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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"

19613 results found.

  1. GRB 080906: Watcher observations
  2. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  3. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  4. Swift trigger 324362 (LS I +61 303 ?): XRT
  5. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  6. Swift trigger 324362 (LS I +61 303 ?)
  7. GRB080905A: Swift/UVOT Upper Limits
  8. GRB 080905B: Watcher optical detection
  9. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  10. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  11. GRB 080905A: Enhanced Swift-XRT position
  12. Swift Trigger 324122 is again known source Swift J1842.5-1124
  13. Swift Trigger 324116 is known source again
  14. Swift Trigger 324112 is known source Swift J1842.5-1124
  15. GRB 080906: Refined Swift/UVOT Observations
  16. GRB 080906: Swift-XRT Refined Analysis
  17. GRB 080906, Swift-BAT refined analysis
  18. GRB 080906: GROND observations of the optical/NIR afterglow
  19. GRB 080905B: Swift-XRT Refined Analysis
  20. GRB 080905B: Refined UVOT Analysis
  21. GRB 080905B: Enhanced Swift-XRT position
  22. GRB 080905B, Swift-BAT refined analysis
  23. GRB 080905A, Swift-BAT refined analysis
  24. GRB 080906: Swift detection of a burst with optical afterglow
  25. GRB 080905A: Swift-XRT Refined Analysis
  26. GRB 080905B: Swift detection of a burst with possible optical counterpart
  27. GRB 080905: R & I-band optical observations
  28. GRB 080905: Swift detection of a probably-short burst
  29. GRB 080903: Swift/UVOT Observations
  30. GRB 080903: Swift-XRT Refined Analysis
  31. GRB 080903: Enhanced Swift-XRT position
  32. GRB 080903, Swift-BAT refined analysis
  33. GRB 080903: Astrotel-Caucasus optical observations
  34. GRB 080903: TAROT Calern observatory optical observations
  35. GRB 080903: ROTSE-III Optical Limits
  36. GRB 080903: Swift detection of a burst
  37. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  38. GRB080828: Swift/UVOT Upper Limits
  39. GRB080825B: Swift/UVOT Upper Limits
  40. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  41. Swift-BAT trigger 322590 is not a GRB
  42. Swift trigger 322590: BAT detection of a possible burst
  43. SGR 0501+4516: Decline in Activity
  44. SGR 0501+4516: Proximity to supernova remnant HB9
  45. Enhanced Swift-XRT position of SGR 0501+4516
  46. SGR 0501+4516: Swift XRT measure of the spin period
  47. GRB 080825B: Swift-XRT team analysis
  48. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  49. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  50. Konus-Wind observations of new SGR 0501+4516
  51. SGR 0501+4516: MDM Optical Observations
  52. GRB 080822B, Swift-BAT refined analysis
  53. SGR 0501+4516: WSRT Radio Observations
  54. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  55. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  56. SGR 0501+4516: optical observations
  57. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  58. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  59. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  60. GRB 080822B: Swift detection of a burst
  61. Third event from SGR 0501+4516
  62. New Soft Gamma Repeater 0501+4516 was GRB 080822
  63. GRB 080822: Swift detection of a short burst
  64. Radio detection of GRB 080810 with the VLA
  65. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  66. GLAST Burst Monitor detection of GRB 080810
  67. GRB 080810: Swift/UVOT Refined Analysis
  68. GRB 080810: D50 optical observation
  69. GRB 080810: Kanazawa optical observation
  70. GRB 080810: Swift-XRT Team refined analysis
  71. GRB 080810: Enhanced Swift-XRT position
  72. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  73. GRB 080810, Swift-BAT refined analysis
  74. GRB 080810: Swift detection of a burst with a bright optical afterglow
  75. GRB 080723B: XMM-Newton observation
  76. GRB 080727B: Late VLT imaging
  77. GRB 080805: Swift-XRT Refined Analysis
  78. GRB 080805: Swift/UVOT Upper Limits
  79. GRB 080804: Swift-XRT Refined Analysis
  80. GRB 080804: Swift/UVOT Refined Analysis
  81. GRB 080805, Swift-BAT refined analysis
  82. GRB 080804, Swift-BAT refined analysis
  83. GRB 080804: Enhanced Swift-XRT position
  84. GRB 080804: Faulkes Telescope South observations
  85. GRB080805 optical limit by "Pi of the Sky"
  86. GRB 080805: Swift detection of a burst
  87. GRB 080804: Swift detection of a burst with optical afterglow
  88. GRB 080804: ROTSE-III Detection of Optical Counterpart
  89. GRB 080802: Swift/UVOT Upper Limits
  90. GRB 080802: Swift-XRT Refined Analysis
  91. GRB 080802, Swift-BAT refined analysis
  92. GRB 080802: Swift detection of a probable burst
  93. GRB 080727C: Suzaku WAM observation of the prompt emission
  94. GRB 080727C: TAROT Calern observatory optical observations
  95. GRB 080727B: GROND redshift limit
  96. GRB 080727C, Swift-BAT refined analysis
  97. GRB 080727C: Swift/UVOT Upper Limits
  98. Konus-Wind observation of GRB 080727B
  99. GRB 080727C: Swift XRT refined analysis
  100. GRB 080727C: Enhanced Swift-XRT position

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