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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"

647 results found.

  1. GRB 200227A: Swift-BAT refined analysis
  2. Konus-Wind observation of GRB 200219C
  3. LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC-F30 observations
  4. LIGO/Virgo S200219ac: No counterpart candidates in KAIT observations
  5. Swift GRB200216.56: Global MASTER-Net observations report
  6. LIGO/Virgo S200208q: No counterpart candidates in KAIT observations
  7. GRB 200131A: Swift-XRT refined Analysis
  8. Fermi trigger No 600666048: Global MASTER-Net observations report
  9. LIGO/Virgo S200105ae: Global MASTER-Net observations report
  10. GRB 191227A: Swift-BAT refined analysis
  11. Swift Trigger 946234: further Swift analysis
  12. GRB 191221B: Swift detection of a burst and a very bright optical candidate
  13. LIGO/Virgo S191220af: Global MASTER-Net observations report
  14. Konus-Wind observation of GRB 191218A
  15. LIGO/Virgo S191216ap: Global MASTER-Net observations report
  16. LIGO/Virgo S191212q: Global MASTER-Net observations report
  17. Fermi trigger No 596808579: Global MASTER-Net observations report
  18. GRB 191106A: Swift-BAT refined analysis
  19. GRB 191031D: Swift-BAT refined analysis
  20. GRB 191031C: Swift-BAT refined analysis
  21. GRB 191031A: Swift-BAT refined analysis
  22. TESS Detection of the Optical Emission from the Possible Untriggered GRB Associated with ZTF19abvizsw
  23. Konus-Wind observation of GRB 191004B
  24. GRB 191004A: Swift-BAT refined analysis
  25. LIGO/Virgo S190930t: J-GEM follow-up observation for Swift J221951-484240
  26. LIGO/Virgo S190930s: No counterpart candidates in KAIT observations
  27. Update to the Fermi GBM Localizations
  28. LIGO/Virgo S190910h: Identification of a GW compact binary merger candidate
  29. LIGO/Virgo S190901ap: No counterpart candidates in KAIT observations
  30. LIGO/Virgo S190901ap : GRAWITA photometric observation of candidate ZTFabvizsw and GCN 25618 revision
  31. LIGO/Virgo S190901ap: Upper limits from CALET observations.
  32. LIGO/Virgo S190901ap: Upper limits from Insight-HXMT/HE observations
  33. LIGO/Virgo S190901ap: Upper limits from Fermi-GBM Observations
  34. LIGO/Virgo S190901ap: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
  35. LIGO/Virgo S190828j: No counterpart candidates in KAIT observations
  36. Integral GRB190828.78 Global MASTER-Net observations report
  37. LIGO/Virgo S190814bv: No candidates found in J-GEM follow-up observations
  38. LIGO/Virgo S190728q: Coverage and upper limits from MAXI/GSC observations
  39. LIGO/Virgo S190718y: No counterpart candidates in CNEOST
  40. Fermi trigger No 585007213 Global MASTER-Net observations report
  41. Fermi trigger No 584264100 Global MASTER-Net observations report
  42. LIGO/Virgo S190706ai: No counterpart candidates in KAIT observations
  43. Swift GRB190631. Global MASTER-Net observations report
  44. LIGO/Virgo S190521r: CNEOST follow-up observations
  45. Fermi GRB190520.6 Global MASTER-Net observations report
  46. LIGO/Virgo S190517h: CALET Observations
  47. LIGO/Virgo S190517h: INTEGRAL prompt observation
  48. LIGO/Virgo S190517h: INTEGRAL/SPI-ACS prompt observation
  49. LIGO/Virgo S190510g: J-GEM optical/NIR follow-up observations
  50. LIGO/Virgo S190412m: Further J-GEM optical/NIR observations
  51. GRB 190427A, Swift-BAT refined analysis
  52. LIGO/Virgo S190426c: CNEOST Optical Observations
  53. LIGO/Virgo S190425z: CNEOST Optical Observations
  54. LIGO/Virgo S190426c: SAO optical observation
  55. Fermi GRB190415.17 Global MASTER-Net observations report
  56. MAGIC follow-up of the X-ray flares of LS I +61�303 dete
  57. Swift detection of LS I +61 303
  58. IceCube-190221A: Swift-XRT Follow-up Observations
  59. GRB 190203A: MASTER OT detection
  60. Konus-Wind observation of GRB 190114C
  61. SWIFT GRB190106.57 Global MASTER-Net OT detection
  62. GRB 181126A: Swift/UVOT Upper Limits
  63. GRB 181027A: Fermi GBM detection
  64. GRB 181020A: Swift-XRT refined Analysis
  65. GRB 181010A: REM optical and NIR afterglow detection
  66. Konus-Wind observation of GRB 180828A
  67. GRB 180728B: MASTER optical observations short GRB IPN error box
  68. GRB 180728B: Fermi GBM detection
  69. GRB 180728A: MASTER OT (= new object) detection
  70. GRB 180722A: MASTER second inspection
  71. GRB 180720B: MASTER Global Net OT observations
  72. FRB 180714: MASTER optical inspection of the Fast Rado Burst Transient
  73. GRB 180718A: Fermi GBM detection
  74. Konus-Wind observation of GRB 180623A
  75. GRB 180623A: Swift detection of a burst
  76. GRB 180618A: MASTER OT observation (a short GRB with extended emission)
  77. GRB 180605A: Fermi GBM observation
  78. Konus-Wind observation of GRB 180523A
  79. GRB 180504A: Swift-BAT refined analysis
  80. Konus-Wind observation of GRB 180427A
  81. Konus-Wind observation of GRB 180316A
  82. GRB 180325A: Swift-XRT refined Analysis
  83. GRB 180224A: Swift/UVOT Detection
  84. Konus-Wind observation of GRB 180111A
  85. GRB 180113A: Swift-BAT refined analysis
  86. GRB 180102A: Swift-BAT refined analysis
  87. IceCube-171106A: Konus-Wind upper limits
  88. GRB 171209A: Swift-BAT refined analysis
  89. GRB 171112A: MAXI/GSC detection
  90. IceCube-171106A: Swift Observations
  91. GRB 171027A, Swift-BAT refined analysis
  92. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  93. Numerous Fermi-GBM Subthreshold Notices are due to Swift J0243.6+6
  94. Swift Trigger 775946 is a Galactic transient, not GRB 171003
  95. GRB 171003A: LT early optical observations
  96. GRB 170903A: Swift-BAT refined analysis
  97. Konus-Wind observation of GRB 170822A
  98. LIGO/Virgo G298048: ATCA observations of candidate host galaxies
  99. Konus-Wind observation of GRB 170728B
  100. GRB 170714A, Swift-BAT refined analysis

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