TITLE:   GCN CIRCULAR
NUMBER:  34046
SUBJECT: IPN triangulation of GRB 230616A (short)
DATE:    23/06/21 09:19:52 GMT
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 MGNS/BepiColombo and HEND/Mars Odyssey teams,

J. Benkhoff on behalf of the BepiColombo team,

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

E. Burns on behalf of the IPN,

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

S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT 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 230616A
(Swift-BAT/GUANO detection: Tohuvavohu et al., GCN Circ. 33982;
AstroSat-CZTI detection: Waratkar et al., GCN Circ. 33983)
was detected by Swift (BAT), Konus-Wind, INTEGRAL (SPI-ACS),
AstroSat (CZTI), Mars-Odyssey (HEND), and BepiColombo (MGNS)
at about 74278 s UT (20:37:58).
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:
  192.035 (12h 48m 08s)  +5.683 ( +5d 40' 57")
 Corners:
  192.022 (12h 48m 05s)  +5.663 ( +5d 39' 46")
  192.049 (12h 48m 12s)  +5.714 ( +5d 42' 49")
  192.048 (12h 48m 12s)  +5.702 ( +5d 42' 08")
  192.022 (12h 48m 05s)  +5.652 ( +5d 39' 06")
 ---------------------------------------------
The error box area is 0.9 sq. arcmin, and its maximum
dimension is 4 arcmin (the minimum one is 0.3 arcmin).
The Sun distance was 103 deg.

This box may be improved.

The Swift-XRT sources (D'Avanzo et al., GCN Circ. 34006)
are outside the IPN box.
There are no obvious catalogued host galaxies
(from GLADE+ catalog; Dalya et al., MNRAS 514, 1, 1403, 2022)
inside the box.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB230616_T74278/IPN

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