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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"

16159 results found.

  1. GRB 120106A: Bassano Bresciano Observatory optical observations
  2. GRB 120106A: MASTER Early OT marginally detection
  3. INTEGRAL Weak trigger #6433: GRT Optical Observation
  4. GRB 120106A: MITSuME Okayama Optical upper limits
  5. GRB 120106A: TAROT Calern observatory optical observations
  6. GRB 120106A: MASTER-Tunka optical observations
  7. GRB111228A :LOAO R-band Observations
  8. GRB 111222A: Second Swift observation
  9. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  10. GRB 111228A: optical observations in CrAO
  11. GRB 120102A: Swift detection of a burst with an optical counterpart
  12. GRB 111225A: optical observations in CrAO
  13. GRB 111228A, optical observations
  14. GRB 111228A: LOAO Optical Observation
  15. GRB 111228A: MASTER-Net optical photometry
  16. GRB 111228A: Optical and NIR observations with Kanata telescope
  17. GRB 111228A: SMARTS optical/IR afterglow observations
  18. GRB 111229A: Swift/UVOT Detection
  19. GRB 111229A: Faulkes Telescope South observations
  20. GRB 111228A: Continued Skynet PROMPT/Dolomiti Optical Observations
  21. GRB 111229A: Gemini-South Redshift
  22. GRB 111229A: GROND afterglow candidate
  23. GRB 111228A: Liverpool Telescope Observations
  24. GRB 111225A: Lightbuckets Optical Observations
  25. GRB 111228A: P60 Observations
  26. GRB111228A: MITSuME Akeno photometry of the optical afterglow
  27. GRB 111228A: GMG optical observation
  28. GRB 111228A: NOT redshift
  29. GRB 111228A: Gemini South Redshift
  30. GRB 111228A: PAIRITEL NIR Detection
  31. GRB 111228A: TAROT La Silla observatory observations
  32. GRB 111228A: GROND observations
  33. GRB 111228A: MASTER OT observations
  34. GRB111228A: Errata of MITSuME Okayama about GRB name in GCNC 12743
  35. GRB 111228A: GRAS017 optical observations
  36. GRB 111228A: IAC80 BVI-band observations
  37. GRB 111228A: Skynet/Dolomiti Optical Observations
  38. GRB 111228A: NOT optical observation
  39. GRB 111228A: optical observations
  40. GRB 111228A, optical observations
  41. GRB111228A: MITSuME Okayama Optical Observation
  42. GRB 111228A: TAROT Calern observatory. OT seems still bright
  43. GRB 111225A, optical observations
  44. GRB 111228A: Xinglong TNT confirms the optical afterglow
  45. GRB 111228A: Swift detection of a burst with an optical counterpart
  46. GRB 111205A: optical observations
  47. GRB 111225A: Keck/LRIS Afterglow Photometry
  48. GRB 111225A: PAIRITEL NIR Upper Limits
  49. GRB111225A: MITSuME Okayama optical upper limits
  50. GRB 111225A: GRT Optical Observation
  51. GRB 111225A: 1.23m CAHA optical observations
  52. GRBv111225A: Xinglong TNT optical afterglow
  53. GRB 111225A: TAROT Calern observatory optical detection
  54. GRB 111225A: TAROT Calern observatory optical observations
  55. GRB 111225A: Swift detection of a burst with an optical counterpart
  56. GRB111222A: GMG optical observation
  57. GRB 111222A: Swift/UVOT Observations
  58. GRB 111210A: optical upper limit of Mt. Terskol observatory
  59. GRB 111103B: optical upper limit
  60. GRB 110820A: optical observations in Maidanak observatory
  61. GRB 111103A: optical upper limit of Mt. Terskol observatory
  62. GRB 111211A: optical ovservations at Mt. Terskol observatory
  63. GRB111215A: optical upper limit
  64. GRB 111215B: Swift/UVOT Upper Limits
  65. GRB 111215A: TNG K-band observations
  66. GRB 111215A: MITSuME Okayama Optical upper limits
  67. GRB 111215A: Swift/UVOT Upper Limits
  68. GRB 111215A: MASTER-Net optical prompt and follow up observations
  69. GRB 111215A, Optical Observations
  70. GRB 111215A: MITSuME Akeno Optical upper limits
  71. GRB 111209A: RAPTOR Limits Before and During the Gamma-ray Emitting Interval
  72. GRB 111215A: GMG optical upper limit
  73. GRB 111212A: GROND observations
  74. GRB 111211A: NOT afterglow confirmation
  75. GRB 111212A: Swift/UVOT Upper Limits
  76. GRB 111209A - ATCA 34GHz upper limit
  77. Konus-Wind observation of GRB 111209A
  78. GRB 111210A: GROND observations
  79. GRB 111210A: MITSuME Okayama Optical upper limits
  80. GRB 111210A: Swift/UVOT Upper Limits
  81. GRB 111209A: GROND Afterglow observations
  82. GRB 111209A optical limit by "Pi of the Sky"
  83. GRB 111209A: PROMPT optical observations of early afterglow
  84. GRB 111208A: Lightbuckets Optical Observations
  85. GRB 111209A: Swift Burst of Interest
  86. GRB 111209A: TAROT La Silla observatory optical light curve analysis
  87. GRB 111205A: GROND observations
  88. GRB 111209A: Faulkes Telescope North observations
  89. GRB 111209A: REM NIR detection
  90. GRB 111209A: TAROT La Silla observatory optical detection
  91. GRB 111209A: Swift detection of a long burst with an optical counterpart
  92. GRB 111208A: Swift XRT/UVOT observations
  93. GRB 111205A: Swift XRT Observations
  94. GRB 111117A: Refined GMG observation
  95. GRB 111201A: GMG optical observation
  96. GRB 111022B: CrAO optical limit
  97. GRB 111204A: Swift/UVOT Upper Limits
  98. GRB 110921A: optical observations in Maidanak observatory
  99. GRB 111204A: MASTER optical observations
  100. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613

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