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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"

42185 results found.

  1. GRB 080319A: optical observations at the NOT
  2. GRB0 080319B : LOAO optical observation
  3. GRB 080319b: Early IR Imaging from PAIRITEL
  4. GRB080319B Liverpool Telescope optical afterglow candidate
  5. GRB 080319B: Super-LOTIS Detection of a Bright OT
  6. GRB080319A: P60 Optical Afterglow Observations
  7. GRB 080319B: UVOT Position
  8. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  9. GRB 080319A: Swift detection of a burst
  10. GRB080310, LBT and MDM photometry
  11. GRB080315: Bok Optical Observations
  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: Lick/Kast Spectroscopy
  44. GRB 080310, SMARTS optical/IR afterglow observations
  45. GRB 080310: Magellan redshift
  46. GRB 080310: Swift detection of a burst with optical afterglow
  47. GRB080229, optical upper limit (Correction)
  48. GRB080307, optical upper limit
  49. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  50. GRB080229, optical upper limit
  51. GRB 080307: Swift-XRT Team refined analysis
  52. GRB 080307: Early RAPTOR Limits
  53. GRB 080307, Swift-BAT refined analysis
  54. GRB080307 - SDSS Pre-Burst Observations
  55. GRB 080307: TNT optical observation
  56. GRB080307: Optical upper limits
  57. GRB 080307: Gemini-N i-band observations - candidate afterglow
  58. GRB 080307: retraction of UVOT candidate
  59. GRB 080307: Enhanced Swift-XRT position
  60. GRB 080307, Preliminary Swift-BAT refined analysis
  61. GRB 080307 : BOAO optical afterglow observation
  62. GRB 080307: Optical observation with DMC/KANATA
  63. GRB 080307: Swift detection of a burst
  64. GRB 080303: Swift/UVOT follow-up of afterglow detection
  65. GRB 080303, Swift-BAT refined analysis
  66. GRB 080303: Rapid PROMPT Detections
  67. GRB080303: Swift XRT refined analysis
  68. GRB 080303: Enhanced Swift-XRT position
  69. Swift UVOT observations of GRB080229B
  70. GRB080229B: Swift XRT afterglow observation
  71. GRB 080303A: Faulkes Telescope South optical afterglow observations
  72. GRB 080303
  73. GRB 080303: Swift detection of a burst with optical afterglow
  74. GRB 080303: REM NIR afterglow candidate
  75. GRB 080303A: ROTSE-III Optical Limits
  76. GRB 080229: I-band observations from OSN
  77. GRB 080229: VLT NIR observations
  78. GRB080229: Swift XRT refined analysis
  79. GRB 080229: TNG NIR observations
  80. GRB 080229: Deep Gemini/GMOS optical observations
  81. GRB 080229: Enhanced Swift-XRT position
  82. GRB080229: Possible optical afterglow
  83. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  84. UVOT analysis for GRB080229
  85. GRB 080229, Swift-BAT refined analysis
  86. GRB 080229: Faulkes Telescope South optical limit
  87. GRB 080229A: ROTSE-III Optical Limits
  88. GRB 080229: Swift detection of a bright burst
  89. Early optical shallow decay in GRB 071112C
  90. GRB080207: optical observations
  91. GRB080205: optical observations
  92. GRB080211: optical observations
  93. GRB 071010B : Early optical brightening detected by TAOS
  94. Swift-XRT improved positions, and new redshift limits.
  95. ESO optical and NIR observations of GRB 080218B
  96. GRB 080204: Suzaku WAM observation of the prompt emission
  97. GRB 080218B, Swift-BAT refined analysis
  98. GRB 080218B: Swift-XRT refined analysis
  99. GRB 080212: Mount Abu NIR observations
  100. GRB 080218B: Enhanced Swift-XRT position

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