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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"

28094 results found.

  1. GRB 070809: Swift-XRT refined analysis
  2. GRB 070810: enhanced Swift-XRT position
  3. GRB 070810: Swift/UVOT Optical Counterpart
  4. GRB 070809, Swift-BAT refined analysis
  5. GRB 070808: Swift/UVOT upper limits
  6. GRB 070809: Swift detection of a short burst
  7. GRB 070808 : Faulkes Telescope South Observations
  8. GCN Swift XRT update position notices and enhanced position circulars
  9. GRB 070808: Swift XRT refined analysis
  10. GRB 070808, Swift-BAT refined analysis
  11. GRB 070808: OPTIMA-Burst optical upper limit
  12. GRB 070808: Xinglong TNT optical Upper Limit
  13. GRB070808: Optical observations with KANATA
  14. GRB070808 - SDSS Pre-Burst Observations
  15. GRB 070808: ROTSE-III Optical Limits
  16. GRB070805 XRT and UVOT afterglow candidate
  17. GRB070612A: Radio upper limit from GMRT
  18. GRB 070721B: correct afterglow position
  19. Swift/UVOT observations of GRB070805
  20. GRB 070805, Swift-BAT refined analysis
  21. UVOT observations of SAXJ1810.8-2609
  22. Swift detection of a outburst from SAX J1810.8-2609
  23. VLA non-detection of GRB 070721B
  24. GRB 070802: REM optical observations
  25. GRB 070802: Swift-XRT refined analysis
  26. GRB070802: Swift/UVOT upper limits
  27. GRB 070802, Swift-BAT refined analysis
  28. GRB 070802: V-band detection of the candidate afterglow
  29. GRB 070802: GROND J band candidate
  30. GRB 070731, Swift-BAT refined analysis
  31. Konus-A observation of GRB 070729
  32. Swift/UVOT detection of GRB070714B
  33. VLA upper limit on short hard burst GRB 070714B
  34. Intense burst from SGR 1806-20 detected on July 27
  35. GRB070729: Swift/UVOT upper limits
  36. GRB 070729: Swift-XRT refined analysis
  37. GRB 070729, Swift-BAT refined analysis
  38. GRB 070724B: P60 Observations
  39. GRB 070724B: Swift/UVOT Upper limits
  40. GRB 070724B: Swift-XRT afterglow likely candidate
  41. GRB 070721A: optical observations
  42. GRB 070724A: further VLT observations
  43. GRB 070724B: Suzaku WAM observation of the prompt emission
  44. GRB 070724B: Swift-XRT afterglow candidates
  45. Four radio sources in Swift-XRT error box of GRB 070724
  46. GRB 070724: P60 and Gemini Observations
  47. GRB 060814 - Keck host detection and redshift
  48. Swift/UVOT refined analysis of GRB070724
  49. GRB 070724: Swift-XRT Team refined analysis
  50. GRB 070724, Swift-BAT refined analysis of a short burst
  51. GRB 070721B: further observations and analysis
  52. GRB 070724: Swift detection of a burst
  53. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  54. GRB 070714B: Keck observations
  55. GRB 070721B: optical observations and proposed redshift
  56. GRB 070721B, Further Swift-BAT refined analysis
  57. Swift/UVOT Observations of GRB070721A
  58. GRB 070721B : Faulkes Telescope South observations
  59. GRB 070721B: Swift-XRT refined analysis
  60. GRB 070721A : Faulkes Telescope South optical limit
  61. GRB 070721A: Swift/XRT refined analysis
  62. GRB 070721B, Swift-BAT refined analysis
  63. GRB 070721A, Swift-BAT refined analysis
  64. GRB070721B: A bright UVOT candidate
  65. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  66. GRB 070714B : Suzaku WAM observation of the prompt emission
  67. GRB070714B: TNG NIR observations
  68. Erratum : Suzaku WAM observation of GRB 070704
  69. GRB 070714A: Swift/UVOT Upper limits
  70. GRB 070714B: Swift/UVOT Upper Limits
  71. GRB 070714B: confirmation of optical afterglow
  72. GRB 070616: No Evidence for I Band Afterglow
  73. GRB 070714A: Swift XRT refined analysis
  74. GRB070714B: Swift-XRT refined analysis
  75. GRB 070707: Swift-XRT follow-up observations
  76. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  77. GRB 070714A, Swift-BAT refined analysis
  78. GRB 070714 : Liverpool Telescope optical counterpart ?
  79. GRB 070714: Swift detection of a bright burst, possibly short
  80. SN 2007bg - off-axis GRB?
  81. GRB 070704: RTT150 optical observations
  82. GRB 070704: Suzaku/WAM observation of the prompt emission
  83. Konus-Wind observation of GRB 070707
  84. GRB 070707: optical afterglow
  85. Swift/UVOT Observations of GRB070707
  86. Swift XRT observation of GRB 070707
  87. GRB 070707: VLT observations
  88. GRB070704: FAVOR optical observations
  89. GRB 070704 : Liverpool Telescope Observations
  90. GRB 070611: VLT observations
  91. VLA detection of GRB 070612A in C Band
  92. GRB 070704: Swift-XRT refined analysis
  93. Swift/UVOT Observations of GRB070704
  94. GRB 070704, Swift-BAT refined analysis
  95. GRB 070704: Correction to GCN Circ 6594
  96. GRB 070704: Swift detection of a burst
  97. GRB 070626: Suzaku/WAM observation of the prompt emission
  98. GRB 070628 Swift-UVOT Refined Analysis
  99. GRB 070628: NIR detection of afterglow
  100. GRB 070628, Swift-BAT refined analysis

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