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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"

30477 results found.

  1. GRB 220315A: MASTER Global Robotic Net optical observations
  2. GRB 220311A: Fermi GBM observation
  3. GRB 220306B: Swift/UVOT Upper Limits
  4. GRB 220311A: MITSuME Akeno optical upper limits
  5. IPN triangulation of GRB 220310A
  6. GRB 220310C: Fermi GBM observation
  7. GRB 210722A: TAROT Reunion observatory optical light curve
  8. GRB 210222B: TAROT Reunion observatory optical light curve
  9. GRB 201021C: TAROT Reunion observatory optical light curve
  10. GRB 220310A: K-800 of Terskol observatory optical upper limit
  11. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  12. Konus-Wind detection of GRB 220310A
  13. GRB 220310C: Swift ToO observations
  14. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  15. GRB 220311A: MASTER OT retraction
  16. ZTF22aabjpxh/AT2022cva (GRB 220219B): evidence of supernova in LBT spectra
  17. GRB 220310A: GIT confirmation of optical afterglow.
  18. GRB 220306B: Nanshan/NEXT optical upper limit
  19. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  20. Fermi GBM Detection of GRB 220308A
  21. GRB 220308A: AGILE detection
  22. GRB 220310A: MASTER optical counterpart detection
  23. GRB 220310A: Swift ToO observations
  24. GRB 220310A: CALET Gamma-Ray Burst Monitor detection
  25. ZTF22aaajecp/AT2022cmc: Hubble Space Telescope Observations
  26. Fermi GRB 220310B: Global MASTER-Net observations report
  27. Konus-Wind detection of GRB 220308A
  28. IceCube-220306A: No significant detection in HAWC
  29. IceCube-220303A: No significant detection in HAWC
  30. ZTF22aabjpxh/AT2022cva: AMI-LA radio observation
  31. CALET Gamma-Ray Burst Monitor detection of GRB 220308A and its possible precursor
  32. Fermi GRB 220309A: Global MASTER-Net observations report
  33. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  34. IPN triangulation of GRB 220308A (long / very bright)
  35. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  36. IPN triangulation of GRB 220305B
  37. GRB 220306B: Tautenburg observations
  38. GRB 220304A Fermi GBM detection
  39. GRB 220306B: Swift-BAT refined analysis
  40. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  41. GRB 220306B: AbAO optical observations, possible afterglow candidate
  42. GRB 220306B: Swift-XRT refined Analysis
  43. GRB 220306B: Fermi GBM observation
  44. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  45. Swift GRB 220306B: Global MASTER-Net observations report
  46. GRB 220305A: Swift-BAT refined analysis
  47. Fermi GBM Sub-Threshold Detection of GRB 220305A
  48. GRB 220305A: Swift-XRT refined Analysis
  49. Fermi GRB 220306A: Global MASTER-Net observations report
  50. Fermi GRB 220305A: Global MASTER-Net observations report
  51. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  52. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  53. Swift GRB 220305A: Global MASTER-Net observations report
  54. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  55. GRB 220302A: Swift/UVOT Upper Limits
  56. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  57. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  58. Fermi GRB 220304A: Global MASTER-Net observations report
  59. GRB 220302A: Swift-XRT refined Analysis
  60. ZTF22aaajecp/AT2022cmc: AMI-LA radio detection
  61. ZTF22aaajecp/AT2022cmc: ATCA detection
  62. GRB 220302A: Swift afterglow detection
  63. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  64. Swift GRB 220302A: Global MASTER-Net observations report
  65. GRB 220228A: Fermi GBM observation
  66. GRB 220228A: Fermi-LAT detection
  67. Konus-Wind detection of GRB 220222A
  68. ZTF22aaajecp/AT2022cmc: JCMT SCUBA-2 sub-mm observations
  69. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  70. ZTF22aaajecp/AT2022cmc: Mondy optical observations
  71. IPN triangulation of GRB 220222A
  72. GRB 220101A: The first example of a Petanova
  73. Konus-Wind observation of GRB 220219B
  74. GCN Circ.draft on GRB 220222A
  75. GRB 220219B: Swift-XRT observations
  76. ZTF22aabjpxh/AT2022cva (GRB 220219B): Mondy optical observations
  77. Fermi GRB 220223A: Global MASTER-Net observations report
  78. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  79. ZTF22aabjpxh/AT2022cva: 1.5m OSN optical observation
  80. Fermi GRB 220222B: Global MASTER-Net observations report
  81. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  82. GRB 220219B: Swift ToO observations
  83. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  84. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  85. Fermi GRB 220222A: Global MASTER-Net observations report
  86. ZTF22aabjpxh/AT2022cva: Assy optical observations
  87. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  88. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  89. ZTF22aaajecp/AT2022cmc: Terskol observatory optical observations
  90. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  91. Konus-Wind observation of GRB 220219A
  92. IPN triangulation of GRB 220219A
  93. IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart
  94. ZTF22aaajecp/AT2022cmc: Keck DEIMOS Redshift
  95. GRB 220219A: AGILE/MCAL detection
  96. GRB 220211A: redshift lower limit estimating
  97. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  98. Konus-Wind detection of GRB 220209A
  99. ZTF22aaajecp/AT2022cmc: VLT/X-shooter redshift
  100. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc

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