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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"

24493 results found.

  1. IPN Triangulation of GRB 121118B (long/intense)
  2. IPN Triangulation of GRB 121118A
  3. GRB 121117A: MASTER prompt optical limit
  4. GRB 121117A, Swift-BAT refined analysis
  5. GRB 121117A: ROTSE-III Optical Limits
  6. GRB 121117A: Swift detection of a burst
  7. GRB 121108A, Swift-BAT refined analysis
  8. GRB 121108A: Xinglong TNT upper limit
  9. GRB 121108A: MITSuME Ishigakijima upper limits
  10. GRB 121108A: MASTER early prompt optical limit
  11. GRB 121031A: Fermi GBM detection
  12. GRB 121031A, Early peak observed with Swift-BAT
  13. GRB 121031A: Swift-XRT refined Analysis
  14. GRB 121102A: Swift-BAT refined analysis
  15. GRB 121029A Suzaku WAM observation of the prompt emission
  16. GRB 121102A : a long GRB detected by INTEGRAL
  17. GRB 121031A: Swift-BAT refined analysis
  18. GRB 121031A: Swift detection of a burst
  19. GRB 121024A: LOAO RIzY Observation
  20. GRB 121024A: SMARTS optical/IR afterglow observations
  21. GRB 121027A: GROND Confirmation of Rebrightening
  22. GRB 121029A: Fermi GBM detection
  23. GRB 121028A: RAPTOR Limits During Gamma-Ray Emitting Interval
  24. GRB 121027A: MASTER early prompt optical limit
  25. GRB 121027A: Brightening IR counterpart
  26. GRB 121028A: Swift-BAT refined analysis
  27. GRB 121028A: MITSuME Okayama Optical upper limits
  28. GRB 121028A: Faulkes Telescope North observations
  29. GRB 121027A: Swift-BAT refined analysis
  30. GRB 121025A: Swift-XRT observation
  31. GRB 121027A: MAXI/GSC detection 40 minutes after the Swift Trigger
  32. GRB 121024A: Swift/UVOT Observations
  33. GRB 121024A: Swift-BAT refined analysis
  34. GRB 121024A: GMG optical observation
  35. GRB 121024A: MITSuME Ishigakijima upper limits
  36. GRB 121024A: MITSuME Okayama Optical upper limits
  37. GRB 121024A: PAIRITEL NIR Detection
  38. GRB 121024A: Swift-XRT refined Analysis
  39. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  40. GRB 121024A: BOOTES-1B optical detection
  41. Swift Trigger 536502 is likely a noise fluctuation in coincidence with SAX J1818.6-1703
  42. GRB 121017A: GROND Observations
  43. GRB 121017A: Swift-BAT refined analysis
  44. GRB 121017A: 1.23m CAHA R-band observations
  45. GRB 121017A optical observations
  46. GRB 121011B: Suzaku WAM observation of the prompt emission
  47. GRB 121011A Suzaku WAM observation of the prompt emission
  48. GRB 121012A: Fermi GBM detection
  49. Konus-Wind observation of GRB 121011B
  50. GRB 121014A: Swift-BAT refined analysis
  51. GRB 121014A: Swift detection of a burst
  52. INTEGRAL Alert n.6678: NOT A GRB
  53. GRB 121011A: optical observations
  54. IPN Triangulation of short hard GRB 121011B
  55. GRB 121011A: misprint in GCNC 13854
  56. GRB 121011A: Fermi GBM observation
  57. GRB 121011A: Fermi-LAT detection of a burst
  58. GRB 121011A: NOT optical observations
  59. GRB 121011A: MASTER-Net bell light curve
  60. GRB 121011A: TNG optical observations
  61. GRB 121011A, Swift-BAT refined analysis
  62. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  63. GRB 121011A: MASTER-Net early OT light curve
  64. GRB 121011A: MITSuME Okayama Optical Observation
  65. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  66. GRB 120804A: Late-time Chandra observation
  67. GRB 121001A: GROND Afterglow Confirmation
  68. Swift Trigger 535026 is GRB 121001A: Swift-BAT refined analysis
  69. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  70. GRB 121001A: MASTER optical observations
  71. GRB 121001A: possible optical counterpart
  72. Swift Trigger 535026: ROTSE-III Optical Limits
  73. GRB 120927A, Swift-BAT refined analysis
  74. GRB 120927A: GROND upper limits
  75. GRB 120921A: Fermi GBM detection of its 1000th GRB
  76. GRB 120923A: RAPTOR Early Afterglow Limits
  77. GRB 120923A: MITSuME Okayama Optical upper limits
  78. GRB 120916A Suzaku WAM observation of the prompt emission
  79. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  80. GRB 120923A: GROND Upper limits
  81. GRB 120922A: Fermi GBM detection
  82. GRB 120923A: Swift-BAT refined analysis
  83. GRB 120922A: Swift-BAT refined analysis
  84. GRB 120923A: ROTSE-III Optical Limits
  85. GRB 120923A: Swift detection of a burst
  86. GRB 120919B: MASTER prompt optical observations
  87. GRB 120919A: Swift-XRT observations
  88. Konus-Wind observation of GRB 120919B
  89. Konus-Wind observation of GRB 120919A
  90. GRB 120919A: Fermi GBM detection
  91. GRB 120918A: Swift-BAT refined analysis
  92. GRB 120916A: Fermi GBM Observation
  93. Konus-Wind observation of GRB 120916A
  94. Swift Trigger 534017 is probably not real.
  95. GRB 120918A: Swift detection of a burst
  96. IPN Triangulation of long GRB 120916A
  97. GRB 120916A: Fermi-LAT detection of a burst
  98. Swift Transient Swift J174510.8-262411: Swift-BAT refined analysis
  99. GRB 120913B: Fermi GBM observation
  100. GRB 120913B: Swift-BAT refined analysis

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