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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"

32687 results found.

  1. IPN triangulation of GRB 240124B
  2. GRB 240129A: Fermi GBM Observation
  3. IPN triangulation of GRB 240125B (short)
  4. IPN triangulation of GRB 240125A (short)
  5. GRB 240128A: Glowbug gamma-ray detection
  6. GRB 240128A: GRBAlpha detection
  7. GRB 240128A: Tiled Swift observations
  8. GRB 240128A: CALET Gamma-Ray Burst Monitor detection
  9. GRB 240125A: GRBAlpha detection
  10. Fermi GRB 240127A: Global MASTER-Net observations report
  11. GRB 240123C: GRBAlpha detection
  12. GRB 240122A: ATCA detection of radio counterpart
  13. IceCube-240123A: Upper limits from a search for additional neutrino events in IceCube
  14. GRB 240125A: CALET Gamma-Ray Burst Monitor detection
  15. GRB 240125A: AstroSat CZTI detection of a short burst
  16. GRB 240123C: AstroSat CZTI detection
  17. GRB240122A: PRIME near infrared detection
  18. GRB 240123B: Fermi GBM Observation
  19. GRB 240123A: Glowbug gamma-ray detection
  20. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  21. GRB 240123A: GRBAlpha detection
  22. IPN triangulation of GRB 240123C (short)
  23. Fermi-LAT gamma-ray observations of IceCube-240123A
  24. GRB 240123A: further SAO RAS optical observations
  25. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  26. GRB 240123A: Swift-BAT refined analysis
  27. GRB 240123A: Mondy continued optical observations and the PL decay index
  28. GRB 240123A: SAO RAS optical observations
  29. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  30. Fermi/GBM trigger 727752941: BALROG analysis retraction
  31. Fermi GRB 240123B: Global MASTER-Net observations report
  32. GRB 240122A: Swift/UVOT Upper Limits
  33. Fermi GBM Sub-Threshold Detection of GRB 240123A
  34. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  35. GRB 240118A: Swift/UVOT Upper Limits
  36. GRB 240123A: Mondy optical afterglow observations
  37. Konus-Wind detection of GRB 240112A
  38. GRB 240122A: Swift-XRT afterglow detection
  39. GRB 240122A: VLT/X-shooter redshift confirmation
  40. GRB 240122A: Redshift from OSIRIS+/GTC
  41. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  42. GRB 240122A: GOTO optical counterpart candidate
  43. GRB 240122A: Tiled Swift observations
  44. Konus-Wind detection of GRB 240119A (short/hard)
  45. IPN triangulation of GRB 240119A (short)
  46. GRB 240119A: GECAM detection of a short burst
  47. GRB 240118C: GECAM-B detection of a long burst
  48. GRB 240119A: AstroSat CZTI detection of a short burst
  49. GRB 240118A: Mondy optical observations
  50. GRB 240118C: Fermi GBM Observation
  51. Fermi GRB 240119A: Global MASTER-Net observations report
  52. IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER
  53. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  54. GRB 240118A: GRBAlpha detection
  55. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A: correction on the localization
  56. GRB 240115A: Fermi GBM Observation
  57. GRB 240117A: AstroSat CZTI detection
  58. GRB 240118A: Swift ToO observations
  59. GRB 240118A: AbAO optical upper limit
  60. Fermi GRB 240118B: Global MASTER-Net observations report
  61. GRB 240118A: NuSTAR Offline Analysis of the GRB
  62. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  63. Konus-Wind detection of GRB 240118A
  64. GRB 240118A: NuSTAR Detection of a Long GRB
  65. GRB 240118A: Fermi GBM Observation
  66. GRB 240118A: Fermi-LAT detection
  67. GRID detection of GRB 231230A
  68. IPN triangulation of GRB 240112A (long)
  69. Swift Triggers 1209371 through 1209374 are not astrophysical events
  70. Swift Triggers 1209369 and 1209370 are not astrophysical events
  71. GRB 240115B: AstroSat CZTI detection
  72. GRB 240115B: Fermi GBM Detection
  73. IceCube-240105A: ZTF optical observation of blazar PKS 0446+11
  74. GRB 240112D: Glowbug gamma-ray detection
  75. GRB 240112C: Glowbug gamma-ray detection
  76. GRB 240112C: VZLUSAT-2 detection
  77. GRB 240107A: VZLUSAT-2 detection
  78. Fermi GRB 240115B: Global MASTER-Net observations report
  79. GRB 240115B: A long GRB detected by INTEGRAL
  80. Konus-Wind detection of GRB 240112C
  81. Fermi GRB 240115A: Global MASTER-Net observations report
  82. GRB 240112C: GRBAlpha detection
  83. GRB 240112C: Swift/UVOT Detection
  84. GRB 240112C: Fermi GBM Detection
  85. GRB 240112C: SAO RAS optical observations
  86. Fermi GRB 240112D: Global MASTER-Net observations report
  87. Swift GRB 240112C: Global MASTER-Net observations report
  88. Fermi GRB 240112B: Global MASTER-Net observations report
  89. GRB 240109A: Swift-BAT refined analysis
  90. GRB 240109A: Fermi GBM Observation
  91. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  92. GRB 231214A: ATCA Radio Upper Limits
  93. GRB 240106B: Glowbug gamma-ray detection
  94. GRB 240106A: Glowbug gamma-ray detection
  95. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  96. IceCube-240105A: Three candidates from the Zwicky Transient Facility
  97. LIGO/Virgo/KAGRA S240109a: Updated Sky localization
  98. Konus-Wind detection of GRB 240101C
  99. GRB 231215A: radio detection with the VLA
  100. GRB 230818A: further radio observations with the VLA

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