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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"

648 results found.

  1. SGR Swift J1818.0-1607: Swift-BAT refined analysis
  2. GRB 200227A: Swift-BAT refined analysis
  3. Konus-Wind observation of GRB 200219C
  4. LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC-F30 observations
  5. LIGO/Virgo S200219ac: No counterpart candidates in KAIT observations
  6. Swift GRB200216.56: Global MASTER-Net observations report
  7. LIGO/Virgo S200208q: No counterpart candidates in KAIT observations
  8. GRB 200131A: Swift-XRT refined Analysis
  9. Fermi trigger No 600666048: Global MASTER-Net observations report
  10. LIGO/Virgo S200105ae: Global MASTER-Net observations report
  11. GRB 191227A: Swift-BAT refined analysis
  12. Swift Trigger 946234: further Swift analysis
  13. GRB 191221B: Swift detection of a burst and a very bright optical candidate
  14. LIGO/Virgo S191220af: Global MASTER-Net observations report
  15. Konus-Wind observation of GRB 191218A
  16. LIGO/Virgo S191216ap: Global MASTER-Net observations report
  17. LIGO/Virgo S191212q: Global MASTER-Net observations report
  18. Fermi trigger No 596808579: Global MASTER-Net observations report
  19. GRB 191106A: Swift-BAT refined analysis
  20. GRB 191031D: Swift-BAT refined analysis
  21. GRB 191031C: Swift-BAT refined analysis
  22. GRB 191031A: Swift-BAT refined analysis
  23. TESS Detection of the Optical Emission from the Possible Untriggered GRB Associated with ZTF19abvizsw
  24. Konus-Wind observation of GRB 191004B
  25. GRB 191004A: Swift-BAT refined analysis
  26. LIGO/Virgo S190930t: J-GEM follow-up observation for Swift J221951-484240
  27. LIGO/Virgo S190930s: No counterpart candidates in KAIT observations
  28. Update to the Fermi GBM Localizations
  29. LIGO/Virgo S190910h: Identification of a GW compact binary merger candidate
  30. LIGO/Virgo S190901ap: No counterpart candidates in KAIT observations
  31. LIGO/Virgo S190901ap : GRAWITA photometric observation of candidate ZTFabvizsw and GCN 25618 revision
  32. LIGO/Virgo S190901ap: Upper limits from CALET observations.
  33. LIGO/Virgo S190901ap: Upper limits from Insight-HXMT/HE observations
  34. LIGO/Virgo S190901ap: Upper limits from Fermi-GBM Observations
  35. LIGO/Virgo S190901ap: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
  36. LIGO/Virgo S190828j: No counterpart candidates in KAIT observations
  37. Integral GRB190828.78 Global MASTER-Net observations report
  38. LIGO/Virgo S190814bv: No candidates found in J-GEM follow-up observations
  39. LIGO/Virgo S190728q: Coverage and upper limits from MAXI/GSC observations
  40. LIGO/Virgo S190718y: No counterpart candidates in CNEOST
  41. Fermi trigger No 585007213 Global MASTER-Net observations report
  42. Fermi trigger No 584264100 Global MASTER-Net observations report
  43. LIGO/Virgo S190706ai: No counterpart candidates in KAIT observations
  44. Swift GRB190631. Global MASTER-Net observations report
  45. LIGO/Virgo S190521r: CNEOST follow-up observations
  46. Fermi GRB190520.6 Global MASTER-Net observations report
  47. LIGO/Virgo S190517h: CALET Observations
  48. LIGO/Virgo S190517h: INTEGRAL prompt observation
  49. LIGO/Virgo S190517h: INTEGRAL/SPI-ACS prompt observation
  50. LIGO/Virgo S190510g: J-GEM optical/NIR follow-up observations
  51. LIGO/Virgo S190412m: Further J-GEM optical/NIR observations
  52. GRB 190427A, Swift-BAT refined analysis
  53. LIGO/Virgo S190426c: CNEOST Optical Observations
  54. LIGO/Virgo S190425z: CNEOST Optical Observations
  55. LIGO/Virgo S190426c: SAO optical observation
  56. Fermi GRB190415.17 Global MASTER-Net observations report
  57. MAGIC follow-up of the X-ray flares of LS I +61�303 dete
  58. Swift detection of LS I +61 303
  59. IceCube-190221A: Swift-XRT Follow-up Observations
  60. GRB 190203A: MASTER OT detection
  61. Konus-Wind observation of GRB 190114C
  62. SWIFT GRB190106.57 Global MASTER-Net OT detection
  63. GRB 181126A: Swift/UVOT Upper Limits
  64. GRB 181027A: Fermi GBM detection
  65. GRB 181020A: Swift-XRT refined Analysis
  66. GRB 181010A: REM optical and NIR afterglow detection
  67. Konus-Wind observation of GRB 180828A
  68. GRB 180728B: MASTER optical observations short GRB IPN error box
  69. GRB 180728B: Fermi GBM detection
  70. GRB 180728A: MASTER OT (= new object) detection
  71. GRB 180722A: MASTER second inspection
  72. GRB 180720B: MASTER Global Net OT observations
  73. FRB 180714: MASTER optical inspection of the Fast Rado Burst Transient
  74. GRB 180718A: Fermi GBM detection
  75. Konus-Wind observation of GRB 180623A
  76. GRB 180623A: Swift detection of a burst
  77. GRB 180618A: MASTER OT observation (a short GRB with extended emission)
  78. GRB 180605A: Fermi GBM observation
  79. Konus-Wind observation of GRB 180523A
  80. GRB 180504A: Swift-BAT refined analysis
  81. Konus-Wind observation of GRB 180427A
  82. Konus-Wind observation of GRB 180316A
  83. GRB 180325A: Swift-XRT refined Analysis
  84. GRB 180224A: Swift/UVOT Detection
  85. Konus-Wind observation of GRB 180111A
  86. GRB 180113A: Swift-BAT refined analysis
  87. GRB 180102A: Swift-BAT refined analysis
  88. IceCube-171106A: Konus-Wind upper limits
  89. GRB 171209A: Swift-BAT refined analysis
  90. GRB 171112A: MAXI/GSC detection
  91. IceCube-171106A: Swift Observations
  92. GRB 171027A, Swift-BAT refined analysis
  93. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  94. Numerous Fermi-GBM Subthreshold Notices are due to Swift J0243.6+6
  95. Swift Trigger 775946 is a Galactic transient, not GRB 171003
  96. GRB 171003A: LT early optical observations
  97. GRB 170903A: Swift-BAT refined analysis
  98. Konus-Wind observation of GRB 170822A
  99. LIGO/Virgo G298048: ATCA observations of candidate host galaxies
  100. Konus-Wind observation of GRB 170728B

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