TITLE:   GCN CIRCULAR
NUMBER:  32058
SUBJECT: GRB 220514A: GRANDMA Optical Afterglow Observations
DATE:    22/05/17 21:18:06 GMT
FROM:    Cristina Andrade at UMN  <andra104@umn.edu>

S. Yan (THU), C. Andrade (UMN), S. Beradze (AbAO), P.A. Duverne (IJCLAB),
K. Kruiswijk (UCLouvain), G. Raaijmakers (GRAPPA), M. Vardosanidze (AbAO),
D. Turpin (CEA/Irfu, Saclay), M. Pilloix, S. Antier,
A. de Ugarte Postigo (CNRS-OCA-ARTEMIS), D. A. Kann (IAA-CSIC), A. Simon,
A. Baransky (Kyiv Univ), V. Godunova (IC ICAMER), R. Inasaridze,
R. Natsvlishvili, N. Kochiashvili, V. Aivazyan, G. Kapanadze,
D. Datashvili (AbAO),  C. Rinner, Z. Benkhaldoun (OUCA), M. Freeberg (KNC),
A. Kaouech (OUCA/KNC), F. Guo,  X. Wang,  S. X. Wang (THU), Y. Wang (NAOC),
S. Karpov, M. Masek, M. Prouza (FZU)
report on behalf of the GRANDMA collaboration:

The GRANDMA telescope network responded to the alert of GRB 220514A
(Fermi GBM team GCN 32038, Biltzinger et al. GCN 32039, S.
Mereghetti et al. GCN 32041).

The first observations were obtained with TNT, starting
1.57 h after the Fermi/GBM and INTEGRAL/IBAS trigger time, in which we
detect the afterglow.

We furthermore detect the optical afterglow with MOSS 7.95h after trigger
at a magnitude of 20.18 +/- 0.15 mag in a Clear image. The afterglow is
also detected in a stack by the 2.2m CAHA equipped with the CAFOS
instrument 9.58h after trigger in the i' band at 19.86 +/- 0.16 mag.
Upper limits are given at 3 sigma.

The following table displays part of our photometry with magnitudes
given in the AB system and calibrated with respect to field stars from
the Pan-STARRS and APASS catalogs, using the MUPHOTEN pipeline (Duverne et
al. 2021). The FRAM image has been calibrated versus GAIA DR2 G magnitudes.


T-T0 (hr)| MJD      | Observatory| Exposure  | Filter | Mag +/- err (AB)
________________________________________________________________
1.57    |59713.58235| TNT        | 3 x 300 s | r'     | 18.84 +/- 0.07
7.66    |59713.83624| AbAO-T70   | 9 x  60 s | R      | > 16.9
7.95    |59713.84841| MOSS       |45 x  60 s | Clear  | 20.18 +/- 0.15
8.23    |59713.86003| KNC-HAO    |15 x 120 s | R      | > 19.4
8.50    |59713.86140| FRAM       |15 x 120 s | Clear  | > 18.5
9.58    |59713.91610| CAHA/CAFOS |10 x 150 s | i'     | 19.86 +/- 0.16
15.06   |59714.14438| KNC-T21    |17 x 180 s | Rc     | > 19.3

T-T0 is the delay between the start of the observation and the IBAS
trigger time.

The detections and upper limits are consistent with previous reports of
detections by MeerLICHT (de Wet et al. GCN 32044) and KAIT (Zheng et al.
GCN 32051) and upper limits by MASTER (Lipunov et al. GCN 32042 & GCN
32043).

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/).