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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"
  1. GRB 070802: Swift detection of a burst
  2. GRB 070731, Swift-BAT refined analysis
  3. Konus-A observation of GRB 070729
  4. Swift/UVOT detection of GRB070714B
  5. AGILE-ACS position for the SGR 1806-20 July 27 burst
  6. GRB 070724B: pseudo-z ~ 1.10 from prompt emission spectrum
  7. GRB 070729: LCO optical imaging
  8. VLA upper limit on short hard burst GRB 070714B
  9. Intense burst from SGR 1806-20 detected on July 27
  10. GRB070729: Swift/UVOT upper limits
  11. GRB 070729: Swift-XRT refined analysis
  12. GRB 070729, Swift-BAT refined analysis
  13. GRB 070729: Magellan NIR Observations
  14. GRB 070724B: P60 Observations
  15. GRB 070729: Swift detection of a short hard burst
  16. GRB 070724B: Swift/UVOT Upper limits
  17. GRB070721A: Swift/UVOT Detection of a Weak Afterglow
  18. GRB 070724B: Swift-XRT afterglow likely candidate
  19. GRB 070721A: optical observations
  20. GRB 070724A: further VLT observations
  21. GRB 070724B: Suzaku WAM observation of the prompt emission
  22. Konus-Wind observation of GRB 070724B
  23. GRB 070724B: Analysis of AGILE gamma-ray data
  24. GRB 070724B: Swift-XRT afterglow candidates
  25. GRB 070724b: First Gamma Ray Burst Localization by SuperAGILE onboard
  26. Four radio sources in Swift-XRT error box of GRB 070724
  27. GRB 070724: optical observations
  28. GRB070724: Host galaxy redshift
  29. GRB 070724: P60 and Gemini Observations
  30. GRB 060814 - Keck host detection and redshift
  31. GRB 070724: IR observations
  32. GRB 070724: Closer association with DSS source
  33. Swift/UVOT refined analysis of GRB070724
  34. GRB 070724: Swift-XRT Team refined analysis
  35. GRB 070724: Pre-Imaging Shows a Source in the XRT Error Circle
  36. Short-Hard GRB070714B: PROMPT Observations
  37. GRB 070724, Swift-BAT refined analysis of a short burst
  38. GRB 070721B: further observations and analysis
  39. GRB 070724: Swift detection of a burst
  40. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  41. GRB 070714B: Keck observations
  42. GRB 070721B: optical observations and proposed redshift
  43. Swift/UVOT observations of GRB070721B optical afterglow.
  44. GRB 070721B, Further Swift-BAT refined analysis
  45. Swift/UVOT Observations of GRB070721A
  46. GRB 070721B : Faulkes Telescope South observations
  47. GRB 070721B: Swift-XRT refined analysis
  48. GRB 070721A : Faulkes Telescope South optical limit
  49. GRB 070721A: Swift/XRT refined analysis
  50. GRB 070721B, Swift-BAT refined analysis
  51. GRB 070721A, Swift-BAT refined analysis
  52. GRB070721B: A bright UVOT candidate
  53. GRB 070721B: Swift detection of a burst
  54. GRB 070721: Swift detection of a possible burst
  55. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  56. GRB 070714B : Suzaku WAM observation of the prompt emission
  57. GRB 070714A: Swift-BAT T_zero
  58. GRB070714B: TNG NIR observations
  59. Erratum : Suzaku WAM observation of GRB 070704
  60. GRB 070714A: Swift/UVOT Upper limits
  61. GRB 070714B: Swift/UVOT Upper Limits
  62. GRB 070714B: Swift-BAT spectral lag for the SHB
  63. GRB 070714B: confirmation of optical afterglow
  64. GRB 070616: No Evidence for I Band Afterglow
  65. GRB 070714A: Swift XRT refined analysis
  66. GRB070714B: Swift-XRT refined analysis
  67. GRB 070707: Swift-XRT follow-up observations
  68. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  69. GRB 070714 ("Bastille"): Optical Pre-Imaging
  70. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  71. GRB 070714A, Swift-BAT refined analysis
  72. GRB 070714 : Liverpool Telescope optical counterpart ?
  73. GRB 070714: Swift detection of a bright burst, possibly short
  74. Swift detection of a possible burst (Trigger 284850)
  75. SN 2007bg - off-axis GRB?
  76. GRB 070704: RTT150 optical observations
  77. GRB 070704: Suzaku/WAM observation of the prompt emission
  78. Konus-Wind observation of GRB 070707
  79. Updated Swift/UVOT calibration
  80. GRB 070707: optical afterglow
  81. GRB 070707: object inside XRT error circle
  82. Swift/UVOT Observations of GRB070707
  83. Swift XRT observation of GRB 070707
  84. GRB 070707: VLT observations
  85. INTEGRAL GRB 070707 is a short hard burst
  86. INTEGRAL GRB 070707 is a short hard burst
  87. GRB 070707: A long GRB detected by INTEGRAL
  88. GRB 070707: A long GRB detected by INTEGRAL
  89. GRB 070429B: NIR Observations
  90. GRB070704: FAVOR optical observations
  91. GRB 070704 : Liverpool Telescope Observations
  92. GRB 070611: VLT observations
  93. VLA detection of GRB 070612A in C Band
  94. Konus-Wind observation of GRB 070626
  95. GRB 070704: Swift-XRT refined analysis
  96. Swift/UVOT Observations of GRB070704
  97. GRB 070704, Swift-BAT refined analysis
  98. GRB 070704: Correction to GCN Circ 6594
  99. GRB 070704: Swift detection of a burst
  100. GRB 070626: Suzaku/WAM observation of the prompt emission

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