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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"

35340 results found.

  1. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  2. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  3. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  4. GRB 080905A: Enhanced Swift-XRT position
  5. GRB 080905A: MITSuME Akeno optical upper limits
  6. Swift Trigger 324116 is known source again
  7. Swift Trigger 324112 is known source Swift J1842.5-1124
  8. GRB 080906: Refined Swift/UVOT Observations
  9. GRB 080906: Swift-XRT Refined Analysis
  10. GRB 080906, Swift-BAT refined analysis
  11. GRB 080905A: optical afterglow
  12. GRB 080906: GROND observations of the optical/NIR afterglow
  13. GRB 080905B: Swift-XRT Refined Analysis
  14. GRB 080905B: Refined UVOT Analysis
  15. GRB 080905B: VLT redshift
  16. GRB 080905A: NOT and VLT observations
  17. GRB 080905B: Enhanced Swift-XRT position
  18. GRB 080905B, Swift-BAT refined analysis
  19. GRB 080905A, Swift-BAT refined analysis
  20. GRB 080906: Swift detection of a burst with optical afterglow
  21. GRB 080905A: Swift-XRT Refined Analysis
  22. GRB 080825C: Fermi GBM Spectral Analysis
  23. GRB 080905B: Swift detection of a burst with possible optical counterpart
  24. GRB 080905: R & I-band optical observations
  25. GRB 080905: Swift detection of a probably-short burst
  26. GRB 080903: Swift/UVOT Observations
  27. GRB 080903: Swift-XRT Refined Analysis
  28. GRB 080903: Enhanced Swift-XRT position
  29. GRB 080903, Swift-BAT refined analysis
  30. GRB 080903: optical observations
  31. GRB 080903: Liverpool Telescope observations
  32. GRB 080903: Astrotel-Caucasus optical observations
  33. GRB 080903: Optical afterglow candidate
  34. GRB 080903: TAROT Calern observatory optical observations
  35. GRB 080903: ROTSE-III Optical Limits
  36. GRB 080903: Swift detection of a burst
  37. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  38. GRB080828: Swift/UVOT Upper Limits
  39. GRB080825B: Swift/UVOT Upper Limits
  40. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  41. Swift-BAT trigger 322590 is not a GRB
  42. Swift trigger 322590: BAT detection of a possible burst
  43. GRB 080828: SuperAGILE GRB Localization
  44. GRB080823: Fermi Gamma-ray Burst Monitor detection
  45. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  46. GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum
  47. Konus-Wind observation of GRB 080825B
  48. GRB080825C: GLAST Burst Monitor detection
  49. GRB 080825B: Swift-XRT team analysis
  50. GRB080825: Afterglow confirmation and redshift estimate
  51. GRB 080825B - optical counterpart candidate
  52. GRB 080825B: GRB Localization by SuperAGILE
  53. GRB 080822B, Swift-BAT refined analysis
  54. GRB 080822B: MASTER optical observation
  55. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  56. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  57. GRB 080822B: Swift detection of a burst
  58. GRB080818B: GLAST Burst Monitor detection
  59. GRB 080822 (SGR 0501+4516): archival optical observations
  60. New Soft Gamma Repeater 0501+4516 was GRB 080822
  61. GRB 080822: Swift detection of a short burst
  62. GLAST Burst Monitor detection of a GRB: 080816B
  63. GLAST Burst Monitor detection of GRB 080818
  64. GLAST Burst Monitor detection of GRB080817B
  65. GLAST Burst Monitor detection of GRB 080817
  66. GLAST Burst Monitor detection of GRB080816
  67. GRB080810 - optical observations
  68. GRB080810: optical observations
  69. GLAST Burst Monitor detection of GRB 080812
  70. Radio detection of GRB 080810 with the VLA
  71. GRB 080810: RTT150 optical observations
  72. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  73. GLAST Burst Monitor detection of GRB 080810
  74. GRB 080810: Liverpool and Faulkes North observations
  75. GRB 080810: RTT150 optical observations
  76. GRB080810: MITSuME optical observation
  77. First GLAST Burst Monitor GRB Circulars
  78. GRB 080810: Swift/UVOT Refined Analysis
  79. GRB 080810: optical observations
  80. GRB 080810: Liverpool Telescope observations
  81. GRB 080810: D50 optical observation
  82. GRB 080810: Kanazawa optical observation
  83. GRB 080810: OSN follow-up
  84. GRB 080810: Observations from NOT
  85. GRB 080810: RTT150 optical observations
  86. GRB 080810: Swift-XRT Team refined analysis
  87. GRB 080810: Enhanced Swift-XRT position
  88. GRB 080810: KANATA optical-NIR observation, update
  89. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  90. GRB 080810: Keck/HIRES Spectroscopy
  91. GRB 080810, Swift-BAT refined analysis
  92. GRB 080810 : optical observation with KANATA
  93. GRB 080810: Swift detection of a burst with a bright optical afterglow
  94. GRB 080723B: GROND upper limits
  95. GRB 080723B: XMM-Newton observation
  96. GRB 080805: VLT redshift update
  97. GRB 080805: Faulkes Telescope South optical observations
  98. GRB 080804: GROND observations
  99. GRB 080727B: Late VLT imaging
  100. GRB 080804: ATCA Radio Observations

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