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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"

28059 results found.

  1. GRB 070729: Swift-XRT refined analysis
  2. GRB 070729, Swift-BAT refined analysis
  3. GRB 070724B: P60 Observations
  4. GRB 070724B: Swift/UVOT Upper limits
  5. GRB 070724B: Swift-XRT afterglow likely candidate
  6. GRB 070721A: optical observations
  7. GRB 070724A: further VLT observations
  8. GRB 070724B: Suzaku WAM observation of the prompt emission
  9. GRB 070724B: Swift-XRT afterglow candidates
  10. Four radio sources in Swift-XRT error box of GRB 070724
  11. GRB 070724: P60 and Gemini Observations
  12. GRB 060814 - Keck host detection and redshift
  13. Swift/UVOT refined analysis of GRB070724
  14. GRB 070724: Swift-XRT Team refined analysis
  15. GRB 070724, Swift-BAT refined analysis of a short burst
  16. GRB 070721B: further observations and analysis
  17. GRB 070724: Swift detection of a burst
  18. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  19. GRB 070714B: Keck observations
  20. GRB 070721B: optical observations and proposed redshift
  21. GRB 070721B, Further Swift-BAT refined analysis
  22. Swift/UVOT Observations of GRB070721A
  23. GRB 070721B : Faulkes Telescope South observations
  24. GRB 070721B: Swift-XRT refined analysis
  25. GRB 070721A : Faulkes Telescope South optical limit
  26. GRB 070721A: Swift/XRT refined analysis
  27. GRB 070721B, Swift-BAT refined analysis
  28. GRB 070721A, Swift-BAT refined analysis
  29. GRB070721B: A bright UVOT candidate
  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 070714B: confirmation of optical afterglow
  37. GRB 070616: No Evidence for I Band Afterglow
  38. GRB 070714A: Swift XRT refined analysis
  39. GRB070714B: Swift-XRT refined analysis
  40. GRB 070707: Swift-XRT follow-up observations
  41. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  42. GRB 070714A, Swift-BAT refined analysis
  43. GRB 070714 : Liverpool Telescope optical counterpart ?
  44. GRB 070714: Swift detection of a bright burst, possibly short
  45. SN 2007bg - off-axis GRB?
  46. GRB 070704: RTT150 optical observations
  47. GRB 070704: Suzaku/WAM observation of the prompt emission
  48. Konus-Wind observation of GRB 070707
  49. GRB 070707: optical afterglow
  50. Swift/UVOT Observations of GRB070707
  51. Swift XRT observation of GRB 070707
  52. GRB 070707: VLT observations
  53. GRB070704: FAVOR optical observations
  54. GRB 070704 : Liverpool Telescope Observations
  55. GRB 070611: VLT observations
  56. VLA detection of GRB 070612A in C Band
  57. GRB 070704: Swift-XRT refined analysis
  58. Swift/UVOT Observations of GRB070704
  59. GRB 070704, Swift-BAT refined analysis
  60. GRB 070704: Correction to GCN Circ 6594
  61. GRB 070704: Swift detection of a burst
  62. GRB 070626: Suzaku/WAM observation of the prompt emission
  63. GRB 070628 Swift-UVOT Refined Analysis
  64. GRB 070628: NIR detection of afterglow
  65. GRB 070628, Swift-BAT refined analysis
  66. GRB 070628: TAROT La Silla observatory optical observations
  67. Swift UVOT Observations of GRB 070628
  68. OT20050728 was not an optical GRB afterglow
  69. GRB 070616 : WIDGET simultaneous optical observations
  70. GRB 070616: Suzaku/WAM observation of the prompt emission
  71. GRB070621: RTT150 optical observations
  72. GRB 070621: VLT optical observations
  73. GRB 070621: Swift/UVOT Upper Limits
  74. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  75. GRB 070621: Swift-BAT refined analysis
  76. GRB070621: Swift XRT refined analysis
  77. GRB 070621: Gemini South optical imaging
  78. GRB 070621: UVOT-enhanced XRT position
  79. Observations of GRB070612A at Calar Alto
  80. GRB 070621: NOT observations
  81. GRB070621: OPTIMA-Burst optical upper limit
  82. GRB 070621: TAROT Calern observatory optical observations
  83. GRB 070621: Watcher Observations
  84. GRB 070621: Swift detection of a burst
  85. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  86. Swift/UVOT detection of GRB070616 optical afterglow.
  87. GRB 070612A: NOT observations
  88. GRB070616: Optical Observation by MITSuME Okayama
  89. GRB 070616, Swift-BAT further refined analysis
  90. GRB 070616: BTA optical observations
  91. GRB 070616: TLS observation
  92. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  93. GRB 070616: Swift detection of a burst
  94. GRB 070612B: optical observations
  95. UVOT Observations of INTEGRAL burst GRB070615
  96. VLA upper limit on GRB 070610
  97. GRB 070615
  98. SWIFT J195509.6+261406 (GRB 070610): further observations
  99. GRB 070612A: Super-LOTIS observations
  100. GRB 070612A: Rapid Decay

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