TITLE:   GCN CIRCULAR
NUMBER:  31785
SUBJECT: GRB 220319A: GRANDMA observations
DATE:    22/03/24 14:29:52 GMT
FROM:    Marie Anne Bizouard at ARTEMIS/CNRS  <marieanne.bizouard@oca.eu>

M. Bizouard (OCA/Artemis), P-A. Duverne (IJCLAB), A. Iskandar (XAO),
D. Datashvili (AbAO), M. Blazek (FZU), D. Turpin (CEA), T. Midavaine (KNC)
S. Antier (OCA/Artemis), I. Tosta eMelo (INFN-LNS), X. F. Wang (TSU/BJP),
J. Zhu (BJP), X. Song (BJP), S. Karpov (FZU), A. Kann (IAA-CSIC),
D. Marchais (KNC), A. Popowicz (KNC), A. Oksanen (KNC), M. Serrau (KNC),
M. Freeberg (KNC),  A. Klotz (IRAP-OMP), R. Kneip (KNC), E. Broens (KNC),
O. Aguerre (KNC), report  on behalf of the GRANDMA collaboration:


The GRANDMA telescope network responded to the alert of GRB 220319A 
(Page et al.
GCN 31769). The first observations started 14 min after the BAT trigger 
time.
No new object was detected within the XRT enhanced error region (Goad et 
al. GCN
31771). The observations were affected by the nearby full Moon and in 
some cases
also by Sahara dust.

In the following table we report the preliminary photometry of our 
observations.
Upper limits are reported at the 3-sigma limit, in the AB system.

T-T0 (hr)| MJD    | Observatory| Filter| Upp.Mag.
____________________________________________________
0.23 |59657.746539| KNC-HAN    |  Lum      | 18.6
0.94 |59657.775880| KNC-HAN    |  Lum      | 18.7
1.38 |59657.794039| KNC-TJML   |  Clear    | 15.7
2.79 |59657.852604| KNC-T-BRO  |  Clear    | 18.6
2.89 |59657.856921| KNC-K26    |  Lumen    | 18.2
4.01 |59657.903715| KNC-T-CAT  |  Blue     | 19.4
4.01 |59657.903715| KNC-T-CAT  |  Green    | 19.5
4.01 |59657.903715| KNC-T-CAT  |  Red      | 18.2
5.47 |59657.964502| KNC-TJMS-PS|  Lumen    | 20.0
5.62 |59657.970540| ALi-50     |  Clear    | 20.1
7.22 |59658.037350| KNC-T-AGU  |  Lum      | 18.8
10.85|59658.188623| C11FREE    |  Rc       | 18.7

Most of these observations were performed in the context of the 
Kilonova-Catcher
programme (KNC), a professional-amateur collaboration within the GRANDMA
project, and in some cases using non-standard filters. The KNC 
images have been
processed using the MUPHOTEN pipeline (Duverne et al. 2021) and 
photometry was
performed using field stars from the PanSTARRS catalogue as reference.

GRANDMA is a worldwide coordinated 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/).