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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"

43591 results found.

  1. Konus-Wind observation of GRB 150330A
  2. IPN Triangulation of GRB 150330A (long/very intense)
  3. GRB 150330A: Fermi GBM detection
  4. GRB 150323B: Swift-XRT afterglow detection
  5. GRB 150323C: possible host galaxy detection
  6. GRB 141212A: GMG observation limit
  7. GRB 141220A: GMG observation limit
  8. GRB 141225A: GMG observation limit
  9. GRB 150120B: GMG observation
  10. GRB 150317A: likely host galaxy detection
  11. GRB 150323B: Khureltogot optical observations
  12. GRB 150323A: AAO optical observations
  13. GRB 150220A: Optical observations at Kyiv comet station
  14. GRB 150323C; Konkoly optical observations
  15. GRB 150323A; Konkoly optical observations
  16. Konus-Wind observation of GRB 150323B
  17. Konus-Wind observation of GRB 150323A
  18. GRB 150323C: Mondy optical observations
  19. GRB 150323B : Xinglong TNT upper limit
  20. GRB 150323C, Swift-BAT refined analysis
  21. GRB 150323C: RATIR Optical Afterglow Observations - Errata
  22. GRB 150323C: Swift/UVOT Upper Limits
  23. GRB 150323B: Swift-XRT observations
  24. GRB 150323C: Enhanced Swift-XRT position
  25. GRB 150323C: RATIR Optical Afterglow Observations
  26. GRB 150323C : Xinglong TNT optical observation
  27. GRB 150323C: Swift-XRT refined Analysis
  28. GRB 150323C: Xingming upper limit
  29. GRB 150323A, Swift-BAT refined analysis
  30. GRB150323C: Fermi GBM detection
  31. GRB 150323A: KAIT Optical Observations
  32. GRB 150323C: Nanshan optical afterglow detection
  33. GRB 150323C: Prompt enhanced Swift-XRT position
  34. GRB 150323B: Fermi GBM observation
  35. GRB 150323C: MASTER-net optical observation
  36. GRB 150323C: Swift detection of a burst
  37. GRB 150323B: Swift ToO observations
  38. GRB 150323B detected in ground analysis of Swift-BAT data
  39. GRB 150323A: Swift-XRT refined Analysis
  40. GRB150323A: Swift-UVOT detection of the afterglow
  41. GRB 150323A: Keck redshift
  42. GRB 150323A: Enhanced Swift-XRT position
  43. GRB 150314A: GMG observation limit
  44. GRB 150323A: RATIR Optical Afterglow Observations
  45. GRB 150323A: P60 Optical Afterglow Candidate
  46. GRB 150323A: Swift detection of a burst
  47. Swift Triggers 635788-635794 are probably not real.
  48. Fermi GBM trigger 150319666 is not a GRB
  49. GRB 150318A: Swift-XRT refined Analysis
  50. Confirmation that Swift trigger 635306 is not an astrophysical source
  51. GRB 150318A: Skynet PROMPT-CTIO Observations
  52. GRB 150318A: Swift-BAT refined analysis
  53. GRB 150318A: Swift/UVOT Upper Limits
  54. GRB 150318A : GROND upper limits
  55. Swift Trigger 635306 is probably not an astrophysical source
  56. GRB 150318A: Enhanced Swift-XRT position
  57. GRB 150318A: Swift detection of a burst
  58. GRB 150317A: Swift/UVOT Upper Limits
  59. GRB 150317A: Swift-XRT refined Analysis
  60. GRB 150317A: Swift-BAT refined analysis
  61. GRB 150317A: RATIR Optical Afterglow Detection
  62. GRB 150317A: Enhanced Swift-XRT position
  63. GRB 150317A: NOT optical observations
  64. GRB 150317A: Swift detection of a burst
  65. GRB 150314A: VLA observations
  66. GRB 150314A: Early RAPTOR Detection
  67. GRB 150220A, the review of the sky area in plate archives
  68. GRB 150314A: NOT further optical observations
  69. Konus-Wind observation of GRB 150314A
  70. GRB 150314A: Swift-XRT refined Analysis
  71. GRB 150314A: KAIT Optical Observations
  72. GRB 150314A: P60 observations
  73. GRB 150314A: Redshift from OSIRIS/GTC
  74. GRB 150314A: NOT optical observations
  75. GRB 150314A Swift-BAT refined analysis
  76. GRB 150314A: Swift/UVOT Detection
  77. GRB 150314A: Fermi GBM observation
  78. GRB 150314A: Skynet Yerkes-41 Observations of the Optical Afterglow
  79. GRB 150314A: Fermi-LAT detection
  80. GRB 150314A: Enhanced Swift-XRT position
  81. GRB 150314A: KAIT Optical Candidate
  82. GRB 150314A: Swift detection of a bright burst
  83. GRB 150313A: MAXI/GSC detection
  84. Fermi GBM trigger 150312827 is not a GRB
  85. GRB 150309A: AAO optic upper limit
  86. GRB 150311A: Konus-Wind trigger at 16:16:24 is not a GRB
  87. GRB 150311A: MAXI/GSC possible afterglow detection
  88. GRB 150222A: CrAO optical observation
  89. Konus-Wind observation of GRB 150309A
  90. GRB 150309A: CrAO optic upper limit
  91. GRB 150309A: ISON-Kislovodsk optic upper limit
  92. Fermi GBM trigger 150311331 is not a GRB
  93. GRB 150309A: Swift-BAT refined analysis
  94. GRB 150309A: Fermi GBM detection
  95. GRB150309A: Optical observations at Crni Vrh
  96. GRB 150309A: MASTER prompt optical observation
  97. GRB 150309A: Swift-XRT refined Analysis
  98. GRB 150309A : Liverpool Telescope observations
  99. GRB 150309A: Enhanced Swift-XRT position
  100. GRB 150309A: BOOTES-1 and -2 upper limit

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