Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
 
#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  206.6255    33.2856   0.0136    27.7291  -137.5581         0.3223930     14.231 TRIG_00610501                 
 
Foreground time interval of the image:
  0.264   3.640 (delta_t =   3.376 [sec])
Background time interval of the image:
-571.111 -556.375 (delta_t =  14.736 [sec])
-239.512   0.264 (delta_t = 239.776 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
 8 ms binning
 From T100_start-3 s to T100_start+3 s
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
 2 ms binning
 From T100_start-1 s to T100_start+1 s
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
 SN=5 or 10 sec. binning (whichever binning is satisfied first)
 
 SN=5 or 10 sec. binning (T < 200 sec) 
 
 Quad-rate summed light curves (from T0-300s to T0+1000s)
 
Spectral Evolution
 
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
 
Time interval is from    0.264 sec. to    3.640 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.98807     ( -0.20368   0.213875 )
Norm@50keV  : 5.87742E-03    ( -0.000827155   0.000806478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.22 using 59 PHA bins.
# Reduced chi-squared =         0.9513 for     57 degrees of freedom 
# Null hypothesis probability =   5.799863e-01
 
Photon flux (15-150 keV)    in 3.376 sec: 0.876813 ( -0.0938092  0.093818 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.82872e-07 ( -2.39703e-08  2.45659e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    0.264 sec. to    3.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.99011     ( -0.651467   0.646308 )
Epeak [keV] : 9999.23      ( -9971.62 -9999.36 )
Norm@50keV  : 5.86979E-03    ( -0.00309409   0.0171017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.22 using 59 PHA bins.
# Reduced chi-squared =         0.9682 for     56 degrees of freedom 
# Null hypothesis probability =   5.424611e-01
 
Photon flux (15-150 keV)    in 3.376 sec: 0.876531 ( -0.093794  0.093768 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.82761e-07 ( -3.12496e-08  2.43389e-08 ) ergs/cm2
 
Band function
 
Time interval is from    0.264 sec. to    3.640 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 2.84607   ( -3.56548   -3.56548 )
beta        : -2.12441    ( -0.383589   0.281659 )
Epeak [keV] : 23.0398      ( -22.4492 14.2069 )
Norm@50keV   : 34.9527    ( -34.9358   805.571 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.90 using 59 PHA bins.
# Reduced chi-squared =         0.9618 for     55 degrees of freedom 
# Null hypothesis probability =   5.553620e-01
 
Photon flux (15-150 keV)    in 3.376 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]    : 8.93306  (-1.07767  1.24762)
R^2/D10^2   : 0.622334  (-0.249231   0.407512)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.54 using 59 PHA bins.
# Reduced chi-squared =          1.255 for     57 degrees of freedom 
# Null hypothesis probability =   9.311039e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.252e-08   5.991e-09
25- 50  6.831e-08   9.571e-09
50-150  2.547e-08   8.832e-09
15-150  1.263e-07   1.786e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 63.9411       (-19.1626      33.9553)
Norm        : 4.45082       (-0.775673     0.948549)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.63 using 59 PHA bins.
# Reduced chi-squared =         0.9760 for     57 degrees of freedom 
# Null hypothesis probability =   5.266232e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.813e-08   5.229e-09
25- 50  5.914e-08   7.258e-09
50-150  7.086e-08   2.080e-08
15-150  1.681e-07   2.586e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.34348        (-1.44502      1.30613)
R1^2/D10^2  : 1.20187        (-0.504137      1.38008)
kT2 [keV]   : 63.2496        (-42.2606      -64.9434)
R2^2/D10^2  : 6.17781E-04    (-0.000521747   0.010773)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.94 using 59 PHA bins.
# Reduced chi-squared =         0.9263 for     55 degrees of freedom 
# Null hypothesis probability =   6.302695e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.760e-08   9.951e-09
25- 50  6.098e-08   1.638e-08
50-150  9.634e-08   5.149e-08
15-150  1.949e-07   6.428e-08
Peak spectrum fit
Power-law model
 
Time interval is from    0.340 sec. to    1.340 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.86872     ( -0.257005   0.27423 )
Norm@50keV  : 8.26970E-03    ( -0.00150231   0.00146106 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.55 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     57 degrees of freedom 
# Null hypothesis probability =   4.547196e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.17134 ( -0.171575  0.171594 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.60254e-08 ( -1.34366e-08  1.38502e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    0.340 sec. to    1.340 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.790869     ( -1.77095   1.26576 )
Epeak [keV] : 45.6452      ( -41.5961 -45.6398 )
Norm@50keV  : 3.54639E-02    ( -0.0355056   0.368194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.57 using 59 PHA bins.
# Reduced chi-squared =         0.9923 for     56 degrees of freedom 
# Null hypothesis probability =   4.910456e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.12877 ( -0.178202  0.17899 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.77882e-08 ( -1.4316e-08  1.67732e-08 ) ergs/cm2
 
