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GRB 230116B

GCN Circular 33172

Subject

GRB 230116B: Fermi GBM Final Real-time Localization

Date

2023-01-16T09:09:37Z (2 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 08:59:06 UT on 16 Jan 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230116B (trigger 695552351.674084 / 230116374).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 113.6, Dec = -40.4 (J2000 degrees, equivalent to J2000 07h 34m, -40d 23'), with a statistical uncertainty of 2.1 degrees.

The angle from the Fermi LAT boresight is 102.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230116374/quicklook/glg_skymap_all_bn230116374.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230116374/quicklook/glg_healpix_all_bn230116374.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230116374/quicklook/glg_lc_medres34_bn230116374.gif

GCN Circular 33200

Subject

IPN triangulation of GRB 230116B (short)

Date

2023-01-20T17:53:22Z (2 years ago)

From

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

A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the HEND/Mars Odyssey team,

D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,
and T. Cline on behalf of the Konus-Wind team,

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

E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,

and

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

The bright, short-duration GRB 230116B
(Fermi-GBM detection: the Fermi GBM team, GCN Circ. 33172Loading...
 
 )
has been detected by Fermi(GBM trigger 695552351),
Konus-Wind, INTEGRAL (SPI-ACS), and Mars-Odyssey (HEND), so far,
at about 32347 s UT (08:59:07).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   115.533 (07h 42m 08s) -43.027 (-43d 01' 39")
  Corners:
   115.712 (07h 42m 51s) -42.983 (-42d 58' 59")
   115.582 (07h 42m 20s) -43.076 (-43d 04' 34")
   115.353 (07h 41m 25s) -43.071 (-43d 04' 17")
   115.483 (07h 41m 56s) -42.979 (-42d 58' 44")
  ---------------------------------------------
The error box area is 58 sq. arcmin, and its maximum
dimension is 17 arcmin (the minimum one is 5.8 arcmin).
The Sun distance was 116 deg.

This box may be improved.

The IPN localization is consistent with, but reduces the area of,
the Fermi-GBM final localization (GCN 33172Loading...
 
 ).

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB230116_T32349/IPN

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

GCN Circular 33203

Subject

GRB 230116B: Fermi GBM observation

Date

2023-01-21T17:53:00Z (2 years ago)

From

Rachel Hamburg at UAH <rkh0007@uah.edu>

R. Hamburg (CNRS/IJCLab) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:

"At 08:59:06.67 UT on 16 January 2023, the Fermi Gamma-Ray Burst Monitor
(GBM)
triggered and located GRB 230116B (trigger 695552351 / 230116374), which
was
also localized by the IPN network (Kozyrev et al. 2023, GCN 33200Loading...
 
 ).
The GBM on-ground location is consistent with the IPN position.

The angle from the Fermi LAT boresight at the GBM trigger time is 104
degrees.

The GBM light curve consists of a single pulse with a duration (T90) of
about 64 ms (50-300 keV). The time-averaged spectrum from T0-0.064 s to
T0+0.128 is best fit by a power law function with an exponential
high-energy cutoff.  The power law index is -0.07 +/- 0.09 and
the cutoff energy, parameterized as Epeak, is 733 +/- 53 keV.

The event fluence (10-1000 keV) in this time interval is
(3.7 +/- 0.1)E-06 erg/cm^2. The 64-ms peak photon flux measured
starting from T0+0.0 s in the 10-1000 keV band is 75.5 +/- 3.0 ph/s/cm^2.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html

For Fermi GBM data and info, please visit the official Fermi GBM Support
Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"