Gamma-ray Burst 140104B

(All information courtesy of the instrument teams.)

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 04 Jan 14 17:32:27 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     410549526
GRB_RA:          218.033d {+14h 32m 08s} (J2000),
                 218.232d {+14h 32m 56s} (current),
                 217.327d {+14h 29m 18s} (1950)
GRB_DEC:         -21.283d {-21d 16' 59"} (J2000),
                 -21.345d {-21d 20' 40"} (current),
                 -21.063d {-21d 03' 46"} (1950)
GRB_ERROR:       25.18 [deg radius, statistical plus systematic]
GRB_INTEN:       69 [cnts/sec]
DATA_SIGNIF:     4.70 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16661 TJD;     4 DOY;   14/01/04
GRB_TIME:        63123.15 SOD {17:32:03.15} UT
GRB_PHI:         252.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.69
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      94%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:       285.51d {+19h 02m 01s}  -22.67d {-22d 40' 16"}
SUN_DIST:         61.82 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      330.60d {+22h 02m 24s}   -7.11d {-07d 06' 25"}
MOON_DIST:       107.86 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      332.19, 35.80 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      222.44, -6.01 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 177.33,-25.37 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 04 Jan 14 17:32:39 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      66
TRIGGER_NUM:     410549526
GRB_RA:          222.417d {+14h 49m 40s} (J2000),
                 222.612d {+14h 50m 27s} (current),
                 221.721d {+14h 46m 53s} (1950)
GRB_DEC:         -16.550d {-16d 33' 00"} (J2000),
                 -16.607d {-16d 36' 26"} (current),
                 -16.343d {-16d 20' 35"} (1950)
GRB_ERROR:       14.53 [deg radius, statistical plus systematic]
GRB_INTEN:       91 [cnts/sec]
DATA_SIGNIF:     6.80 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16661 TJD;     4 DOY;   14/01/04
GRB_TIME:        63123.15 SOD {17:32:03.15} UT
GRB_PHI:         240.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.70
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:       285.51d {+19h 02m 01s}  -22.67d {-22d 40' 16"}
SUN_DIST:         59.13 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      330.60d {+22h 02m 25s}   -7.11d {-07d 06' 23"}
MOON_DIST:       104.97 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      339.66, 37.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      224.95, -0.24 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 177.33,-25.37 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 04 Jan 14 17:32:47 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      65
TRIGGER_NUM:     410549526
GRB_RA:          217.500d {+14h 30m 00s} (J2000),
                 217.697d {+14h 30m 47s} (current),
                 216.797d {+14h 27m 11s} (1950)
GRB_DEC:         -20.620d {-20d 37' 11"} (J2000),
                 -20.682d {-20d 40' 53"} (current),
                 -20.398d {-20d 23' 52"} (1950)
GRB_ERROR:       5.96 [deg radius, statistical only]
DATA_SIGNIF:     6.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16661 TJD;     4 DOY;   14/01/04
GRB_TIME:        63123.15 SOD {17:32:03.15} UT
GRB_PHI:         243.00 [deg]
GRB_THETA:        26.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       285.51d {+19h 02m 01s}  -22.67d {-22d 40' 16"}
SUN_DIST:         62.47 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      330.60d {+22h 02m 25s}   -7.11d {-07d 06' 21"}
MOON_DIST:       108.52 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      332.02, 36.62 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      221.75, -5.54 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 04 Jan 14 17:32:49 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      69
TRIGGER_NUM:     410549526
GRB_RA:          225.550d {+15h 02m 12s} (J2000),
                 225.739d {+15h 02m 57s} (current),
                 224.876d {+14h 59m 30s} (1950)
GRB_DEC:          -9.633d {-09d 37' 59"} (J2000),
                  -9.688d {-09d 41' 15"} (current),
                  -9.437d {-09d 26' 13"} (1950)
GRB_ERROR:       9.33 [deg radius, statistical plus systematic]
GRB_INTEN:       126 [cnts/sec]
DATA_SIGNIF:     12.70 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16661 TJD;     4 DOY;   14/01/04
GRB_TIME:        63123.15 SOD {17:32:03.15} UT
GRB_PHI:         220.00 [deg]
GRB_THETA:        15.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.62
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:       285.51d {+19h 02m 01s}  -22.67d {-22d 40' 16"}
SUN_DIST:         58.48 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:      330.60d {+22h 02m 25s}   -7.11d {-07d 06' 21"}
