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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19420 results found.

  1. GRB 071101: a nearby galaxy
  2. GRB 071101: Swift detection of a burst
  3. GRB 071031, Swift-BAT refined analysis
  4. GRB 071031: Swift/UVOT detection of afterglow
  5. GRB 071031: Swift-XRT Team refined analysis
  6. GRB 071031: Swift detection of a burst with an optical counterpart
  7. GRB 071028B Swift-BAT detection of a burst
  8. Swift UVOT upper limits to GRB071028
  9. GRB 071028: Swift-XRT Team refined analysis
  10. GRB 071028, Swift-BAT refined analysis
  11. GRB 071028: Swift detection of a burst
  12. GRB 071025: Kuiper Telescope Optical Observations
  13. GRB 071018: Revised BAT position
  14. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  15. GRB071021: MARGE Optical Limits
  16. GRB071020, optical upper limit
  17. GRB 071025 Milagro GeV/TeV Observations
  18. Swift UVOT upper limits
  19. GRB 071025: Swift-XRT Team refined analysis
  20. GRB 071025, Swift-BAT refined analysis
  21. GRB 071025: Early Super-LOTIS Observations
  22. GRB 071025: ROTSE-III Refined Analysis
  23. GRB 071025: Swift XRT refined position
  24. GRB 071025: ROTSE-III Detection of Optical Counterpart
  25. GRB 071025: Swift detection of a burst
  26. GRB 071020: BTA spectroscopy
  27. Possible radio detection of GRB 071021 with the VLA
  28. Radio detection of GRB 071020 with the VLA
  29. GRB 071021: optical and NIR observations
  30. GRB 071021, Swift-BAT refined analysis
  31. GRB 071021: Swift-XRT Team refined analysis
  32. Konus-Wind observation of GRB 071020
  33. GRB 071021: Swift detection of a burst
  34. GRB 071020: Swift-XRT refined analysis
  35. GRB 071020, Swift-BAT refined analysis
  36. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  37. GRB071020 - SDSS Pre-burst Observations
  38. GRB 071020: Swift detection of a bright burst
  39. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  40. GRB 071018: Mercator Telescope optical observations
  41. Swift autonomous slewing re-enabled
  42. GRB 071018: Swift-XRT observation
  43. GRB 071017 - Swift XRT observations
  44. VLA radio observation of GRB 071018
  45. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  46. GRB 071018, Swift-BAT refined analysis
  47. GRB 071018?: Swift detection of a possible burst
  48. GRB 071010B: Suzaku WAM observation of the prompt emission
  49. GRB 071013: 3rd TLS Epoch - constraints on variability
  50. GRB 071013: TLS Upper Limit
  51. VLA detection of radio afterglow of GRB 071010B
  52. VLA non-detection of GRB 071011
  53. GRB 071013: Optical observations
  54. GRB 071013, Swift-BAT refined analysis
  55. GRB 071013: Swift detection of a burst
  56. GRB 071010C Swift-BAT detection of a burst
  57. GRB 071011: Swift-XRT refined analysis
  58. VLA non-detection of GRB 071010A
  59. GRB 071011, Optical afterglow
  60. GRB 071011: MARGE Optical Limits
  61. GRB 071011: XRT afterglow detection
  62. GRB 071011, Swift-BAT refined analysis
  63. GRB 071011: Early Super-LOTIS Observations
  64. GRB 071010B: Bright OT confirmed with TLS
  65. GRB 071011: Swift detection of a burst
  66. Optical Observation: GRB 071010
  67. Optical observations: GRB 071010A
  68. Konus-Wind observation of GRB 071010B
  69. GRB071010B: Swift/XRT detection
  70. GRB 071010B, Swift-BAT refined analysis
  71. GRB 071006, Swift-BAT refined analysis
  72. GRB 071010B: Swift detection of a burst
  73. GRB 071010: Swift-XRT observation
  74. GRB 071008, Swift-BAT refined analysis
  75. GRB 071010, Swift-BAT refined analysis
  76. GRB071008: Swift-XRT observation
  77. GRB 071010: TAROT La Silla observatory detection of the afterglow
  78. GRB 071010: Swift detection of a burst
  79. GRB 071006 Swift-BAT detection of a burst
  80. GRB071008: IAC80 observation
  81. GRB 071008: Swift detection of a burst
  82. GRB 071003: XRT refined analysis
  83. GRB070920A: MAGIC telescope GeV observation
  84. Radio detection of GRB 071003 with the VLA
  85. GRB 070810B: further XRT analysis
  86. Konus-Wind observation of GRB 071003
  87. GRB 071003: Swift XRT position
  88. GRB 071003, Swift-BAT refined analysis
  89. GRB 071003: MARGE Observations
  90. GRB 071003 Optical observations
  91. GRB 071003: KAIT optical afterglow observations
  92. GRB 071003: Swift detection of a bright burst
  93. GRB 070714B: host galaxy spectroscopic redshift
  94. GRB 071001: Swift-XRT Team refined analysis
  95. GRB 071001, Swift-BAT refined analysis
  96. Faulkes Telescope South observations of GRB 071001
  97. GRB 071001: Swift detection of a burst
  98. VLA observation of GRB 070923
  99. Disregard the Swift-XRT Notices today
  100. GRB070925: Swift-XRT Afterglow confirmation

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