Click here for the BAT GCN circular template
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
301.7545 -62.5736 0.0142 44.7677 177.6964 1.2740764 13.512 TRIG_00323898
Foreground time interval of the image:
-0.728 25.221 (delta_t = 25.949 [sec])
Background time interval of the image:
-239.480 -0.728 (delta_t = 238.752 [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 2.048000
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 2.048000
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 2.048000
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 -0.728 sec. to 149.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65476 ( -0.142114 0.144024 )
Norm@50keV : 1.29328E-03 ( -0.000107045 0.000106193 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.31 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 57 degrees of freedom
# Null hypothesis probability = 2.930122e-01
Photon flux (15-150 keV) in 150.4 sec: 0.169136 ( -0.0136368 0.0136712 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80815e-06 ( -1.58334e-07 1.59567e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.728 sec. to 149.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58072 ( -0.550819 0.762885 )
Epeak [keV] : 277.099 ( -277.1 -277.1 )
Norm@50keV : 1.41226E-03 ( -0.000804601 0.00125906 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.25 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 56 degrees of freedom
# Null hypothesis probability = 2.636366e-01
Photon flux (15-150 keV) in 150.4 sec: 0.168498 ( -0.014256 0.01409 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79814e-06 ( -1.75622e-07 1.68162e-07 ) ergs/cm2
Band function
Time interval is from -0.728 sec. to 149.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.20489 ( 1.21692 1.21692 )
beta : -1.73190 ( 1.73075 0.212132 )
Epeak [keV] : 64.6616 ( -66.1444 -66.1444 )
Norm@50keV : 2.42392E-03 ( -0.00109944 324.2 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.09 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 55 degrees of freedom
# Null hypothesis probability = 2.383125e-01
Photon flux (15-150 keV) in 150.4 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] : 13.3549 (-1.41524 1.63431)
R^2/D10^2 : 2.72805E-02 (-0.00930163 0.0138063)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 109.08 using 59 PHA bins.
# Reduced chi-squared = 1.9136 for 57 degrees of freedom
# Null hypothesis probability = 4.030902e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.551e-07 2.279e-08
25- 50 5.497e-07 5.587e-08
50-150 6.294e-07 1.131e-07
15-150 1.334e-06 1.290e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 160.261 (-52.5295 -159.632)
Norm : 0.689739 (-0.060106 0.0751662)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.15 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 57 degrees of freedom
# Null hypothesis probability = 2.680744e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.648e-07 3.158e-08
25- 50 4.955e-07 1.190e-07
50-150 1.005e-06 4.957e-07
15-150 1.765e-06 6.025e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.09796 (-1.48154 1.56026)
R1^2/D10^2 : 0.191744 (-0.0939548 0.248876)
kT2 [keV] : 28.3557 (-6.67632 13.2198)
R2^2/D10^2 : 1.43617E-03 (-0.00101865 0.00239175)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.63 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 55 degrees of freedom
# Null hypothesis probability = 2.238832e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.649e-07 8.408e-08
25- 50 5.023e-07 1.268e-07
50-150 1.039e-06 5.185e-07
15-150 1.806e-06 6.142e-07
Peak spectrum fit
Power-law model
Time interval is from 2.456 sec. to 3.456 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43876 ( -0.289103 0.29177 )
Norm@50keV : 1.31756E-02 ( -0.00208904 0.00208491 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.45 using 59 PHA bins.
# Reduced chi-squared = 1.271 for 57 degrees of freedom
# Null hypothesis probability = 8.147226e-02
Photon flux (15-150 keV) in 1 sec: 1.61923 ( -0.273398 0.275078 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26346e-07 ( -2.14145e-08 2.15238e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.456 sec. to 3.456 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.45455 ( )
Epeak [keV] : 155.661 ( )
Norm@50keV : 3.57589E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.54 using 59 PHA bins.
# Reduced chi-squared = 1.277 for 56 degrees of freedom
# Null hypothesis probability = 7.889205e-02
Photon flux (15-150 keV) in 1 sec: 1.61924 ( -0.27383 0.26813 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26238e-07 ( -2.1242e-08 2.1494e-08 ) ergs/cm2
Band function
Time interval is from 2.456 sec. to 3.456 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.20264 ( 1.20264 1.20264 )
beta : -1.43870 ( -0.291227 0.289566 )
Epeak [keV] : 23.7512 ( -23.7512 -23.7512 )
Norm@50keV : 2.65091E-02 ( -0.0154119 0.175127 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.45 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 55 degrees of freedom
# Null hypothesis probability = 5.739662e-02
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] : 18.3517 (-3.66004 4.79593)
R^2/D10^2 : 9.11543E-02 (-0.0498288 0.105285)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.84 using 59 PHA bins.
