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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"

35996 results found.

  1. GRB 220330A: Fermi GBM Final Real-time Localization
  2. GRB 220325A: GRANDMA observations
  3. GRB 220320A: Detection by VZLUSAT-2
  4. Konus-Wind observation of GRB 220320A
  5. GRB 220325A: Swift/UVOT Upper Limits
  6. GRB 211024B: Host galaxy redshift from X-shooter/VLT
  7. GRB 220325A: Swift-BAT refined analysis
  8. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, TSHAO, AbAO)
  9. GRB 220325A: Tautenburg observations
  10. GRB 220326A: Fermi GBM Final Localization
  11. GRB 220325A: LCO Optical Upper Limits
  12. GRB 220325A: Swift-XRT refined Analysis
  13. GRB 220325A: 1.3m DFOT Optical upper limit
  14. GRB 220325B: Fermi GBM Final Localization
  15. Fermi GBM Sub-Threshold Detection of GRB 220325A
  16. GRB 220325A: Enhanced Swift-XRT position
  17. GRB 220325A: MASTER Global Robotic Net optical observations
  18. GRB 220324A: AstroSat CZTI detection
  19. GRB 220325A: Swift detection of a burst
  20. GRB 220323A: AstroSat CZTI detection
  21. GRB 220319A: GRANDMA observations
  22. GRB 220323A: AGILE/MCAL detection
  23. IPN triangulation of GRB 220320A
  24. GRB 220323A: Fermi GBM Final Real-time Localization
  25. GRB 220319A: Swift-BAT refined analysis
  26. GRB 220316A: AstroSat CZTI detection
  27. GRB 220320A: AstroSat CZTI detection
  28. GRB 220317A: Fermi GBM detection
  29. GRB 220321A: Fermi GBM Final Localization
  30. GRB 220319A: MITSuME Akeno optical upper limits
  31. GRB 220319A: LCO Optical Upper Limit
  32. GRB 220319A: Mondy optical uper limit
  33. GRB 220319A: Swift-XRT refined Analysis
  34. GRB 220319A: Enhanced Swift-XRT position
  35. GRB 220319A: MASTER Global Robotic Net optical observations
  36. GRB 220319A: Swift detection of a burst
  37. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  38. GRB 220310A: MITSuME Akeno optical observation
  39. GRB 220317A: Fermi GBM Final Real-time Localization
  40. GRB 220315A: MASTER Global Robotic Net optical observations
  41. GRB 220311A: Fermi GBM observation
  42. GRB 220306B: Swift/UVOT Upper Limits
  43. GRB 220315A: Fermi GBM Final Real-time Localization
  44. GRB 220311A: MITSuME Akeno optical upper limits
  45. IPN triangulation of GRB 220310A
  46. GRB 220310C: Fermi GBM observation
  47. GRB 210722A: TAROT Reunion observatory optical light curve
  48. GRB 210222B: TAROT Reunion observatory optical light curve
  49. GRB 201021C: TAROT Reunion observatory optical light curve
  50. GRB 220310A: K-800 of Terskol observatory optical upper limit
  51. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  52. GRB 220310C: Swift-XRT observations
  53. Konus-Wind detection of GRB 220310A
  54. GRB 220310C: Swift ToO observations
  55. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  56. GRB 220311A: MASTER OT retraction
  57. GRB 220311A: A long GRB detected by INTEGRAL
  58. GRB 220311A: Fermi GBM Final Real-time Localization
  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. GRB 220310C: Fermi GBM Final Real-time Localization
  64. Fermi GBM Detection of GRB 220308A
  65. GRB 220308A: AGILE detection
  66. GRB 220310A: MASTER optical counterpart detection
  67. GRB 220310A: Swift ToO observations
  68. GRB 220310A: CALET Gamma-Ray Burst Monitor detection
  69. Fermi GRB 220310B: Global MASTER-Net observations report
  70. GRB 220310B: Fermi GBM Final Real-time Localization
  71. GRB 220308B: Fermi GBM detection
  72. GRB 220310A: MAXI/GSC detection
  73. Konus-Wind detection of GRB 220308A
  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 220309A: Fermi GBM Final Real-time Localization
  77. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  78. IPN triangulation of GRB 220308A (long / very bright)
  79. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  80. IPN triangulation of GRB 220305B
  81. GRB 220306B: Tautenburg observations
  82. GRB 220304A Fermi GBM detection
  83. GRB 220306B: Swift-BAT refined analysis
  84. GRB 220306B: AbAO optical observations, possible afterglow candidate
  85. GRB 220306B: BOOTES-1 optical upper limit
  86. GRB 220306B: Swift-XRT refined Analysis
  87. GRB 220306B: Fermi GBM observation
  88. GRB 220306B: Enhanced Swift-XRT position
  89. Swift GRB 220306B: Global MASTER-Net observations report
  90. GRB 220305A: Swift-BAT refined analysis
  91. GRB 220306B: Swift detection of a burst
  92. Fermi GBM Sub-Threshold Detection of GRB 220305A
  93. GRB 220305A: Swift-XRT refined Analysis
  94. Fermi GRB 220306A: Global MASTER-Net observations report
  95. GRB 220306A: Fermi GBM Final Real-time Localization
  96. Fermi GRB 220305A: Global MASTER-Net observations report
  97. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  98. GRB 220305A: Fermi GBM observation
  99. GRB 220305A: Enhanced Swift-XRT position
  100. Swift GRB 220305A: Global MASTER-Net observations report

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