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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"

41077 results found.

  1. GRB 080319A: Swift detection of a burst
  2. GRB080310, LBT and MDM photometry
  3. GRB080315: Bok Optical Observations
  4. Swift trigger 306323: Swift-BAT/XRT refined analysis
  5. SAX J1818.6-1703: Swift detection (trigger 306379)
  6. GRB 080315: Optical observations
  7. GRB 080315: TAROT Calern observatory optical observations
  8. GRB 080315: Swift detection of a possible burst
  9. GRB080310 : Lulin Optical observations
  10. GRB080310, unusual slow decay in the optical
  11. GRB 080310: GAO 150cm telescope Optical Observation
  12. GRB080310 : Optical observations by LOAO and Lulin
  13. GRB 080310: ROTSE-III Observations of Optical Counterpart
  14. GRB080310: Optical observation by MITSuME telescope
  15. GRB080310, optical observations with the LBT
  16. GRB 080307: GAO 150cm telescope Optical Observation
  17. GRB 080229A: GAO 150cm telescope Optical Observation
  18. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  19. GRB 080307: NIR upper limit
  20. GRB 080229: NIR upper limit
  21. GRB 080310: early RAPTOR multicolor observations
  22. GRB 080310, Swift-BAT refined analysis
  23. GRB080210: optical observations
  24. GRB080307: optical upper limit
  25. GRB 080310: Swift-XRT refined analysis
  26. GRB 080310: Swift/UVOT Refined Analysis
  27. GRB 080310: Redshift from Keck/DEIMOS Spectra
  28. GRB 080310 - SDSS Pre-Burst Observations
  29. GRB080310 : Lulin optical observation
  30. GRB 080310: Enhanced Swift-XRT position
  31. GRB 080310: RRM optical photometry with the VLT
  32. GRB080310, detection of break in optical
  33. GRB 080310: VLT/UVES spectroscopy
  34. GRB080310, optical observations with LBT
  35. GRB 080310: Lick/Kast Spectroscopy
  36. GRB 080310, SMARTS optical/IR afterglow observations
  37. GRB 080310: Magellan redshift
  38. GRB 080310: Swift detection of a burst with optical afterglow
  39. GRB080229, optical upper limit (Correction)
  40. GRB080307, optical upper limit
  41. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  42. GRB080229, optical upper limit
  43. GRB 080307: Swift-XRT Team refined analysis
  44. GRB 080307: Early RAPTOR Limits
  45. GRB 080307, Swift-BAT refined analysis
  46. GRB080307 - SDSS Pre-Burst Observations
  47. GRB 080307: TNT optical observation
  48. GRB080307: Optical upper limits
  49. GRB 080307: Gemini-N i-band observations - candidate afterglow
  50. GRB 080307: retraction of UVOT candidate
  51. GRB 080307: Enhanced Swift-XRT position
  52. GRB 080307, Preliminary Swift-BAT refined analysis
  53. GRB 080307 : BOAO optical afterglow observation
  54. GRB 080307: Optical observation with DMC/KANATA
  55. GRB 080307: Swift detection of a burst
  56. GRB 080303: Swift/UVOT follow-up of afterglow detection
  57. GRB 080303, Swift-BAT refined analysis
  58. GRB 080303: Rapid PROMPT Detections
  59. GRB080303: Swift XRT refined analysis
  60. GRB 080303: Enhanced Swift-XRT position
  61. Swift UVOT observations of GRB080229B
  62. GRB080229B: Swift XRT afterglow observation
  63. GRB 080303A: Faulkes Telescope South optical afterglow observations
  64. GRB 080303
  65. GRB 080303: Swift detection of a burst with optical afterglow
  66. GRB 080303: REM NIR afterglow candidate
  67. GRB 080303A: ROTSE-III Optical Limits
  68. GRB 080229: I-band observations from OSN
  69. GRB 080229: VLT NIR observations
  70. GRB080229: Swift XRT refined analysis
  71. GRB 080229: TNG NIR observations
  72. GRB 080229: Deep Gemini/GMOS optical observations
  73. GRB 080229: Enhanced Swift-XRT position
  74. GRB080229: Possible optical afterglow
  75. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  76. UVOT analysis for GRB080229
  77. GRB 080229, Swift-BAT refined analysis
  78. GRB 080229: Faulkes Telescope South optical limit
  79. GRB 080229A: ROTSE-III Optical Limits
  80. GRB 080229: Swift detection of a bright burst
  81. Early optical shallow decay in GRB 071112C
  82. GRB080207: optical observations
  83. GRB080205: optical observations
  84. GRB080211: optical observations
  85. GRB 071010B : Early optical brightening detected by TAOS
  86. Swift-XRT improved positions, and new redshift limits.
  87. ESO optical and NIR observations of GRB 080218B
  88. GRB 080204: Suzaku WAM observation of the prompt emission
  89. GRB 080218B, Swift-BAT refined analysis
  90. GRB 080218B: Swift-XRT refined analysis
  91. GRB 080212: Mount Abu NIR observations
  92. GRB 080218B: Enhanced Swift-XRT position
  93. GRB 080218B: GROND upper limits
  94. GRB 080218b, SMARTS optical/IR limits
  95. GRB 080218A, Swift-BAT refined analysis
  96. GRB 080211: Suzaku WAM observation of the prompt emission
  97. GRB 080218B: Swift detection of a burst
  98. GRB 080218: Swift detection of a burst
  99. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  100. GRB 080212: VLT optical rapid decay

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