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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"

44268 results found.

  1. GRB 120106A: Swift-XRT refined Analysis
  2. INTEGRAL Weak trigger #6433: GRT Optical Observation
  3. GRB 120106A: Swift-BAT refined analysis
  4. GRB 120106A: MITSuME Okayama Optical upper limits
  5. GRB 120106A: Enhanced Swift-XRT position
  6. GRB 120106A: TAROT Calern observatory optical observations
  7. GRB 120106A: MASTER-Tunka optical observations
  8. GRB 120106A: Swift detection of a burst
  9. GRB111228A :LOAO R-band Observations
  10. GRB 111225A, the review of the sky area in plate archives
  11. GRB 111222A, the review of the sky area in plate archives
  12. GRB 111222A: Fermi GBM observations
  13. GRB 111222A: Second Swift observation
  14. GRB111209A: ATCA detection at 5.5, 9, and 18GHz
  15. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  16. GRB 111211A: Detection of the SN with the 10.4m GTC
  17. GRB 120102A: Fermi GBM observation
  18. Konus-Wind observation of GRB 120102A
  19. GRB 120102A: Swift-BAT refined analysis
  20. GRB 111228A: optical observations in CrAO
  21. GRB 120102A: Swift-XRT refined Analysis
  22. GRB 120102A: Swift/UVOT Detection
  23. GRB 120102A: Enhanced Swift-XRT position
  24. GRB 120102A: Swift detection of a burst with an optical counterpart
  25. GRB 111225A: optical observations in CrAO
  26. GRB 111228A, optical observations
  27. GRB 111228A: LOAO Optical Observation
  28. Konus-Wind observation of GRB 111228A
  29. GRB 111228A: MASTER-Net optical photometry
  30. GRB 111228A: correction for GCN 12787
  31. GRB 111228A: Optical and NIR observations with Kanata telescope
  32. GRB 110915A, the review of the sky area in plate archives
  33. GRB 111228A: SMARTS optical/IR afterglow observations
  34. GRB 111229A: Swift/UVOT Detection
  35. GRB 111229A: Faulkes Telescope South observations
  36. GRB 111229A: Swift-XRT refined Analysis
  37. GRB 111229A: Enhanced Swift-XRT position
  38. GRB 111228A: Continued Skynet PROMPT/Dolomiti Optical Observations
  39. GRB111228A: Further GMG observations
  40. GRB 111229A: Gemini-South Redshift
  41. GRB 111229A: Swift-BAT refined analysis
  42. GRB 111229A: GROND afterglow candidate
  43. GRB 111229A: Swift detection of a burst
  44. GRB 111228A: Liverpool Telescope Observations
  45. GRB 111225A: Lightbuckets Optical Observations
  46. GRB 111228A: P60 Observations
  47. GRB 111228A: X-shooter spectroscopy
  48. GRB 111228A: T100 observations
  49. GRB111228A: MITSuME Akeno photometry of the optical afterglow
  50. GRB 111228A: GMG optical observation
  51. GRB 111228A: Swift-XRT refined Analysis
  52. GRB 111228A: NOT redshift
  53. GRB111228A: TNG spectroscopy analysis
  54. FERMI GRB111228.45: MASTER observations
  55. GRB 111228A: Gemini South Redshift
  56. GRB 111228A: PAIRITEL NIR Detection
  57. GRB 111228A: MMT Redshift
  58. GRB 111228A: TAROT La Silla observatory observations
  59. GRB 111228A: GROND observations
  60. GRB 111228A: MASTER OT observations
  61. GRB111228A: Errata of MITSuME Okayama about GRB name in GCNC 12743
  62. GRB 111228A: GRAS017 optical observations
  63. GRB 111228A: IAC80 BVI-band observations
  64. GRB 111228A: Swift/UVOT Detection
  65. GRB 111228A: Skynet/Dolomiti Optical Observations
  66. GRB 111228A: NOT optical observation
  67. GRB 111228A, Swift-BAT refined analysis
  68. GRB 111228A: optical observations
  69. GRB 111228A: Enhanced Swift-XRT position
  70. GRB 111228A: TAROT Calern observatory. OT decay stopped
  71. GRB 111228A, optical observations
  72. GRB 111228A: Fermi GBM observation
  73. GRB111228A: MITSuME Okayama Optical Observation
  74. GRB 111228A: TAROT Calern observatory. OT seems still bright
  75. GRB 111228A: Possible host galaxy in the SDSS arhive
  76. GRB 111225A, optical observations
  77. XMM-Newton observation of the short GRB 111020A
  78. GRB 111228A: Xinglong TNT confirms the optical afterglow
  79. GRB 111228A: Swift detection of a burst with an optical counterpart
  80. GRB 111205A: optical observations
  81. GRB 111225A: Swift/UVOT Observations
  82. GRB 111215A: Keck/LRIS Imaging
  83. GRB 111225A: Keck/LRIS Afterglow Photometry
  84. GRB 111222A : Suzaku WAM observation of the prompt emission
  85. GRB 111225A: PAIRITEL NIR Upper Limits
  86. GRB111225A: MITSuME Okayama optical upper limits
  87. GRB 111225A: GRT Optical Observation
  88. GRB 111225A: 1.23m CAHA optical observations
  89. GRB 111225A: Swift-XRT refined Analysis
  90. GRB 111225A, Swift-BAT refined analysis
  91. GRBv111225A: Xinglong TNT optical afterglow
  92. GRB 111225A: Enhanced Swift-XRT position
  93. GRB 111225A: Super-LOTIS early detection
  94. GRB 111225A: TAROT Calern observatory optical detection
  95. GRB 111225A: TAROT Calern observatory optical observations
  96. GRB 111225A: Swift detection of a burst with an optical counterpart
  97. GRB111222A: GMG optical observation
  98. GRB 111222A: Xinglong TNT observation
  99. GRB 111222A: Swift/UVOT Observations
  100. GRB 111222A: Swift-XRT observations

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