GCN Circular 10820
Subject
GRB 100513A: CrAO optical observations
Event
Date
2010-06-01T20:26:58Z (16 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB
follow-up collaboration:
We observed the field of the Swift GRB 100513A (Baumgartner et al. GCN
10746)
with Shajn telescope of CrAO in R-filter between May, 13 (UT) 18:43 --
20:38, and in I-filter on May, 14 (UT) 19:47 -- 20:57 and on May, 16 (UT)
18:28 -- 20:20.
The afterglow (Morgan et al. GCN 10747) is clearly detected on May, 13,14
and not detected on May 16. The afterglow coordinates are (J2000) RA = 11 18
26.85 Dec = +03 37 40.3 with uncertainty of 0.3 arcsec.
The photometry of stacked images based on USNO-B1.0 star 0936-0206849
(RA(J2000) = 11:18:37.91 Dec(J2000)= +03:37:43.1) assuming R=18.59
I=17.88 is following:
T0+ Filter, Exposure, mag. Upper Limit
(mid, d) (s)
0.7313 R 104x60 23.03 +/- 0.12 24.3
1.7573 I 64x60 21.59 +/- 0.07 23.6
3.7202 I 91x60 >23.5 23.5
The combined images can be found at http://grb.rssi.ru/GRB100513A/
Using above photometry combined with reported earlier (R = 21.39 at 2.46
hours, GCN 10750; J-filter photometry in GCNs 10747, 10749; i'=21.3 at 9.89
hours, GCN 10757) one can suggest taht power law index of decay light curve
in J, R and I- bandpass is compatible and equal to ~0.7 in the first day.
The break of power law can be assumed in I-band between first and third days
with power law decay index > 2.