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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"

32685 results found.

  1. IPN triangulation of GRB 240125B (short)
  2. IPN triangulation of GRB 240125A (short)
  3. GRB 240128A: Glowbug gamma-ray detection
  4. GRB 240128A: GRBAlpha detection
  5. GRB 240128A: Tiled Swift observations
  6. GRB 240128A: CALET Gamma-Ray Burst Monitor detection
  7. GRB 240125A: GRBAlpha detection
  8. Fermi GRB 240127A: Global MASTER-Net observations report
  9. GRB 240123C: GRBAlpha detection
  10. GRB 240122A: ATCA detection of radio counterpart
  11. IceCube-240123A: Upper limits from a search for additional neutrino events in IceCube
  12. GRB 240125A: CALET Gamma-Ray Burst Monitor detection
  13. GRB 240125A: AstroSat CZTI detection of a short burst
  14. GRB 240123C: AstroSat CZTI detection
  15. GRB240122A: PRIME near infrared detection
  16. GRB 240123B: Fermi GBM Observation
  17. GRB 240123A: Glowbug gamma-ray detection
  18. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  19. GRB 240123A: GRBAlpha detection
  20. IPN triangulation of GRB 240123C (short)
  21. Fermi-LAT gamma-ray observations of IceCube-240123A
  22. GRB 240123A: further SAO RAS optical observations
  23. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  24. GRB 240123A: Swift-BAT refined analysis
  25. GRB 240123A: Mondy continued optical observations and the PL decay index
  26. GRB 240123A: SAO RAS optical observations
  27. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  28. Fermi/GBM trigger 727752941: BALROG analysis retraction
  29. Fermi GRB 240123B: Global MASTER-Net observations report
  30. GRB 240122A: Swift/UVOT Upper Limits
  31. Fermi GBM Sub-Threshold Detection of GRB 240123A
  32. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  33. GRB 240118A: Swift/UVOT Upper Limits
  34. GRB 240123A: Mondy optical afterglow observations
  35. Konus-Wind detection of GRB 240112A
  36. GRB 240122A: Swift-XRT afterglow detection
  37. GRB 240122A: VLT/X-shooter redshift confirmation
  38. GRB 240122A: Redshift from OSIRIS+/GTC
  39. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  40. GRB 240122A: GOTO optical counterpart candidate
  41. GRB 240122A: Tiled Swift observations
  42. Konus-Wind detection of GRB 240119A (short/hard)
  43. IPN triangulation of GRB 240119A (short)
  44. GRB 240119A: GECAM detection of a short burst
  45. GRB 240118C: GECAM-B detection of a long burst
  46. GRB 240119A: AstroSat CZTI detection of a short burst
  47. GRB 240118A: Mondy optical observations
  48. GRB 240118C: Fermi GBM Observation
  49. Fermi GRB 240119A: Global MASTER-Net observations report
  50. IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER
  51. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  52. GRB 240118A: GRBAlpha detection
  53. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A: correction on the localization
  54. GRB 240115A: Fermi GBM Observation
  55. GRB 240117A: AstroSat CZTI detection
  56. GRB 240118A: Swift ToO observations
  57. GRB 240118A: AbAO optical upper limit
  58. Fermi GRB 240118B: Global MASTER-Net observations report
  59. GRB 240118A: NuSTAR Offline Analysis of the GRB
  60. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  61. Konus-Wind detection of GRB 240118A
  62. GRB 240118A: NuSTAR Detection of a Long GRB
  63. GRB 240118A: Fermi GBM Observation
  64. GRB 240118A: Fermi-LAT detection
  65. GRID detection of GRB 231230A
  66. IPN triangulation of GRB 240112A (long)
  67. Swift Triggers 1209371 through 1209374 are not astrophysical events
  68. Swift Triggers 1209369 and 1209370 are not astrophysical events
  69. GRB 240115B: AstroSat CZTI detection
  70. GRB 240115B: Fermi GBM Detection
  71. IceCube-240105A: ZTF optical observation of blazar PKS 0446+11
  72. GRB 240112D: Glowbug gamma-ray detection
  73. GRB 240112C: Glowbug gamma-ray detection
  74. GRB 240112C: VZLUSAT-2 detection
  75. GRB 240107A: VZLUSAT-2 detection
  76. Fermi GRB 240115B: Global MASTER-Net observations report
  77. GRB 240115B: A long GRB detected by INTEGRAL
  78. Konus-Wind detection of GRB 240112C
  79. Fermi GRB 240115A: Global MASTER-Net observations report
  80. GRB 240112C: GRBAlpha detection
  81. GRB 240112C: Swift/UVOT Detection
  82. GRB 240112C: Fermi GBM Detection
  83. GRB 240112C: SAO RAS optical observations
  84. Fermi GRB 240112D: Global MASTER-Net observations report
  85. Swift GRB 240112C: Global MASTER-Net observations report
  86. Fermi GRB 240112B: Global MASTER-Net observations report
  87. GRB 240109A: Swift-BAT refined analysis
  88. GRB 240109A: Fermi GBM Observation
  89. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  90. GRB 231214A: ATCA Radio Upper Limits
  91. GRB 240106B: Glowbug gamma-ray detection
  92. GRB 240106A: Glowbug gamma-ray detection
  93. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  94. IceCube-240105A: Three candidates from the Zwicky Transient Facility
  95. LIGO/Virgo/KAGRA S240109a: Updated Sky localization
  96. Konus-Wind detection of GRB 240101C
  97. GRB 231215A: radio detection with the VLA
  98. GRB 230818A: further radio observations with the VLA
  99. GRB 230812B: further radio observations with the VLA
  100. GRB 240107A: AstroSat CZTI detection

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