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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"

5175 results found.

  1. GRB 220521A: ATCA detection
  2. IceCube-220524A - IceCube observation of a high-energy neutrino candidate track-like event
  3. GRB 220521A: MITSuME Akeno optical upper limits
  4. Fermi GRB 220523B: Global MASTER-Net observations report
  5. GRB 220523B: Fermi GBM detection
  6. GRB 220521A: REM optical/NIR upper limits
  7. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  8. GRB 220521A: Swift-XRT refined Analysis
  9. GRB 220514A: AstroSat CZTI detection
  10. GRB 220518A: Swift-XRT refined Analysis
  11. GRB 220514A: MITSuME Akeno optical observation
  12. Konus-Wind detection of GRB 220514B
  13. GRB 220514A: Fermi GBM observation
  14. GRB 220514B: MAXI/GSC detection
  15. GRB 220514A: a long GRB detected by INTEGRAL
  16. GRB 220514A: BALROG localization (Fermi Trigger 674223877 / GRB 220514517)
  17. GRB 220514A: Fermi GBM Final Real-time Localization
  18. IceCube Alert 220513.97: Global MASTER-Net observations report
  19. Fermi GRB 220512A: Global MASTER-Net observations report
  20. GRB 220506A: MITSuME Akeno optical upper limits
  21. GRB 220427A: LCO Optical Observations
  22. GRB 220430A: Swift-XRT refined Analysis
  23. IceCube-220425A: Upper limits from a search for additional neutrino events in IceCube
  24. IceCube-220424A: Upper limits from a search for additional neutrino events in IceCube
  25. GRB 220427A: Swift-XRT refined Analysis
  26. Fermi GRB 220426B: Global MASTER-Net observations report
  27. Fermi-LAT Gamma-ray Observations of IceCube-220424A
  28. IceCube-220424A - IceCube observation of a high-energy neutrino candidate track-like event
  29. IceCube Alert 220424.05: Global MASTER-Net observations report
  30. Fermi GRB 220417A: Global MASTER-Net observations report
  31. Fermi trigger No 671729344: Global MASTER-Net observations report
  32. GRB 220412A: GRANDMA observations
  33. Swift GRB 220412B: Global MASTER-Net observations report
  34. GRB 220412A: MITSuME Akeno optical upper limits
  35. Correction to GCN 31888: GRB 220412A: Swift-XRT refined Analysis
  36. GRB 220412B: MITSuME Akeno optical upper limits
  37. GRB 220412A: Swift-XRT refined Analysis
  38. GRB 220408A: GRANDMA observations
  39. Fermi GRB 220411A: Global MASTER-Net observations report
  40. GRB 220403B: 1.3m DFOT Optical upper limit
  41. GRB 220408B: AstroSat CZTI detection
  42. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, SAO RAS, CrAO)
  43. IceCube Alert 220405.93: Global MASTER-Net observations report
  44. IceCube Alert 220405.21: Global MASTER-Net observations report
  45. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  46. GRB 220403B: Swift-XRT refined Analysis
  47. Fermi GRB 220403A: Global MASTER-Net observations report
  48. Konus-Wind observation of GRB 220320A
  49. GRB 220325A: Swift-XRT refined Analysis
  50. GRB 220324A: AstroSat CZTI detection
  51. GRB 220319A: MITSuME Akeno optical upper limits
  52. GRB 220319A: Swift-XRT refined Analysis
  53. GRB 220310A: MITSuME Akeno optical observation
  54. IceCube-220317A: MASTER Global Robotic Net optical observations
  55. GRB 220311A: MITSuME Akeno optical upper limits
  56. Konus-Wind detection of GRB 220310A
  57. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  58. IceCube-220306A: No significant detection in HAWC
  59. GRB 220306B: Swift-XRT refined Analysis
  60. Swift GRB 220306B: Global MASTER-Net observations report
  61. GRB 220305A: Swift-XRT refined Analysis
  62. Fermi GRB 220306A: Global MASTER-Net observations report
  63. IceCube Alert 220304.74: Global MASTER-Net observations report
  64. Swift resumes autonomous slewing
  65. IceCube-220225A: Upper limits from a search for additional neutrino events in IceCube
  66. ZTF22aaajecp/AT2022cmc: Mondy optical observations
  67. Konus-Wind observation of GRB 220219B
  68. GRB 220222B: Fermi GBM Final Real-time Localization
  69. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  70. IceCube Alert 220220.60: Global MASTER-Net observations report
  71. Fermi trigger No 666962499: Global MASTER-Net observations report
  72. Fermi GRB 220211A: Global MASTER-Net observations report
  73. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  74. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  75. Fermi GRB 220131A: Global MASTER-Net observations report
  76. Fermi trigger No 664738369: Global MASTER-Net observations report
  77. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  78. IPN triangulation of GRB 211226A
  79. GRB 220118A: MITSuME Akeno optical observation
  80. GRB 220117A: MITSuME Akeno optical upper limits
  81. GRB 220117A: Swift-BAT refined analysis
  82. GRB 220117B: Swift-XRT refined Analysis
  83. GRB 220117A: Swift-XRT refined Analysis
  84. GRB 220117B: MITSuME Akeno optical upper limits
  85. GRB 220117A: Swift detection of a burst
  86. Fermi trigger No 663966693: Global MASTER-Net observations report
  87. Fermi trigger No 663927396: Global MASTER-Net observations report
  88. Fermi trigger No 663763320: Global MASTER-Net observations report
  89. Fermi GRB 220111A: Global MASTER-Net observations report
  90. Konus-Wind detection of GRB 220107A
  91. GRB 220107B: MITSuME Akeno optical upper limits
  92. GRB 220107A: MITSuME Akeno optical observation
  93. GRB 220107A: Swift-XRT afterglow detection
  94. GRB 211229B: Fermi GBM observation
  95. GRB 220101A: Swift-XRT refined Analysis
  96. GRB 211227A: Swift-XRT refined Analysis
  97. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  98. GRB 211225A: MITSuME Akeno optical upper limits
  99. GRB 211225A/MAXI J0827-071: MAXI/GSC detection
  100. Fermi trigger No 662084433: Global MASTER-Net observations report

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