GRB 140619B
GCN Circular 16419
Subject
GRB 140619B: Fermi GBM detection of a short GRB
Date
2014-06-20T00:40:16Z (11 years ago)
From
Valerie Connaughton at UAH/NSSTC <valerie.connaughton@nasa.gov>
V. Connaughton, B-B. Zhang (UAH), G. Fitzpatrick, and O. Roberts (UCD)
report on behalf of the Fermi GBM Team:
"At 11:24:40.52 UT on 19 June 2014, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 140619B (trigger 424869883 / 140619475)
The on-ground calculated location, using the GBM trigger
data, is RA = 133.4, DEC = -3.7 (J2000 degrees,
equivalent to 08h 54m, -3d 42'), with an uncertainty
of 5 degrees (radius, 1-sigma containment,
statistical only; there is additionally a systematic
error which is currently estimated to be 2 to 3 degrees).
The GBM light curve consists of a single peak with substructure,
with a duration (T90) of about 0.5 s (50-300 keV).
The time-averaged spectrum from T0-0.192 s to T0+0.640 s is
well fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.11 +/- 0.16 and
the cutoff energy, parameterized as Epeak, is 1450 +/- 220 keV
The event fluence (10-1000 keV) in this time interval is
(1.70 +/- 0.09)E-6 erg/cm^2. The 64-msec peak photon flux measured
starting from T0+0.38 s in the 10-1000 keV band is 7.6 +/- 3.4 ph/s/cm^2.
A Band function fits the spectrum equally well
with Epeak= 1356 +/- 252 keV, alpha = -0.06 +/- 0.19
and beta = 3.3 +/- 1.4.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
GCN Circular 16420
Subject
GRB 140619B: Fermi-LAT Detection
Date
2014-06-20T01:02:03Z (11 years ago)
From
Daniel Kocevski at SLAC <dankocevski@gmail.com>
GRB 140619B: Fermi-LAT detection
D. Kocevski (NASA/GSFC), F. Longo (University and INFN Trieste), G. Vianello (Stanford University), V. Connaughton (University of Alabama, Huntsville), J. McEnery (NASA/GSFC) and E.Sonbas (Adiyaman Univ.) report on behalf of the Fermi-LAT team:
At UT 11:24:47 on June 19, 2014, Fermi-LAT detected high-energy emission from GRB 140619B, which was also detected by Fermi-GBM (trigger 424869883 / 140619475). A preliminary analysis of GBM data characterizes this event as a short hard burst, with a T90 duration of ~0.5s (GCN 16419).
The best LAT on-ground location is found to be:
(RA, Dec) = 132.68, -9.66 (deg, J2000)
with an approximate error radius of 0.06 deg (90% containment, statistical error only).
This was 32 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 ~3 degree of the GBM location after the GBM trigger that is spatially and temporally correlated with the GBM emission with high significance. More than 19 photons above 100 MeV and more than 5 photons above 1 GeV are observed within 5 seconds. The highest-energy photon is a 24 GeV event which is observed 0.61 seconds after the GBM trigger.
The Fermi-LAT point of contact for this burst is Eda Sonbas edasonbas@yahoo.com.
A Swift ToO has been requested for this burst.
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 16424
Subject
GRB 140619B: Swift-XRT observations
Date
2014-06-20T16:16:03Z (11 years ago)
From
Alessandro Maselli at INAF/IASF Palermo <maselli@ifc.inaf.it>
A. Maselli (INAF-IASFPA) and P. D'Avanzo (INAF-OAB) report on behalf of
the Swift-XRT team:
"We have analysed 3.9 ks of XRT data for the Fermi/GBM and LAT-detected
short GRB 140619B (Connaughton et al., GCN Circ. 16419; Kocevski et al.,
GCN Circ. 16420), from 48.7 ks to 71.6 ks after the GBM trigger. The
data are entirely in Photon Counting (PC) mode. No bright X-ray
afterglow is detected within the LAT error circle. The three sigma upper
limit is 2.9E-03 cts/s.
This circular is an official product of the Swift-XRT team."
GCN Circular 16457
Subject
GRB 140619B: Suzaku WAM observation of the prompt emission
Date
2014-06-26T02:16:41Z (11 years ago)
From
Masanori Ohno at Hiroshima U <ohno@hep01.hepl.hiroshima-u.ac.jp>
W. Iwakiri(RIKEN), M. Tashiro, Y. Terada, T. Yasuda, S. Koyama, S. Takeda,
T. Nagayoshi, J. Enomoto, S. Nakaya, T. Fujinuma, S. Matsuoka (Saitama U.),
M. Yamauchi, N. Ohmori, R. Kinoshita (Univ. of Miyazaki),
M. Ohno, T. Kawano, S. Furui, Y. Fukazawa(Hiroshima U.),
K. Yamaoka (Nagoya U.), S. Sugita (Ehime U.),
Y. Hanabata (ICRR), Y. E. Nakagawa, M. Kokubun, T. Takahashi (ISAS/JAXA),
Y. Urata (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo)
on behalf of the Suzaku WAM team, report:
The short GRB 140619B (Fermi-GBM detection : Connaughton et al, GCN
16419; Fermi-LAT detection: Kocevski et al., GCN 16420) triggered the
Suzaku Wide-band All-sky Monitor (WAM) which covers an
energy range of 50 keV - 5 MeV at 11:24:40.128 UT (=T0).
The observed light curve shows a single peak, lasting from T0 to T0+1 s
with a duration
(T90) of about 0.7 seconds. The fluence in 100 - 1000 keV was 1.50
(+0.07, -0.22) x10^-6 erg/cm^2.
The 1-s peak flux measured from T0 was 2.29 (+0.19, -0.53)
photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0 to T0+1
s is well fitted by a power-law with exponential cutoff model:
dN/dE ~ E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
alpha 0.45 (+0.31, -0.37), and
Epeak 1418 (+292, -239) keV (chi^2/d.o.f. = 23.78/29).
All the quoted errors are at statistical 90% confidence level, in which
the systematic uncertainties are not included.
The light curves with 1-sec time resolution for this burst will be
appeared at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html
GCN Circular 16466
Subject
GRB 140619B: Magellan near-infrared observations
Date
2014-06-27T21:33:59Z (11 years ago)
From
Wen-fai Fong at CFA <wfong@cfa.harvard.edu>
W. Fong (Harvard), A. Monson (OCIW), M. Bayliss (Harvard), A. Stark
(Harvard), E. Berger (Harvard), B. Stalder (Harvard), and M. Florian (U.
Chicago) report:
"We observed the location of the short-duration GRB 140619B, detected by
Fermi/GBM (Connaughton et al., GCN 16419), Fermi/LAT (Kocevski et al., GCN
16420), and Suzaku/WAM (Iwakiri et al., GCN 16457) with the FourStar
Infrared Camera mounted on the Magellan/Baade 6.5-m telescope to cover the
Fermi/LAT position (90% containment; Kocevski et al., GCN 16420). We
obtained 770 sec of J-band observations on 2014 Jun 20.96 UT (1.48 days
post-burst). To check for the presence of a fading near-infrared source, we
re-observed the field (2300 sec) on 2014 Jun 21.97 UT, 2.49 days post-burst
and 1.01 days after the first set of observations.
Digital image subtraction of the two epochs using the ISIS software package
reveals no residuals in or around the Fermi/LAT position. We therefore
place a 3-sigma limit of J>22.9 AB mag on the brightness of the
near-infrared afterglow of GRB 140619B at 1.48 days after the burst."