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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"
  1. GRB 080319B: REM observations
  2. GRB 080319B: KAIT OA
  3. GRB080319A: P60 Optical Afterglow Observations
  4. GRB 080319B: UVOT Position
  5. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  6. GRB 080319A: Swift detection of a burst
  7. Swift Trigger 306745 is not a GRB
  8. Swift Trigger 306616 is not a GRB
  9. GRB080310, LBT and MDM photometry
  10. GRB080315: Bok Optical Observations
  11. Swift/UVOT observations of GRB 080315
  12. Swift trigger 306323: Swift-BAT/XRT refined analysis
  13. SAX J1818.6-1703: Swift detection (trigger 306379)
  14. GRB 080315: Optical observations
  15. GRB 080315: TAROT Calern observatory optical observations
  16. GRB 080315: Swift detection of a possible burst
  17. GRB080310 : Lulin Optical observations
  18. GRB080310, unusual slow decay in the optical
  19. GRB 080310: GAO 150cm telescope Optical Observation
  20. GRB080310 : Optical observations by LOAO and Lulin
  21. GRB 080310: ROTSE-III Observations of Optical Counterpart
  22. GRB080310: Optical observation by MITSuME telescope
  23. GRB080310, optical observations with the LBT
  24. GRB 080307: GAO 150cm telescope Optical Observation
  25. GRB 080229A: GAO 150cm telescope Optical Observation
  26. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  27. GRB 080307: NIR upper limit
  28. GRB 080229: NIR upper limit
  29. GRB 080310: early RAPTOR multicolor observations
  30. GRB 080310, Swift-BAT refined analysis
  31. GRB080210: optical observations
  32. GRB080307: optical upper limit
  33. GRB 080310: Swift-XRT refined analysis
  34. GRB 080310: Swift/UVOT Refined Analysis
  35. GRB 080310: Redshift from Keck/DEIMOS Spectra
  36. GRB 080310 - SDSS Pre-Burst Observations
  37. GRB080310 : Lulin optical observation
  38. GRB 080310: Enhanced Swift-XRT position
  39. GRB 080310: RRM optical photometry with the VLT
  40. GRB080310, detection of break in optical
  41. GRB 080310: VLT/UVES spectroscopy
  42. GRB080310, optical observations with LBT
  43. GRB 080310: Magellan redshift revision
  44. GRB 080310: Lick/Kast Spectroscopy
  45. GRB080310: Super-LOTIS suggestion of brightening
  46. GRB 080310, SMARTS optical/IR afterglow observations
  47. GRB 080310: REM observations
  48. GRB 080310: Magellan redshift
  49. GRB 080310 afterglow candidate (correction to UT time)
  50. GRB 080310: Swift detection of a burst with optical afterglow
  51. GRB 080310 afterglow candidate
  52. GRB080229, optical upper limit (Correction)
  53. GRB080307, optical upper limit
  54. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  55. GRB080229, optical upper limit
  56. GRB 080307: Swift-XRT Team refined analysis
  57. GRB 080307: Swift/UVOT Upper Limits
  58. GRB 080307: Early RAPTOR Limits
  59. GRB 080307, Swift-BAT refined analysis
  60. GRB080307 - SDSS Pre-Burst Observations
  61. GRB 080307: TNT optical observation
  62. GRB080307: Optical upper limits
  63. GRB 080307: Gemini-N i-band observations - candidate afterglow
  64. GRB 080307: BOAO imaging - retraction and new limit
  65. GRB 080307: retraction of UVOT candidate
  66. GRB 080307: Enhanced Swift-XRT position
  67. GRB 080307, Preliminary Swift-BAT refined analysis
  68. GRB 080307 : BOAO optical afterglow observation
  69. GRB 080307: Optical observation with DMC/KANATA
  70. GRB 080307: Swift detection of a burst
  71. VLA possible radio detection of GRB 080229
  72. GRB 080303: Swift/UVOT follow-up of afterglow detection
  73. GRB 080303, Swift-BAT refined analysis
  74. GRB 080303: Rapid PROMPT Detections
  75. GRB080303: Swift XRT refined analysis
  76. GRB 080303: Enhanced Swift-XRT position
  77. Swift UVOT observations of GRB080229B
  78. GRB080229B: Swift XRT afterglow observation
  79. GRB 080303A: Faulkes Telescope South optical afterglow observations
  80. GRB 080303
  81. GRB 080303: Swift detection of a burst with optical afterglow
  82. GRB 080303: REM NIR afterglow candidate
  83. GRB 080303A: ROTSE-III Optical Limits
  84. GRB 080229: I-band observations from OSN
  85. GRB 080229: VLT NIR observations
  86. GRB080229: Swift XRT refined analysis
  87. GRB 080229: TNG NIR observations
  88. GRB 080229: Deep Gemini/GMOS optical observations
  89. GRB 080229: Enhanced Swift-XRT position
  90. GRB 080229: REM NIR observations
  91. GRB080229: Possible optical afterglow
  92. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  93. UVOT analysis for GRB080229
  94. GRB 080229, Swift-BAT refined analysis
  95. GRB 080229: Faulkes Telescope South optical limit
  96. GRB 080229A: ROTSE-III Optical Limits
  97. GRB 080229: Swift detection of a bright burst
  98. Early optical shallow decay in GRB 071112C
  99. GRB080207: optical observations
  100. GRB080205: optical observations

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