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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"

32720 results found.

  1. GRB 220403B: LBT observations
  2. Swift GRB 220403B: Global MASTER-Net observations report
  3. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  4. GRB 220403B: Nanshan/NEXT optical afterglow power-law decay
  5. GRB 220403A: Tautenburg observations
  6. Fermi GRB 220403A: Global MASTER-Net observations report
  7. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  8. GRB 220401A: Fermi GBM observation
  9. Fermi GRB 220401B: Global MASTER-Net observations report
  10. Fermi Gamma-ray Burst Monitor trigger 220331776/670444627 is not a GRB
  11. Fermi GRB 220330A: Global MASTER-Net observations report
  12. ZTF22aaajecp/AT2022cmc: 1.3m DFOT Optical observations
  13. GRB 220325A: GRANDMA observations
  14. GRB 220320A: Detection by VZLUSAT-2
  15. Konus-Wind observation of GRB 220320A
  16. GRB 220325A: Swift/UVOT Upper Limits
  17. GRB 211024B: Host galaxy redshift from X-shooter/VLT
  18. GRB 220325A: Swift-BAT refined analysis
  19. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, TSHAO, AbAO)
  20. GRB 220325A: Tautenburg observations
  21. GRB 220325A: LCO Optical Upper Limits
  22. GRB 220325A: Swift-XRT refined Analysis
  23. GRB 220325A: 1.3m DFOT Optical upper limit
  24. Fermi GBM Sub-Threshold Detection of GRB 220325A
  25. GRB 220325A: MASTER Global Robotic Net optical observations
  26. GRB 220323A: AstroSat CZTI detection
  27. GRB 220319A: GRANDMA observations
  28. GRB 220323A: AGILE/MCAL detection
  29. IPN triangulation of GRB 220320A
  30. GRB 220319A: Swift-BAT refined analysis
  31. GRB 220316A: AstroSat CZTI detection
  32. GRB 220320A: AstroSat CZTI detection
  33. GRB 220317A: Fermi GBM detection
  34. GRB 220319A: MITSuME Akeno optical upper limits
  35. GRB220319A: Optical observations from NOT
  36. GRB 220319A: LCO Optical Upper Limit
  37. GRB 220319A: Mondy optical uper limit
  38. GRB 220319A: Swift-XRT refined Analysis
  39. GRB 220319A: MASTER Global Robotic Net optical observations
  40. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  41. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  42. GRB 220310A: MITSuME Akeno optical observation
  43. IceCube-220317A: MASTER Global Robotic Net optical observations
  44. GRB 220315A: MASTER Global Robotic Net optical observations
  45. GRB 220311A: Fermi GBM observation
  46. GRB 220306B: Swift/UVOT Upper Limits
  47. GRB 220311A: MITSuME Akeno optical upper limits
  48. IPN triangulation of GRB 220310A
  49. GRB 220310C: Fermi GBM observation
  50. GRB 210722A: TAROT Reunion observatory optical light curve
  51. GRB 210222B: TAROT Reunion observatory optical light curve
  52. GRB 201021C: TAROT Reunion observatory optical light curve
  53. GRB 220310A: K-800 of Terskol observatory optical upper limit
  54. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  55. Konus-Wind detection of GRB 220310A
  56. GRB 220310C: Swift ToO observations
  57. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  58. GRB 220311A: MASTER OT retraction
  59. ZTF22aabjpxh/AT2022cva (GRB 220219B): evidence of supernova in LBT spectra
  60. GRB 220310A: GIT confirmation of optical afterglow.
  61. GRB 220306B: Nanshan/NEXT optical upper limit
  62. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  63. Fermi GBM Detection of GRB 220308A
  64. GRB 220308A: AGILE detection
  65. GRB 220310A: MASTER optical counterpart detection
  66. GRB 220310A: Swift ToO observations
  67. GRB 220310A: CALET Gamma-Ray Burst Monitor detection
  68. ZTF22aaajecp/AT2022cmc: Hubble Space Telescope Observations
  69. Fermi GRB 220310B: Global MASTER-Net observations report
  70. Konus-Wind detection of GRB 220308A
  71. IceCube-220306A: No significant detection in HAWC
  72. IceCube-220303A: No significant detection in HAWC
  73. ZTF22aabjpxh/AT2022cva: AMI-LA radio observation
  74. CALET Gamma-Ray Burst Monitor detection of GRB 220308A and its possible precursor
  75. Fermi GRB 220309A: Global MASTER-Net observations report
  76. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  77. IPN triangulation of GRB 220308A (long / very bright)
  78. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  79. IPN triangulation of GRB 220305B
  80. GRB 220306B: Tautenburg observations
  81. GRB 220304A Fermi GBM detection
  82. GRB 220306B: Swift-BAT refined analysis
  83. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  84. GRB 220306B: AbAO optical observations, possible afterglow candidate
  85. GRB 220306B: Swift-XRT refined Analysis
  86. GRB 220306B: Fermi GBM observation
  87. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  88. Swift GRB 220306B: Global MASTER-Net observations report
  89. GRB 220305A: Swift-BAT refined analysis
  90. Fermi GBM Sub-Threshold Detection of GRB 220305A
  91. GRB 220305A: Swift-XRT refined Analysis
  92. Fermi GRB 220306A: Global MASTER-Net observations report
  93. Fermi GRB 220305A: Global MASTER-Net observations report
  94. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  95. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  96. Swift GRB 220305A: Global MASTER-Net observations report
  97. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  98. GRB 220302A: Swift/UVOT Upper Limits
  99. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  100. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV

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