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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"

21525 results found.

  1. GRB 080903: Optical afterglow candidate
  2. GRB 080903: TAROT Calern observatory optical observations
  3. GRB 080903: ROTSE-III Optical Limits
  4. GRB 080903: Swift detection of a burst
  5. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  6. GRB080828: Swift/UVOT Upper Limits
  7. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  8. GRB080825B: Swift/UVOT Upper Limits
  9. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  10. Swift-BAT trigger 322590 is not a GRB
  11. Swift trigger 322590: BAT detection of a possible burst
  12. SGR 0501+4516: Decline in Activity
  13. SGR 0501+4516: Proximity to supernova remnant HB9
  14. Enhanced Swift-XRT position of SGR 0501+4516
  15. SGR 0501+4516: Swift XRT measure of the spin period
  16. GRB 080825B: Swift-XRT team analysis
  17. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  18. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  19. Konus-Wind observations of new SGR 0501+4516
  20. SGR 0501+4516: MDM Optical Observations
  21. GRB 080822B, Swift-BAT refined analysis
  22. SGR 0501+4516: Astrotel-Caucasus optical observations
  23. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  24. SGR 0501+4516: WSRT Radio Observations
  25. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  26. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  27. SGR 0501+4516: optical observations
  28. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  29. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  30. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  31. GRB 080822B: Swift detection of a burst
  32. Third event from SGR 0501+4516
  33. GRB 080822 (SGR 0501+4516): archival optical observations
  34. New Soft Gamma Repeater 0501+4516 was GRB 080822
  35. GRB 080822: Swift detection of a short burst
  36. Radio detection of GRB 080810 with the VLA
  37. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  38. GLAST Burst Monitor detection of GRB 080810
  39. GRB 080810: Swift/UVOT Refined Analysis
  40. GRB 080810: D50 optical observation
  41. GRB 080810: Kanazawa optical observation
  42. GRB 080810: Swift-XRT Team refined analysis
  43. GRB 080810: Enhanced Swift-XRT position
  44. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  45. GRB 080810, Swift-BAT refined analysis
  46. GRB 080810: Swift detection of a burst with a bright optical afterglow
  47. GRB 080723B: GROND upper limits
  48. GRB 080723B: XMM-Newton observation
  49. GRB 080727B: Late VLT imaging
  50. GRB 080805: Swift-XRT Refined Analysis
  51. GRB 080805: Swift/UVOT Upper Limits
  52. GRB 080804: Swift-XRT Refined Analysis
  53. GRB 080804: Swift/UVOT Refined Analysis
  54. GRB 080805, Swift-BAT refined analysis
  55. GRB 080804, Swift-BAT refined analysis
  56. GRB 080804: Enhanced Swift-XRT position
  57. GRB 080804: Faulkes Telescope South observations
  58. GRB080805 optical limit by "Pi of the Sky"
  59. GRB 080805: GROND detection of possible afterglow
  60. GRB 080805: Swift detection of a burst
  61. GRB 080804: Swift detection of a burst with optical afterglow
  62. GRB 080804: ROTSE-III Detection of Optical Counterpart
  63. GRB 080802: Swift/UVOT Upper Limits
  64. GRB 080802: Swift-XRT Refined Analysis
  65. GRB 080802: UVI Telescope Upper Limit
  66. GRB 080802, Swift-BAT refined analysis
  67. GRB 080802: Swift detection of a probable burst
  68. GRB 080727C: Suzaku WAM observation of the prompt emission
  69. GRB 080727A: Early IR observations
  70. GRB 080727C: TAROT Calern observatory optical observations
  71. GRB 080727B: GROND redshift limit
  72. GRB 080727C, Swift-BAT refined analysis
  73. GRB 080727C: Swift/UVOT Upper Limits
  74. Konus-Wind observation of GRB 080727B
  75. GRB 080727C: Swift XRT refined analysis
  76. GRB 080727C: Liverpool Telescope observations
  77. GRB 080727A: VLT upper limits
  78. GRB 080727C: Enhanced Swift-XRT position
  79. GRB080727C: RTT150 optical observations
  80. GRB 080727C: Swift detection of a burst
  81. Swift detection of XTE J1701-407
  82. GRB 080727B: Swift/UVOT Upper Limits
  83. BAT Trigger 318150 is not a GRB
  84. GRB 080727B: Swift-XRT refined analysis
  85. GRB 080727B, Swift-BAT refined analysis
  86. GRB 080727A, Swift-BAT refined analysis
  87. GRB 080727A: Swift-XRT refined analysis
  88. GRB080727A: Swift/UVOT Upper Limits
  89. GRB 080727B: Enhanced Swift-XRT position
  90. GRB 080727A: Enhanced Swift-XRT position
  91. GRB 080727B: REM prompt observations
  92. GRB 080727B: Swift detection of a bright burst
  93. GRB 080727: Swift detection of a burst
  94. GRB 080725, Swift-BAT refined analysis
  95. GRB 080723A: optical upper limit
  96. GRB080723B: Swift/UVOT Upper Limits
  97. GRB 080725: Swift detection of a burst
  98. ATCA radio upper limit on GRB 080723B
  99. GRB 080723A: Swift/UVOT Upper Limits
  100. GRB 080723B - correction to flux conversion factor

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