{
  "bibcode": "2003GCN..2217....1S",
  "body": "K. Sasaki (Japan Fireball Network), M. Tomita (Japan Fireball\nNetwork), K. Ohnishi (Nagano National College of Technology), \nand K. Torii (RIKEN) report:\n\n The sky area of GRB 030329 (Vanderspek, et al., GCN 1997) was\ncontemporaneously photographed on 2003 March 29 by K. Sasaki and\nM. Tomita with all-sky patrol cameras.\n\n In the frames tabulated below, no significant object is found at the\nposition of the optical afterglow (Peterson and Price, GCN 1985;\nTorii, GCN 1986). We derive preliminary upper limits for the optical\ntransient by comparison with either 41 LMi (V=5.1) or 54 Leo (V=4.3)\nwhich is significantly detected.\n\nData from KS\n-----------------------------\nStart(UT) End(UT) Mag.\n-----------------------------\n10:40:00 10:59:58 >5.1\n11:00:00 11:19:58 >5.1\n11:20:00 11:39:58 >5.1\n11:40:00 11:59:58 >5.1\n-----------------------------\n\nData from MT\n-----------------------------\nStart(UT) End(UT) Mag.\n-----------------------------\n10:30:00 10:59:00 >4.3\n11:00:00 11:29:00 >4.3\n11:30:00 11:59:00 >4.3\n12:00:00 12:29:00 >4.3\n12:30:00 12:59:00 >4.3\n-----------------------------\n\n Effective exposure for each frame,\n399 s for KS and 580 s for MT, is 1/3 of the elapsed time\ndue to a rotating shutter in front of the optics.\n\n Details of the instruments, originally designed for detecting\nfireballs (bright meteors), are as follows.\n\nPosition of the observatory: KS\nIwate, Japan\n141d08m24s E, +39d28m22s N, 100m altitude\n\nPosition of the observatory: MT\nIshikawa, Japan\n136d48m01s E, +36d55m39s N, 10m altitude\n\nThe following instruments are common to the two observatories.\n\nCamera: Canon T70 with command back\nOptics: Canon New FD 15mm f/2.8 full-frame fish-eye lens, used at f/2.8\nFilter: No\nFilm: Kodak TMAX 400\nRotating shutter: Open fraction is 1/3\n---------------------------------------------",
  "circularId": 2217,
  "createdOn": 1052381175000,
  "email": "torii@crab.riken.go.jp",
  "subject": "GRB 030329: Optical limit (contemporaneous photography)",
  "submitter": "Ken ichi Torii at RIKEN  <torii@crab.riken.go.jp>",
  "eventId": "GRB 030329"
}