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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"

36366 results found.

  1. GRB 230812B: Tautenburg observations
  2. GRB 230815A: Swift detection of a burst
  3. GRB 230812B: AMI-LA radio detection of afterglow candidate
  4. GRB 230812B: continued AbAO optical afterglow observations
  5. GRB 230812B: Optical observaions from Rozhen Observatory
  6. GRB 230812B: Further Bassano Bresciano Observatory optical observations
  7. GRB 230812B: further SAO RAS optical observations
  8. GRB 230812B: Upper limits from a neutrino search with IceCube
  9. GRB 230812B: GRANDMA further observations of ZTF23aaxeacr candidate afterglow
  10. GRB 230814A: BALROG localization (Fermi Trigger 713732101 / GRB 230814788)
  11. GRB 230812B: CrAO ZTSh optical observations
  12. GRB 230814A: Fermi GBM Final Real-time Localization
  13. GRB 230812B: Koshka Zeiss-1000 optical observations
  14. GRB 230812B: GIT optical follow-up
  15. GRB 230812B: Leavitt Observatory optical observations
  16. GRB 230812B : optical observations from Observatoire de Haute-Provence
  17. GRB 230812B: Bassano Bresciano Observatory optical observations
  18. GRB 230812B: Faulkes Telescope North optical afterglow follow-up
  19. GRB 230812B: Osservatorio Astronomico "Nastro Verde" optical observation
  20. GRB 230812B: rest-frame energetics from Konus-Wind observation
  21. GRB 230812B: OASDG optical observations
  22. GRB 230812B: AbAO optical observations
  23. GRB 230812B: Spectroscopy from NOT
  24. GRB 230812B: Redshift from OSIRIS+/GTC
  25. GRB 230812B: Montarrenti Observatory optical observations
  26. GRB 230812B: SAO RAS optical observations
  27. GRB 230812B: Detected Optical Afterglow Candidate
  28. GRB 230812B: GMG - GRANDMA observations
  29. Konus-Wind detection of GRB 230812B
  30. GRB230812B: AGILE/MCAL detection
  31. GRB 230812B: GECAM-C observation of a very bright burst
  32. GRB 230812B: Swift-XRT afterglow detection
  33. GRB 230812: Swift/UVOT Detection
  34. GOTO confirmation and possible host galaxy of GRB230812B optical afterglow
  35. GRB 230812B: Zwicky Transient Facility Identifies Optical Afterglow Candidate of a Fermi GRB (Trigger 713559497)
  36. Fermi GRB 230812B: MASTER optical counterpart
  37. GRB 230812B: KAIT Optical Afterglow Candidate
  38. GRB 230812B: Improved Swift/XRT localization
  39. GRB 230812B: Preliminary Swift/XRT localization
  40. GRB 230812B: Fermi-LAT detection
  41. GRB 230812B: Fermi GBM Observation of a very bright burst
  42. Fermi GRB 230812B: Global MASTER-Net observations report
  43. GRB 230812B: Tiled Swift observations
  44. GRB 230812B: Fermi GBM detection of an extremely bright GRB
  45. GRB 230812B: Fermi GBM Final Real-time Localization
  46. ZTF23aaoohpy/AT2023lcr: JWST spectroscopy confirmation of an associated type Ic-BL supernova
  47. GRB 230812A: Fermi GBM Final Real-time Localization
  48. GRB 230808A: Fermi GBM Detection
  49. GRB 230805B: Swift-BAT refined analysis
  50. GRB 230805B: Iota Scorpii Observatory, La Spezia, Italy upper limit
  51. GRB 230805B: AstroSat CZTI detection
  52. GRB 230808A: Swift/BAT-GUANO detection of a burst
  53. GRB 230808B: Fermi GBM Final Real-time Localization
  54. ZTF23aaoohpy/AT2023lcr: JWST observations consistent with the presence of a supernova
  55. GRB 230808A: Fermi GBM Final Real-time Localization
  56. GRB 230805B : MITSuME Akeno optical upper limits
  57. Fermi GRB 230807A: Global MASTER-Net observations report
  58. GRB 230807A: Fermi GBM Final Real-time Localization
  59. LIGO/Virgo/KAGRA S230805x: Upper limits from Swift/BAT-GUANO
  60. Konus-Wind detection of GRB 230803A
  61. GRB 230805B: Fermi GBM observation
  62. GRB 230805B : OHP/T193 optical upper limit
  63. GRB 230806A: Fermi GBM Final Localization
  64. GRB 230805B: Enhanced Swift-XRT position
  65. GRB 230805B: Swift/UVOT Upper Limits
  66. GRB 230805B: Bassano Bresciano observatory upper limit
  67. GRB 230805B: BOOTES-6/DPRT optical upper limit and 1.5m OSN detection
  68. GRB 230805B: NOT optical afterglow confirmation
  69. GRB 230805B: Swift-XRT refined Analysis
  70. Fermi GRB 230805A: Global MASTER-Net observations report
  71. GRB 230805B: SAO RAS optical observations
  72. Swift GRB 230805B: Global MASTER-Net observations report
  73. GRB 230805B: Swift detection of a burst
  74. GRB 230805A: Fermi GBM Final Real-time Localization
  75. GRB 230802B: AstroSat CZTI detection
  76. GRB 230802A: Fermi GBM observation
  77. GRB 230802A: Swift-BAT refined analysis
  78. GRB 230804A: Fermi GBM Final Real-time Localization
  79. IPN triangulation of GRB 230803A
  80. GRB 230802A: Swift/UVOT Upper Limits
  81. GRB 230803A: AstroSat CZTI detection
  82. LIGO/Virgo/KAGRA S230802aq: AstroSat CZTI non-detection and upper limits
  83. GRB 230803A: Fermi GBM Final Real-time Localization
  84. GRB 230802B: Fermi GBM Final Localization
  85. Swift GRB 230802A: Global MASTER-Net observations report
  86. GRB 230802A: BOOTES-5/JGT optical upper limit
  87. LIGO/Virgo/KAGRA S230802aq: Upper limits from Fermi-GBM Observations
  88. GRB 230802A: Swift-XRT refined Analysis
  89. GRB 230802A: Enhanced Swift-XRT position
  90. LIGO/Virgo S230802aq: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  91. GRB 230802A: Swift detection of a burst
  92. LIGO/Virgo/KAGRA S230731an: Upper limits from Swift/BAT-GUANO
  93. GRB 230723A: SPT-3G millimeter-band transient event inconsistent with IPN position
  94. LIGO/Virgo/KAGRA S230731an: AstroSat CZTI non-detection and upper limits
  95. GRB 230731A: Fermi GBM Final Real-time Localization
  96. GRB 230723A: Detection of candidate millimeter-band radiation by SPT-3G
  97. GRB 230728A: Swift-BAT refined analysis
  98. GRB 230723B: Swift-BAT refined analysis
  99. GRB 230723B: MITSuME Ishigaki optical observation
  100. IceCube-230727A: Upper limits from a search for additional neutrino events in IceCube

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