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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

24541 results found.

  1. GRB 150510A: Fermi GBM detection
  2. GRB 150510A: Fermi-LAT Refined Analysis
  3. GRB 150510A: Fermi-LAT detection
  4. Konus-Wind observation of GRB 150428A
  5. GRB 150423A: Chandra X-ray Observation
  6. Swift Trigger 639636: a possible GRB
  7. GRB 150430A: GROND Upper Limits
  8. GRB 150430A: Swift-BAT refined analysis
  9. Konus-Wind observation of GRB 150430A
  10. GRB 150430A: Fermi GBM Detection
  11. GRB 150430A: MAXI/GSC detection
  12. GRB 150430A: Swift detection of a burst
  13. GRB 150428C: Swift-XRT observations
  14. GRB 150426A: Fermi GBM detection
  15. GRB 150428C: MASTER-net automatic optical inspection
  16. GRB 150428B: MASTER-net prompt optical observation
  17. GRB 150428A: MASTER-net early optical observation
  18. GRB 150428B: Swift-BAT refined analysis
  19. GRB 150428A: Swift-BAT refined analysis
  20. GRB 150428A: Danish1.56m optical observations
  21. GRB 150428A: P60 observations
  22. GRB 150428A: GROND Dark Burst Host Candidate
  23. Trigger 639199: Swift detection of IGRJ16418-4532
  24. GRB 150423A: MITSuME Akeno Optical observation
  25. GRB 150424A: Swift-BAT refined analysis
  26. GRB 150424A: spectral lag, extended-time emission
  27. GRB 150424A: GROND detects strong fading
  28. GRB 150423A: VLT/X-shooter spectroscopy and tentative redshift
  29. GRB 150424B: Fermi GBM detection
  30. Konus-Wind observation of GRB 150424A
  31. GRB 150423A: WHT observations
  32. GRB 150423A: MITSuME Okayama upper limits
  33. GRB 150423A: UKIRT NIR observations
  34. GRB 150423A: Swift-BAT refined analysis
  35. GRB 150422A: Fermi GBM detection
  36. GRB 150423A: Keck optical afterglow confirmation
  37. GRB 150423A: GROND afterglow candidate
  38. GRB 150413A: Konus-Wind and Swift/BAT joint spectral analysis
  39. GRB 150423A: KAIT Optical Upper Limit
  40. GRB 150423A: GROND observation
  41. GRB 150423A: Swift detection of a short burst
  42. Konus-Wind observation of GRB 150418A
  43. GRB150418A: Swift/UVOT did not detect a new source
  44. GRB 150418A: Swift-XRT observations
  45. GRB 150416A: Fermi GBM detection
  46. GRB 150413A: MITSuME Akeno Optical observation
  47. GRB 150416A: Fermi-LAT detection
  48. GRB 150413A : Virtual Telescope optical observations
  49. Konus-Wind observation of a bright burst from SGR 1935+2154
  50. GRB 150413A: T7 and T18 optical observations
  51. GRB 150413A: Swift-BAT refined analysis
  52. GRB150413A, optical observations
  53. IPN Triangulation of a bright burst from SGR 1935+2154
  54. GRB 150413A: P60 photometry
  55. GRB 150413A: Tautenburg observations
  56. GRB 150413A: MASTER bright OT detection
  57. GRB 150413A: Swift detection of a burst
  58. Swift trigger 637807 is probably not an astrophysical source
  59. Swift detection of SAX J1808.4-3658
  60. GRB 150403A: MASTER-net optical observation
  61. Swift triggered on a source in Terzan 5 (trigger=637212)
  62. GRB 150404A: Fermi GBM detection
  63. Konus-Wind observation of GRB 150403A
  64. Fermi trigger 449861706: MASTER-SAAO possible candidate to OT of Short GRB
  65. GRB 150403A: Swift-BAT refined analysis
  66. GRB 150403A: Fermi GBM Detection
  67. GRB 150403A: Swift-XRT refined Analysis
  68. GRB 150403A: Fermi-LAT detection
  69. GRB 150402A: results of Swift observations
  70. Konus-Wind observation of GRB 150330A
  71. IPN Triangulation of GRB 150330A (long/very intense)
  72. GRB 150330A: Fermi GBM detection
  73. GRB 150323C: possible host galaxy detection
  74. GRB 150317A: likely host galaxy detection
  75. GRB 150323C: Nishi-Harima NIR Observations
  76. GRB 150323C: MITSuME Akeno Optical observation
  77. GRB 150323C; Konkoly optical observations
  78. GRB 150323A; Konkoly optical observations
  79. Konus-Wind observation of GRB 150323B
  80. Konus-Wind observation of GRB 150323A
  81. GRB 150323B : Xinglong TNT upper limit
  82. GRB 150323C, Swift-BAT refined analysis
  83. GRB 150323B: Swift-XRT observations
  84. GRB 150323C : Xinglong TNT optical observation
  85. GRB 150323C: Swift-XRT refined Analysis
  86. GRB 150323A, Swift-BAT refined analysis
  87. GRB150323C: Fermi GBM detection
  88. GRB 150323A: KAIT Optical Observations
  89. GRB 150323C: Nanshan optical afterglow detection
  90. GRB 150323B: Fermi GBM observation
  91. GRB 150323C: MASTER-net optical observation
  92. GRB 150323A: Swift-XRT refined Analysis
  93. GRB 150323A: Keck redshift
  94. GRB 150323A: P60 Optical Afterglow Candidate
  95. GRB 150323A: Swift detection of a burst
  96. Swift Triggers 635788-635794 are probably not real.
  97. GRB 150318A: Skynet PROMPT-CTIO Observations
  98. GRB 150318A: Swift-BAT refined analysis
  99. Swift Trigger 635306 is probably not an astrophysical source
  100. GRB 150317A: Swift-BAT refined analysis

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