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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"

28068 results found.

  1. GRB080310, LBT and MDM photometry
  2. GRB080315: Bok Optical Observations
  3. Swift/UVOT observations of GRB 080315
  4. Swift trigger 306323: Swift-BAT/XRT refined analysis
  5. SAX J1818.6-1703: Swift detection (trigger 306379)
  6. GRB 080315: Swift detection of a possible burst
  7. GRB080310 : Lulin Optical observations
  8. GRB080310, unusual slow decay in the optical
  9. GRB080310 : Optical observations by LOAO and Lulin
  10. GRB 080310: ROTSE-III Observations of Optical Counterpart
  11. GRB080310: Optical observation by MITSuME telescope
  12. GRB080310, optical observations with the LBT
  13. GRB 080229A: GAO 150cm telescope Optical Observation
  14. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  15. GRB 080307: NIR upper limit
  16. GRB 080229: NIR upper limit
  17. GRB 080310, Swift-BAT refined analysis
  18. GRB080210: optical observations
  19. GRB080307: optical upper limit
  20. GRB 080310: Swift-XRT refined analysis
  21. GRB 080310: Swift/UVOT Refined Analysis
  22. GRB 080310: Redshift from Keck/DEIMOS Spectra
  23. GRB080310 : Lulin optical observation
  24. GRB 080310: Enhanced Swift-XRT position
  25. GRB 080310: RRM optical photometry with the VLT
  26. GRB080310, detection of break in optical
  27. GRB 080310: VLT/UVES spectroscopy
  28. GRB 080310: Magellan redshift revision
  29. GRB 080310: Lick/Kast Spectroscopy
  30. GRB080310: Super-LOTIS suggestion of brightening
  31. GRB 080310, SMARTS optical/IR afterglow observations
  32. GRB 080310: REM observations
  33. GRB 080310: Magellan redshift
  34. GRB 080310 afterglow candidate (correction to UT time)
  35. GRB 080310: Swift detection of a burst with optical afterglow
  36. GRB 080310 afterglow candidate
  37. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  38. GRB 080307: Swift-XRT Team refined analysis
  39. GRB 080307: Early RAPTOR Limits
  40. GRB 080307: TNT optical observation
  41. GRB080307: Optical upper limits
  42. GRB 080307: Gemini-N i-band observations - candidate afterglow
  43. GRB 080307: BOAO imaging - retraction and new limit
  44. GRB 080307: retraction of UVOT candidate
  45. GRB 080307: Enhanced Swift-XRT position
  46. GRB 080307 : BOAO optical afterglow observation
  47. GRB 080307: Optical observation with DMC/KANATA
  48. GRB 080307: Swift detection of a burst
  49. VLA possible radio detection of GRB 080229
  50. GRB 080303: Swift/UVOT follow-up of afterglow detection
  51. GRB 080303: Rapid PROMPT Detections
  52. GRB080303: Swift XRT refined analysis
  53. GRB 080303: Enhanced Swift-XRT position
  54. Swift UVOT observations of GRB080229B
  55. GRB080229B: Swift XRT afterglow observation
  56. GRB 080303A: Faulkes Telescope South optical afterglow observations
  57. GRB 080303
  58. GRB 080303: Swift detection of a burst with optical afterglow
  59. GRB 080303: REM NIR afterglow candidate
  60. GRB 080303A: ROTSE-III Optical Limits
  61. GRB 080229: I-band observations from OSN
  62. GRB 080229: VLT NIR observations
  63. GRB080229: Swift XRT refined analysis
  64. GRB 080229: TNG NIR observations
  65. GRB 080229: Deep Gemini/GMOS optical observations
  66. GRB 080229: Enhanced Swift-XRT position
  67. GRB 080229: REM NIR observations
  68. GRB080229: Possible optical afterglow
  69. UVOT analysis for GRB080229
  70. GRB 080229: Faulkes Telescope South optical limit
  71. GRB 080229A: ROTSE-III Optical Limits
  72. GRB 080229: Swift detection of a bright burst
  73. Early optical shallow decay in GRB 071112C
  74. GRB080207: optical observations
  75. GRB080205: optical observations
  76. GRB080211: optical observations
  77. GRB 071010B : Early optical brightening detected by TAOS
  78. Swift-XRT improved positions, and new redshift limits.
  79. ESO optical and NIR observations of GRB 080218B
  80. GRB 080218B: Swift-XRT refined analysis
  81. Swift/UVOT observations of GRB080218B
  82. GRB 080218B: REM NIR early upper limits
  83. GRB 080218B: Enhanced Swift-XRT position
  84. GRB 080218B: GROND upper limits
  85. GRB 080218b, SMARTS optical/IR limits
  86. GRB080218B: Watcher prompt limit
  87. GRB 080218B: Swift detection of a burst
  88. GRB 080218: Swift detection of a burst
  89. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  90. GRB 080212: VLT optical rapid decay
  91. GRB 080212: REM refined analysis
  92. VLA radio upper limit on GRB 080212
  93. Swift/UVOT refined analysis of GRB080212
  94. GRB 080212, Swift-BAT refined analysis
  95. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  96. GRB 080212: Gemini-South optical observations
  97. GRB 080212: GROND detects afterglow
  98. GRB 080212: REM NIR afterglow?
  99. GRB 080212: optical observations
  100. GRB 080212: Enhanced Swift-XRT position

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