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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"

5184 results found.

  1. GRB 121123A: GROND observations
  2. GRB 121123A: Swift-XRT refined Analysis
  3. GRB 121117A: Swift-XRT refined Analysis
  4. GRB 121108A: Swift-XRT refined Analysis
  5. GRB 121102A: Swift-XRT refined Analysis
  6. GRB 121029A Suzaku WAM observation of the prompt emission
  7. Swift Quick-look and HEASARC are back online
  8. GRB 121024A: LOAO RIzY Observation
  9. GRB 121024A: SMARTS optical/IR afterglow observations
  10. GRB 121029A: Fermi GBM detection
  11. Swift Quick-look and HEASARC will be offline for 24 hours this weekend
  12. GRB 121024A: optical observations
  13. GRB 121024A: GMG optical observation
  14. GRB 121024A: MITSuME Ishigakijima upper limits
  15. GRB 121024A: MITSuME Okayama Optical upper limits
  16. GRB 121024A: PAIRITEL NIR Detection
  17. GRB 121024A: Swift-XRT refined Analysis
  18. GRB 121017A: Swift-XRT refined Analysis
  19. GRB 121011B: Suzaku WAM observation of the prompt emission
  20. GRB 121012A: Fermi GBM detection
  21. GRB 121011A: Swift-XRT refined Analysis
  22. GRB 121011A: MASTER-Net bell light curve
  23. GRB121011A : Xinglong TNT optical observation
  24. Trigger 535747: Swift detection of an outburst from SGR1806-20
  25. GRB 121001A: GROND Afterglow Confirmation
  26. GRB 121001A: Swift-XRT refined Analysis
  27. GRB 121001A: Enhanced Swift-XRT Position
  28. Swift Trigger 535026 is GRB 121001A: Swift-BAT refined analysis
  29. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  30. GRB 121001A: possible optical counterpart
  31. Swift Trigger 535026: ROTSE-III Optical Limits
  32. GRB 120927A: Swift-XRT refined Analysis
  33. GRB 120927A: Enhanced Swift-XRT position
  34. GRB 120927A: Swift detection of a burst
  35. GRB 120923A: GROND Upper limits
  36. GRB 120923A: Gemini afterglow detection, high-z candidate
  37. Konus-Wind observation of GRB 120919A
  38. IPN Triangulation of long GRB 120919A
  39. GRB 120919A: Fermi GBM detection
  40. Swift Trigger 533836 is a new Galactic transient
  41. GRB 120911A: Faulkes Telescope North observations
  42. GRB 120907A: Fermi GBM detection
  43. GRB 120907A: Swift detection of a burst with optical counterpart
  44. GRB 120817A: Swift detection of a burst
  45. GRB 120816A: BOOTES-2 observations
  46. GRB 120816A: ROTSE-III Optical Limits
  47. Konus-Wind observation of GRB 120811B
  48. Swift Trigger 530581: GRB 120811A or a galactic transient
  49. GRB 120803A: optical upper limit
  50. GRB 120804A: Konus-Wind and Swift/BAT joint spectral analysis
  51. Fermi/GBM detection of an SGR-like burst
  52. GRB 120804A: Swift-BAT refined analysis
  53. GRB 120803A: Swift detection of a possible burst
  54. IPN Triangulation of GRB 120728B (long/intense)
  55. Swift Trigger 528925 is probably a noise fluctuation
  56. GRB 120724A: optical observation in Maidanak observatory
  57. GRB 120724A: JCMT SCUBA-2 sub-mm observation
  58. GRB 120724A: Gemini-N tentative redshift
  59. GRB 120724A: FTN optical afterglow candidate
  60. Konus-Wind observation of GRB 120707A
  61. GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations
  62. GRB 120624A: Fermi GBM observation
  63. GRB 120624B: Fermi-LAT Detection
  64. Konus-Wind observation of GRB 120624A
  65. GRB 120624B: Fermi GBM detection
  66. IPN Triangulation of GRB 120624A (short/intense)
  67. IPN Triangulation of GRB 120602A (long/very bright)
  68. GRB 120519A: Suzaku WAM observation of the prompt emission
  69. GRB 120512A: Suzaku WAM observation of the prompt emission
  70. IPN Triangulation of GRB 120519A (short/hard)
  71. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  72. GRB 120422A: CARMA 3mm observations
  73. Swift detection of 4U 1630-47
  74. GRB 120424A: MAXI/GSC detection of a burst
  75. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  76. Trigger 519868: Swift detection of SGR1806-20
  77. GRB 120404A: MASTER OT observations
  78. GRB 120404A: MASTER early OT limit
  79. GRB 120402B: Fermi GBM detection
  80. GRB 120401A: Swift detection of a burst
  81. GRB120327A - ATCA radio afterglow detection at 34GHz
  82. GRB 120324A: CrAO optical upper limit
  83. GRB 120324A, the review of the sky area in plate archives
  84. Trigger 518853: Swift detection of a probable Galactic transient
  85. IPN Triangulation of GRB 120328B (long/intense)
  86. GRB 120328A: Swift detection of a burst
  87. GRB 120327A: Swift/UVOT further analysis
  88. GRB 120327A: Swift-BAT refined analysis
  89. GRB 120327A: Enhanced Swift-XRT position
  90. GRB 120327A: Liverpool Telescope Observations
  91. GRB 120327A: Swift detection of a burst with an optical counterpart
  92. GRB 120326A: T17 optical observations
  93. GRB 120324A: CQUEAN rizY Observation
  94. GRB 120324A: Liverpool Telescope optical candidate
  95. Simultaneous optical images of Swift pointing are available by GRT
  96. GRB 120316A : Suzaku WAM observation of the prompt emission
  97. GRB 120312A, the review of the sky area in plate archives
  98. GRB 120312A: WHT candidate afterglow
  99. GRB 120311B: C88 optical limits
  100. GRB 120312A: Swift detection of a burst

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