GRB 230201B
GCN Circular 33259
Subject
GRB 230201B: TURBO Optical Upper Limits
Date
2023-02-03T22:21:28Z (3 years ago)
From
Robert Strausbaugh at University of Minnesota <rstrausb@umn.edu>
R. Strausbaugh (UMN), D. Warshofsky (UMN), P. L. Kelly (UMN) report on
behalf of a larger collaboration:
We observed the GRB 230201B (Fermi GBM Team, GCN 33247) field with the
Total-Coverage Ultrafast Response to Binary-Mergers Observatory (TURBO)
prototype telescope in St. Paul, Minnesota on February 2, from 02:58 to
03:14 UT (corresponding to 7.03 to 7.30 hours after GRB trigger) in SDSS g
and r-band filters.
We acquired a series of 10x90s exposures in each band. We do not detect
any fading sources in the GBM error region in either band, consistent with
available optical upper limits (Lipunov et al., GCN 33249).
The following 3-sigma upper limits in AB magnitudes are calculated using
the Pan-STARRS catalog as reference:
g > 17.95
r > 17.84
These magnitudes are not corrected for foreground Galactic extinction.
The TURBO prototype in St. Paul consists of two co-mounted 11-inch
telescopes each with a 6.6 square degree field of view. TURBO will consist
of two arrays of 8 pairs of co-mounted 11-inch telescopes at two dark-sky
sites: Magdalena Ridge Observatory, New Mexico, USA and Skinakas
Observatory, Crete, Greece.
GCN Circular 33249
Subject
Fermi GRB 230201B: Global MASTER-Net observations report
Date
2023-02-02T09:45:19Z (3 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,
G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gres, N.M. Budnev
(Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov
(Blagoveschensk Educational State University)
MASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB 230201B ( Fermi GBM team, GCN 33247) errorbox 48850 sec after notice time and 48883 sec after trigger time at 2023-02-02 09:31:32 UT, with upper limit up to 16.6 mag. Observations started at twilight. The observations began at zenith distance = 36 deg. The sun altitude is -10.9 deg.
The galactic latitude b = -44 deg., longitude l = 143 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2196085
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
656 | 2023-02-01 20:06:43 | MASTER- | (01h 49m 58.81s , +16d 29m 53.9s) | C | 120 | 16.7 |
810 | 2023-02-01 20:09:03 | MASTER- | (01h 50m 03.58s , +16d 29m 05.6s) | C | 150 | 16.6 |
1007 | 2023-02-01 20:12:04 | MASTER- | (01h 49m 56.20s , +16d 28m 21.1s) | C | 180 | 16.7 |
1206 | 2023-02-01 20:15:24 | MASTER- | (01h 50m 01.17s , +16d 28m 39.3s) | C | 180 | 16.6 |
48914 | 2023-02-02 09:31:32 | MASTER-Amur | (01h 47m 36.09s , +16d 24m 48.5s) | C | 60 | 16.1 |
48993 | 2023-02-02 09:32:51 | MASTER-Amur | (01h 55m 52.14s , +16d 26m 10.9s) | C | 60 | 16.3 |
49232 | 2023-02-02 09:36:50 | MASTER-Amur | (01h 46m 34.64s , +14d 31m 51.4s) | C | 60 | 16.3 |
49312 | 2023-02-02 09:38:09 | MASTER-Amur | (01h 54m 45.72s , +14d 30m 46.2s) | C | 60 | 16.5 |
49393 | 2023-02-02 09:39:31 | MASTER-Amur | (01h 48m 40.42s , +18d 20m 14.0s) | C | 60 | 16.6 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 33247
Subject
GRB 230201B: Fermi GBM Final Real-time Localization
Date
2023-02-01T20:07:10Z (3 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 LONG GRB
At 19:56:48 UT on 1 Feb 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230201B (trigger 696974213.104426 / 230201831).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 27.4, Dec = 16.5 (J2000 degrees, equivalent to J2000 01h 49m, 16d 30'), with a statistical uncertainty of 2.2 degrees.
The angle from the Fermi LAT boresight is 49.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230201831/quicklook/glg_skymap_all_bn230201831.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/bn230201831/quicklook/glg_healpix_all_bn230201831.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230201831/quicklook/glg_lc_medres34_bn230201831.gif