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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"

27553 results found.

  1. GRB 080229: NIR upper limit
  2. GRB 080310, Swift-BAT refined analysis
  3. GRB080210: optical observations
  4. GRB080307: optical upper limit
  5. GRB 080310: Swift-XRT refined analysis
  6. GRB 080310: Swift/UVOT Refined Analysis
  7. GRB 080310: Redshift from Keck/DEIMOS Spectra
  8. GRB080310 : Lulin optical observation
  9. GRB 080310: Enhanced Swift-XRT position
  10. GRB 080310: RRM optical photometry with the VLT
  11. GRB080310, detection of break in optical
  12. GRB 080310: VLT/UVES spectroscopy
  13. GRB 080310: Magellan redshift revision
  14. GRB 080310: Lick/Kast Spectroscopy
  15. GRB080310: Super-LOTIS suggestion of brightening
  16. GRB 080310, SMARTS optical/IR afterglow observations
  17. GRB 080310: REM observations
  18. GRB 080310: Magellan redshift
  19. GRB 080310 afterglow candidate (correction to UT time)
  20. GRB 080310: Swift detection of a burst with optical afterglow
  21. GRB 080310 afterglow candidate
  22. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  23. GRB 080307: Swift-XRT Team refined analysis
  24. GRB 080307: Early RAPTOR Limits
  25. GRB 080307: TNT optical observation
  26. GRB080307: Optical upper limits
  27. GRB 080307: Gemini-N i-band observations - candidate afterglow
  28. GRB 080307: BOAO imaging - retraction and new limit
  29. GRB 080307: retraction of UVOT candidate
  30. GRB 080307: Enhanced Swift-XRT position
  31. GRB 080307 : BOAO optical afterglow observation
  32. GRB 080307: Optical observation with DMC/KANATA
  33. GRB 080307: Swift detection of a burst
  34. VLA possible radio detection of GRB 080229
  35. GRB 080303: Swift/UVOT follow-up of afterglow detection
  36. GRB 080303: Rapid PROMPT Detections
  37. GRB080303: Swift XRT refined analysis
  38. GRB 080303: Enhanced Swift-XRT position
  39. Swift UVOT observations of GRB080229B
  40. GRB080229B: Swift XRT afterglow observation
  41. GRB 080303A: Faulkes Telescope South optical afterglow observations
  42. GRB 080303
  43. GRB 080303: Swift detection of a burst with optical afterglow
  44. GRB 080303: REM NIR afterglow candidate
  45. GRB 080303A: ROTSE-III Optical Limits
  46. GRB 080229: I-band observations from OSN
  47. GRB 080229: VLT NIR observations
  48. GRB080229: Swift XRT refined analysis
  49. GRB 080229: TNG NIR observations
  50. GRB 080229: Deep Gemini/GMOS optical observations
  51. GRB 080229: Enhanced Swift-XRT position
  52. GRB 080229: REM NIR observations
  53. GRB080229: Possible optical afterglow
  54. UVOT analysis for GRB080229
  55. GRB 080229: Faulkes Telescope South optical limit
  56. GRB 080229A: ROTSE-III Optical Limits
  57. GRB 080229: Swift detection of a bright burst
  58. Early optical shallow decay in GRB 071112C
  59. GRB080207: optical observations
  60. GRB080205: optical observations
  61. GRB080211: optical observations
  62. GRB 071010B : Early optical brightening detected by TAOS
  63. Swift-XRT improved positions, and new redshift limits.
  64. ESO optical and NIR observations of GRB 080218B
  65. GRB 080218B: Swift-XRT refined analysis
  66. Swift/UVOT observations of GRB080218B
  67. GRB 080218B: REM NIR early upper limits
  68. GRB 080218B: Enhanced Swift-XRT position
  69. GRB 080218B: GROND upper limits
  70. GRB 080218b, SMARTS optical/IR limits
  71. GRB080218B: Watcher prompt limit
  72. GRB 080218B: Swift detection of a burst
  73. GRB 080218: Swift detection of a burst
  74. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  75. GRB 080212: VLT optical rapid decay
  76. GRB 080212: REM refined analysis
  77. VLA radio upper limit on GRB 080212
  78. Swift/UVOT refined analysis of GRB080212
  79. GRB 080212, Swift-BAT refined analysis
  80. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  81. GRB 080212: Gemini-South optical observations
  82. GRB 080212: GROND detects afterglow
  83. GRB 080212: REM NIR afterglow?
  84. GRB 080212: optical observations
  85. GRB 080212: Enhanced Swift-XRT position
  86. GRB 080212: Swift-XRT Team refined analysis
  87. GRB 080210: Keck photometry
  88. VLA non-detection of GRB 080210
  89. GRB 080212: Swift detection of a burst
  90. GRB 080212: DSS/2MASS Galaxy at XRT position
  91. GRB 080207: VLT NIR early upper limits
  92. GRB 080210: Swift/UVOT Refined Analysis
  93. GRB 080207: optical observations.
  94. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  95. GRB 080210: Super-LOTIS observations
  96. GRB 080210: Swift-XRT Refined Analysis
  97. GRB 080210: VLT redshift
  98. GRB 080210: Enhanced Swift-XRT position
  99. GRB 080210: Rapid PROMPT Detections
  100. GRB 080210: GOND detection in all bands and redshift upper limit

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