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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"

21469 results found.

  1. GRB 080913: GROND photo-z
  2. GRB 080913, Swift-BAT refined analysis
  3. GRB 080913: VLT/FORS2 observations
  4. GRB 080913: REM NIR early observations
  5. GRB 080913: Enhanced Swift-XRT position
  6. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  7. GRB 080913: Swift detection of a burst
  8. GRB 080906: Watcher observations
  9. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  10. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  11. Swift trigger 324362 (LS I +61 303 ?): XRT
  12. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  13. Swift trigger 324362 (LS I +61 303 ?)
  14. GRB080905A: Swift/UVOT Upper Limits
  15. GRB 080905B: Watcher optical detection
  16. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  17. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  18. GRB 080905A: Enhanced Swift-XRT position
  19. GRB 080905A: MITSuME Akeno optical upper limits
  20. Swift Trigger 324122 is again known source Swift J1842.5-1124
  21. Swift Trigger 324116 is known source again
  22. Swift Trigger 324112 is known source Swift J1842.5-1124
  23. GRB 080906: Refined Swift/UVOT Observations
  24. GRB 080906: Swift-XRT Refined Analysis
  25. GRB 080906, Swift-BAT refined analysis
  26. GRB 080905A: optical afterglow
  27. GRB 080906: GROND observations of the optical/NIR afterglow
  28. GRB 080905B: Swift-XRT Refined Analysis
  29. GRB 080905B: Refined UVOT Analysis
  30. GRB 080905B: VLT redshift
  31. GRB 080905A: NOT and VLT observations
  32. GRB 080905B: Enhanced Swift-XRT position
  33. GRB 080905B, Swift-BAT refined analysis
  34. GRB 080905A, Swift-BAT refined analysis
  35. GRB 080906: Swift detection of a burst with optical afterglow
  36. GRB 080905A: Swift-XRT Refined Analysis
  37. GRB 080905B: Swift detection of a burst with possible optical counterpart
  38. GRB 080905: R & I-band optical observations
  39. GRB 080905: Swift detection of a probably-short burst
  40. GRB 080903: Swift/UVOT Observations
  41. GRB 080903: Swift-XRT Refined Analysis
  42. GRB 080903: Enhanced Swift-XRT position
  43. GRB 080903, Swift-BAT refined analysis
  44. GRB 080903: Astrotel-Caucasus optical observations
  45. GRB 080903: Optical afterglow candidate
  46. GRB 080903: TAROT Calern observatory optical observations
  47. GRB 080903: ROTSE-III Optical Limits
  48. GRB 080903: Swift detection of a burst
  49. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  50. GRB080828: Swift/UVOT Upper Limits
  51. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  52. GRB080825B: Swift/UVOT Upper Limits
  53. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  54. Swift-BAT trigger 322590 is not a GRB
  55. Swift trigger 322590: BAT detection of a possible burst
  56. SGR 0501+4516: Decline in Activity
  57. SGR 0501+4516: Proximity to supernova remnant HB9
  58. Enhanced Swift-XRT position of SGR 0501+4516
  59. SGR 0501+4516: Swift XRT measure of the spin period
  60. GRB 080825B: Swift-XRT team analysis
  61. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  62. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  63. Konus-Wind observations of new SGR 0501+4516
  64. SGR 0501+4516: MDM Optical Observations
  65. GRB 080822B, Swift-BAT refined analysis
  66. SGR 0501+4516: Astrotel-Caucasus optical observations
  67. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  68. SGR 0501+4516: WSRT Radio Observations
  69. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  70. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  71. SGR 0501+4516: optical observations
  72. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  73. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  74. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  75. GRB 080822B: Swift detection of a burst
  76. Third event from SGR 0501+4516
  77. GRB 080822 (SGR 0501+4516): archival optical observations
  78. New Soft Gamma Repeater 0501+4516 was GRB 080822
  79. GRB 080822: Swift detection of a short burst
  80. Radio detection of GRB 080810 with the VLA
  81. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  82. GLAST Burst Monitor detection of GRB 080810
  83. GRB 080810: Swift/UVOT Refined Analysis
  84. GRB 080810: D50 optical observation
  85. GRB 080810: Kanazawa optical observation
  86. GRB 080810: Swift-XRT Team refined analysis
  87. GRB 080810: Enhanced Swift-XRT position
  88. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  89. GRB 080810, Swift-BAT refined analysis
  90. GRB 080810: Swift detection of a burst with a bright optical afterglow
  91. GRB 080723B: GROND upper limits
  92. GRB 080723B: XMM-Newton observation
  93. GRB 080727B: Late VLT imaging
  94. GRB 080805: Swift-XRT Refined Analysis
  95. GRB 080805: Swift/UVOT Upper Limits
  96. GRB 080804: Swift-XRT Refined Analysis
  97. GRB 080804: Swift/UVOT Refined Analysis
  98. GRB 080805, Swift-BAT refined analysis
  99. GRB 080804, Swift-BAT refined analysis
  100. GRB 080804: Enhanced Swift-XRT position

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