{
  "bibcode": "2013GCN.14504....1Q",
  "body": "U.Quadri, L.Strabla, R.Girelli and A.Quadri \nreport:\n\nPhotometric optical measurements of GRB 130418A detected by SWIFT trigger 553847 \n(de Pasquale et al. 2013; GCN Circ. 14377) have been done using the Schmidt \ntelescope 0.32m F/3.1 and Starlight CCD camera HX-516 applied at direct focus. \n120 sec. exposure time and 2x2 binning were used for all photos. \nAll exposure were unfiltered. \nFlat field and dark have been captured and all images were corrected with them. \nAstrometrica software version 4.6.5.390 was used to perform differential photometry on \nthe reduced images. \n\nbegan of period: 2013/04/18.80415 -  17 min after  the burst.\nend   of period: 2013/04/18.92338 - 188 min after  the burst.\n\n\nThe photometric results as follow:\n\n------------------------------------\nDate UTC             Mag.   1 sigma.\n------------------------------------\n\t\n2013 04 18.80485    15.68    0.08\n2013 04 18.80846    16.12    0.13\n2013 04 18.82000    16.44    0.10\n2013 04 18.90014    17.64    0.08\n2013 04 18.85910    17.21    0.13\n2013 04 18.87354    17.39    0.12\n2013 04 18.88799    17.53    0.09\n2013 04 18.90968    17.74    0.09\n\n------------------------------------\n\nMagnitudes were estimated with the USNO-B1 cat. \nand are not corrected for galactic dust extinction.\n\nImages and analisis are available at the following address:\n\nhttp://www.osservatoriobassano.org/archivio/grb/GRB130418A-Trig-553847-2013-04-18.htm\n\nThis message may be cited.",
  "circularId": 14504,
  "createdOn": 1367256635000,
  "email": "oabb@ulisse.bs.it",
  "subject": "GRB 130418A: Bassano Bresciano Observatory lightcurve analisis",
  "submitter": "Ulisse Quadri at Bassano Bresciano Obs  <oabb@ulisse.bs.it>",
  "eventId": "GRB 130418A"
}