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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"

31736 results found.

  1. Konus-Wind observation of GRB 070724B
  2. GRB 070724B: Analysis of AGILE gamma-ray data
  3. GRB 070724B: Swift-XRT afterglow candidates
  4. Four radio sources in Swift-XRT error box of GRB 070724
  5. GRB 070724: optical observations
  6. GRB070724: Host galaxy redshift
  7. GRB 070724: P60 and Gemini Observations
  8. GRB 060814 - Keck host detection and redshift
  9. GRB 070724: Closer association with DSS source
  10. Swift/UVOT refined analysis of GRB070724
  11. GRB 070724: Swift-XRT Team refined analysis
  12. GRB 070724: Pre-Imaging Shows a Source in the XRT Error Circle
  13. Short-Hard GRB070714B: PROMPT Observations
  14. GRB 070724, Swift-BAT refined analysis of a short burst
  15. GRB 070721B: further observations and analysis
  16. GRB 070714B: Keck observations
  17. GRB 070721B: optical observations and proposed redshift
  18. Swift/UVOT observations of GRB070721B optical afterglow.
  19. GRB 070721B, Further Swift-BAT refined analysis
  20. Swift/UVOT Observations of GRB070721A
  21. GRB 070721B : Faulkes Telescope South observations
  22. GRB 070721B: Swift-XRT refined analysis
  23. GRB 070721A : Faulkes Telescope South optical limit
  24. GRB 070721A: Swift/XRT refined analysis
  25. GRB 070721B, Swift-BAT refined analysis
  26. GRB 070721A, Swift-BAT refined analysis
  27. GRB070721B: A bright UVOT candidate
  28. GRB 070721B: Swift detection of a burst
  29. GRB 070721: Swift detection of a possible burst
  30. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  31. GRB 070714B : Suzaku WAM observation of the prompt emission
  32. GRB070714B: TNG NIR observations
  33. Erratum : Suzaku WAM observation of GRB 070704
  34. GRB 070714A: Swift/UVOT Upper limits
  35. GRB 070714B: Swift/UVOT Upper Limits
  36. GRB 070616: No Evidence for I Band Afterglow
  37. GRB 070714A: Swift XRT refined analysis
  38. GRB070714B: Swift-XRT refined analysis
  39. GRB 070707: Swift-XRT follow-up observations
  40. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  41. GRB 070714 ("Bastille"): Optical Pre-Imaging
  42. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  43. GRB 070714A, Swift-BAT refined analysis
  44. GRB 070714 : Liverpool Telescope optical counterpart ?
  45. GRB 070704: RTT150 optical observations
  46. GRB 070704: Suzaku/WAM observation of the prompt emission
  47. Konus-Wind observation of GRB 070707
  48. GRB 070707: optical afterglow
  49. GRB 070707: object inside XRT error circle
  50. Swift/UVOT Observations of GRB070707
  51. Swift XRT observation of GRB 070707
  52. GRB 070707: VLT observations
  53. GRB 070429B: NIR Observations
  54. GRB070704: FAVOR optical observations
  55. GRB 070704 : Liverpool Telescope Observations
  56. GRB 070611: VLT observations
  57. VLA detection of GRB 070612A in C Band
  58. Konus-Wind observation of GRB 070626
  59. GRB 070704: Swift-XRT refined analysis
  60. Swift/UVOT Observations of GRB070704
  61. GRB 070704, Swift-BAT refined analysis
  62. GRB 070704: Correction to GCN Circ 6594
  63. GRB 070626: Suzaku/WAM observation of the prompt emission
  64. GRB 070628 Swift-UVOT Refined Analysis
  65. GRB 070628: NIR detection of afterglow
  66. GRB 070628, Swift-BAT refined analysis
  67. GRB 070628: TAROT La Silla observatory optical observations
  68. GRB 070628: Swift XRT refined analysis
  69. GRB 070628: Watcher Observations
  70. GRB 070612A: Allen Telescope Array Observations
  71. INTEGRAL burst GRB070615: X-ray continued observations
  72. GRB 070616 : WIDGET simultaneous optical observations
  73. GRB 070616: Suzaku/WAM observation of the prompt emission
  74. GRB 070612A: Second Epoch WSRT Radio Observations
  75. GRB070621: RTT150 optical observations
  76. GRB 070621: VLT optical observations
  77. GRB 070621: Swift/UVOT Upper Limits
  78. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  79. GRB 070621: Swift-BAT refined analysis
  80. GRB070621: Swift XRT refined analysis
  81. GRB 070621: Gemini South optical imaging
  82. Observations of GRB070612A at Calar Alto
  83. GRB 070621: NOT observations
  84. GRB070621: OPTIMA-Burst optical upper limit
  85. GRB 070621: Watcher Observations
  86. GRB 070621: ROTSE-III Prompt Optical Limits
  87. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  88. GRB 070612A: TNG optical observations
  89. Swift/UVOT detection of GRB070616 optical afterglow.
  90. GRB070612A: Gemini Spectroscopic Redshift
  91. GRB 070612A: NOT observations
  92. GRB070616: Optical Observation by MITSuME Akeno
  93. GRB 070612B: Optical Observation by MITSuME Akeno
  94. GRB070616: Optical Observation by MITSuME Okayama
  95. GRB 070616, Swift-BAT further refined analysis
  96. GRB 070616: Swift XRT refined circular
  97. GRB 070612A: Possible WSRT Radio Detection
  98. Swift/UVOT observations of GRB070616
  99. GRB 070616: TLS observation
  100. Swift XRT observations of the INTEGRAL burst GRB070615: Possible

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