TITLE:   GCN CIRCULAR
NUMBER:  17589
SUBJECT: GRB 150220A, the review of the sky area in plate archives
DATE:    15/03/16 14:22:03 GMT
FROM:    Valentyna Golovnya at Main Astro Obs,Kyiv  <golov_v@ukr.net>

V. V. Golovnya, V. M. Andruk (Main Astro Obs., Kyiv)
report: 
   We have undertaken the review of the sky area of GRB 150220A 
(P.A. Evans, GCN Circ. 17501) on astronegatives, collected in Ukrainian
plate archive (1976-1996). All the plates with the possible object 
appearance are digitized using Microtek ScanMaker 9800XL TMA and Epson
Expression 10000XL flatbed scanner and the images have been placed 
into Golosiiv Plate Archive database DBGPA with open access to them.

2 objects have been found on the plate GUA040C002183 (EPOCH=1993.2192).
Scanning and processing methods were described in [1-3]. The coordinates
and B magnitudes were obtained in the system of TYCHO-2 catalog: 

N of Obj.  MagTyc    RA(J2000)      Dec(J2000) 
1 (26646)  16.17   09h02m12.961s  -01d40’24.457”
2 (26663)  15.96   09 02 13.504   -01 39 51.118 
        Rms RA=0.093”, rms Dec=0.099”, rms MagTyc=0.21

 The list of plates is given in the table:
yyyymmdd/TimeUT-- ---Plates---- Exp. –Mag --USNO-A2----
19830119/20:30:49 TAS040A000485 28.0 16.4 0825-06684950
19900323/19:14:27 GUA040C003371 12.5 15.6 0825-06686191
19930319/19:23:16 GUA040C002183 21.8 15.7 0825-06683708
Plates:
GUA040C –The plates archive identifier of DWA (D/F=400/2000,
         M=103”/mm) of the Ukrainian NAS Main Astro obs.
         (Marsden's number - 83) the plate number [4].
TAS040A -the plates archive identifier of DAZ (D/F=400/3000,
         M=68.8”/mm) of the Tashkent Astro obs.
         (Marsden's number - 186) the plate number [4].
Exp.  - Duration of the maximum exposure (minutes).
Mag - Limited Bmag, derived in the 13 minutes area around the 
position: RA(J2000): 09h 01m 51.6s, Dec(J2000): -01d 38’ 03”.
USNO-A2 - Comparison star.
  The preview images of 3 areas together with the 13 min. of arc area
from Aladin can be found in
“http://gua.db.ukr-vo.org/img/grb/150220A/index.html”.
The images with full resolution are available via e-mail on demand.

References:
1. Andruk V.М., Butenko G.Z., Yatsenko A.I.: 2010, Kinematics and 
Physics of Celestial Bodies, 26/3, 75-81.
2. V.Golovnya, V.Andruk, A.Yatsenko: 2010, Journal of Physical 
Studies, 14, N2, 2902.
3. Yatsenko A.I., Andruk V.N., Golovnia V.V., Pakuliak L.K., Ivanov 
G.A.: 2011, Kinematics and Physics of Celestial Bodies, 27/3, 49-59.
4. L.Pakuliak: DBGPA V2.0, “http://gua.db.ukr-vo.org”.