{
  "bibcode": "2010GCN.10820....1R",
  "body": "V. Rumyantsev (CrAO), A. Pozanenko (IKI)  report on behalf of  larger GRB \nfollow-up collaboration:\n\nWe observed the field of the Swift GRB 100513A (Baumgartner  et al. GCN \n10746)\nwith Shajn telescope of  CrAO in R-filter between May, 13 (UT) 18:43 --  \n20:38,  and in I-filter on May, 14 (UT)  19:47 -- 20:57 and  on May, 16 (UT) \n18:28 -- 20:20.\nThe afterglow (Morgan  et al. GCN  10747) is clearly detected on May, 13,14 \nand not detected on May 16. The afterglow coordinates are (J2000) RA = 11 18 \n26.85 Dec = +03 37 40.3 with uncertainty of 0.3 arcsec.\n\nThe photometry of  stacked images based on USNO-B1.0 star 0936-0206849 \n(RA(J2000) = 11:18:37.91 Dec(J2000)=  +03:37:43.1)  assuming  R=18.59 \nI=17.88 is following:\n\nT0+      Filter,   Exposure,  mag.                Upper Limit\n(mid, d)              (s)\n\n\n\n0.7313   R       104x60        23.03 +/- 0.12  24.3\n1.7573   I          64x60        21.59 +/- 0.07  23.6\n\n3.7202   I          91x60        >23.5                23.5\n\n\n\nThe combined images can be found at http://grb.rssi.ru/GRB100513A/\n\n\n\nUsing above photometry combined with reported earlier (R = 21.39 at 2.46 \nhours, GCN 10750; J-filter photometry in GCNs 10747, 10749; i'=21.3 at 9.89 \nhours, GCN 10757) one can suggest taht power law index of decay light curve \nin J, R and I- bandpass is compatible and equal to ~0.7 in the first day. \nThe break of power law can be assumed in I-band between first and third days \nwith power law decay index > 2.",
  "circularId": 10820,
  "createdOn": 1275424018000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 100513A: CrAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 100513A"
}