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krypton:
TITLE: GCN CIRCULAR
NUMBER: 24947
SUBJECT: GRB 190630C: ISON-Castelgrande optical upper limit
DATE: 19/07/01 20:07:58 GMT
FROM: Alexei Pozanenko at IKI, Moscow
S. Belkin (IKI), S. Schmalz (KIAM), A. Pozanenko (IKI), A. Volnova
(IKI), E. Mazaeva (IKI), I. Molotov (KIAM) report on behalf of larger
GRB IKI FuN collaboration:
We observed the field of GRB 190630C (Ukwatta et al., GCN 24927) with
ORI-22 (22 cm) telescope of ISON-Castelgrande observatory in Clear
filter starting on July 01 (UT) 00:03:42. We do not detect any object
within enhanced Swift-XRT position (Goad et al., GCN 24930). Preliminary
photometry of the field is following
Date UT start t-T0 Filter Exp. OT Err. UL
(mid, days) (s)
2019-07-01 00:03:42 0.02584 CR 53*60 n/d n/d 18.8
The photometry is based on nearby USNO-B1.0 (R2) stars.
krypton:
TITLE: GCN CIRCULAR
NUMBER: 25683
SUBJECT: ZTF19abvizsw: AbAO and CrAO photometry
DATE: 19/09/07 14:05:41 GMT
FROM: Alexei Pozanenko at IKI, Moscow
S. Belkin (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO), V.
Rumyantsev (CrAO), A. Volnova (IKI), E. Mazaeva (IKI), I. Molotov
(KIAM) report on behalf of IKI GRB FuN collaboration:
We observed the ZTF19abvizsw/AT2019pim (Kool et al., GCN 25616; Burdge
et al., GCN 25639; Wei et al., GCN 15640; Perley et al., GCN 25643;
Levan et al., GCN 25653; Becerra et al., GCN 25655;) with AS-32 (0.7m)
telescope of Abastumani Observatory and ZTSh telescope of CrAO.
Preliminary photometry of the the optical transients is following.
date UT start MJD Filter Exp. OT OT_err Obs./Tel.
(mid, d) (s)
2019-09-04 16:54:07 58730.723 R 54*60 21.27 0.16 AbAO/AS-32
2019-09-05 21:49:03 58731.923 R 20*120 21.33 0.14 CrAO/ZTSh
The photometry of the latest epoch of 2019-09-05 might be slightly
contaminated by red southward star (see also Burdge et al., GCN 25639).
We note the flattening of the initial decay previously reported by
Becerra (GCN 25655).
The photometry is based on nearby USNO-B1.0 stars
USNO-B1.0_id R2
1514-0239703 18.81
1514-0239806 19.68
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