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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"

26358 results found.

  1. GRB 070729, Swift-BAT refined analysis
  2. GRB 070724B: P60 Observations
  3. GRB 070724B: Swift/UVOT Upper limits
  4. GRB 070724B: Swift-XRT afterglow likely candidate
  5. GRB 070721A: optical observations
  6. GRB 070724A: further VLT observations
  7. GRB 070724B: Suzaku WAM observation of the prompt emission
  8. GRB 070724B: Swift-XRT afterglow candidates
  9. Four radio sources in Swift-XRT error box of GRB 070724
  10. GRB 070724: P60 and Gemini Observations
  11. GRB 060814 - Keck host detection and redshift
  12. Swift/UVOT refined analysis of GRB070724
  13. GRB 070724: Swift-XRT Team refined analysis
  14. GRB 070724, Swift-BAT refined analysis of a short burst
  15. GRB 070721B: further observations and analysis
  16. GRB 070724: Swift detection of a burst
  17. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  18. GRB 070714B: Keck observations
  19. GRB 070721B: optical observations and proposed redshift
  20. GRB 070721B, Further Swift-BAT refined analysis
  21. Swift/UVOT Observations of GRB070721A
  22. GRB 070721B : Faulkes Telescope South observations
  23. GRB 070721B: Swift-XRT refined analysis
  24. GRB 070721A : Faulkes Telescope South optical limit
  25. GRB 070721A: Swift/XRT refined analysis
  26. GRB 070721B, Swift-BAT refined analysis
  27. GRB 070721A, Swift-BAT refined analysis
  28. GRB070721B: A bright UVOT candidate
  29. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  30. GRB 070714B : Suzaku WAM observation of the prompt emission
  31. GRB070714B: TNG NIR observations
  32. Erratum : Suzaku WAM observation of GRB 070704
  33. GRB 070714A: Swift/UVOT Upper limits
  34. GRB 070714B: Swift/UVOT Upper Limits
  35. GRB 070714B: confirmation of optical afterglow
  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, Swift-BAT refined analysis of the short hard burst
  41. GRB 070714A, Swift-BAT refined analysis
  42. GRB 070714 : Liverpool Telescope optical counterpart ?
  43. GRB 070714: Swift detection of a bright burst, possibly short
  44. SN 2007bg - off-axis GRB?
  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. Swift/UVOT Observations of GRB070707
  50. Swift XRT observation of GRB 070707
  51. GRB 070707: VLT observations
  52. GRB070704: FAVOR optical observations
  53. GRB 070704 : Liverpool Telescope Observations
  54. GRB 070611: VLT observations
  55. VLA detection of GRB 070612A in C Band
  56. GRB 070704: Swift-XRT refined analysis
  57. Swift/UVOT Observations of GRB070704
  58. GRB 070704, Swift-BAT refined analysis
  59. GRB 070704: Correction to GCN Circ 6594
  60. GRB 070704: Swift detection of a burst
  61. GRB 070626: Suzaku/WAM observation of the prompt emission
  62. GRB 070628 Swift-UVOT Refined Analysis
  63. GRB 070628: NIR detection of afterglow
  64. GRB 070628, Swift-BAT refined analysis
  65. GRB 070628: TAROT La Silla observatory optical observations
  66. Swift UVOT Observations of GRB 070628
  67. OT20050728 was not an optical GRB afterglow
  68. GRB 070616 : WIDGET simultaneous optical observations
  69. GRB 070616: Suzaku/WAM observation of the prompt emission
  70. GRB070621: RTT150 optical observations
  71. GRB 070621: VLT optical observations
  72. GRB 070621: Swift/UVOT Upper Limits
  73. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  74. GRB 070621: Swift-BAT refined analysis
  75. GRB070621: Swift XRT refined analysis
  76. GRB 070621: Gemini South optical imaging
  77. GRB 070621: UVOT-enhanced XRT position
  78. Observations of GRB070612A at Calar Alto
  79. GRB 070621: NOT observations
  80. GRB070621: OPTIMA-Burst optical upper limit
  81. GRB 070621: TAROT Calern observatory optical observations
  82. GRB 070621: Watcher Observations
  83. GRB 070621: Swift detection of a burst
  84. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  85. Swift/UVOT detection of GRB070616 optical afterglow.
  86. GRB 070612A: NOT observations
  87. GRB070616: Optical Observation by MITSuME Okayama
  88. GRB 070616, Swift-BAT further refined analysis
  89. GRB 070616: BTA optical observations
  90. GRB 070616: TLS observation
  91. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  92. GRB 070616: Swift detection of a burst
  93. GRB 070612B: optical observations
  94. UVOT Observations of INTEGRAL burst GRB070615
  95. VLA upper limit on GRB 070610
  96. GRB 070615
  97. SWIFT J195509.6+261406 (GRB 070610): further observations
  98. GRB 070612A: Super-LOTIS observations
  99. GRB 070612A: Rapid Decay
  100. GRB 070612A: Suzaku/WAM observation of the prompt emission

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