TITLE:   GCN CIRCULAR
NUMBER:  32795
SUBJECT: GRB 221009A: GRANDMA observations
DATE:    22/10/18 15:32:46 GMT
FROM:    Sarah Antier at OCA  <sarah.antier@oca.eu>

Y. Rajabov, T. Sadibekova (UBAI), Y. Tillayev (UBAI, NUUz),
C. Rinner, Z. Benkhaldoun (OUCA), X. F. Wang (THU/BJP),
J. Zhu (BJP), X. Y. Zeng (CGTU), L. T. Wang, A. Iskandar (XAO),
A. M. Fouad, A. Takey A. Shokry, M. Soliman (NRIAG), P. Hello,
T. Hussenot (IJCLAB), M. Boer, A. de Ugarte Postigo, S. Antier (OCA/Artemis)
D. A. Kann (Goethe Univ.), E. Burns (LSU), A. Simon, A. Baransky
(Kyiv Univ), L. Abe, Ph. Bendjoya, J.-P. Rivet (Lagrange-OCA),
D. Vernet (Galilee-OCA), S. Brunier (KNC), R. Inasaridze, R. Natsvlishvili,
N. Kochiashvili (AbAO), S.Beradze, V. Aivazyan, G. Kapanadze, O.Burkhonov,
J. G. Ducoin (IAP), S.Ehgamberdiev (UBAI, NUUz), A. Klotz (OMP/IRAP),
I. Tosta e Melo (INFN-LNS) report on behalf of GRANDMA collaboration:

The GRANDMA telescope network responded to the alert of the ultra-bright
GRB 221009A (Swift detection: Dichiara et al., GCN 32632; Fermi
GBM detection: Veres et al., GCN 32636).

The first observations started 2.30 h after the Fermi/GBM trigger time
with TAROT-TRE without filter.

Below, we report select observations. We also report our 5-sigma upper
limits. Magnitudes are given in the AB system.

T-T0 (day)| MJD   | Obser.   |Exposure| Filter | Mag +/- err |Upp.Lim. (AB)
___________________________________________________________________________
1.069 |59862.622720|UBAI-ST| 6x180s |R-Bessel| 18.3  +/- 0.1 | 19.2
1.136 |59862.689664| KAO   | 11x100s| sdssr  | 18.57 +/- 0.05| 20.5
1.134 |59862.687523| KAO   | 2x120s | sdssg  | 20.43 +/- 0.2 | 19.8
1.154 |59862.707801| KAO   | 9x80s  | sdssi  | 17.56 +/- 0.05| 20.3
1.166 |59862.719039| KAO   | 2x120s | sdssz  | 16.93 +/- 0.05| 19.7
1.223 |59862.776151|Lisnyky| 10x30s |R-Bessel| 18.15 +/- 0.1 | 19.6
1.258 |59862.811817| MOSS  | 20x60s | clear  | 18.5  +/- 0.1 | 20.3
1.301 |59862.854179|C2PU-O | 2x300s | sdssr  | 18.96 +/- 0.1 | 20
3.027 |59864.580925| SNOVA | 10x150s| clear  |        -      | 19.7
3.047 |59864.600648|UBAI-ST| 5x240s |R-Bessel| 19.85  +/- 0.1| 19.3
4.191 |59865.743981| KAO   | 21x110s| sdssz  | 18.8   +/- 0.1| 19.7

These detections and limits are consistent with the detections and limits
previously reported in Lipunov et al., GCN 32634; Perley, GCN 32638;
Broens, GCN 32640; Hu et al., GCN 32644; Belkin et al., GCN 32645; GCN 32769
; Wet et al., GCN 32646; Xu et al., GCN 32647; de Ugarte Postigo et al., GCN
32648; Odeh, GCN 32649; GCN 32666; Brivio et al., GCN 32652; Kuin et al.,
GCN 32656; Paek et al., GCN 32659; Kumar et al., GCN 32662; Romanov, GCN
32664; 32679; Chen et al., GCN 32667; Vidal et al., GCN 32669; Kim et al.,
GCN 32670; Groot et al., GCN 32678; Castro-Tirado et al., GCN 32686;
Watson et al., GCN 32692; Strausbaugh et al. GCN 32693; Butler et al., GCN
32705; Vinko et al., GCN 32709; Mao et al., GCN 32727; Zaznobin et al.,
GCN 32729; Sasada et al., GCN 32730; Strausbaugh & Cucchiara, GCN 32738;
O'Connor et al., GCN 32739; GCN 32750; Bikmaev et al., GCN 32743; GCN
32752; Rastinejad & Fong, GCN 32749; Schneider et al., GCN 32753;
D’Avanzo et al., GCN 32755; Huber et al., GCN 32758; Shrestha et al.,
GCN 32759; 32771; Izzo et al., GCN 32765.

The observations were contaminated by the nearly full Moon.

Further analysis are ongoing in GRANDMA especially on
TAROT, ShAO-T60, AbAO-T70 and C2PU-O.

The KAO, UBAI-ST have been calibrated using nearby
stars from the Pan-STARRS catalog in sdss r, g, i and z, measured with
STDpipe (Karpov 2022). Lisnyky-AZT has been calibrated using field
stars from the PanSTARRS-DR1 catalog, measured with the MUPHOTEN pipeline
(Duverne et al. 2022). MOSS and SNOVA data have been calibrated with
Gaia DR2.

We advocate a joint multi-wavelength publication for this event and we are
happy to collaborate with teams that have the same spirit,
to be able to explore the best astrophysical scenario.

GRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr)
devoted to the observation of transients in the context of multi-messenger
astrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is
the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).