Band function
 
Time interval is from    0.340 sec. to    1.340 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.08880   ( 0.697531   0.697531 )
beta        : -2.48547    ( 2.69084   0.92786 )
Epeak [keV] : 47.8663      ( -43.0618 31.6413 )
Norm@50keV   : 2.36086E-02    ( -0.0523611   346.322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.51 using 59 PHA bins.
# Reduced chi-squared =          1.009 for     55 degrees of freedom 
# Null hypothesis probability =   4.554682e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.97349e-08 ( 0  0 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 10.3906  (-1.54214  1.83577)
R^2/D10^2   : 0.491103  (-0.226772   0.409822)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.94 using 59 PHA bins.
# Reduced chi-squared =          1.052 for     57 degrees of freedom 
# Null hypothesis probability =   3.696088e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.093e-08   2.776e-09
25- 50  2.866e-08   6.410e-09
50-150  1.669e-08   6.117e-09
15-150  5.627e-08   1.235e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 78.1608       (-29.2587      67.0934)
Norm        : 5.58809       (-1.10556     1.41703)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.92 using 59 PHA bins.
# Reduced chi-squared =         0.9811 for     57 degrees of freedom 
# Null hypothesis probability =   5.155778e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.448e-08   3.300e-09
25- 50  2.370e-08   4.315e-09
50-150  3.293e-08   1.820e-08
15-150  7.110e-08   1.973e-08
Double BB
 
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 40.2898        (      )
R1^2/D10^2  : 1.78071E-03        (-0.00161574      0.479281)
kT2 [keV]   : 8.70552        (-4.70028      2.21342)
R2^2/D10^2  : 0.835053    (-0.745226   -0.815881)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.07 using 59 PHA bins.
#Fit statistic : Chi-Squared =          55.99 using 59 PHA bins.
# Reduced chi-squared =          1.019 for     55 degrees of freedom 
# Reduced chi-squared =          1.018 for     55 degrees of freedom 
# Null hypothesis probability =   4.346692e-01
# Null hypothesis probability =   4.373385e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.353e-08   7.495e-09
25- 50  2.528e-08   1.325e-08
50-150  2.699e-08   1.543e-08
15-150  6.580e-08   3.334e-08
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
 
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.98807     ( -0.20368   0.213875 )
Norm@50keV  : 5.87742E-03    ( -0.000827155   0.000806478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.22 using 59 PHA bins.
# Reduced chi-squared =         0.9513 for     57 degrees of freedom 
# Null hypothesis probability =   5.799863e-01
 
Photon flux (15-150 keV)    in 3.376 sec: 0.876813 ( -0.0938092  0.093818 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.82872e-07 ( -2.39703e-08  2.45659e-08 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.99011     ( -0.651467   0.646308 )
Epeak [keV] : 9999.23      ( -9971.62 -9999.36 )
Norm@50keV  : 5.86979E-03    ( -0.00309409   0.0171017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.22 using 59 PHA bins.
# Reduced chi-squared =         0.9682 for     56 degrees of freedom 
# Null hypothesis probability =   5.424611e-01
 
Photon flux (15-150 keV)    in 3.376 sec: 0.876531 ( -0.093794  0.093768 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.82761e-07 ( -3.12493e-08  2.43754e-08 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 2.84607   ( -3.56548   -3.56548 )
beta        : -2.12441    ( -0.383589   0.281659 )
Epeak [keV] : 23.0398      ( -22.4492 14.2069 )
Norm@50keV   : 34.9527    ( -34.9358   805.865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.90 using 59 PHA bins.
# Reduced chi-squared =         0.9618 for     55 degrees of freedom 
# Null hypothesis probability =   5.553620e-01
 
Photon flux (15-150 keV)    in 3.376 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
 S(25-50 keV) vs. S(50-100 keV) plot 
 
S(25-50 keV)  = 5.49e-08
S(50-100 keV) = 5.53e-08
 T90 vs. Hardness ratio plot 
 
T90                                   = 3.08399993181229 sec.
Hardness ratio (energy fluence ratio) = 1.00729
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.01035
Count Ratio (50-100 keV) / (15-25 keV) = 0.483185
 Mask shadow pattern 
 
IMX = -3.879169240787561E-01, IMY = 3.547370087916024E-01
 TIME vs. PHA plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
 TIME vs. DetID plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
 100 us light curve (15-350 keV)
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
 Spacecraft aspect plot 
 
 Bright source in the pre-burst/pre-slew/post-slew images 
 Pre-burst image of 15-350 keV band 
Time interval of the image:
-571.111390 -556.374900
-239.512000 0.264000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4164  35.3336    2.1  27.1  129.1   1.4501   5.5    2.1	Her X-1                       
244.2953   5.3212    2.5  52.4  159.9   4.3873   4.5 ------	UNKNOWN                       
237.6555  20.5504    3.3  36.3  165.5   0.9953   3.5 ------	UNKNOWN                       
250.0716  65.8697    3.1  13.8   37.1   0.7472   3.7 ------	UNKNOWN                       
 41.2806  66.8622    3.5  56.7    2.8   3.4656   3.3 ------	UNKNOWN                       
235.3429  50.3450    2.9   7.1  144.5   0.7608   4.0 ------	UNKNOWN                       
192.1409  34.6536    3.0  33.1 -116.0   1.2342   3.9 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
0.264000 3.640000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4328  35.2431    6.8  27.2  129.2  -0.0460  -1.7    6.1	Her X-1                       
264.1628  19.2900    2.6  45.3  129.4   0.3536   4.5 ------	UNKNOWN                       
242.7857   5.0346    2.7  52.4  161.8   0.3495   4.3 ------	UNKNOWN                       
206.6255  33.2856    0.8  27.7 -137.6   0.3224  14.2 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
58.988600 962.549900
1469.488000 1611.692200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5547  35.3496    4.5  39.2   84.8   7.0078   2.6    4.8	Her X-1                       
204.5508 -25.6312    2.9  59.0 -166.1  14.0825   4.1 ------	UNKNOWN                       
133.0755  53.3472    3.8  54.4  -33.1  10.1189   3.0 ------	UNKNOWN                       
Plot creation:
Sat May 30 12:45:11 EDT 2015