# Reduced chi-squared = 1.488 for 57 degrees of freedom
# Null hypothesis probability = 9.803405e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.108e-09 2.041e-09
25- 50 2.865e-08 8.835e-09
50-150 7.039e-08 2.148e-08
15-150 1.051e-07 2.733e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.70873 (-1.06727 1.06712)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.78 using 59 PHA bins.
# Reduced chi-squared = 1.294 for 57 degrees of freedom
# Null hypothesis probability = 6.670584e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.671e-08 9.805e-09
25- 50 3.215e-08 1.812e-08
50-150 7.051e-08 3.972e-08
15-150 1.194e-07 6.725e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.81089 (-4.12787 4.51634)
R1^2/D10^2 : 7.00107 (-6.00208 -6.47431)
kT2 [keV] : 25.1894 (-7.22287 26.8802)
R2^2/D10^2 : 2.78300E-02 (-0.0240989 0.048256)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.15 using 59 PHA bins.
# Reduced chi-squared = 1.330 for 55 degrees of freedom
# Null hypothesis probability = 5.130552e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.761e-08 1.020e-08
25- 50 2.603e-08 1.197e-08
50-150 8.207e-08 4.746e-08
15-150 1.257e-07 5.395e-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: 1.57278 ( -0.204091 0.205566 )
Norm@50keV : 3.23419E-03 ( -0.000377935 0.000376387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.06 using 59 PHA bins.
# Reduced chi-squared = 0.9484 for 57 degrees of freedom
# Null hypothesis probability = 5.860399e-01
Photon flux (15-150 keV) in 25.95 sec: 0.412181 ( -0.0499236 0.0501842 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.87624e-07 ( -9.75954e-08 9.81883e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55975 ( -0.806922 1.04463 )
Epeak [keV] : 9649.46 ( -8888.54 -8888.54 )
Norm@50keV : 3.24641E-03 ( -0.00217131 0.00478376 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.07 using 59 PHA bins.
# Reduced chi-squared = 0.9655 for 56 degrees of freedom
# Null hypothesis probability = 5.483305e-01
Photon flux (15-150 keV) in 25.95 sec: 0.411413 ( -0.051251 0.050676 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.8923e-07 ( -1.06055e-07 9.63757e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.79241 ( -4.79241 -4.79241 )
beta : -1.61616 ( -0.230837 0.218928 )
Epeak [keV] : 21.9850 ( -21.985 7.49112 )
Norm@50keV : 555.884 ( -63.6692 2.04792e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.61 using 59 PHA bins.
# Reduced chi-squared = 0.9747 for 55 degrees of freedom
# Null hypothesis probability = 5.278609e-01
Photon flux (15-150 keV) in 25.95 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) = 4.80e-07
S(50-100 keV) = 6.10e-07
T90 vs. Hardness ratio plot
T90 = 120.936000019312 sec.
