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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"

26500 results found.

  1. GRB 070802: LCO I-band candidate
  2. GRB 070802: GROND J band candidate
  3. GRB 070802: LCO optical observations
  4. Konus-A observation of GRB 070729
  5. Swift/UVOT detection of GRB070714B
  6. VLA upper limit on short hard burst GRB 070714B
  7. GRB070729: Swift/UVOT upper limits
  8. GRB 070729: Swift-XRT refined analysis
  9. GRB 070724B: P60 Observations
  10. GRB 070724B: Swift/UVOT Upper limits
  11. GRB 070724B: Swift-XRT afterglow likely candidate
  12. GRB 070721A: optical observations
  13. GRB 070724A: further VLT observations
  14. GRB 070724B: Suzaku WAM observation of the prompt emission
  15. Konus-Wind observation of GRB 070724B
  16. GRB 070724B: Swift-XRT afterglow candidates
  17. Four radio sources in Swift-XRT error box of GRB 070724
  18. GRB 070724: P60 and Gemini Observations
  19. GRB 060814 - Keck host detection and redshift
  20. GRB 070724: Closer association with DSS source
  21. Swift/UVOT refined analysis of GRB070724
  22. GRB 070724: Swift-XRT Team refined analysis
  23. GRB 070721B: further observations and analysis
  24. GRB 070724: Swift detection of a burst
  25. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  26. GRB 070714B: Keck observations
  27. GRB 070721B: optical observations and proposed redshift
  28. GRB 070721B, Further Swift-BAT refined analysis
  29. Swift/UVOT Observations of GRB070721A
  30. GRB 070721B : Faulkes Telescope South observations
  31. GRB 070721B: Swift-XRT refined analysis
  32. GRB 070721A : Faulkes Telescope South optical limit
  33. GRB 070721A: Swift/XRT refined analysis
  34. GRB070721B: A bright UVOT candidate
  35. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  36. GRB 070714B : Suzaku WAM observation of the prompt emission
  37. GRB070714B: TNG NIR observations
  38. Erratum : Suzaku WAM observation of GRB 070704
  39. GRB 070714A: Swift/UVOT Upper limits
  40. GRB 070714B: Swift/UVOT Upper Limits
  41. GRB 070714B: confirmation of optical afterglow
  42. GRB 070616: No Evidence for I Band Afterglow
  43. GRB 070714A: Swift XRT refined analysis
  44. GRB070714B: Swift-XRT refined analysis
  45. GRB 070707: Swift-XRT follow-up observations
  46. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  47. GRB 070714A, Swift-BAT refined analysis
  48. GRB 070714 : Liverpool Telescope optical counterpart ?
  49. GRB 070714: Swift detection of a bright burst, possibly short
  50. SN 2007bg - off-axis GRB?
  51. GRB 070704: RTT150 optical observations
  52. GRB 070704: Suzaku/WAM observation of the prompt emission
  53. Konus-Wind observation of GRB 070707
  54. GRB 070707: optical afterglow
  55. Swift/UVOT Observations of GRB070707
  56. Swift XRT observation of GRB 070707
  57. GRB 070707: VLT observations
  58. GRB 070429B: NIR Observations
  59. GRB070704: FAVOR optical observations
  60. GRB 070704 : Liverpool Telescope Observations
  61. GRB 070611: VLT observations
  62. VLA detection of GRB 070612A in C Band
  63. GRB 070704: Swift-XRT refined analysis
  64. Swift/UVOT Observations of GRB070704
  65. GRB 070704: Correction to GCN Circ 6594
  66. GRB 070704: Swift detection of a burst
  67. GRB 070626: Suzaku/WAM observation of the prompt emission
  68. GRB 070628 Swift-UVOT Refined Analysis
  69. GRB 070628: NIR detection of afterglow
  70. GRB 070628, Swift-BAT refined analysis
  71. GRB 070628: TAROT La Silla observatory optical observations
  72. GRB 070628: Swift XRT refined analysis
  73. GRB 070616 : WIDGET simultaneous optical observations
  74. GRB 070616: Suzaku/WAM observation of the prompt emission
  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. GRB070621: Swift XRT refined analysis
  80. GRB 070621: Gemini South optical imaging
  81. GRB 070621: UVOT-enhanced XRT position
  82. Observations of GRB070612A at Calar Alto
  83. GRB 070621: NOT observations
  84. GRB070621: OPTIMA-Burst optical upper limit
  85. GRB 070621: TAROT Calern observatory optical observations
  86. GRB 070621: Watcher Observations
  87. GRB 070621: Swift detection of a burst
  88. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  89. Swift/UVOT detection of GRB070616 optical afterglow.
  90. GRB070616: Optical Observation by MITSuME Okayama
  91. GRB 070616, Swift-BAT further refined analysis
  92. GRB 070616: Swift XRT refined circular
  93. GRB 070616: TLS observation
  94. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  95. GRB 070616: Swift detection of a burst
  96. GRB 070612B: optical observations
  97. UVOT Observations of INTEGRAL burst GRB070615
  98. VLA upper limit on GRB 070610
  99. GRB 070615
  100. GRB 070615: A long GRB detected by INTEGRAL

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