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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"

5541 results found.

  1. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  2. GRB 240123B: Fermi GBM Final Real-time Localization
  3. GRB 240122A: MAXI/GSC detection
  4. GRB 240115A: Fermi GBM Observation
  5. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  6. Fermi GRB 240115A: Global MASTER-Net observations report
  7. GRB 240115A: Fermi GBM Final Real-time Localization
  8. GRB 240112C: SAO RAS optical observations
  9. GRB 231215A: radio detection with the VLA
  10. GRB 240107A: MAXI/GSC detection
  11. Fermi trigger No 726347794: Global MASTER-Net observations report
  12. GRB 240102C: AstroSat CZTI detection
  13. Fermi trigger No 725806648: Global MASTER-Net observations report
  14. GRB 231222B: GRBAlpha detection
  15. LIGO/Virgo/KAGRA S231223j: Identification of a GW compact binary merger candidate
  16. Fermi trigger No 724781422: Global MASTER-Net observations report
  17. Fermi trigger No 724278269: Global MASTER-Net observations report
  18. IceCube Alert 231211.03: Global MASTER-Net observations report
  19. Fermi trigger No 723581802: Global MASTER-Net observations report
  20. Fermi trigger No 723435916: Global MASTER-Net observations report
  21. Fermi trigger No 723326169: Global MASTER-Net observations report
  22. IceCube-231202A: Upper limits from a search for additional neutrino events in IceCube
  23. Fermi trigger No 723412808: Global MASTER-Net observations report
  24. GRB 231203A: Fermi GBM Observation
  25. GRB 231204A: Fermi GBM Final Real-time Localization
  26. Fermi trigger No 723279695: Global MASTER-Net observations report
  27. GRB 231129B: MAXI/GSC detection
  28. Fermi trigger No 722507896: Global MASTER-Net observations report
  29. Fermi trigger No 722462310: Global MASTER-Net observations report
  30. Fermi trigger No 722400249: Global MASTER-Net observations report
  31. GRB 231117A: CALET Gamma-Ray Burst Monitor detection
  32. LIGO/Virgo/KAGRA S231119ab: Coverage and upper limits from MAXI/GSC observations
  33. GRB 231117A: MAAO 0.7-m telescope optical upper limit
  34. GRB 231117A: GECAM-C detection
  35. GRB 231117A: GRBAlpha detection
  36. GRB 231117A: REM optical and NIR early-time observations
  37. GRB 231117A (short): Glowbug gamma-ray detection
  38. GRB 231117A: ATLAS non-detection of an optical counterpart
  39. Konus-Wind detection of GRB 231117A (short/hard)
  40. GRB 231115A: optical observations from INAF observatories
  41. GRB 231117A: AGILE detection of a bright short burst
  42. GRB 231117A: AstroSat CZTI detection of a bright short burst
  43. GRB 231117A: Swift detection of a bright short burst
  44. GRB231115A: Liverpool Telescope imaging
  45. GRB 231115A: archival HST observations
  46. Fermi GRB 231115A: Global MASTER-Net observations report
  47. GRB 231111A: GMG observation (correction)
  48. GRB 231111A: GMG observation upper limit
  49. LIGO/Virgo/KAGRA S231110g: Identification of a GW compact binary merger candidate
  50. IceCube-231103A: No candidates from the Zwicky Transient Facility
  51. Fermi trigger No 721204446: Global MASTER-Net observations report
  52. Fermi GRB 231108A: Global MASTER-Net observations report
  53. GRB 231108A: Fermi GBM Final Real-time Localization
  54. Fermi GRB 231106A: Global MASTER-Net observations report
  55. IceCube-231103A: Upper limits from a search for additional neutrino events in IceCube
  56. Fermi-LAT gamma-ray observations of IceCube-231103A
  57. Fermi GRB 231103A: Global MASTER-Net observations report
  58. GRB231104A: LCOGT Optical Upper Limits
  59. IceCube Alert 231103.39: Global MASTER-Net observations report
  60. IceCube-231103A - IceCube observation of a high-energy neutrino candidate track-like event
  61. GRB 231024A: GRANDMA observations of AT2023vuc/GOTO23baj candidate
  62. Fermi trigger No 720498201: Global MASTER-Net observations report
  63. Fermi GRB 231030B: Global MASTER-Net observations report
  64. LIGO/Virgo/KAGRA S231029ai: Global MASTER-Net observations report
  65. Fermi trigger No 720224759: Global MASTER-Net observations report
  66. IceCube Alert 231027.18: Global MASTER-Net observations report
  67. LIGO/Virgo/KAGRA S231025t: Global MASTER-Net observations report
  68. LIGO/Virgo/KAGRA S231025a: Global MASTER-Net observations report
  69. LIGO/Virgo/KAGRA S231025a: two counterpart neutrino candidates from IceCube neutrino searches
  70. IceCube-231004A: Upper limits from a search for additional neutrino events in IceCube
  71. IceCube-231004A: No significant detection in HAWC
  72. GRB 231003A is not a GRB
  73. LIGO/Virgo/KAGRA S230922g: DECam GW-MMADS candidates
  74. LIGO/Virgo/KAGRA S230922g: Identification of a GW compact binary merger candidate
  75. Fermi GBM Statement for Trigger 716527670/230916144
  76. AT2023sva: redshift from OSIRIS+/GTC of the ZTF afterglow
  77. ZTF and SEDM Observations of the Candidate Optical Afterglow AT 2023sva
  78. GRB 230911A: Fermi GBM Observation
  79. Swift GRB230916.13: Global MASTER-Net observations report
  80. GRB 230911A: Swift-XRT afterglow detection
  81. Fermi trigger No 716449174: Global MASTER-Net observations report
  82. GRB 230911A: GOTO optical counterpart candidate
  83. IPN triangulation of GRB 230911D (long)
  84. GRB 230911A: Fermi GBM Final Real-time Localization
  85. GRB 230910A: Fermi GBM Final Real-time Localization
  86. LIGO/Virgo/KAGRA S230908b: one counterpart neutrino candidate from IceCube neutrino searches
  87. GRB 230205A: LBT spectroscopy of two host galaxy candidates
  88. Fermi GRB 230906A: Global MASTER-Net observations report
  89. Fermi trigger No 715429986: Global MASTER-Net observations report
  90. Swift GRB230903.72: Global MASTER-Net observations report
  91. Fermi GRB 230827A: Global MASTER-Net observations report
  92. Trigger 1187142: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  93. Fermi trigger No 714618399: Global MASTER-Net observations report
  94. LIGO/Virgo/KAGRA S230824r: Identification of a GW compact binary merger candidate
  95. LIGO/Virgo/KAGRA S230822bm: Identification of a GW compact binary merger candidate
  96. GRB 230815A: ATCA detection of radio counterpart
  97. GRB 230818A: Tautenburg observations
  98. GRB 230818A: Bassano Bresciano Observatory optical observations
  99. GRB 230818A: KGO RC-25 optical observations
  100. GRB 230818A: Swift/UVOT Detection

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