Hardness ratio (energy fluence ratio) = 1.27083
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.2306
Count Ratio (50-100 keV) / (15-25 keV) = 0.85566
Mask shadow pattern
IMX = -9.911229326485734E-01, IMY = -3.986939987938913E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-239.480000 -0.728000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9680 -15.6343 1.1 40.8 -85.4 7.7834 10.0 0.8 Sco X-1
255.9934 -37.8500 0.5 33.5 -124.4 6.7367 24.8 0.5 4U 1700-377
256.5336 -36.4341 8.9 32.5 -122.3 0.3557 1.3 4.8 GX 349+2
262.8457 -24.6985 15.0 23.7 -101.8 0.1683 0.8 9.3 GX 1+4
264.6071 -44.5766 7.7 32.1 -141.5 0.3053 1.5 9.6 4U 1735-44
268.3421 -1.3863 2.0 25.8 -42.7 1.0745 5.8 4.3 SW J1753.5-0127
270.3794 -25.1720 4.8 17.2 -107.7 0.4185 2.4 7.6 GX 5-1
270.3382 -25.8853 7.7 17.5 -109.9 0.2587 1.5 8.7 GRS 1758-258
274.1365 -14.1751 4.4 13.8 -65.3 0.4569 2.6 11.3 GX 17+2
275.8198 -30.2327 2.3 15.6 -131.9 0.7965 5.0 9.7 H1820-303
284.8704 -24.9192 6.1 6.6 -150.3 0.3193 1.9 9.0 HT1900.1-2455
288.8009 10.9456 0.7 29.8 9.1 3.6656 17.1 0.2 GRS 1915+105
262.9868 -33.8367 2.2 26.6 -122.3 1.0982 5.2 0.2 GX 354-0
294.1953 10.7979 3.3 30.4 19.6 0.7387 3.5 ------ UNKNOWN
293.2212 14.7006 2.4 34.0 16.5 1.0517 4.9 ------ UNKNOWN
264.2293 26.6995 2.0 50.9 -20.4 2.4681 5.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.728000 25.220590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8088 -15.7399 0.0 41.0 -85.6 -0.3345 -1.6 11.5 Sco X-1
255.9792 -37.8291 15.6 33.5 -124.3 0.0600 0.7 1.0 4U 1700-377
256.4517 -36.4233 5.3 32.5 -122.3 0.1767 2.2 0.8 GX 349+2
262.8435 -24.7725 174.0 23.8 -102.0 0.0042 0.1 9.2 GX 1+4
264.5532 -44.3824 6.5 32.0 -141.1 -0.1103 -1.8 9.1 4U 1735-44
268.4504 -1.3956 7.3 25.7 -42.5 0.0912 1.6 6.0 SW J1753.5-0127
270.2557 -25.0926 6.5 17.3 -107.3 -0.0954 -1.8 1.7 GX 5-1
270.1981 -25.8598 3.9 17.6 -109.7 -0.1626 -3.0 9.0 GRS 1758-258
273.9164 -13.8953 4.7 14.1 -64.5 -0.1341 -2.4 9.9 GX 17+2
276.0870 -30.2178 0.0 15.5 -132.5 0.0267 0.5 12.3 H1820-303
284.8840 -25.0376 9.6 6.7 -150.8 -0.0583 -1.2 10.8 HT1900.1-2455
288.8525 11.0167 4.0 29.9 9.1 -0.1686 -2.9 5.3 GRS 1915+105
262.8113 -33.9038 8.8 26.7 -122.3 -0.0814 -1.3 9.8 GX 354-0
322.1499 2.3262 2.5 40.0 68.5 0.8311 4.6 ------ UNKNOWN
301.7545 -62.5737 0.9 44.8 177.7 1.2739 13.5 ------ UNKNOWN
281.6138 -68.9887 1.9 50.3 -170.3 0.6779 6.1 ------ UNKNOWN
264.9394 31.3239 2.0 54.7 -17.0 0.9438 5.7 ------ UNKNOWN
241.6019 -35.7443 1.9 43.8 -115.5 1.2984 6.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
92.020600 779.120600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.9934 -37.8415 0.4 37.0 -28.6 13.4808 29.0 0.4 4U 1700-377
256.5913 -36.4124 10.2 37.9 -26.7 0.5562 1.1 7.6 GX 349+2
263.0266 -24.8286 5.3 45.6 -11.2 1.3499 2.2 5.1 GX 1+4
264.9265 -44.5593 9.0 27.7 -25.5 0.4392 1.3 10.2 4U 1735-44
270.3090 -25.2299 33.5 42.8 -2.6 0.2111 0.3 9.1 GX 5-1
270.1926 -25.7724 2.6 42.3 -3.1 2.6124 4.4 6.2 GRS 1758-258
273.8943 -14.0264 7.8 52.4 6.5 1.5320 1.5 6.5 GX 17+2
275.8603 -30.3675 2.1 36.2 1.8 2.4760 5.4 3.3 H1820-303
285.0613 -24.8943 3.6 39.3 17.1 1.6140 3.2 2.1 HT1900.1-2455
262.9691 -33.8509 1.9 37.5 -17.2 2.7834 6.1 1.4 GX 354-0
283.8035 -30.3357 3.0 34.2 13.2 1.5251 3.8 ------ UNKNOWN
283.4629 -66.5727 2.7 8.8 -83.9 1.4837 4.3 ------ UNKNOWN
Plot creation:
Sun May 31 06:33:33 EDT 2015