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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"

27593 results found.

  1. GRB 080905C: Fermi GBM detection
  2. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  3. Swift trigger 324362 (LS I +61 303 ?): XRT
  4. Swift trigger 324362 (LS I +61 303 ?)
  5. GRB080905A: Swift/UVOT Upper Limits
  6. GRB 080905B: Watcher optical detection
  7. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  8. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  9. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  10. GRB 080905A: MITSuME Akeno optical upper limits
  11. Swift Trigger 324122 is again known source Swift J1842.5-1124
  12. Swift Trigger 324116 is known source again
  13. Swift Trigger 324112 is known source Swift J1842.5-1124
  14. GRB 080906: Refined Swift/UVOT Observations
  15. GRB 080906: Swift-XRT Refined Analysis
  16. GRB 080906, Swift-BAT refined analysis
  17. GRB 080906: GROND observations of the optical/NIR afterglow
  18. GRB 080905B: Refined UVOT Analysis
  19. GRB 080905B, Swift-BAT refined analysis
  20. GRB 080905A, Swift-BAT refined analysis
  21. GRB 080906: Swift detection of a burst with optical afterglow
  22. GRB 080905A: Swift-XRT Refined Analysis
  23. GRB080825C: Fermi-LAT observations
  24. GRB 080905B: Swift detection of a burst with possible optical counterpart
  25. GRB 080905: Swift detection of a probably-short burst
  26. GRB 080903: Swift/UVOT Observations
  27. GRB 080903: Swift-XRT Refined Analysis
  28. GRB 080903, Swift-BAT refined analysis
  29. GRB 080903: Astrotel-Caucasus optical observations
  30. GRB 080903: TAROT Calern observatory optical observations
  31. GRB 080903: ROTSE-III Optical Limits
  32. GRB 080903: Swift detection of a burst
  33. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  34. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  35. Swift-BAT trigger 322590 is not a GRB
  36. Swift trigger 322590: BAT detection of a possible burst
  37. SGR 0501+4516: XMM-Newton monitoring schedule
  38. SGR 0501+4516: Decline in Activity
  39. GRB080823: Fermi Gamma-ray Burst Monitor detection
  40. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  41. GRB080825C: GLAST Burst Monitor detection
  42. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  43. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  44. GRB 080822B, Swift-BAT refined analysis
  45. SGR 0501+4516: Astrotel-Caucasus optical observations
  46. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  47. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  48. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  49. SGR 0501+4516: optical observations
  50. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  51. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  52. GRB 080822B: Swift detection of a burst
  53. GRB080818B: GLAST Burst Monitor detection
  54. Third event from SGR 0501+4516
  55. New Soft Gamma Repeater 0501+4516 was GRB 080822
  56. GRB 080822: Swift detection of a short burst
  57. GLAST Burst Monitor detection of a GRB: 080816B
  58. GLAST Burst Monitor detection of GRB 080818
  59. GLAST Burst Monitor detection of GRB080817B
  60. GLAST Burst Monitor detection of GRB 080817
  61. GLAST Burst Monitor detection of GRB080816
  62. GLAST Burst Monitor detection of GRB 080812
  63. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  64. GLAST Burst Monitor detection of GRB 080810
  65. GRB 080810: Swift/UVOT Refined Analysis
  66. GRB 080810: Kanazawa optical observation
  67. GRB 080810: Swift-XRT Team refined analysis
  68. GRB 080810: KANATA optical-NIR observation, update
  69. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  70. GRB 080810, Swift-BAT refined analysis
  71. GRB 080810: Swift detection of a burst with a bright optical afterglow
  72. GRB 080723B: XMM-Newton observation
  73. GRB 080805: Swift/UVOT Upper Limits
  74. GRB 080804: Swift/UVOT Refined Analysis
  75. GRB 080805, Swift-BAT refined analysis
  76. GRB 080804, Swift-BAT refined analysis
  77. GRB080805 optical limit by "Pi of the Sky"
  78. GRB 080805: Swift detection of a burst
  79. GRB 080804: Swift detection of a burst with optical afterglow
  80. GRB 080804: ROTSE-III Detection of Optical Counterpart
  81. GRB 080802: Swift/UVOT Upper Limits
  82. GRB 080802: UVI Telescope Upper Limit
  83. GRB 080802, Swift-BAT refined analysis
  84. GRB 080802: Swift detection of a probable burst
  85. GRB 080727C: Suzaku WAM observation of the prompt emission
  86. GRB 080727C: TAROT Calern observatory optical observations
  87. GRB 080727B: GROND redshift limit
  88. GRB 080727C, Swift-BAT refined analysis
  89. GRB 080727C: Swift/UVOT Upper Limits
  90. Konus-Wind observation of GRB 080727B
  91. GRB 080727C: Swift XRT refined analysis
  92. GRB080727C: RTT150 optical observations
  93. GRB 080727C: Swift detection of a burst
  94. Swift detection of XTE J1701-407
  95. GRB 080727B: Swift/UVOT Upper Limits
  96. BAT Trigger 318150 is not a GRB
  97. GRB 080727B: Swift-XRT refined analysis
  98. GRB 080727B, Swift-BAT refined analysis
  99. GRB 080727A, Swift-BAT refined analysis
  100. GRB 080727A: Swift-XRT refined analysis

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