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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"

27015 results found.

  1. GRB 120119A: Liverpool Telescope afterglow detection
  2. GRB 120119A: PAIRITEL NIR Detection
  3. GRB 120119A: Swift detection of a burst with an optical counterpart
  4. GRB 120118B: Faulkes Telescope South observations
  5. GRB 120118B: Swift detection of a burst
  6. GRB 120116A: Swift/UVOT Upper Limits
  7. GRB 120116A: Swift-XRT refined Analysis
  8. AXP 4U 1042+61: Mondy optical observations
  9. GRB 120116A: Mondy optical observations
  10. GRB 120116A: Gemini optical/IR candidate
  11. GRB 120116A: WHT optical observations
  12. GRB 120116A: Optical observations at Crni Vrh
  13. GRB 120116A: Swift-BAT refined analysis
  14. GRB 120116A: Bassano Bresciano Observatory optical observations
  15. GRB 120116A: Swift detection of a burst
  16. GRB 120114A found in ground analysis of BAT data
  17. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  18. Swift detection of an SGR burst from AXP 4U 0142+61
  19. GRB 120107A: Suzaku WAM observation of the prompt emission
  20. GRB 120107A: Fermi GBM observation
  21. Konus-Wind observation of GRB 120107A
  22. IPN Triangulation of GRB 120107A
  23. GBM trigger 347620337 (GRB 120107A?) : High-energy photon emission in Fermi/LAT data
  24. GRB 120106A: Swift/UVOT Upper Limits
  25. GRB 120106A: Bassano Bresciano Observatory optical observations
  26. GRB 120106A: MITSuME Okayama Ks-band upper limit
  27. GRB 120106A: MASTER Early OT marginally detection
  28. GRB 120106A: Swift-XRT refined Analysis
  29. INTEGRAL Weak trigger #6433: GRT Optical Observation
  30. GRB 120106A: Swift-BAT refined analysis
  31. GRB 120106A: TAROT Calern observatory optical observations
  32. GRB 120106A: Swift detection of a burst
  33. GRB 111222A: Fermi GBM observations
  34. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  35. GRB 120102A: Fermi GBM observation
  36. Konus-Wind observation of GRB 120102A
  37. GRB 120102A: Swift-BAT refined analysis
  38. GRB 120102A: Swift-XRT refined Analysis
  39. GRB 120102A: Swift/UVOT Detection
  40. GRB 120102A: Swift detection of a burst with an optical counterpart
  41. GRB 111228A, optical observations
  42. Konus-Wind observation of GRB 111228A
  43. GRB 111228A: correction for GCN 12787
  44. GRB 111228A: Optical and NIR observations with Kanata telescope
  45. GRB 111229A: Swift/UVOT Detection
  46. GRB 111229A: Faulkes Telescope South observations
  47. GRB 111229A: Swift-XRT refined Analysis
  48. GRB 111229A: Gemini-South Redshift
  49. GRB 111229A: Swift-BAT refined analysis
  50. GRB 111229A: Swift detection of a burst
  51. GRB 111228A: Liverpool Telescope Observations
  52. GRB 111225A: Lightbuckets Optical Observations
  53. GRB 111228A: P60 Observations
  54. GRB 111228A: T100 observations
  55. GRB 111228A: Swift-XRT refined Analysis
  56. FERMI GRB111228.45: MASTER observations
  57. GRB 111228A: Gemini South Redshift
  58. GRB 111228A: PAIRITEL NIR Detection
  59. GRB 111228A: TAROT La Silla observatory observations
  60. GRB 111228A: GRAS017 optical observations
  61. GRB 111228A: Swift/UVOT Detection
  62. GRB 111228A: NOT optical observation
  63. GRB 111228A, Swift-BAT refined analysis
  64. GRB 111228A: optical observations
  65. GRB 111228A: TAROT Calern observatory. OT decay stopped
  66. GRB 111228A: Fermi GBM observation
  67. GRB 111228A: TAROT Calern observatory. OT seems still bright
  68. GRB 111225A, optical observations
  69. GRB 111228A: Swift detection of a burst with an optical counterpart
  70. GRB 111225A: Swift/UVOT Observations
  71. GRB 111215A: Keck/LRIS Imaging
  72. GRB 111225A: Keck/LRIS Afterglow Photometry
  73. GRB 111222A : Suzaku WAM observation of the prompt emission
  74. GRB 111225A: PAIRITEL NIR Upper Limits
  75. GRB 111225A: GRT Optical Observation
  76. GRB 111225A: Swift-XRT refined Analysis
  77. GRB 111225A, Swift-BAT refined analysis
  78. GRB 111225A: Super-LOTIS early detection
  79. GRB 111225A: TAROT Calern observatory optical detection
  80. GRB 111225A: TAROT Calern observatory optical observations
  81. GRB 111225A: Swift detection of a burst with an optical counterpart
  82. GRB 111222A: Swift/UVOT Observations
  83. GRB 111222A: Swift-XRT observations
  84. Trigger 510075 is not a GRB
  85. GRB111215A: CARMA Detection
  86. GRB 111215B: Suzaku WAM observation of the prompt emission
  87. GRB 111215B: Swift/UVOT Upper Limits
  88. GRB 111215B: Swift-XRT observations
  89. GRB 111215A: TNG K-band observations
  90. GRB 111215A: Swift/UVOT Upper Limits
  91. GRB 111215A: Swift-XRT refined Analysis
  92. Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
  93. GRB 111215A: Swift-BAT refined analysis
  94. GRB 111215A: MASTER-Net optical prompt and follow up observations
  95. GRB 111215A: MITSuME Akeno Optical upper limits
  96. GRB 111215A: GMG optical upper limit
  97. GRB 111215A: Swift detection of a burst
  98. GRB 111212A: GROND observations
  99. GRB 111211A: Swift/UVOT Detection
  100. GRB 111211A: NOT afterglow confirmation

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