.1s , +33d 58' 48.6" }
+/- 1.51666420717323 [arcmin] (estimated 90% radius based on SNR)
+/- 0.640058650959673 [arcmin] (formal 1-sigma fit error)
SNR: 16.7766366100588
Angular difference between Flight and Ground position is 1.075719 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 1.19599992036819 +/- 0.158795406377939
Measured from: -0.31199985742569
to: 0.884000062942505 [s; relative to TRIGTIME]
T50: 0.559999942779541 +/- 0.11207141806269
Measured from: 0.0320001244544983
to: 0.592000067234039 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0639999508857727
to: 0.936000049114227 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.403999984264374
to: 0.952000021934509 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.083299 0.091102 0.062005 0.005261
0.007757 0.007977 0.007161 0.005846 [error]
Peak 0.067121 0.073596 0.052039 0.002142
0.006790 0.007058 0.006340 0.005057 [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 2.67e-08 4.07e-08 4.66e-08 1.02e-07 1.44e-07 2.16e-07 erg/cm2
Error 3.88e-09 3.85e-09 7.12e-09 3.19e-08 1.64e-08 3.87e-08 erg/cm2
Peak flux Power-law 7.00e-01 5.94e-01 3.43e-01 2.96e-01 1.77e+00 1.93e+00 ph/cm2/s
Error 1.10e-01 6.04e-02 5.38e-02 9.10e-02 1.80e-01 1.99e-01 ph/cm2/s
Fluence Cutoff-PL 2.67e-08 4.08e-08 4.67e-08 1.02e-07 1.44e-07 2.13e-07 erg/cm2
Error 3.89e-09 4.26e-09 5.33e-09 6.96e-08 1.70e-08 5.36e-08 erg/cm2
Peak flux Cutoff-PL 7.03e-01 5.94e-01 3.42e-01 2.91e-01 1.77e+00 1.93e+00 ph/cm2/s
Error 1.12e-01 4.92e-02 5.32e-02 -------- 1.80e-01 1.68e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.807 0.179 - - 1.16e-02 1.28e-03 47.310 57
CPL 1.774 0.620 311.3 0.0 1.20e-02 0.00e+00 47.340 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.790 0.189 - - 1.29e-02 1.52e-03 42.900 57
CPL 1.760 0.641 357.3 0.0 1.34e-02 0.00e+00 42.920 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: 1.344000 sec.
T50 in the 50-300 keV band: 0.576000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.356 -0.404 0.952
T90 1.196 -0.312 0.884
T50 0.560 0.032 0.592
Peak 1.000 -0.064 0.936
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
10.3296 +33.9802 0.0115 29.6 -143.7 0.2467 16.8 TRIG_00627137
------------------------------------------
Foreground time interval of the image:
-0.404 0.952 (delta_t = 1.356 [sec])
Background time interval of the image:
-60.488 -0.404 (delta_t = 60.084 [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 -0.404 sec. to 0.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80655 ( -0.175625 0.181713 )
Norm@50keV : 1.15640E-02 ( -0.00129247 0.00126552 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.31 using 59 PHA bins.
# Reduced chi-squared = 0.8301 for 57 degrees of freedom
# Null hypothesis probability = 8.161681e-01
Photon flux (15-150 keV) in 1.356 sec: 1.59756 ( -0.15202 0.15211 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44326e-07 ( -1.62587e-08 1.65128e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.404 sec. to 0.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77404 ( -0.570361 0.669652 )
Epeak [keV] : 311.332 ( )
Norm@50keV : 1.20498E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.34 using 59 PHA bins.
# Reduced chi-squared = 0.8454 for 56 degrees of freedom
# Null hypothesis probability = 7.883271e-01
Photon flux (15-150 keV) in 1.356 sec: 1.59730 ( -0.1522 0.15179 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44411e-07 ( -1.77734e-08 1.62612e-08 ) ergs/cm2
Band function
Time interval is from -0.404 sec. to 0.952 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.48891 ( -4.48891 -4.48891 )
beta : -1.89429 ( -0.222553 0.203135 )
Epeak [keV] : 22.4243 ( -22.4243 4.29859 )
Norm@50keV : 1274.89 ( -120.204 1.05599e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.48 using 59 PHA bins.
# Reduced chi-squared = 0.8451 for 55 degrees of freedom
# Null hypothesis probability = 7.864892e-01
Photon flux (15-150 keV) in 1.356 sec: 1.58728 ( 5.41272 -0.15635 ) 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] : 10.6099 (-1.39288 1.68097)
R^2/D10^2 : 0.581950 (-0.244052 0.406481)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.21 using 59 PHA bins.
