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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"

41186 results found.

  1. GRB 080319B: Gemini-South Spectroscopy
  2. GRB 080319A: optical observations at the NOT
  3. GRB0 080319B : LOAO optical observation
  4. GRB 080319b: Early IR Imaging from PAIRITEL
  5. GRB080319B Liverpool Telescope optical afterglow candidate
  6. GRB 080319B: Super-LOTIS Detection of a Bright OT
  7. GRB080319A: P60 Optical Afterglow Observations
  8. GRB 080319B: UVOT Position
  9. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  10. GRB 080319A: Swift detection of a burst
  11. GRB080310, LBT and MDM photometry
  12. GRB080315: Bok Optical Observations
  13. Swift trigger 306323: Swift-BAT/XRT refined analysis
  14. SAX J1818.6-1703: Swift detection (trigger 306379)
  15. GRB 080315: Optical observations
  16. GRB 080315: TAROT Calern observatory optical observations
  17. GRB 080315: Swift detection of a possible burst
  18. GRB080310 : Lulin Optical observations
  19. GRB080310, unusual slow decay in the optical
  20. GRB 080310: GAO 150cm telescope Optical Observation
  21. GRB080310 : Optical observations by LOAO and Lulin
  22. GRB 080310: ROTSE-III Observations of Optical Counterpart
  23. GRB080310: Optical observation by MITSuME telescope
  24. GRB080310, optical observations with the LBT
  25. GRB 080307: GAO 150cm telescope Optical Observation
  26. GRB 080229A: GAO 150cm telescope Optical Observation
  27. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  28. GRB 080307: NIR upper limit
  29. GRB 080229: NIR upper limit
  30. GRB 080310: early RAPTOR multicolor observations
  31. GRB 080310, Swift-BAT refined analysis
  32. GRB080210: optical observations
  33. GRB080307: optical upper limit
  34. GRB 080310: Swift-XRT refined analysis
  35. GRB 080310: Swift/UVOT Refined Analysis
  36. GRB 080310: Redshift from Keck/DEIMOS Spectra
  37. GRB 080310 - SDSS Pre-Burst Observations
  38. GRB080310 : Lulin optical observation
  39. GRB 080310: Enhanced Swift-XRT position
  40. GRB 080310: RRM optical photometry with the VLT
  41. GRB080310, detection of break in optical
  42. GRB 080310: VLT/UVES spectroscopy
  43. GRB080310, optical observations with LBT
  44. GRB 080310: Lick/Kast Spectroscopy
  45. GRB 080310, SMARTS optical/IR afterglow observations
  46. GRB 080310: Magellan redshift
  47. GRB 080310: Swift detection of a burst with optical afterglow
  48. GRB080229, optical upper limit (Correction)
  49. GRB080307, optical upper limit
  50. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  51. GRB080229, optical upper limit
  52. GRB 080307: Swift-XRT Team refined analysis
  53. GRB 080307: Early RAPTOR Limits
  54. GRB 080307, Swift-BAT refined analysis
  55. GRB080307 - SDSS Pre-Burst Observations
  56. GRB 080307: TNT optical observation
  57. GRB080307: Optical upper limits
  58. GRB 080307: Gemini-N i-band observations - candidate afterglow
  59. GRB 080307: retraction of UVOT candidate
  60. GRB 080307: Enhanced Swift-XRT position
  61. GRB 080307, Preliminary Swift-BAT refined analysis
  62. GRB 080307 : BOAO optical afterglow observation
  63. GRB 080307: Optical observation with DMC/KANATA
  64. GRB 080307: Swift detection of a burst
  65. GRB 080303: Swift/UVOT follow-up of afterglow detection
  66. GRB 080303, Swift-BAT refined analysis
  67. GRB 080303: Rapid PROMPT Detections
  68. GRB080303: Swift XRT refined analysis
  69. GRB 080303: Enhanced Swift-XRT position
  70. Swift UVOT observations of GRB080229B
  71. GRB080229B: Swift XRT afterglow observation
  72. GRB 080303A: Faulkes Telescope South optical afterglow observations
  73. GRB 080303
  74. GRB 080303: Swift detection of a burst with optical afterglow
  75. GRB 080303: REM NIR afterglow candidate
  76. GRB 080303A: ROTSE-III Optical Limits
  77. GRB 080229: I-band observations from OSN
  78. GRB 080229: VLT NIR observations
  79. GRB080229: Swift XRT refined analysis
  80. GRB 080229: TNG NIR observations
  81. GRB 080229: Deep Gemini/GMOS optical observations
  82. GRB 080229: Enhanced Swift-XRT position
  83. GRB080229: Possible optical afterglow
  84. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  85. UVOT analysis for GRB080229
  86. GRB 080229, Swift-BAT refined analysis
  87. GRB 080229: Faulkes Telescope South optical limit
  88. GRB 080229A: ROTSE-III Optical Limits
  89. GRB 080229: Swift detection of a bright burst
  90. Early optical shallow decay in GRB 071112C
  91. GRB080207: optical observations
  92. GRB080205: optical observations
  93. GRB080211: optical observations
  94. GRB 071010B : Early optical brightening detected by TAOS
  95. Swift-XRT improved positions, and new redshift limits.
  96. ESO optical and NIR observations of GRB 080218B
  97. GRB 080204: Suzaku WAM observation of the prompt emission
  98. GRB 080218B, Swift-BAT refined analysis
  99. GRB 080218B: Swift-XRT refined analysis
  100. GRB 080212: Mount Abu NIR observations

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