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GRB 190810A

GCN Circular 25310

Subject

GRB 190810A: Fermi GBM Final Real-time Localization

Date

2019-08-10T16:22:23Z (6 years ago)

From

Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>

The Fermi GBM team reports the detection of a likely SHORT GRB

At 16:12:01 UT on 10 Aug 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190810A (trigger 587146326.24257 / 190810675).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 192.8, Dec = -38.7 (J2000 degrees, equivalent to J2000 12h 51m, -38d 42'), with a statistical uncertainty of 17.0 degrees.

The angle from the Fermi LAT boresight is 115.0 degrees.

The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190810675/quicklook/glg_skymap_all_bn190810675.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190810675/quicklook/glg_healpix_all_bn190810675.fit

The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190810675/quicklook/glg_lc_medres34_bn190810675.gif

GCN Circular 25312

Subject

IPN triangulation of GRB 190810A (short)

Date

2019-08-11T19:27:19Z (6 years ago)

From

Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>

K. Hurley, on behalf of the IPN,

I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin,
on behalf of the HEND-Odyssey GRB team,

D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova,
and T. Cline on behalf of the Konus-Wind team,

A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM team,

A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo,
and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,

S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer,
on behalf of the Swift-BAT team, and

W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr,
on behalf of the GRS-Odyssey GRB team, report:

The short-duration GRB 190810A (The Fermi-GBM team, GCN 25310Loading...
 
 )
was detected by Fermi (GBM trigger 587146326), INTEGRAL (SPI-ACS),
Mars-Odyssey (HEND), Konus-Wind, and Swift (BAT),
at about 58321 s UT (16:12:01).
The burst was outside the coded field of view of the BAT.

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   192.049 (12h 48m 12s) -28.504 (-28d 30' 16")
  Corners:
   190.529 (12h 42m 07s) -30.184 (-30d 11' 02")
   193.578 (12h 54m 19s) -26.862 (-26d 51' 42")
   193.486 (12h 53m 57s) -26.776 (-26d 46' 34")
   190.437 (12h 41m 45s) -30.097 (-30d 05' 48")
  ---------------------------------------------
The error box area is about 1804 sq. arcmin, and its maximum
dimension is 4.28 deg (the minimum one is 7.0 arcmin).
The Sun distance was 66 deg.

This box may be improved.

The IPN localization is consistent with, but reduces the area of, the 
Fermi-GBM one.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB190810_T58321/IPN

The Konus-Wind time history and spectrum will be given in a forthcoming
GCN Circular.

GCN Circular 25313

Subject

Konus-Wind observation of GRB 190810A

Date

2019-08-12T11:39:06Z (6 years ago)

From

Anna Kozlova at Ioffe Institute <ann_kozlova@mail.ioffe.ru>

A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks,
M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline
on behalf of the Konus-Wind team, report:

The short-duration GRB 190810A
(IPN triangulation: Hurley et al., GCN 25312Loading...
 
 )
triggered Konus-Wind at T0=58318.421 s UT (16:11:58.421).

The burst light curve shows a single pulse
which starts at T0-0.1 s and has a total duration of ~0.2 s.

As observed by Konus-Wind, the burst
had a fluence of 2.29(-0.40,+0.85)x10^-6 erg/cm2,
and a 16-ms peak flux, measured from T0-0.042 s,
of 2.23(-0.55,+0.92)x10^-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).

Since the most intense part of the burst was detected before
the trigger, the spectral analysis was performed using
the KW 3-channel light curve data.

Modeling the KW 3-channel time-integrated spectrum
(from T0-0.098 s to T0+0.088 s)
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
yields alpha = -0.61 (-0.22,+0.27), and Ep = 1120 (-266,+656) keV.

The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB190810_T58321/

All the quoted errors are at the 68% confidence level.
All the quoted values are preliminary.