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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"

5173 results found.

  1. GRB 220521A: MITSuME Akeno optical upper limits
  2. Fermi GRB 220523B: Global MASTER-Net observations report
  3. GRB 220523B: Fermi GBM detection
  4. GRB 220521A: REM optical/NIR upper limits
  5. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  6. GRB 220521A: Swift-XRT refined Analysis
  7. GRB 220514A: AstroSat CZTI detection
  8. GRB 220518A: Swift-XRT refined Analysis
  9. GRB 220514A: MITSuME Akeno optical observation
  10. Konus-Wind detection of GRB 220514B
  11. GRB 220514A: Fermi GBM observation
  12. GRB 220514B: MAXI/GSC detection
  13. GRB 220514A: a long GRB detected by INTEGRAL
  14. GRB 220514A: BALROG localization (Fermi Trigger 674223877 / GRB 220514517)
  15. GRB 220514A: Fermi GBM Final Real-time Localization
  16. IceCube Alert 220513.97: Global MASTER-Net observations report
  17. Fermi GRB 220512A: Global MASTER-Net observations report
  18. GRB 220506A: MITSuME Akeno optical upper limits
  19. GRB 220427A: LCO Optical Observations
  20. GRB 220430A: Swift-XRT refined Analysis
  21. IceCube-220425A: Upper limits from a search for additional neutrino events in IceCube
  22. IceCube-220424A: Upper limits from a search for additional neutrino events in IceCube
  23. GRB 220427A: Swift-XRT refined Analysis
  24. Fermi GRB 220426B: Global MASTER-Net observations report
  25. Fermi-LAT Gamma-ray Observations of IceCube-220424A
  26. IceCube-220424A - IceCube observation of a high-energy neutrino candidate track-like event
  27. IceCube Alert 220424.05: Global MASTER-Net observations report
  28. Fermi GRB 220417A: Global MASTER-Net observations report
  29. Fermi trigger No 671729344: Global MASTER-Net observations report
  30. GRB 220412A: GRANDMA observations
  31. Swift GRB 220412B: Global MASTER-Net observations report
  32. GRB 220412A: MITSuME Akeno optical upper limits
  33. Correction to GCN 31888: GRB 220412A: Swift-XRT refined Analysis
  34. GRB 220412B: MITSuME Akeno optical upper limits
  35. GRB 220412A: Swift-XRT refined Analysis
  36. GRB 220408A: GRANDMA observations
  37. Fermi GRB 220411A: Global MASTER-Net observations report
  38. GRB 220403B: 1.3m DFOT Optical upper limit
  39. GRB 220408B: AstroSat CZTI detection
  40. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, SAO RAS, CrAO)
  41. IceCube Alert 220405.93: Global MASTER-Net observations report
  42. IceCube Alert 220405.21: Global MASTER-Net observations report
  43. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  44. GRB 220403B: Swift-XRT refined Analysis
  45. Fermi GRB 220403A: Global MASTER-Net observations report
  46. Konus-Wind observation of GRB 220320A
  47. GRB 220325A: Swift-XRT refined Analysis
  48. GRB 220324A: AstroSat CZTI detection
  49. GRB 220319A: MITSuME Akeno optical upper limits
  50. GRB 220319A: Swift-XRT refined Analysis
  51. GRB 220310A: MITSuME Akeno optical observation
  52. IceCube-220317A: MASTER Global Robotic Net optical observations
  53. GRB 220311A: MITSuME Akeno optical upper limits
  54. Konus-Wind detection of GRB 220310A
  55. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  56. IceCube-220306A: No significant detection in HAWC
  57. GRB 220306B: Swift-XRT refined Analysis
  58. Swift GRB 220306B: Global MASTER-Net observations report
  59. GRB 220305A: Swift-XRT refined Analysis
  60. Fermi GRB 220306A: Global MASTER-Net observations report
  61. IceCube Alert 220304.74: Global MASTER-Net observations report
  62. Swift resumes autonomous slewing
  63. IceCube-220225A: Upper limits from a search for additional neutrino events in IceCube
  64. ZTF22aaajecp/AT2022cmc: Mondy optical observations
  65. Konus-Wind observation of GRB 220219B
  66. GRB 220222B: Fermi GBM Final Real-time Localization
  67. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  68. IceCube Alert 220220.60: Global MASTER-Net observations report
  69. Fermi trigger No 666962499: Global MASTER-Net observations report
  70. Fermi GRB 220211A: Global MASTER-Net observations report
  71. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  72. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  73. Fermi GRB 220131A: Global MASTER-Net observations report
  74. Fermi trigger No 664738369: Global MASTER-Net observations report
  75. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  76. IPN triangulation of GRB 211226A
  77. GRB 220118A: MITSuME Akeno optical observation
  78. GRB 220117A: MITSuME Akeno optical upper limits
  79. GRB 220117A: Swift-BAT refined analysis
  80. GRB 220117B: Swift-XRT refined Analysis
  81. GRB 220117A: Swift-XRT refined Analysis
  82. GRB 220117B: MITSuME Akeno optical upper limits
  83. GRB 220117A: Swift detection of a burst
  84. Fermi trigger No 663966693: Global MASTER-Net observations report
  85. Fermi trigger No 663927396: Global MASTER-Net observations report
  86. Fermi trigger No 663763320: Global MASTER-Net observations report
  87. Fermi GRB 220111A: Global MASTER-Net observations report
  88. Konus-Wind detection of GRB 220107A
  89. GRB 220107B: MITSuME Akeno optical upper limits
  90. GRB 220107A: MITSuME Akeno optical observation
  91. GRB 220107A: Swift-XRT afterglow detection
  92. GRB 211229B: Fermi GBM observation
  93. GRB 220101A: Swift-XRT refined Analysis
  94. GRB 211227A: Swift-XRT refined Analysis
  95. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  96. GRB 211225A: MITSuME Akeno optical upper limits
  97. GRB 211225A/MAXI J0827-071: MAXI/GSC detection
  98. Fermi trigger No 662084433: Global MASTER-Net observations report
  99. GRB 211224A: Fermi GBM Final Real-time Localization
  100. Fermi trigger No 662010159: Global MASTER-Net observations report

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