# Reduced chi-squared = 1.477 for 57 degrees of freedom
# Null hypothesis probability = 1.104299e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.841e-08 3.295e-09
25- 50 4.965e-08 5.973e-09
50-150 3.068e-08 7.350e-09
15-150 9.875e-08 1.201e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9887 (-29.9368 66.1651)
Norm : 7.01653 (-0.936705 1.06434)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.43 using 59 PHA bins.
# Reduced chi-squared = 0.8671 for 57 degrees of freedom
# Null hypothesis probability = 7.518568e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.487e-08 3.492e-09
25- 50 4.300e-08 4.997e-09
50-150 6.968e-08 2.656e-08
15-150 1.375e-07 2.961e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.18009 (-1.17588 1.33804)
R1^2/D10^2 : 3.43740 (-1.76568 4.27143)
kT2 [keV] : 27.2406 (-7.119 14.2255)
R2^2/D10^2 : 1.44479E-02 (-0.0106238 0.0280739)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.76 using 59 PHA bins.
# Reduced chi-squared = 0.8138 for 55 degrees of freedom
# Null hypothesis probability = 8.363901e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.706e-08 8.539e-09
25- 50 4.045e-08 1.120e-08
50-150 7.975e-08 4.272e-08
15-150 1.473e-07 5.330e-08
Peak spectrum fit
Power-law model
Time interval is from -0.064 sec. to 0.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79016 ( -0.18517 0.192196 )
Norm@50keV : 1.28680E-02 ( -0.00153599 0.00150214 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.90 using 59 PHA bins.
# Reduced chi-squared = 0.7526 for 57 degrees of freedom
# Null hypothesis probability = 9.169481e-01
Photon flux (15-150 keV) in 1 sec: 1.76646 ( -0.179742 0.179823 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18507e-07 ( -1.43239e-08 1.45506e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.064 sec. to 0.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76030 ( -0.617083 0.665698 )
Epeak [keV] : 357.335 ( )
Norm@50keV : 1.33653E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.92 using 59 PHA bins.
# Reduced chi-squared = 0.7665 for 56 degrees of freedom
# Null hypothesis probability = 9.003071e-01
Photon flux (15-150 keV) in 1 sec: 1.76658 ( -0.18011 0.17915 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18469e-07 ( -1.5538e-08 1.4462e-08 ) ergs/cm2
Band function
Time interval is from -0.064 sec. to 0.936 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.70635 ( -4.29021 -4.29021 )
beta : -1.89933 ( -0.279788 0.221016 )
Epeak [keV] : 24.5447 ( -23.5292 4.51841 )
Norm@50keV : 37.9429 ( -37.9335 986.092 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.73 using 59 PHA bins.
# Reduced chi-squared = 0.7587 for 55 degrees of freedom
# Null hypothesis probability = 9.065315e-01
Photon flux (15-150 keV) in 1 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] : 10.4874 (-1.44449 1.78417)
R^2/D10^2 : 0.676877 (-0.296701 0.504052)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.54 using 59 PHA bins.
# Reduced chi-squared = 1.308 for 57 degrees of freedom
# Null hypothesis probability = 5.936661e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.538e-08 2.515e-09
25- 50 4.085e-08 5.455e-09
50-150 2.443e-08 7.410e-09
15-150 8.066e-08 1.079e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9150 (-29.9885 80.2427)
Norm : 7.78333 (-1.1344 1.18835)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.70 using 59 PHA bins.
# Reduced chi-squared = 0.7842 for 57 degrees of freedom
# Null hypothesis probability = 8.817300e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.034e-08 3.125e-09
25- 50 3.517e-08 4.535e-09
50-150 5.697e-08 2.227e-08
15-150 1.125e-07 2.756e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.34857 (-1.24513 1.44224)
R1^2/D10^2 : 3.45972 (-1.80584 2.66438)
kT2 [keV] : 28.2876 (-8.06286 19.0183)
R2^2/D10^2 : 1.40227E-02 (-0.0110881 0.0320285)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.33 using 59 PHA bins.
# Reduced chi-squared = 0.7333 for 55 degrees of freedom
# Null hypothesis probability = 9.307465e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.182e-08 7.447e-09
25- 50 3.345e-08 1.225e-08
50-150 6.572e-08 3.581e-08
15-150 1.210e-07 4.697e-08
Plot creation:
Tue Jan 20 17:28:04 EST 2015