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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"

27782 results found.

  1. Konus-Wind observation of GRB 080916A
  2. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  3. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  4. GRB 080916C: Enhanced XRT position
  5. GRB 080916C: Swift/XRT detection of possible afterglow
  6. GRB 080916B: Swift UVOT Refined Analysis
  7. GRB 080916B, Swift-BAT refined analysis
  8. GRB080916A: Refined Swift/UVOT Observations
  9. GRB 080916B: Enhanced Swift-XRT position
  10. GRB 080916C: Fermi LAT observation
  11. GRB 080916C: Fermi GBM Detection
  12. GRB 080916A: Swift XRT refined analysis
  13. GRB 080916A, Swift-BAT refined analysis
  14. GRB 080916B: Swift-XRT afterglow detection
  15. GRB 080916A: Enhanced Swift-XRT position
  16. GRB 080916B: Swift detection of a burst
  17. GRB 080916: REM detection of the NIR afterglow
  18. GRB 080916: Swift detection of a burst with optical afterglow
  19. GRB 080915B, Swift-BAT refined analysis
  20. GRB 080912 : Fermi GBM detection
  21. GRB 080915B: Swift detection of a burst
  22. GRB 080915: Swift/UVOT Upper Limits
  23. GRB 080915: Swift-XRT afterglow detection and analysis
  24. GRB 080915, Swift-BAT refined analysis
  25. GRB 080915: ROTSE-III Optical Limits
  26. GRB 080915: Swift detection of a burst
  27. GRB 080913: Swift-XRT refined analysis
  28. GRB080913: Swift/UVOT Upper Limits
  29. GRB 080913: GROND photo-z
  30. GRB 080913, Swift-BAT refined analysis
  31. GRB 080913: VLT/FORS2 observations
  32. GRB 080913: Enhanced Swift-XRT position
  33. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  34. GRB 080913: Swift detection of a burst
  35. GRB 080906: Watcher observations
  36. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  37. GRB 080906B: Fermi GBM detection
  38. GRB 080905C: Fermi GBM detection
  39. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  40. Swift trigger 324362 (LS I +61 303 ?): XRT
  41. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  42. Swift trigger 324362 (LS I +61 303 ?)
  43. GRB080905A: Swift/UVOT Upper Limits
  44. GRB 080905B: Watcher optical detection
  45. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  46. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  47. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  48. GRB 080905A: Enhanced Swift-XRT position
  49. Swift Trigger 324122 is again known source Swift J1842.5-1124
  50. Swift Trigger 324116 is known source again
  51. Swift Trigger 324112 is known source Swift J1842.5-1124
  52. GRB 080906: Refined Swift/UVOT Observations
  53. GRB 080906: Swift-XRT Refined Analysis
  54. GRB 080906, Swift-BAT refined analysis
  55. GRB 080906: GROND observations of the optical/NIR afterglow
  56. GRB 080905B: Swift-XRT Refined Analysis
  57. GRB 080905B: Refined UVOT Analysis
  58. GRB 080905B: VLT redshift
  59. GRB 080905B: Enhanced Swift-XRT position
  60. GRB 080905B, Swift-BAT refined analysis
  61. GRB 080905A, Swift-BAT refined analysis
  62. GRB 080906: Swift detection of a burst with optical afterglow
  63. GRB 080905A: Swift-XRT Refined Analysis
  64. GRB080825C: Fermi-LAT observations
  65. GRB 080905B: Swift detection of a burst with possible optical counterpart
  66. GRB 080905: R & I-band optical observations
  67. GRB 080905: Swift detection of a probably-short burst
  68. GRB 080903: Swift/UVOT Observations
  69. GRB 080903: Swift-XRT Refined Analysis
  70. GRB 080903: Enhanced Swift-XRT position
  71. GRB 080903, Swift-BAT refined analysis
  72. GRB 080903: Astrotel-Caucasus optical observations
  73. GRB 080903: TAROT Calern observatory optical observations
  74. GRB 080903: ROTSE-III Optical Limits
  75. GRB 080903: Swift detection of a burst
  76. Recent VLA non-detection of SGR 0501+4516
  77. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  78. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  79. GRB080828: Swift/UVOT Upper Limits
  80. SGR 0501+4516: Detection of possible optical counterpart
  81. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  82. GRB080825B: Swift/UVOT Upper Limits
  83. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  84. Swift-BAT trigger 322590 is not a GRB
  85. VLA non-detection of SGR 0501+4516
  86. Radio Detection of SGR 0501+4516: Retraction
  87. Swift trigger 322590: BAT detection of a possible burst
  88. SGR 0501+4516: Decline in Activity
  89. SGR 0501+4516: Proximity to supernova remnant HB9
  90. Enhanced Swift-XRT position of SGR 0501+4516
  91. SGR 0501+4516: Swift XRT measure of the spin period
  92. GRB080823: Fermi Gamma-ray Burst Monitor detection
  93. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  94. GRB080825C: GLAST Burst Monitor detection
  95. GRB 080825B: Swift-XRT team analysis
  96. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  97. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  98. Konus-Wind observations of new SGR 0501+4516
  99. Radio Detection of SGR 0501+4516
  100. SGR 0501+4516: MDM Optical Observations

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