MOON_DIST:       103.31 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      348.21, 41.46 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      225.89,  7.26 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 177.33,-25.37 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 04 Jan 14 17:32:52 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      68
TRIGGER_NUM:     410549526
GRB_RA:          221.770d {+14h 47m 05s} (J2000),
                 221.960d {+14h 47m 50s} (current),
                 221.093d {+14h 44m 22s} (1950)
GRB_DEC:         -11.180d {-11d 10' 47"} (J2000),
                 -11.238d {-11d 14' 16"} (current),
                 -10.971d {-10d 58' 16"} (1950)
GRB_ERROR:       3.21 [deg radius, statistical only]
DATA_SIGNIF:     13.00 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16661 TJD;     4 DOY;   14/01/04
GRB_TIME:        63123.15 SOD {17:32:03.15} UT
GRB_PHI:         222.00 [deg]
GRB_THETA:        19.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       285.51d {+19h 02m 01s}  -22.67d {-22d 40' 16"}
SUN_DIST:         61.43 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      330.61d {+22h 02m 25s}   -7.11d {-07d 06' 20"}
MOON_DIST:       106.68 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      342.99, 42.52 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      222.76,  4.71 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 04 Jan 14 17:32:43 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     410549526
GRB_RA:          218.610d {+14h 34m 26s} (J2000),
                 218.798d {+14h 35m 12s} (current),
                 217.939d {+14h 31m 45s} (1950)
GRB_DEC:         -10.050d {-10d 03' 00"} (J2000),
                 -10.111d {-10d 06' 38"} (current),
                  -9.831d {-09d 49' 52"} (1950)
GRB_ERROR:       111.30 [deg radius, statistical only]
DATA_SIGNIF:     4.90 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16661 TJD;     4 DOY;   14/01/04
GRB_TIME:        63123.15 SOD {17:32:03.15} UT
GRB_PHI:         225.00 [deg]
GRB_THETA:        19.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       285.51d {+19h 02m 01s}  -22.67d {-22d 40' 16"}
SUN_DIST:         64.73 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      330.60d {+22h 02m 25s}   -7.11d {-07d 06' 22"}
MOON_DIST:       109.95 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      340.32, 45.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      219.45,  4.84 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN Circular #15684
G. Vianello (Stanford University), J. McEnery (NASA/GSFC), and E. Sonbas (Adiyaman Univ.), report on behalf of the Fermi-LAT team:
Starting at 17:32:03.15 on Jan. 4, 2014, Fermi LAT detected high energy emission from GRB 140104B, which was also detected by Fermi-GBM (trigger 410549526).
The best LAT on-ground location is found to be R.A., Dec 218.81, -8.90 deg (J2000) with an error radius of 0.22 deg (90% containment, statistical error only), which was 25 deg from the LAT boresight at the time of the trigger.
The data from the Fermi LAT show a significant increase in the event rate within 10 deg of the GBM location after the GBM trigger that is spatially and temporally correlated with the GBM emission with high significance. The highest-energy photon is a 1.8 GeV event which is observed ~800 seconds after the GBM trigger.
A Swift ToO has been requested for this burst.
The Fermi LAT point of contact for this burst is Eda Sonbas (edasonbas@yahoo.com).
The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN Circular #15687
Shaolin Xiong (UAH) reports on behalf of the Fermi GBM Team:
"At 17:32:03.15 UT on 04 January 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140104B (trigger 410549526 / 140104731), which was also detected by the ground analysis of Fermi/LAT (Vianello et al. 2014, GCN 15684) The GBM on-ground location is consistent with the LAT position.
The GBM light curve consists of multiple pulses with a duration (T90) of about 190 s (50-300 keV). The time-averaged spectrum from T0 to T0+200 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.23 +/- 0.06 and the cutoff energy, parameterized as Epeak, is 280 +/- 40 keV.
The event fluence (10-1000 keV) in this time interval is (3.2 +/- 0.2)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+190.7 s in the 10-1000 keV band is 5.7 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #15691
Dirk Grupe (Swift MOC, PSU) reports on behalf of the Swift team:
We report on the Swift observations of the field of the Fermi GBM and LAT detected GRB 140104B (Xiong, GCN Circ. 15687, G. Vianello GCN Circ. 15684, respectively). Swift started observing the field of GRB 140104B at 2014-January-05 08:55, 15.5 hours after the GBM trigger for a total of 4073s. The XRT field covered the inner part of the GBM error circle reported by Xiong. We found four faint X-ray sources in the XRT. The first source is a star already present in the DSS, the other three sources are know sources: the star TYC 5564-19-1, the AGN HE 1432-0838, and the starburst galaxy IRAS F14325-0837. No other X-ray source was found. The 3-sigma upper limit at the center of the field is 1.4e-3 counts s^-1.
