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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"

19042 results found.

  1. GRB 150911A: Chuguev observatory upper limit
  2. GRB 150911A: Mt. Terskol observatory upper limit
  3. GRB 150911A: Khureltogot upper limit
  4. GRB 150910A: Mt. Terskol observatory optical observation
  5. GRB 150912A: MITSuME Ishigakijima upper limits
  6. GRB 150910A: RATIR Observations
  7. GRB 150910A: MITSuME Ishigakijima Optical Observation after 2 days
  8. GRB 150912A: Swift ToO observations
  9. GRB 150911A: Swift/UVOT Upper Limits
  10. GRB 150910A: AAO optical observations
  11. GRB 150910A: MITSuME Ishigakijima Optical Observation after 1 day
  12. GRB 150910A: Chuguev observatory optical observations
  13. GRB 150911A: MITSuME Okayama upper limits
  14. GRB 150910A: continued SAO RAS optical observations
  15. GRB 150911A: Enhanced Swift-XRT position
  16. GRB150911A MITSuME Okayama Ks-band upper-limit
  17. GRB 150910A: TSHAO optical observations
  18. GRB 150911A: Swift detection of a burst
  19. GRB 150910A: NOT observations of the afterglow
  20. GRB 150910A: MITSuME Okayama Ks-band Observation
  21. GRB 150910A: GROND observation of the afterglow
  22. GRB 150910A: MITSuME Ishigakijima Optical Observation
  23. GRB 150910A: SAO RAS optical photometry
  24. GRB 150910A: Enhanced Swift-XRT position
  25. GRB 150910A: Swift/UVOT Detection of a Brightening Afterglow
  26. GRB 150910A: Nanshan optical observations
  27. GRB 150910A: MITSuME Okayama Optical Observation
  28. GRB 150910A: Swift detection of a burst with an optical afterglow
  29. Fermi GBM trigger 463422723/150908689 is not a GRB
  30. IPN Triangulation of GRB 150906B (short/intense)
  31. GRB150907A: Swift/UVOT observations
  32. GRB 150907B: Enhanced Swift-XRT position
  33. GRB 150907B: GROND Upper Limits
  34. GRB 150907B: Swift-XRT observations
  35. GRB 150907A: Tiled Swift observations
  36. GRB 150906A: Fermi GBM detection
  37. GRB 150818A: TSHAO and SAO RAS optical observations
  38. GRB 150902A: Swift-XRT afterglow detection
  39. ANTARES neutrino detection: ANU 2.3m and Kepler K2 Observations of the Swift x-ray source
  40. GRB 150902A: Swift/UVOT Upper Limits
  41. GRB 150831A: 9.8 GHz VLA upper limits
  42. GRB 150902A: Swift ToO observations
  43. GRB 150831B: Swift/UVOT Upper Limits
  44. GRB 150831B: Swift-BAT refined analysis
  45. GRB 150831A: GROND Upper Limits
  46. GRB 150831A: Swift/UVOT Upper Limits
  47. GRB 150831B: Swift-XRT observations
  48. GRB 150831A: Swift-XRT refined Analysis
  49. GRB 150831A: Swift-BAT refined analysis
  50. GRB 150831A: Enhanced Swift-XRT position
  51. GRB 150831A: optical upper limit ISON-SSO
  52. GRB 150831A: Swift detection of a short burst
  53. GRB 150821A, Swift-BAT refined analysis
  54. GRB 150821A: GROND afterglow observations
  55. GRB 150821A: Swift-XRT refined Analysis
  56. GRB 150819A: Mondy and TSHAO optical upper limits
  57. GRB 150821A: Swift/UVOT Detection
  58. GRB 150821A: Enhanced Swift-XRT position
  59. GRB 150821A: Swift detection of a burst with an optical afterglow
  60. GRB150819A: NOT imaging
  61. GRB 150818A: Continued NOT monitoring - afterglow confirmation
  62. GRB 150818A: Mondy optical observations
  63. GRB 150818A: MITSuME Ishigakijima upper limits
  64. GRB 150819A: RATIR Optical Observations
  65. GRB 150819A: Swift-BAT refined analysis
  66. GRB 150819A: Swift/UVOT Upper Limits
  67. GRB 150819A: Enhanced Swift-XRT position
  68. GRB150818A: NOT imaging
  69. GRB 150819A: Swift detection of a burst
  70. GRB 150818A: Swift/UVOT Detection
  71. GRB 150817A: AAO optical observations
  72. GRB 150818A: Enhanced Swift-XRT position
  73. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  74. GRB 150818A: Swift detection of a burst
  75. GRB 150817A: Swift/UVOT Upper Limits
  76. GRB 150817A: Enhanced Swift-XRT position
  77. GRB 150817A: Continued RATIR Observations, Revised Candidate
  78. GRB 150817A: RATIR Optical Afterglow Candidate
  79. GRB 150817A: Swift detection of a burst
  80. GRB 150811A: Continued RATIR Observations
  81. GRB 150811A: Continued RATIR Observations
  82. Swift Trigger 652046 is probably not a GRB
  83. GRB 150811A: Continued RATIR Observations
  84. GRB 150811A: SAO RAS optical observations
  85. GRB 150811A: Enhanced Swift-XRT position
  86. GRB 150811A: Swift/UVOT Detection
  87. GRB 150811A: RATIR Optical Afterglow Detection
  88. GRB 150811A: Swift detection of a burst
  89. GRB 150728A: TNG optical observations
  90. GRB 150727A: IRSF NIR observation
  91. GRB 150801A: Swift-XRT observations
  92. GRB 150801B: Swift/UVOT Upper Limits
  93. GRB 150801B: Swift-XRT refined Analysis
  94. GRB 150801B: Enhanced Swift-XRT position
  95. GRB 150801B: Swift detection of a burst
  96. GRB 150801A: Tiled Swift observations
  97. GRB 150724B: Swift-XRT afterglow detection
  98. GRB 150728A: Continued RATIR Optical Observations
  99. GRB 150728A: TSHAO optical observations
  100. GRB 150728A: RATIR Optical Observations

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