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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"

11121 results found.

  1. GRB 100621A: ROTSE-III Optical Limits
  2. GRB 100606A: Optical Limits
  3. GRB 100619A: Swift-BAT refined analysis
  4. GRB 100619A: Swift detection of a burst
  5. XRF 100616a : MAXI/GSC detection of a probable XRF
  6. GRB 100615A: Swift-XRT refined analysis
  7. GRB 100614A: Swift-XRT refined analysis
  8. GRB 100615A: GROND observations, upper limits
  9. GRB 100615A: Swift detection of a burst
  10. GRB 100614A: Swift detection of a burst
  11. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  12. Konus-Wind observation of GRB 100606A
  13. GRB 100606A Swift-XRT refined analysis
  14. GRB 100606A: Swift-BAT refined analysis
  15. GRB 100513A: CrAO optical observations
  16. Konus-Wind observation of GRB 100528A
  17. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  18. GRB 100528A: SuperAGILE Localization of a Long GRB
  19. GRB 100526A: Swift XRT refined analysis
  20. GRB 100526B: Swift XRT/UVOT observations
  21. GRB 100526A: Swift-BAT refined analysis
  22. GRB 100526A: Swift detection of a burst
  23. Konus-Wind observation of GRB 100522A
  24. GRB 100522A: Swift XRT refined analysis
  25. GRB 100522A: NIR observations from CAHA
  26. GRB 100522A: Swift detection of a burst
  27. GRB 100518A: Swift-XRT refined analysis
  28. Update to the configuration of the Fermi-LAT onboard GRB search
  29. GRB 100518A: Faulkes Telescope North Afterglow Candidate
  30. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  31. GRB 100518A: a long GRB detected with INTEGRAL
  32. Swift Trigger 422437 is probably not a GRB
  33. GRB 100513A: EVLA radio observation
  34. GRB 100514A: Swift XRT refined analysis
  35. GRB 100514A: MASTER-Net optical observations
  36. GRB 100514A: Swift detection of a burst
  37. GRB 100513A: Swift XRT refined analysis
  38. GRB 100513A: Swift detection of a burst
  39. GRB 100511A, RIMOTS optical upper limits
  40. GRB 100508A: Swift-XRT Refined analysis
  41. GRB 100508A: Swift-BAT refined analysis
  42. GRB 100508A: ROTSE-III Optical Limits
  43. GRB 100508A: Swift detection of a burst
  44. GRB 100504A: Fermi GBM observation
  45. GRB 100504A: GROND Upper limits
  46. GRB 100504A: SARA-South Upper Limit
  47. GRB 100504A: Swift detection of a burst
  48. INTEGRAL observations of Swift GRB trigger 421072
  49. GRB 100420A: Gemini discovery of infrared afterglow
  50. GRB 100420A: Terskol optical upper limit
  51. GRB 100418A: RTT150 optical observations
  52. Konus-Wind observation of GRB 100423A
  53. GRB 100418A: Terskol optical observations
  54. GRB 100425A: Swift XRT refined analysis
  55. GRB 100424A: Liverpool Telescope Upper Limits
  56. GRB 100425A: GROND afterglow observation
  57. GRB 100424A: D50 optical limits
  58. GRB 100424A: GROND Upper Limits
  59. GRB 100424A: Swift-XRT refined analysis
  60. GRB 100425A: Swift detection of a burst
  61. GRB 100424A, Swift-BAT refined analysis
  62. GRB 100420A: GRT Optical Observation
  63. GRB 100418A: ROVOR optical measurements at 35 hours
  64. Swift Trigger 420256: ROTSE-III Optical Limits
  65. Radio afterglow detection of GRB 100418A with the EVLA
  66. GRB 100418A: Continued PAIRITEL NIR Observations
  67. GRB 100418A: WSRT Radio Detection
  68. GRB 100418A: RTT150 optical observations
  69. GRB100420A: MITSuME optical upper limits
  70. GRB 100414A: CFHT optical observations
  71. GRB 100420A: SARA Upper Limits
  72. GRB 100418A: RTT150 observations during the optical afterglow maximum
  73. GRB 100418A: SMA submm detection
  74. GRB 100420A: ROTSE-III Optical Limits
  75. GRB 100418A: Swift-XRT Refined Analysis
  76. GRB100414A: SAO RAS optical observations
  77. GRB 100418A: ROTSE-III Optical Limits
  78. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  79. GRB 100414A: Suzaku WAM observation of the prompt emission
  80. Konus-Wind observation of GRB 100414B
  81. GRB 100415A: MAXI/GSC detection of a probable GRB
  82. GRB 100414A: Fermi GBM detection
  83. GRB100414A: Fermi LAT detection
  84. Konus-Wind observation of GRB 100413A
  85. Tentative redshift of GRB100413A from X-ray data
  86. GRB 100413A: Swift-XRT Refined Analysis
  87. GRB 100413: xinglong TNT optical upper limit
  88. GRB 100413A: MASTER-Net optical observations
  89. GRB 100413A: Swift detection of a burst
  90. GRB100401A: GROND Upper Limits
  91. MASTER observations on the Swift second trigger on LS V +44 17
  92. GRB 100331B: Swift/XRT possible afterglow candidate
  93. GRB 100331B: SuperAGILE Localization of a Long GRB
  94. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  95. Konus-Wind observation of GRB 100324B
  96. GRB 100331A: A long GRB detected by INTEGRAL
  97. Konus-Wind observation of GRB 100322A
  98. Short X-ray Transient detected by MAXI/GSC
  99. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  100. GRB 100325A: Fermi LAT detection

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