[vsnet-grb-info 24904] GRB 200205A = Swift J0840.7-3516: optical photometry in Chilescope observatory
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Feb 7 03:32:42 JST 2020
TITLE: GCN CIRCULAR
NUMBER: 27003
SUBJECT: GRB 200205A = Swift J0840.7-3516: optical photometry in Chilescope observatory
DATE: 20/02/06 18:31:31 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
E. Mazaeva (IKI), A. Pozanenko (IKI), M. Krugov (AFIF), A. Volnova
(IKI), S. Belkin (IKI) report on behalf of IKI-FuN follow-up collaboration:
We observed the newly discovered transient X-ray pulsar Swift
J0840.7-3516 (Kennea et al., GCN 27000) initially classified as GRB
200205A (Evans et al., GCN 26982; Niwano etal., GCN 26987; Osborne
et al., GCN 26996). Observation of Chilescope RC-1000 started on Feb. 6
(UT) 02:13:56 in r'-filter. We detect optical transient (Evans et al.,
GCN 26982; Lipunov et al., GCN 26984; Melandri et al., GCN 26986;
Malesani et al., GCN 26989).
Preliminary photometry is following.
Date UT start MJD_mid Filter Exp. OT(AB) Err. UL
(mid, days) (s)
2020-02-06 02:13:56 58885.11255 r' 5*600 19.70 0.06 22.1
The photometry is based on nearby stars of APASS catalog
Ref.stars
APASS_id r’ err
45257574 15.130 0.014
45257540 14.807 0.061
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