batgrbproduct Analysis for Trigger=632158
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): Mon Feb 23 17:18:54 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger632158/GCN5_download_cron
======================================================================
Trigger: 00632158 Segment: 000
BAT Trigger Time: 446300199.52 [s; MET]
Trigger Stop: 446300199.584 [s; MET]
UTC: 2015-02-22T12:16:26.299620 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 293.724289603285 Dec: 21.8878543033797 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.82
Image Trigger?: NO
Rate S/N Ratio: 18.7882942280559 [ if not an image trigger ]
Image S/N Ratio: 7.82
Flight Position: [ source = BAT ]
RA: 293.724289603285 Dec: 21.8878543033797 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 293.714719952588 Dec: 21.8901733939213 [deg; J2000]
{ 19h 34m 51.5s , +21d 53' 24.6" }
+/- 2.48274998615807 [arcmin] (estimated 90% radius based on SNR)
+/- 1.03591504242988 [arcmin] (formal 1-sigma fit error)
SNR: 8.2971395949793
Angular difference between Flight and Ground position is 0.550656 arcmin
Partial Coding Fraction: 0.1542969 [ including projection effects ]
Duration
T90: 0.0759999752044678 +/- 0.0215407028819316
Measured from: 0.00400012731552124
to: 0.080000102519989 [s; relative to TRIGTIME]
T50: 0.0399999618530273 +/- 0.0164924559253201
Measured from: 0.0120001435279846
to: 0.052000105381012 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.449999988079071
to: 0.550000011920929 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00400000810623169
to: 0.0920000076293945 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.062459 0.038510 0.019280 -0.002748
0.008713 0.008221 0.006047 0.003566 [error]
Peak 0.064929 0.038053 0.032417 -0.009463
0.015935 0.016490 0.012702 0.011084 [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 1.94e-08 1.53e-08 8.09e-09 6.23e-09 4.55e-08 4.89e-08 erg/cm2
Error 4.19e-09 3.82e-09 3.92e-09 5.45e-09 1.08e-08 1.34e-08 erg/cm2
Peak flux Power-law 7.77e-01 3.64e-01 1.03e-01 3.67e-02 1.26e+00 1.28e+00 ph/cm2/s
Error 2.88e-01 1.68e-01 9.33e-02 6.44e-02 4.04e-01 4.15e-01 ph/cm2/s
Fluence Cutoff-PL 1.91e-08 1.75e-08 6.44e-09 8.44e-10 4.38e-08 4.38e-08 erg/cm2
Error 4.44e-09 4.90e-09 5.05e-09 4.46e-09 1.05e-08 1.14e-08 erg/cm2
Peak flux Cutoff-PL 7.75e-01 3.64e-01 1.04e-01 3.69e-02 1.26e+00 1.28e+00 ph/cm2/s
Error 2.92e-01 1.85e-01 9.62e-02 5.10e-02 4.03e-01 4.12e-01 ph/cm2/s
Fluence Band 1.89e-08 1.71e-08 7.54e-09 -------- 4.50e-08 4.55e-08 erg/cm2
Error 4.53e-09 4.87e-09 -------- -------- 1.09e-08 1.14e-08 erg/cm2
Peak flux Band 7.76e-01 3.64e-01 1.03e-01 3.66e-02 1.26e+00 1.28e+00 ph/cm2/s
Error -------- 1.84e-01 -------- 6.42e-02 4.04e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.916 0.436 - - 4.47e-02 1.65e-02 48.530 57
CPL 1.717 0.000 8.0 0.0 2.77e-01 0.00e+00 46.550 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.817 1.032 - - 5.24e-03 4.44e-03 69.440 57
CPL 1.583 0.000 16.0 0.0 2.49e-02 0.00e+00 70.500 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 0.088 0.004 0.092
T90 0.076 0.004 0.080
T50 0.040 0.012 0.052
Peak 1.000 -0.450 0.550
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
293.7147 +21.8902 0.0233 37.3 -87.4 0.1262 8.3 TRIG_00632158
------------------------------------------
Foreground time interval of the image:
0.004 0.092 (delta_t = 0.088 [sec])
Background time interval of the image:
-60.520 0.004 (delta_t = 60.524 [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 0.004 sec. to 0.092 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.91553 ( -0.390516 0.480861 )
Norm@50keV : 4.47291E-02 ( -0.016311 0.0167544 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.53 using 59 PHA bins.
# Reduced chi-squared = 0.8514 for 57 degrees of freedom
# Null hypothesis probability = 7.801920e-01
Photon flux (15-150 keV) in 0.088 sec: 11.5759 ( -2.26569 2.2666 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.5547e-08 ( -1.05661e-08 1.10268e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.004 sec. to 0.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71722 ( )
Epeak [keV] : 8.00944 ( )
Norm@50keV : 0.276600 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.55 using 59 PHA bins.
