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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"

24508 results found.

  1. GRB 121117A: Terskol obseravtions
  2. GRB 121123A: Swift/UVOT Observations
  3. IPN Triangulation of GRB 121122A (long/intense)
  4. GRB 121118B: Suzaku WAM observation of the prompt emission
  5. GRB 121125A: Swift-XRT refined Analysis
  6. GRB 121125A: Fermi GBM Observation
  7. GRB 121125A: Swift-BAT refined analysis
  8. GRB 121125A: MASTER-NET optical observations
  9. GRB 121125A: Swift detection of a burst with optical counterpart
  10. GRB 121123A: Swift-BAT refined analysis
  11. GRB 121123A: Swift-XRT refined Analysis
  12. GRB 121123A: NOT optical observations
  13. GRB 121123A: Fermi GBM observation
  14. GRB 121123A: MASTER-NET optical limit
  15. Konus-Wind observation of GRB 121118B
  16. IPN Triangulation of GRB 121118B (long/intense)
  17. IPN Triangulation of GRB 121118A
  18. GRB 121117A: MASTER prompt optical limit
  19. GRB 121117A, Swift-BAT refined analysis
  20. GRB 121117A: ROTSE-III Optical Limits
  21. GRB 121117A: Swift detection of a burst
  22. GRB 121108A, Swift-BAT refined analysis
  23. GRB 121108A: Xinglong TNT upper limit
  24. GRB 121108A: MITSuME Ishigakijima upper limits
  25. GRB 121108A: MASTER early prompt optical limit
  26. GRB 121031A: Fermi GBM detection
  27. GRB 121031A, Early peak observed with Swift-BAT
  28. GRB 121031A: Swift-XRT refined Analysis
  29. GRB 121102A: Swift-BAT refined analysis
  30. GRB 121029A Suzaku WAM observation of the prompt emission
  31. GRB 121102A : a long GRB detected by INTEGRAL
  32. GRB 121031A: Swift-BAT refined analysis
  33. GRB 121031A: Swift detection of a burst
  34. GRB 121024A: LOAO RIzY Observation
  35. GRB 121024A: SMARTS optical/IR afterglow observations
  36. GRB 121027A: GROND Confirmation of Rebrightening
  37. GRB 121029A: Fermi GBM detection
  38. GRB 121028A: RAPTOR Limits During Gamma-Ray Emitting Interval
  39. GRB 121027A: MASTER early prompt optical limit
  40. GRB 121027A: Brightening IR counterpart
  41. GRB 121028A: Swift-BAT refined analysis
  42. GRB 121028A: MITSuME Okayama Optical upper limits
  43. GRB 121028A: Faulkes Telescope North observations
  44. GRB 121027A: Swift-BAT refined analysis
  45. GRB 121025A: Swift-XRT observation
  46. GRB 121027A: MAXI/GSC detection 40 minutes after the Swift Trigger
  47. GRB 121024A: Swift/UVOT Observations
  48. GRB 121024A: Swift-BAT refined analysis
  49. GRB 121024A: GMG optical observation
  50. GRB 121024A: MITSuME Ishigakijima upper limits
  51. GRB 121024A: MITSuME Okayama Optical upper limits
  52. GRB 121024A: PAIRITEL NIR Detection
  53. GRB 121024A: Swift-XRT refined Analysis
  54. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  55. GRB 121024A: BOOTES-1B optical detection
  56. Swift Trigger 536502 is likely a noise fluctuation in coincidence with SAX J1818.6-1703
  57. GRB 121017A: GROND Observations
  58. GRB 121017A: Swift-BAT refined analysis
  59. GRB 121017A: 1.23m CAHA R-band observations
  60. GRB 121017A optical observations
  61. GRB 121011B: Suzaku WAM observation of the prompt emission
  62. GRB 121011A Suzaku WAM observation of the prompt emission
  63. GRB 121012A: Fermi GBM detection
  64. Konus-Wind observation of GRB 121011B
  65. GRB 121014A: Swift-BAT refined analysis
  66. GRB 121014A: Swift detection of a burst
  67. INTEGRAL Alert n.6678: NOT A GRB
  68. GRB 121011A: optical observations
  69. IPN Triangulation of short hard GRB 121011B
  70. GRB 121011A: misprint in GCNC 13854
  71. GRB 121011A: Fermi GBM observation
  72. GRB 121011A: Fermi-LAT detection of a burst
  73. GRB 121011A: NOT optical observations
  74. GRB 121011A: MASTER-Net bell light curve
  75. GRB 121011A: TNG optical observations
  76. GRB 121011A, Swift-BAT refined analysis
  77. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  78. GRB 121011A: MASTER-Net early OT light curve
  79. GRB 121011A: MITSuME Okayama Optical Observation
  80. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  81. GRB 120804A: Late-time Chandra observation
  82. GRB 121001A: GROND Afterglow Confirmation
  83. Swift Trigger 535026 is GRB 121001A: Swift-BAT refined analysis
  84. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  85. GRB 121001A: MASTER optical observations
  86. GRB 121001A: possible optical counterpart
  87. Swift Trigger 535026: ROTSE-III Optical Limits
  88. GRB 120927A, Swift-BAT refined analysis
  89. GRB 120927A: GROND upper limits
  90. GRB 120921A: Fermi GBM detection of its 1000th GRB
  91. GRB 120923A: RAPTOR Early Afterglow Limits
  92. GRB 120923A: MITSuME Okayama Optical upper limits
  93. GRB 120916A Suzaku WAM observation of the prompt emission
  94. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  95. GRB 120923A: GROND Upper limits
  96. GRB 120922A: Fermi GBM detection
  97. GRB 120923A: Swift-BAT refined analysis
  98. GRB 120922A: Swift-BAT refined analysis
  99. GRB 120923A: ROTSE-III Optical Limits
  100. GRB 120923A: Swift detection of a burst

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