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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"

20967 results found.

  1. GRB 120116A: Mondy optical observations
  2. GRB 120116A: EVLA observations
  3. GRB 120116A: WHT optical observations
  4. GRB 120116A: Optical observations at Crni Vrh
  5. GRB 120116A: NOT observations
  6. GRB 120116A: IAC80 I-band observations
  7. GRB 120116A: Bassano Bresciano Observatory optical observations
  8. GRB 111228A: optical observations
  9. IPN Triangulation of GRB 120107A
  10. GRB 120106A: Swift/UVOT Upper Limits
  11. GRB 120106A: Bassano Bresciano Observatory optical observations
  12. GRB 120106A: MITSuME Okayama Ks-band upper limit
  13. GRB 120106A: TAROT Calern observatory optical observations
  14. GRB 120106A: MASTER-Tunka optical observations
  15. GRB111228A :LOAO R-band Observations
  16. GRB 111222A: Fermi GBM observations
  17. GRB 111222A: Second Swift observation
  18. GRB111209A: ATCA detection at 5.5, 9, and 18GHz
  19. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  20. GRB 111228A: optical observations in CrAO
  21. GRB 120102A: Swift/UVOT Detection
  22. GRB 111225A: optical observations in CrAO
  23. GRB 111228A, optical observations
  24. GRB 111228A: Optical and NIR observations with Kanata telescope
  25. GRB 111228A: SMARTS optical/IR afterglow observations
  26. GRB 111229A: Swift/UVOT Detection
  27. GRB 111229A: Faulkes Telescope South observations
  28. GRB 111228A: Continued Skynet PROMPT/Dolomiti Optical Observations
  29. GRB111228A: Further GMG observations
  30. GRB 111229A: GROND afterglow candidate
  31. GRB 111228A: Liverpool Telescope Observations
  32. GRB 111225A: Lightbuckets Optical Observations
  33. GRB 111228A: P60 Observations
  34. GRB 111228A: T100 observations
  35. GRB 111228A: GMG optical observation
  36. GRB 111228A: NOT redshift
  37. FERMI GRB111228.45: MASTER observations
  38. GRB 111228A: Gemini South Redshift
  39. GRB 111228A: PAIRITEL NIR Detection
  40. GRB 111228A: MMT Redshift
  41. GRB 111228A: TAROT La Silla observatory observations
  42. GRB 111228A: GROND observations
  43. GRB 111228A: MASTER OT observations
  44. GRB 111228A: GRAS017 optical observations
  45. GRB 111228A: IAC80 BVI-band observations
  46. GRB 111228A: Swift/UVOT Detection
  47. GRB 111228A: Skynet/Dolomiti Optical Observations
  48. GRB 111228A: NOT optical observation
  49. GRB 111228A: optical observations
  50. GRB 111228A: TAROT Calern observatory. OT decay stopped
  51. GRB 111228A, optical observations
  52. GRB 111228A: TAROT Calern observatory. OT seems still bright
  53. GRB 111225A, optical observations
  54. GRB 111228A: Xinglong TNT confirms the optical afterglow
  55. GRB 111205A: optical observations
  56. GRB 111225A: Swift/UVOT Observations
  57. GRB 111225A: PAIRITEL NIR Upper Limits
  58. GRB 111225A: 1.23m CAHA optical observations
  59. GRBv111225A: Xinglong TNT optical afterglow
  60. GRB 111225A: Super-LOTIS early detection
  61. GRB 111225A: TAROT Calern observatory optical observations
  62. GRB111222A: GMG optical observation
  63. GRB 111222A: Xinglong TNT observation
  64. GRB 111222A: Swift/UVOT Observations
  65. GRB 111222A: Swift-XRT observations
  66. GRB 111215A: EVLA observations
  67. GRB 110820A: optical observations in Maidanak observatory
  68. GRB 111215B: Swift/UVOT Upper Limits
  69. GRB 111215B: Swift-XRT observations
  70. GRB 111215A: WHT, LT and NOT imaging
  71. GRB 111215A: TNG K-band observations
  72. GRB 111215A: Swift/UVOT Upper Limits
  73. Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
  74. GRB 111215A: OSN I-band observations
  75. GRB 111215A: MASTER-Net optical prompt and follow up observations
  76. GRB 111215A, Optical Observations
  77. GRB 111215A: GMG optical upper limit
  78. GRB 111215A : Xinglong TNT upper limit
  79. GRB 111212A: GROND observations
  80. GRB 111211A: VLT/X-shooter redshift
  81. GRB 111211A: NOT afterglow confirmation
  82. GRB 111211A: Swift/XRT target of opportunity observation
  83. GRB 111212A: Swift/UVOT Upper Limits
  84. GRB 111212A: Swift-XRT observations
  85. GRB 111211A: GROND afterglow candidate
  86. GRB 111210A: Xinglong TNT upper limit
  87. GRB 111209A - ATCA 34GHz upper limit
  88. GRB 111210A: GROND observations
  89. GRB 111210A: Gemini-North candidate counterpart
  90. GRB 111209A: Rebrightening seen by GROND
  91. GRB111210A: MITSuME Okayama J-band upper-limit
  92. GRB 111210A: Swift/UVOT Upper Limits
  93. GRB 111209A: VLT/X-shooter redshift
  94. GRB 111209A: GROND Afterglow observations
  95. GRB 111209A: PROMPT optical observations of early afterglow
  96. GRB 111208A: Lightbuckets Optical Observations
  97. GRB 111209A: Swift UVOT refined analysis
  98. GRB 111209A: Swift Burst of Interest
  99. GRB 111205A: GROND observations
  100. GRB 111209A: Faulkes Telescope North observations

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