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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"

27391 results found.

  1. GRB 070809, Swift-BAT refined analysis
  2. GRB 070808: Swift/UVOT upper limits
  3. GRB 070809: Swift detection of a short burst
  4. GRB 070808 : Faulkes Telescope South Observations
  5. GCN Swift XRT update position notices and enhanced position circulars
  6. GRB 070808: Swift XRT refined analysis
  7. GRB 070808, Swift-BAT refined analysis
  8. GRB 070808: OPTIMA-Burst optical upper limit
  9. GRB 070808: Xinglong TNT optical Upper Limit
  10. GRB070808: Optical observations with KANATA
  11. GRB070808 - SDSS Pre-Burst Observations
  12. GRB 070808: ROTSE-III Optical Limits
  13. GRB070805 XRT and UVOT afterglow candidate
  14. GRB070612A: Radio upper limit from GMRT
  15. GRB 070721B: correct afterglow position
  16. Swift/UVOT observations of GRB070805
  17. GRB 070805, Swift-BAT refined analysis
  18. UVOT observations of SAXJ1810.8-2609
  19. Swift detection of a outburst from SAX J1810.8-2609
  20. VLA non-detection of GRB 070721B
  21. GRB 070802: REM optical observations
  22. GRB 070802: Swift-XRT refined analysis
  23. GRB070802: Swift/UVOT upper limits
  24. GRB 070802, Swift-BAT refined analysis
  25. GRB 070802: V-band detection of the candidate afterglow
  26. GRB 070802: GROND J band candidate
  27. GRB 070731, Swift-BAT refined analysis
  28. Konus-A observation of GRB 070729
  29. Swift/UVOT detection of GRB070714B
  30. VLA upper limit on short hard burst GRB 070714B
  31. Intense burst from SGR 1806-20 detected on July 27
  32. GRB070729: Swift/UVOT upper limits
  33. GRB 070729: Swift-XRT refined analysis
  34. GRB 070729, Swift-BAT refined analysis
  35. GRB 070724B: P60 Observations
  36. GRB 070724B: Swift/UVOT Upper limits
  37. GRB 070724B: Swift-XRT afterglow likely candidate
  38. GRB 070721A: optical observations
  39. GRB 070724A: further VLT observations
  40. GRB 070724B: Suzaku WAM observation of the prompt emission
  41. GRB 070724B: Swift-XRT afterglow candidates
  42. Four radio sources in Swift-XRT error box of GRB 070724
  43. GRB 070724: P60 and Gemini Observations
  44. GRB 060814 - Keck host detection and redshift
  45. Swift/UVOT refined analysis of GRB070724
  46. GRB 070724: Swift-XRT Team refined analysis
  47. GRB 070724, Swift-BAT refined analysis of a short burst
  48. GRB 070721B: further observations and analysis
  49. GRB 070724: Swift detection of a burst
  50. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  51. GRB 070714B: Keck observations
  52. GRB 070721B: optical observations and proposed redshift
  53. GRB 070721B, Further Swift-BAT refined analysis
  54. Swift/UVOT Observations of GRB070721A
  55. GRB 070721B : Faulkes Telescope South observations
  56. GRB 070721B: Swift-XRT refined analysis
  57. GRB 070721A : Faulkes Telescope South optical limit
  58. GRB 070721A: Swift/XRT refined analysis
  59. GRB 070721B, Swift-BAT refined analysis
  60. GRB 070721A, Swift-BAT refined analysis
  61. GRB070721B: A bright UVOT candidate
  62. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  63. GRB 070714B : Suzaku WAM observation of the prompt emission
  64. GRB070714B: TNG NIR observations
  65. Erratum : Suzaku WAM observation of GRB 070704
  66. GRB 070714A: Swift/UVOT Upper limits
  67. GRB 070714B: Swift/UVOT Upper Limits
  68. GRB 070714B: confirmation of optical afterglow
  69. GRB 070616: No Evidence for I Band Afterglow
  70. GRB 070714A: Swift XRT refined analysis
  71. GRB070714B: Swift-XRT refined analysis
  72. GRB 070707: Swift-XRT follow-up observations
  73. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  74. GRB 070714A, Swift-BAT refined analysis
  75. GRB 070714 : Liverpool Telescope optical counterpart ?
  76. GRB 070714: Swift detection of a bright burst, possibly short
  77. SN 2007bg - off-axis GRB?
  78. GRB 070704: RTT150 optical observations
  79. GRB 070704: Suzaku/WAM observation of the prompt emission
  80. Konus-Wind observation of GRB 070707
  81. GRB 070707: optical afterglow
  82. Swift/UVOT Observations of GRB070707
  83. Swift XRT observation of GRB 070707
  84. GRB 070707: VLT observations
  85. GRB070704: FAVOR optical observations
  86. GRB 070704 : Liverpool Telescope Observations
  87. GRB 070611: VLT observations
  88. VLA detection of GRB 070612A in C Band
  89. GRB 070704: Swift-XRT refined analysis
  90. Swift/UVOT Observations of GRB070704
  91. GRB 070704, Swift-BAT refined analysis
  92. GRB 070704: Correction to GCN Circ 6594
  93. GRB 070704: Swift detection of a burst
  94. GRB 070626: Suzaku/WAM observation of the prompt emission
  95. GRB 070628 Swift-UVOT Refined Analysis
  96. GRB 070628: NIR detection of afterglow
  97. GRB 070628, Swift-BAT refined analysis
  98. GRB 070628: TAROT La Silla observatory optical observations
  99. Swift UVOT Observations of GRB 070628
  100. OT20050728 was not an optical GRB afterglow

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