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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"

19538 results found.

  1. GRB 071112B: Swift detection of a short hard burst
  2. GRB 071112: Swift detection of a possible burst
  3. VLA IInd observation of INTEGRAL burst GRB 071109
  4. Swift/UVOT initial analysis of GRB071109
  5. GRB 071109: further Swift-XRT analysis
  6. No radio detection at Swift-XRT position
  7. GRB 071109: Swift-XRT possible X-ray counterpart
  8. GRB 071104: Swift-XRT Team Refined Analysis
  9. GRB 071104: Possible Swift UVOT Afterglow Candidate
  10. GRB 071104: Swift-XRT position
  11. Swift XRT and UVOT observations of GRB071028B
  12. GRB 071101, Swift-BAT refined analysis
  13. GRB 071101: Swift-XRT Team refined analysis
  14. GRB 071101: TAROT Calern observatory optical observations
  15. GRB 071101: Swift XRT position
  16. GRB 071101: BOOTES-2 prompt optical observations
  17. GRB 071101: a nearby galaxy
  18. GRB 071101: Swift detection of a burst
  19. GRB 071031, Swift-BAT refined analysis
  20. GRB 071031: Swift/UVOT detection of afterglow
  21. GRB 071031: Swift-XRT Team refined analysis
  22. GRB 071031: Swift detection of a burst with an optical counterpart
  23. GRB 071028B Swift-BAT detection of a burst
  24. Swift UVOT upper limits to GRB071028
  25. GRB 071028: Swift-XRT Team refined analysis
  26. GRB 071028, Swift-BAT refined analysis
  27. GRB 071028: Swift detection of a burst
  28. GRB 071025: Kuiper Telescope Optical Observations
  29. GRB 071018: Revised BAT position
  30. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  31. GRB071021: MARGE Optical Limits
  32. GRB071020, optical upper limit
  33. GRB 071025 Milagro GeV/TeV Observations
  34. Swift UVOT upper limits
  35. GRB 071025: Swift-XRT Team refined analysis
  36. GRB 071025, Swift-BAT refined analysis
  37. GRB 071025: Early Super-LOTIS Observations
  38. GRB 071025: ROTSE-III Refined Analysis
  39. GRB 071025: Swift XRT refined position
  40. GRB 071025: ROTSE-III Detection of Optical Counterpart
  41. GRB 071025: Swift detection of a burst
  42. GRB 071020: BTA spectroscopy
  43. Possible radio detection of GRB 071021 with the VLA
  44. Radio detection of GRB 071020 with the VLA
  45. GRB 071021: optical and NIR observations
  46. GRB 071021, Swift-BAT refined analysis
  47. GRB 071021: Swift-XRT Team refined analysis
  48. Konus-Wind observation of GRB 071020
  49. GRB 071021: Swift detection of a burst
  50. GRB 071020: Swift-XRT refined analysis
  51. GRB 071020, Swift-BAT refined analysis
  52. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  53. GRB071020 - SDSS Pre-burst Observations
  54. GRB 071020: Swift detection of a bright burst
  55. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  56. GRB 071018: Mercator Telescope optical observations
  57. Swift autonomous slewing re-enabled
  58. GRB 071018: Swift-XRT observation
  59. GRB 071017 - Swift XRT observations
  60. VLA radio observation of GRB 071018
  61. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  62. GRB 071018, Swift-BAT refined analysis
  63. GRB 071018?: Swift detection of a possible burst
  64. GRB 071010B: Suzaku WAM observation of the prompt emission
  65. GRB 071013: 3rd TLS Epoch - constraints on variability
  66. GRB 071013: TLS Upper Limit
  67. VLA detection of radio afterglow of GRB 071010B
  68. VLA non-detection of GRB 071011
  69. GRB 071013: Optical observations
  70. GRB 071013, Swift-BAT refined analysis
  71. GRB 071013: Swift detection of a burst
  72. GRB 071010C Swift-BAT detection of a burst
  73. GRB 071011: Swift-XRT refined analysis
  74. VLA non-detection of GRB 071010A
  75. GRB 071011, Optical afterglow
  76. GRB 071011: MARGE Optical Limits
  77. GRB 071011: XRT afterglow detection
  78. GRB 071011, Swift-BAT refined analysis
  79. GRB 071011: Early Super-LOTIS Observations
  80. GRB 071010B: Bright OT confirmed with TLS
  81. GRB 071011: Swift detection of a burst
  82. Optical Observation: GRB 071010
  83. Optical observations: GRB 071010A
  84. Konus-Wind observation of GRB 071010B
  85. GRB071010B: Swift/XRT detection
  86. GRB 071010B, Swift-BAT refined analysis
  87. GRB 071006, Swift-BAT refined analysis
  88. GRB 071010B: Swift detection of a burst
  89. GRB 071010: Swift-XRT observation
  90. GRB 071008, Swift-BAT refined analysis
  91. GRB 071010, Swift-BAT refined analysis
  92. GRB071008: Swift-XRT observation
  93. GRB 071010: TAROT La Silla observatory detection of the afterglow
  94. GRB 071010: Swift detection of a burst
  95. GRB 071006 Swift-BAT detection of a burst
  96. GRB071008: IAC80 observation
  97. GRB 071008: Swift detection of a burst
  98. GRB 071003: XRT refined analysis
  99. GRB070920A: MAGIC telescope GeV observation
  100. Radio detection of GRB 071003 with the VLA

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