GCN Circular 24556
Subject
GRB 190515B: Kitab Observatory optical upper limit
Date
2019-05-15T18:43:38Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Novichonok (KIAM), A. Pozanenko (IKI), E. Mazaeva
(IKI), A. Volnova (IKI), I. Molotov (KIAM) report on behalf of larger
IKI GRB FuN collaboration:
We observed the field of the Swift GRB 190515B (Moss et al., GCN 24553)
with RC-36 0.36-m telescope of Kitab Observatory starting on May 15
(UT) 16:13:02 in Clear filter. We do not find any optical source
neither in the first image, nor in a stacked image within prompt
enhanced Swift-XRT position (Evans et al., GCN 24554).
Preliminary photometry of the field is following.
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2019-05-15 16:13:02 0.00655 CR 1*90 n/d n/d 18.6
2019-05-15 16:13:02 0.02686 CR 40*90 n/d n/d 20.3
The photometry is based on the nearby USNO-B1 (R2) star:
USNO-B1.0_id R2
1422-0205150 15.02
The closest object which is not presented in any catalogs marginally
detected in our stacked image has coordinates (J2000) 06:35:24.07
+52:19:12.4 with uncertainty of 1 arcsec in both coordinates and
brightness of 20.4m (S/N =2). The position of the object is 12 arcsec
apart from the the center of prompt enhanced Swift-XRT position (Evans
et al., GCN 24554). At this time we cannot say about variability of the
object.
[GCN OPS NOTE(15may19): The GRB anme "190515A" was changed to "190515B"
in the Subject line and in the first sentence.]