{
  "submittedHow": "web",
  "bibcode": "2024GCN.37327....1Q",
  "circularId": 37327,
  "eventId": "GRB 240828A",
  "subject": "Fermi GRB 240828A: Bassano Bresciano Observatory upper limit",
  "createdOn": 1724878653486,
  "submitter": "Ulisse Quadri at Bassano Bresciano Observatory <osservatoriobassano@gmail.com>",
  "body": "U.Quadri, L.Strabla and P.Madurini (Bassano Bresciano Astronomical Observatory),\n\nMembers of: \nGRB/UAI - Gamma ray Burst section of Unione Astrofili Italiani.\nAAVSO - American Association of Variable Star Observers.\nGAC - Gruppo Astrofili Cremonesi.\n\nIn a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan), \nY. Niino (Tokyo University, Institute of Astronomy), \nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\nreport:\n\nWe performed optical follow-up observations of the GRB 240828A discovered by the Fermi satellite. \nWe used the Baker-Schmidt telescope (Diam 250mm F/3) of the (IAU station 565) Bassano Bresciano Astronomical Observatory (Italy). \n\nThe single Field of the telescope is 41.2' x 30.7'\nTo cover the uncertainty zone of the satellite position, we performed a mosaic of 9 images in order to cover a rectangle with sides of 2.1 x 1.5 degrees centered on the coordinates J2000 14h 36m, 35d 47'\n\nWe performed a total of 9 pointings to cover an area of 3.9 square degrees. For each pointing, 10 images were taken with duration of 20 seconds each. \n\nThe limiting magnitude is CR 17 (CR= Unfiltered with R zero point). \n\nThe sequence of pointing and the taking of images were automated by means of a telescope control software developed at our observatory. \n\nThe image analysis was performed using the subtraction method, with the template from POSS2/UKTSU Red images. \n\nThe observations started 4 hour after the GRB trigger.\n\nFor each field, we co-added 10 exposures of 20 sec each.\n\nStart T0+      End T0+      CR lim\n4.03 hour     4.81 hour     17\n\nWe did not found any credible optical counterpart in the error box of the \nFermi Satellite. \n\nMagnitudes were estimated with the pan-STARRS cat \nand are derived using Lupton (2005) equations.\nNot corrected for galactic dust extinction.\n\nReference:\nhttp://www.osservatoriobassano.org\n\nThe message may be cited.",
  "format": "text/plain"
}