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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19600 results found.

  1. Swift Trigger 324112 is known source Swift J1842.5-1124
  2. GRB 080906: Refined Swift/UVOT Observations
  3. GRB 080906: Swift-XRT Refined Analysis
  4. GRB 080906, Swift-BAT refined analysis
  5. GRB 080906: GROND observations of the optical/NIR afterglow
  6. GRB 080905B: Swift-XRT Refined Analysis
  7. GRB 080905B: Refined UVOT Analysis
  8. GRB 080905B: Enhanced Swift-XRT position
  9. GRB 080905B, Swift-BAT refined analysis
  10. GRB 080905A, Swift-BAT refined analysis
  11. GRB 080906: Swift detection of a burst with optical afterglow
  12. GRB 080905A: Swift-XRT Refined Analysis
  13. GRB 080905B: Swift detection of a burst with possible optical counterpart
  14. GRB 080905: R & I-band optical observations
  15. GRB 080905: Swift detection of a probably-short burst
  16. GRB 080903: Swift/UVOT Observations
  17. GRB 080903: Swift-XRT Refined Analysis
  18. GRB 080903: Enhanced Swift-XRT position
  19. GRB 080903, Swift-BAT refined analysis
  20. GRB 080903: Astrotel-Caucasus optical observations
  21. GRB 080903: TAROT Calern observatory optical observations
  22. GRB 080903: ROTSE-III Optical Limits
  23. GRB 080903: Swift detection of a burst
  24. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  25. GRB080828: Swift/UVOT Upper Limits
  26. GRB080825B: Swift/UVOT Upper Limits
  27. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  28. Swift-BAT trigger 322590 is not a GRB
  29. Swift trigger 322590: BAT detection of a possible burst
  30. SGR 0501+4516: Decline in Activity
  31. SGR 0501+4516: Proximity to supernova remnant HB9
  32. Enhanced Swift-XRT position of SGR 0501+4516
  33. SGR 0501+4516: Swift XRT measure of the spin period
  34. GRB 080825B: Swift-XRT team analysis
  35. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  36. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  37. Konus-Wind observations of new SGR 0501+4516
  38. SGR 0501+4516: MDM Optical Observations
  39. GRB 080822B, Swift-BAT refined analysis
  40. SGR 0501+4516: WSRT Radio Observations
  41. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  42. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  43. SGR 0501+4516: optical observations
  44. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  45. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  46. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  47. GRB 080822B: Swift detection of a burst
  48. Third event from SGR 0501+4516
  49. New Soft Gamma Repeater 0501+4516 was GRB 080822
  50. GRB 080822: Swift detection of a short burst
  51. Radio detection of GRB 080810 with the VLA
  52. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  53. GLAST Burst Monitor detection of GRB 080810
  54. GRB 080810: Swift/UVOT Refined Analysis
  55. GRB 080810: D50 optical observation
  56. GRB 080810: Kanazawa optical observation
  57. GRB 080810: Swift-XRT Team refined analysis
  58. GRB 080810: Enhanced Swift-XRT position
  59. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  60. GRB 080810, Swift-BAT refined analysis
  61. GRB 080810: Swift detection of a burst with a bright optical afterglow
  62. GRB 080723B: XMM-Newton observation
  63. GRB 080727B: Late VLT imaging
  64. GRB 080805: Swift-XRT Refined Analysis
  65. GRB 080805: Swift/UVOT Upper Limits
  66. GRB 080804: Swift-XRT Refined Analysis
  67. GRB 080804: Swift/UVOT Refined Analysis
  68. GRB 080805, Swift-BAT refined analysis
  69. GRB 080804, Swift-BAT refined analysis
  70. GRB 080804: Enhanced Swift-XRT position
  71. GRB 080804: Faulkes Telescope South observations
  72. GRB080805 optical limit by "Pi of the Sky"
  73. GRB 080805: Swift detection of a burst
  74. GRB 080804: Swift detection of a burst with optical afterglow
  75. GRB 080804: ROTSE-III Detection of Optical Counterpart
  76. GRB 080802: Swift/UVOT Upper Limits
  77. GRB 080802: Swift-XRT Refined Analysis
  78. GRB 080802, Swift-BAT refined analysis
  79. GRB 080802: Swift detection of a probable burst
  80. GRB 080727C: Suzaku WAM observation of the prompt emission
  81. GRB 080727C: TAROT Calern observatory optical observations
  82. GRB 080727B: GROND redshift limit
  83. GRB 080727C, Swift-BAT refined analysis
  84. GRB 080727C: Swift/UVOT Upper Limits
  85. Konus-Wind observation of GRB 080727B
  86. GRB 080727C: Swift XRT refined analysis
  87. GRB 080727C: Enhanced Swift-XRT position
  88. GRB080727C: RTT150 optical observations
  89. GRB 080727C: Swift detection of a burst
  90. Swift detection of XTE J1701-407
  91. GRB 080727B: Swift/UVOT Upper Limits
  92. BAT Trigger 318150 is not a GRB
  93. GRB 080727B: Swift-XRT refined analysis
  94. GRB 080727B, Swift-BAT refined analysis
  95. GRB 080727A, Swift-BAT refined analysis
  96. GRB 080727A: Swift-XRT refined analysis
  97. GRB080727A: Swift/UVOT Upper Limits
  98. GRB 080727B: Enhanced Swift-XRT position
  99. GRB 080727A: Enhanced Swift-XRT position
  100. GRB 080727B: Swift detection of a bright burst

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