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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"

42870 results found.

  1. GRB 121025A: Confirmation of the X-ray afterglow
  2. GRB 121029A Suzaku WAM observation of the prompt emission
  3. GRB 121102A : a long GRB detected by INTEGRAL
  4. GRB 121102A: Swift detection of a burst
  5. GRB 121027A: sub-mm upper limit
  6. GRB 121031A: Swift-BAT refined analysis
  7. GRB 121031A: Prompt enhanced Swift-XRT position
  8. GRB 121031A: Swift detection of a burst
  9. Swift Quick-look and HEASARC are back online
  10. GRB 121027A: Swift/UVOT Possible Detection
  11. GRB 121024A: LOAO RIzY Observation
  12. GRB 121027A: X-shooter redshift confirmation
  13. GRB 121027A - Gemini South spectroscopy
  14. GRB 121028A: near-IR observations at Calar Alto
  15. GRB 121027A: GROND Confirmation of Rebrightening
  16. GRB 121029A: Fermi GBM detection
  17. GRB 121028A: RAPTOR Limits During Gamma-Ray Emitting Interval
  18. Swift Quick-look and HEASARC will be offline for due to hurricane Sandy
  19. GRB 121027A: MASTER early prompt optical limit
  20. GRB 121027A: Swift-XRT refined Analysis
  21. GRB 121027A: Brightening IR counterpart
  22. GRB 121028A: Swift-XRT refined Analysis
  23. GRB 121028A: Enhanced Swift-XRT position
  24. GRB 121028A: Swift-BAT refined analysis
  25. GRB 121027A: Enhanced Swift-XRT position
  26. GRB 121028A: Faulkes Telescope North observations
  27. GRB 121028A: Swift detection of a burst
  28. GRB 121011A: optical observations
  29. GRB 121027A: nIR afterglow candidate with AAT
  30. GRB 121027A: Swift-BAT refined analysis
  31. GRB 121025A: Swift-XRT observation
  32. GRB 121027A: MAXI/GSC detection 40 minutes after the Swift Trigger
  33. GRB 121027A: Swift detection of a burst
  34. Swift Quick-look and HEASARC will be offline for 24 hours this weekend
  35. GRB 121024A: EVLA Detection
  36. Swift-BAT trigger 536502 is not astrophysical
  37. GRB 121024A: CARMA 3mm Detection
  38. GRB 121024A: Swift-BAT refined analysis
  39. GRB 121024A: GMG optical observation
  40. GRB 121025A: MAXI/GSC detection
  41. GRB 121024A: Enhanced Swift-XRT position
  42. GRB 121024A: PAIRITEL NIR Detection
  43. GRB 121024A: Swift-XRT refined Analysis
  44. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  45. GRB 121024A: VLT/X-shooter redshift
  46. Skynet PROMPT/Dolomiti observations of GRB121024A
  47. GRB 121024A: BOOTES-1B optical detection
  48. GRB 121024A: TAROT Calern observatory optical detection of a bright counterpart
  49. GRB 121024A: Swift detection of a burst with an optical counterpart
  50. Swift Trigger 536502 is likely a noise fluctuation in coincidence with SAX J1818.6-1703
  51. GRB 121011A: early optical light curve
  52. GRB 121017A: Swift/UVOT Upper Limits
  53. GRB 121017A: Swift-XRT refined Analysis
  54. GRB 121017A: GROND Observations
  55. GRB 121017A: Swift-BAT refined analysis
  56. GRB 121017A: Enhanced Swift-XRT position
  57. GRB 121017A: 1.23m CAHA R-band observations
  58. GRB 121017A optical observations
  59. GRB 121017A: BOOTES-2/TELMA observations
  60. GRB 121017A: Swift detection of a burst
  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. PdB IRAM observation of GRB 121011A
  65. Konus-Wind observation of GRB 121011B
  66. GRB 121014A: Swift-BAT refined analysis
  67. GRB 121011A: WSRT radio observation
  68. GRB 121014A: Swift detection of a burst
  69. INTEGRAL Alert n.6678: NOT A GRB
  70. GRB 121011A: Swift/UVOT Detection
  71. IPN Triangulation of short hard GRB 121011B
  72. GRB 121011A: NOT redshift retraction
  73. GRB 121011A: misprint in GCNC 13854
  74. GRB 121011A: Fermi GBM observation
  75. GRB 121011A: Fermi-LAT detection of a burst
  76. Swift-BAT trigger 535733 is not astrophysical
  77. GRB 121011A: Swift-XRT refined Analysis
  78. GRB 121011A: NOT optical observations
  79. GRB 121011A: optical observations
  80. GRB 121011A: MASTER-Net bell light curve
  81. GRB 121011A: TNG optical observations
  82. GRB 121011A, Swift-BAT refined analysis
  83. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  84. GRB 121011A: Enhanced Swift-XRT position
  85. Planned XMM-Newton and IRAM observation of GRB 121011A
  86. GRB 121011A: MASTER-Net early OT light curve
  87. GRB121011A : Xinglong TNT optical observation
  88. GRB 121011A: Swift detection of a burst with optical afterglow
  89. Trigger 535747: Swift detection of an outburst from SGR1806-20
  90. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  91. GRB 120927A: optical upper limit
  92. GRB 120804A: Late-time Chandra observation
  93. GRB 121001A: GROND Afterglow Confirmation
  94. GRB 121001A: Swift-XRT refined Analysis
  95. GRB 121001A: Enhanced Swift-XRT Position
  96. Swift Trigger 535026 is GRB 121001A: Swift-BAT refined analysis
  97. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  98. GRB 121001A: MASTER optical observations
  99. GRB 121001A: possible optical counterpart
  100. Swift Trigger 535026: Galactic Transient or possible GRB

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