# Reduced chi-squared = 0.8313 for 56 degrees of freedom
# Null hypothesis probability = 8.118244e-01
Photon flux (15-150 keV) in 0.088 sec: 11.6015 ( -2.24064 2.25 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.37965e-08 ( -1.01834e-08 1.08302e-08 ) ergs/cm2
Band function
Time interval is from 0.004 sec. to 0.092 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.71605 ( -1.67979 1.72379 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 8.03098 ( -5.55938 17.4415 )
Norm@50keV : 0.277084 ( -0.155074 21.3487 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.55 using 59 PHA bins.
# Reduced chi-squared = 0.8464 for 55 degrees of freedom
# Null hypothesis probability = 7.841906e-01
Photon flux (15-150 keV) in 0.088 sec: 11.5962 ( -4.5962 -2.23197 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50305e-08 ( -4.50299e-08 -1.18718e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.45612 (-1.10328 1.50317)
R^2/D10^2 : 65.6999 (-43.3437 121.722)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.29 using 59 PHA bins.
# Reduced chi-squared = 0.8823 for 57 degrees of freedom
# Null hypothesis probability = 7.229241e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.969e-08 8.354e-09
25- 50 1.585e-08 6.794e-09
50-150 9.670e-10 7.252e-10
15-150 3.651e-08 1.362e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 22.1716 (-7.73981 11.5999)
Norm : 127.861 (-47.3423 92.9101)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.66 using 59 PHA bins.
# Reduced chi-squared = 0.8185 for 57 degrees of freedom
# Null hypothesis probability = 8.342064e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.895e-08 4.875e-09
25- 50 1.791e-08 6.271e-09
50-150 6.344e-09 4.271e-09
15-150 4.320e-08 1.217e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.13217 (-1.20296 1.36273)
R1^2/D10^2 : 185.945 (-133.52 750.188)
kT2 [keV] : 12.6927 (-4.74231 7.61843)
R2^2/D10^2 : 0.913331 (-0.844401 6.38732)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.61 using 59 PHA bins.
# Reduced chi-squared = 0.8110 for 55 degrees of freedom
# Null hypothesis probability = 8.405575e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.013e-08 1.167e-08
25- 50 1.609e-08 8.246e-09
50-150 9.353e-09 5.971e-09
15-150 4.557e-08 2.240e-08
Peak spectrum fit
Power-law model
Time interval is from -0.450 sec. to 0.550 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.81693 ( -0.718767 1.34433 )
Norm@50keV : 5.23603E-03 ( -0.00523617 0.00363751 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.44 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 57 degrees of freedom
# Null hypothesis probability = 1.248420e-01
Photon flux (15-150 keV) in 1 sec: 1.26474 ( -0.404997 0.403691 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.81793e-08 ( -2.51992e-08 2.67123e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.450 sec. to 0.550 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58253 ( )
Epeak [keV] : 16.0038 ( )
Norm@50keV : 2.49366E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.50 using 59 PHA bins.
# Reduced chi-squared = 1.259 for 56 degrees of freedom
# Null hypothesis probability = 9.201062e-02
Photon flux (15-150 keV) in 1 sec: 1.26472 ( -0.404309 0.40091 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.72175e-08 ( -2.42442e-08 2.77668e-08 ) ergs/cm2
Band function
Time interval is from -0.450 sec. to 0.550 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.09709 ( 2.09709 2.09709 )
beta : -2.81686 ( -1.34084 0.718837 )
Epeak [keV] : 6.96907 ( -6.96907 -6.96907 )
Norm@50keV : 0.711689 ( -0.315409 0.495111 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.44 using 59 PHA bins.
# Reduced chi-squared = 1.263 for 55 degrees of freedom
# Null hypothesis probability = 9.106337e-02
Photon flux (15-150 keV) in 1 sec: 1.26437 ( 5.73563 -0.404335 ) 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] : 3.47220 (-1.2954 8.31455)
R^2/D10^2 : 57.8723 (-58.3494 1017.73)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.60 using 59 PHA bins.
# Reduced chi-squared = 1.309 for 57 degrees of freedom
# Null hypothesis probability = 5.876906e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.539e-08 1.450e-08
25- 50 6.002e-09 3.934e-09
50-150 2.909e-11 3.428e-11
15-150 3.142e-08 1.948e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.4568 (-24.1591 47.0825)
Norm : 9.50951 (-4.64804 43.1912)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.88 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 57 degrees of freedom
# Null hypothesis probability = 1.022359e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.011e-08 1.006e-08
25- 50 2.396e-08 1.529e-08
50-150 1.451e-08 1.216e-08
15-150 5.858e-08 3.444e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.49755 (-1.14132 1.58004)
R1^2/D10^2 : 317.512 (-299.525 40391)
kT2 [keV] : 14.5286 (-5.40832 8.34199)
R2^2/D10^2 : 9.76081E-02 (-0.0806635 0.358235)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.88 using 59 PHA bins.
# Reduced chi-squared = 1.198 for 55 degrees of freedom
# Null hypothesis probability = 1.495401e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.163e-08 1.244e-08
25- 50 1.798e-08 1.123e-08
50-150 2.366e-08 1.763e-08
15-150 6.326e-08 3.530e-08
Plot creation:
Mon Feb 23 17:21:47 EST 2015