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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"

11404 results found.

  1. GRB 080702A: MITSuME Akeno optical upper limits
  2. Swift Trigger 315630: Probably not a GRB
  3. GRB 080701A: Early Super-LOTIS Observations
  4. GRB 080701A, Swift-BAT refined analysis
  5. GRB 080625: Gamma Ray Burst Localization by SuperAGILE
  6. GRB 070809: Putative host galaxy and redshift
  7. Konus-Wind observation of GRB 080613B
  8. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  9. GRB 080613 : a long GRB detected with INTEGRAL
  10. GRB 080603b: optical observation
  11. GRB080605: optical observation with the MITSuME-OAO telescope
  12. Konus-Wind observation of GRB 080607
  13. GRB 080607: Swift-XRT refined analysis
  14. Konus-Wind observation of GRB 080605
  15. GRB 080607: Keck/LRIS spectroscopy and redshift
  16. GRB 080605, Swift-BAT refined analysis
  17. GRB 080605, Swift-BAT refined analysis
  18. GRB 080605: MASTER VWF 46 s AT observation
  19. Swift/UVOT observations of GRB080604
  20. Konus-Wind observation of GRB 080603B
  21. GRB 080603B, Swift-BAT refined analysis
  22. GRB 080603A: Swift/UVOT detection of the afterglow
  23. GRB080603B: RTT150 optical observations, break in light curves
  24. GRB 080604: Early Super-LOTIS Observations
  25. GRB080604: confirmation of optical afterglow
  26. GRB 080604: Swift detection of a burst with an optical afterglow
  27. GRB 080516: TAROT La Silla observatory optical observations
  28. GRB 080603B: BOOTES2/TELMA optical observations
  29. GRB 080603: A long GRB detected by INTEGRAL
  30. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  31. Konus-Wind observation of GRB 080602
  32. Swift analysis of BAT Slew Survey event (Trigger=009)
  33. Konus-Wind observation of reactivation of SGR 1627-41
  34. Reactivation of SGR 1627-41
  35. GRB 080515: KPNO 4m NIR afterglow detection
  36. GRB 080515: Swift-XRT position and analysis
  37. GRB 080520, GROND observations
  38. GRB 080520: Swift XRT Refined Analysis
  39. GRB 080520: Swift detection of a burst with optical afterglow
  40. Konus-Wind observation of GRB 080514B
  41. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  42. GRB 080517: Swift detection of a burst
  43. GRB 080516: Swift detection of a burst
  44. Konus-Wind observation of GRB 080513
  45. IPN triangulation of bright GRB 080513
  46. GRB 080514B: KPNO 4m IR observations
  47. GRB 080514B: slow fading behaviour ?
  48. GRB 080514B: Swift-XRT analysis
  49. GRB 080514B: SuperAGILE/IPN GRB Localization
  50. Konus-Wind observation of GRB 080507
  51. GRB 080507: E Pur Si Muove!
  52. GRB 080503: Hubble Space Telescope Imaging
  53. GRB 080506:Optical observations from HCT
  54. GRB 080507: GRB localization by SuperAGILE
  55. GRB 080506, Swift-BAT refined analysis
  56. GRB 080503, Swift-BAT refined analysis
  57. GRB 080430
  58. GRB 080430
  59. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  60. GRB 080503: Swift detection of a short burst
  61. GRB 080430 optical observations
  62. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  63. GRB 080430: Bootes observation
  64. GRB 080430: Swift detection of a burst with optical afterglow
  65. GRB 080320 : Faulkes Telescope North Observations
  66. Swift-BAT trigger 309665 is not a GRB
  67. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  68. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  69. GRB 080414: RTT150 optical observations
  70. GRB 080414: A long GRB detected by INTEGRAL
  71. GRB 080413B: Swift XRT refined analysis
  72. GRB 080413B, Swift-BAT refined analysis
  73. GRB 080413A: Swift-XRT refined analysis
  74. GRB 080413A Bootes observation
  75. GRB 080411: Swift-XRT Refined Analysis
  76. Konus-Wind observation of GRB 080411
  77. GRB 080411: Swift detection of a bright burst
  78. GRB 080330 optical observations
  79. GRB 080408: GRB Localization by SuperAGILE
  80. GRB 080405: Swift-BAT refined analysis
  81. GRB 080330, SMARTS optical/IR afterglow observations
  82. Konus-Wind observation of GRB 080328
  83. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  84. GRB 080325, Swift-BAT refined analysis
  85. GRB 080325: GROND Observations
  86. GRB080319B: optical observations
  87. GRB 080325: Early observations from OSN
  88. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  89. GRB 080319D: optical upper limit
  90. GRB 080319B - CARMA mm Observations
  91. GRB 080320: J detection with FLAMINGOS
  92. GRB 080319D: Swift XRT refined analysis
  93. Konus-Wind observation of GRB 080319C
  94. GRB 080319B: Gemini-South photometry
  95. GRB 080319B: Allen Telescope Array Observations
  96. Konus-Wind observation of GRB 080319B
  97. GRB 080319B: WSRT Radio Observations
  98. GRB 080320: Swift detection of a burst
  99. GRB 080320: ROTSE-III Optical Limits
  100. GRB 080319C: Swift detection of a burst with an optical afterglow

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