This report is an official product of the Swift team.
GCN Circular #15722
W. Iwakiri (RIKEN), M. Tashiro, Y. Terada, T. Yasuda, Y. Ishida, H. Ueno, S. Sugimoto (Saitama U.), M. Yamauchi, N. Ohmori, M. Akiyama, R. Kinoshita (Univ. of Miyazaki), M. Ohno, K. Takaki, T. Kawano, R. Nakamura, S. Furui, Y. Fukazawa (Hiroshima U.), K. Yamaoka (Nagoya U.), S. Sugita (Ehime U.), Y. E. Nakagawa, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. Hanabata (ICRR), Y. Urata (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo) on behalf of the Suzaku WAM team, report:
The long GRB 140104B (Fermi-LAT detection: Vianello et al., GCN 15684; Fermi-GBM observation: Xiong, GCN 15687) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 17:32:13.926 UT (=T0).
The observed light curve shows a multi-peaked structure starting at T0-14 s, ending at T0+200 s with a duration (T90) of about 185 seconds. The fluence in 100 - 1000 keV was 1.86 (+0.83/-0.77) x 10^-5 erg/cm^2. The 1-s peak flux measured from T0+179 s was 1.34 (+0.52/-0.45) photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-14 s to T0+200 s is well fitted by a power-law with exponential cutoff model:
```
dN/dE ~ E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
alpha 0.42 (+1.17/-1.78), and
Epeak 351 (+75/-102) keV (chi^2/d.o.f. = 12.5/14).
```
All the quoted errors are at statistical 90% confidence level.
The light curves for this burst are available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
GCN Circular #15734
Dirk Grupe (Swift MOC, PSU) and Phil Evans (U Leicester) report on behalf of the Swift team:
We report on further Swift XRT observations of the field of the Fermi GBM and LAT detected GRB 140104B (Xiong, GCN Circ. 15687, G. Vianello GCN Circ. 15684, respectively). We detected an uncatalogued X-ray source in the first Swift observation of the field of GRB 140104B starting at 15.5 hours after the Fermi trigger (Grupe, GCN circ 15691) at
```
Ra-2000  =  14 35 01.0
Dec-2000 = -09 01 40.7
```
with an uncertainty of 4.0". The XRT count rate of this source was (8.1+/-1.6)e-3 counts s^-1. Note that we misidentified this source in the previous circular (15691) with the star TYC 5564-19-1, which however, is 2.2' away from this X-ray position.
We re-observed this source on 2014-01-14 for 4.6 ks again with Swift (9.5 days after the trigger). We do not detect this source in the XRT any more, suggesting that this may be the X-ray afterglow of GRB 140104B. The 3sigma upper limit at the position of this source is 1.3e-3 counts s^-1. Note, however, that this is not conclusive. This source can still be a highly variable background AGN (see e.g. Grupe et al. 2010, ApJS, 187, 64).
If this source is the X-ray afterglow of GRB 140104B, the X-ray spectrum appears to be rather soft. A spectral analysis of the X-ray data shows that the X-ray photon index is Gamma = 2.7+/-0.68 which is rather steep (see Grupe et al. 2013, ApJS,
```
209, 20; Evans et al., 2009, MNRAS, 397, 1177). 
The absorption column density is consistent with the
```
Galactic value (5.63e20 cm^-2). This steep X-ray spectral index and the steep energy spectral index and the high fluence in the 10-1000 keV band of the burst reported by Xiong (GCN circular 15687) suggests a low redshift nature of the burst (see Grupe et al. 2013, ApJ, 209, 20).
However, the steep X-ray photon index of Gamma = 2.7 does not exclude a possible AGN nature of the source. In a matter of fact, if this is a background AGN then the steep X-ray spectrum suggest that this is most-likely a Narrow Line Seyfert 1 galaxy. This is also the type of AGN with the strongest X-ray variability (e.g. Boller et al. 1996, Leighly 1999, Grupe et al. 2010).
This report is an official product of the Swift team.

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Jochen Greiner, last update: 14-Jan-2014 [Disclaimer]