GRB 220903, GRB 220903A
GCN Circular 32625
Subject
GRB 220930A: MITSuME Akeno optical upper limits
Date
2022-10-05T08:46:19Z (4 years ago)
Edited On
2025-12-12T18:16:15Z (5 months ago)
From
Tateda Mahiro at Tokyo Tech <tateda@hp.phys.titech.ac.jp>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>
M. Tateda, I.Takahashi, K. L. Murata, Y. Imai, N. Ito, M. Niwano, S.
Sato, N. Higuchi, Y. Takamatsu, R. Hosokawa, M. Sasada, Y. Yatsu, and
N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:We
observed the field of GRB 220930A (S. B. Cenko et al. GCN Circular
#32603, Alan M. Watson et al. GCN Circular #32604, The Swift-XRT team
GCN Circular #32605,, Y.-D. Hu et al. GCN Circular #32606, V. Lipunov
et al. GCN Circular #32607, P.A. Evans et al. GCN Circular #32608, A.
Belles et al. GCN Circular #32609, R. Strausbaugh et al. GCN Circular
#32610, V. D'Elia et al. GCN Circular #32611, S. D. Barthelmy et al.
GCN Circular #32612, R. Gopalakrishnan et al. GCN Circular #32613,
A.Ridnaia et al. GCN Circular #32614, N. Pankov et al. GCN Circular
#32617) with the optical three color (g', Rc, and Ic) CCD cameras
attached to the MITSuME 50 cm telescope Akeno.The observation with a
series of 60 sec exposures started at 2022-09-30 13:10:00 UT (118.1
minutes after the Swift/BAT trigger). We stacked the images with good
conditions. We did not detect any uncatalogued sources within the
enhanced Swift/XRT error region (Evans et al. GCN Circular #32608). We
obtained the 5-sigma limits of the stacked images as follows.T0+[days]
| MID-UT | T-EXP[sec] | 5-sigma limits
------------------------------------------------------------------------------------------------
0.23 | 2022-09-30 16:39:02.52 | 14460 | g'>21.0, Rc>20.9, Ic>20.4
------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure timeWe used PS1 catalog for flux calibration.
The magnitudes are expressed in the AB system. The images were
processed in real-time through the MITSuME GPU reduction pipeline
(Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24;
https://github.com/MNiwano/Eclaire)..
GCN Circular 32534
Subject
IPN triangulation of GRB 220903A (long)
Date
2022-09-08T15:45:14Z (4 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,
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,
E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
and
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT team, report:
The long-duration GRB 220903A
has been detected by Fermi (GBM trigger 683900183),
INTEGRAL (SPI-ACS), Konus-Wind, and Swift (BAT), so far,
at about 44178 s UT (12:16:18).
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:
178.795 (11h 55m 11s) -29.705 (-29d 42' 17")
Corners:
176.905 (11h 47m 37s) -30.818 (-30d 49' 04")
177.561 (11h 50m 15s) -31.150 (-31d 09' 02")
180.605 (12h 02m 25s) -28.545 (-28d 32' 44")
179.962 (11h 59m 51s) -28.232 (-28d 13' 54")
---------------------------------------------
The error box area is 2.32 sq. deg, and its maximum
dimension is 3.94 deg (the minimum one is 37.6 arcmin).
The Sun distance was 39 deg.
This box may be improved.
The IPN localization is consistent with, but reduces the area of,
the Fermi-GBM final localization (glg_healpix_all_bn220903511_v01).
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB220903_T44175/IPN/
The time history and spectrum will be given in forthcoming GCN Circulars.