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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

39340 results found.

  1. XRF050522: Radio Observations
  2. GRB 050509A: Further I-band imaging
  3. GRB050522,optical observation
  4. GRB050520,optical observation
  5. XRF 050522: Continued NIR P200 Monitoring
  6. RBO Observations of GRB050522
  7. GRB050509b: optical observations
  8. Recent GRB BVRcIc field photometry
  9. GRB050520: Radio Observations
  10. XRF 050522: Swift XRT observation
  11. XRF050522, BVRcIc field photometry
  12. XRF050522: Optical Observations
  13. XRF 050522: KAIT observations
  14. XRF 050522 detected with INTEGRAL
  15. GRB 050520: VLT/ULTRACAM observations
  16. Swift UVOT Observations of GRB 050520
  17. GRB 050520: Swift XRT refined analysis
  18. RBO Observations of GRB050520
  19. GRB 050520: P200 Observations
  20. GRB050520: Liverpool Telescope follow-up
  21. GRB 050520: TAROT optical limit
  22. GRB 050520: Swift XRT position
  23. GRB 050520: VLT/ULTRACAM observations
  24. GRB 050520: OSN optical observations
  25. GRB 050520: BART optical limit
  26. GRB 050520 - A long GRB detected with INTEGRAL
  27. Swift-BAT trigger 122203 is not a real GRB
  28. GRB 050504: Swift XRT afterglow candidate has faded
  29. XRF 050509c optical afterglow
  30. GRB 050509B and short GRB-SN association? (corrected)
  31. GRB 050509B and short GRB-SN association?
  32. GRB 050509B: Subaru Optical Observations
  33. GRB050502b: Early Observation
  34. GRB050509b, Bok telescope B-band imaging
  35. Refined Chandra analysis of GRB 050509b
  36. GRB050509b, SDSS pre-burst observations
  37. GRB 050509b: Keck/Chandra Cross-Correlation
  38. GRB 050509b: Keck/Chandra Cross-Correlation
  39. Chandra observation of GRB 050509b
  40. GRB 050509b: RAPTOR deep, early limits.
  41. GRB050509B: Optical/Infared observations
  42. GRB 050509b: Swift/UVOT follow-up measurements
  43. GRB 050509b Milagro GeV/TeV Observations
  44. GRB050509B: Optical observations at the Very Large Telescope
  45. GRB 050509b: No Optical Variability in XRT Error Circle
  46. GRB 050509a: Swift-BAT refined analysis
  47. GRB 050509c: ROTSE-III Optical Limits
  48. GRB 050509B: WSRT Radio Observations
  49. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  50. GRB 050505, early TAROT observation
  51. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  52. GRB 050509b: Further Analysis of Keck LRIS Images
  53. GRB050509c: REM NIR and Optical observations
  54. GRB 050509b: Physical Properties of the Candidate Host galaxy
  55. GRB 050505: SARA Observations
  56. Swift UVOT Follow-up Observations of GRB 050509B
  57. GRB 050509B, Optical Observations
  58. GRB 050509B: Swift/XRT refined analysis
  59. GRB 050509b: Optical observations
  60. GRB 050509b: Precision Astrometry
  61. GRB 050509b: Possible Optical Counterpart
  62. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  63. GRB 050509A: Optical observations
  64. GRB 050509b: Optical Counterpart Candidate
  65. GRB 050509b: PAIRITEL and WIYN Observations
  66. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  67. GRB 050509b: optical observations
  68. GRB 050509b: Swift XRT Position
  69. GRB 050509B: ROTSE-III Optical Limits
  70. Swift Detection of GRB050509b: A short duration burst
  71. GRB 050509a: Swift XRT Position
  72. Swift Detection of the Burst GRB050509
  73. Swift-BAT detection of GRB 050507
  74. GRB 050505: Keck I-band Magnitude
  75. GRB 050505: early time observations
  76. GRB 050505 - Faulkes Telescope North observations
  77. GRB 050502a: Swift XRT Upper Limit
  78. GRB 050505, simultaneous optical observation
  79. GRB 050505: Further Swift UVOT observations.
  80. GRB050505: AAVSO observations
  81. GRB050416A : 1 GHz limit from GMRT
  82. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  83. GRB 050505 UVOT
  84. GRB050505: Optical Afterglow Candidate
  85. GRB 050505: Swift XRT Position
  86. GRB050505 Swift-BAT refined analysis
  87. GRB 050502a: Optical Observations
  88. GRB 050416b:Swift XRT afterglow upper limits
  89. GRB 050416b:Swift XRT afterglow upper limits
  90. Swift-BAT detection of GRB050505
  91. GRB 050504: Swift XRT position
  92. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  93. GRB050502b: Afterglow Confirmation
  94. GRB050502: P200 Observations (Correction)
  95. GRB050502: P200 Observations
  96. GRB 050504 : R band observation at Lulin observatory
  97. Swift UVOT observation of GRB 050504
  98. GRB 050504, R band Observations
  99. GRB 050502b, V band Observations
  100. GRB050504: P60 Observations

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