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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"

27135 results found.

  1. LOAO B, R Observations of GRB150413A
  2. Swift Trigger 638217 is probably not an astrophysical source
  3. GRB 150416A: Fermi-LAT detection
  4. GRB 150413A: GMG observation
  5. GRB 150413A: Bassano Bresciano Observatory optical observations
  6. GRB 150413A: Swift-BAT refined analysis
  7. GRB 150413A: P60 photometry
  8. GRB 150413A: Nanshan optical and radio follow-ups
  9. GRB 150413A: Khureltogot optical observations
  10. GRB 150413A: MASTER bright OT detection
  11. GRB 150413A: Swift detection of a burst
  12. Swift trigger 637807 is probably not an astrophysical source
  13. Swift detection of SAX J1808.4-3658
  14. GRB 150407A: Swift detection of a possible burst
  15. GRB 150403A: MASTER-net optical observation
  16. Swift triggered on a source in Terzan 5 (trigger=637212)
  17. GRB 150404A: Fermi GBM detection
  18. Konus-Wind observation of GRB 150403A
  19. Fermi trigger 449861706: MASTER-SAAO possible candidate to OT of Short GRB
  20. GRB 150403A: Swift-BAT refined analysis
  21. GRB 150403A: Fermi GBM Detection
  22. GRB 150403A: Swift/UVOT Detection
  23. GRB 150323C: Khureltogot optical observations
  24. GRB 150403A: Swift-XRT refined Analysis
  25. GRB 150403A: Fermi-LAT detection
  26. GRB 150403A: Swift detection of a burst with an optical counterpart
  27. GRB 150402A: results of Swift observations
  28. GRB 150402A: RATIR Optical Observations
  29. GRB 150402A detected in ground analysis of Swift-BAT data
  30. GRB 150330A: Fermi GBM detection
  31. GRB 141212A: GMG observation limit
  32. GRB 141220A: GMG observation limit
  33. GRB 141225A: GMG observation limit
  34. GRB 150120B: GMG observation
  35. Konus-Wind observation of GRB 150323B
  36. Konus-Wind observation of GRB 150323A
  37. GRB 150323B : Xinglong TNT upper limit
  38. GRB 150323C, Swift-BAT refined analysis
  39. GRB 150323C: Swift/UVOT Upper Limits
  40. GRB 150323C: RATIR Optical Afterglow Observations
  41. GRB 150323C : Xinglong TNT optical observation
  42. GRB 150323C: Swift-XRT refined Analysis
  43. GRB 150323A, Swift-BAT refined analysis
  44. GRB150323C: Fermi GBM detection
  45. GRB 150323B: Fermi GBM observation
  46. GRB 150323C: MASTER-net optical observation
  47. GRB 150323C: Swift detection of a burst
  48. GRB 150323A: Swift-XRT refined Analysis
  49. GRB150323A: Swift-UVOT detection of the afterglow
  50. GRB 150314A: GMG observation limit
  51. GRB 150323A: RATIR Optical Afterglow Observations
  52. GRB 150323A: P60 Optical Afterglow Candidate
  53. GRB 150323A: Swift detection of a burst
  54. Swift Triggers 635788-635794 are probably not real.
  55. Fermi GBM trigger 150319666 is not a GRB
  56. GRB 150318A: Swift-XRT refined Analysis
  57. Confirmation that Swift trigger 635306 is not an astrophysical source
  58. GRB 150318A: Skynet PROMPT-CTIO Observations
  59. GRB 150318A: Swift-BAT refined analysis
  60. GRB 150318A: Swift/UVOT Upper Limits
  61. GRB 150318A : GROND upper limits
  62. Swift Trigger 635306 is probably not an astrophysical source
  63. GRB 150318A: Swift detection of a burst
  64. GRB 150317A: Swift/UVOT Upper Limits
  65. GRB 150317A: Swift-XRT refined Analysis
  66. GRB 150317A: Swift-BAT refined analysis
  67. GRB 150317A: RATIR Optical Afterglow Detection
  68. GRB 150317A: Swift detection of a burst
  69. GRB 150314A: Early RAPTOR Detection
  70. Konus-Wind observation of GRB 150314A
  71. GRB 150314A: Swift-XRT refined Analysis
  72. GRB 150314A: P60 observations
  73. GRB 150314A Swift-BAT refined analysis
  74. GRB 150314A: Swift/UVOT Detection
  75. GRB 150314A: Fermi GBM observation
  76. GRB 150314A: Skynet Yerkes-41 Observations of the Optical Afterglow
  77. GRB 150314A: Fermi-LAT detection
  78. GRB 150314A: Swift detection of a bright burst
  79. Fermi GBM trigger 150312827 is not a GRB
  80. GRB 150311A: Konus-Wind trigger at 16:16:24 is not a GRB
  81. GRB 150311A: MAXI/GSC possible afterglow detection
  82. Konus-Wind observation of GRB 150309A
  83. GRB 150309A: ISON-Kislovodsk optic upper limit
  84. Fermi GBM trigger 150311331 is not a GRB
  85. GRB 150309A: Swift-BAT refined analysis
  86. GRB 150309A: Fermi GBM detection
  87. GRB150309A: Optical observations at Crni Vrh
  88. GRB 150309A: Swift/UVOT Upper Limits
  89. GRB 150309A: MASTER prompt optical observation
  90. GRB 150309A: Swift-XRT refined Analysis
  91. GRB 150309A : Liverpool Telescope observations
  92. GRB 150309A: BOOTES-1 and -2 upper limit
  93. GRB 150309A: Swift detection of a burst
  94. GRB 150305A: Swift XRT confirms weak INTEGRAL event as a new GRB
  95. Fermi GBM trigger 150307942 is not a GRB
  96. Chandra X-ray observations of SWIFT J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka p[PFH2005] 622)
  97. Further UVOT Observations of Swift J0045.2+4151
  98. Fermi GBM trigger 150305751 is not a GRB
  99. Further X-ray observations of Swift J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka [PFH2005] 622)
  100. BAT trigger 633105 (GRB 150301C): NOT r-band upper limit

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