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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"

26057 results found.

  1. GRB 220403B: Nanshan/NEXT optical afterglow power-law decay
  2. GRB 220403A: Tautenburg observations
  3. GRB 220403B: optical detection by D50
  4. GRB 220403B: Swift detection of a burst with an optical counterpart
  5. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  6. Swift Trigger 1100848 is likely not a GRB
  7. Swift GRB220402.16: Global MASTER-Net observations report
  8. GRB 220325A: GRANDMA observations
  9. GRB 220325A: Swift/UVOT Upper Limits
  10. GRB 211024B: Host galaxy redshift from X-shooter/VLT
  11. GRB 220325A: Swift-BAT refined analysis
  12. GRB 220325A: Tautenburg observations
  13. GRB 220325A: LCO Optical Upper Limits
  14. GRB 220325A: Swift-XRT refined Analysis
  15. GRB 220325A: 1.3m DFOT Optical upper limit
  16. Fermi GBM Sub-Threshold Detection of GRB 220325A
  17. GRB 220325A: Enhanced Swift-XRT position
  18. GRB 220325A: MASTER Global Robotic Net optical observations
  19. GRB 220325A: Swift detection of a burst
  20. GRB 220319A: GRANDMA observations
  21. GRB 220319A: Swift-BAT refined analysis
  22. GRB 220317A: Fermi GBM detection
  23. GRB 220319A: MITSuME Akeno optical upper limits
  24. GRB220319A: Optical observations from NOT
  25. GRB 220319A: LCO Optical Upper Limit
  26. GRB 220319A: Mondy optical uper limit
  27. GRB 220319A: Swift-XRT refined Analysis
  28. GRB 220319A: Enhanced Swift-XRT position
  29. GRB 220319A: MASTER Global Robotic Net optical observations
  30. GRB 220319A: Swift detection of a burst
  31. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  32. GRB 220306B: Swift/UVOT Upper Limits
  33. GRB 220310C: Fermi GBM observation
  34. GRB 210722A: TAROT Reunion observatory optical light curve
  35. GRB 210222B: TAROT Reunion observatory optical light curve
  36. GRB 201021C: TAROT Reunion observatory optical light curve
  37. GRB 220310A: K-800 of Terskol observatory optical upper limit
  38. GRB 220310C: Swift-XRT observations
  39. GRB 220310C: Swift ToO observations
  40. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  41. ZTF22aabjpxh/AT2022cva (GRB 220219B): evidence of supernova in LBT spectra
  42. GRB 220310A: GIT confirmation of optical afterglow.
  43. GRB 220306B: Nanshan/NEXT optical upper limit
  44. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  45. Fermi GBM Detection of GRB 220308A
  46. GRB 220308A: AGILE detection
  47. GRB 220310A: Swift ToO observations
  48. Konus-Wind detection of GRB 220308A
  49. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  50. IPN triangulation of GRB 220308A (long / very bright)
  51. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  52. GRB 220306B: Tautenburg observations
  53. GRB 220304A Fermi GBM detection
  54. GRB 220306B: Swift-BAT refined analysis
  55. GRB 220306B: AbAO optical observations, possible afterglow candidate
  56. GRB 220306B: BOOTES-1 optical upper limit
  57. GRB 220306B: Swift-XRT refined Analysis
  58. GRB 220306B: Fermi GBM observation
  59. GRB 220306B: Enhanced Swift-XRT position
  60. Swift GRB 220306B: Global MASTER-Net observations report
  61. GRB 220305A: Swift-BAT refined analysis
  62. GRB 220306B: Swift detection of a burst
  63. Fermi GBM Sub-Threshold Detection of GRB 220305A
  64. GRB 220305A: Swift-XRT refined Analysis
  65. GRB 220305A: Enhanced Swift-XRT position
  66. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  67. Swift GRB 220305A: Global MASTER-Net observations report
  68. GRB 220305A: Swift-XRT observations
  69. GRB 220305A: Swift detection of a burst
  70. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  71. GRB 220302A: Swift/UVOT Upper Limits
  72. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  73. GRB 220302A: Swift-XRT refined Analysis
  74. GRB 220302A: BOOTES-5/JGT optical upper limit
  75. Swift resumes autonomous slewing
  76. GRB 220302A: Enhanced Swift-XRT position
  77. GRB 220302A: Swift afterglow detection
  78. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  79. Swift GRB 220302A: Global MASTER-Net observations report
  80. GRB 220302A: Swift detection of a burst
  81. GRB 220228A: Fermi-LAT detection
  82. Konus-Wind detection of GRB 220222A
  83. IPN triangulation of GRB 220222A
  84. GRB 220101A: The first example of a Petanova
  85. GCN Circ.draft on GRB 220222A
  86. GRB 220219B: Swift-XRT observations
  87. ZTF22aabjpxh/AT2022cva (GRB 220219B): Mondy optical observations
  88. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  89. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  90. GRB 220219B: Swift ToO observations
  91. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  92. ZTF22aabjpxh/AT2022cva: Assy optical observations
  93. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  94. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  95. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  96. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  97. GRB 220218A: BOOTES-5/JGT optical upper limit
  98. GRB 220218A: Swift detection of a burst
  99. Swift GRB220218.94: Global MASTER-Net observations report
  100. Swift resumes pointed science observations

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