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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"

5183 results found.

  1. Fermi GRB 231116A: Global MASTER-Net observations report
  2. GRB 231115A : MITSuME Akeno and Okayama optical upper limits
  3. GRB 231111A: Swift-XRT refined Analysis
  4. IceCube-231103A: No candidates from the Zwicky Transient Facility
  5. Fermi trigger No 721204446: Global MASTER-Net observations report
  6. Fermi GRB 231108A: Global MASTER-Net observations report
  7. GRB 231104A: 3.6m DOT optical upper limit
  8. Fermi GRB 231103A: Global MASTER-Net observations report
  9. GRB 231104A: AstroSat CZTI detection
  10. GRB 231104A: Swift-XRT refined Analysis
  11. IceCube Alert 231103.39: Global MASTER-Net observations report
  12. Fermi trigger No 720498201: Global MASTER-Net observations report
  13. IceCube-231027A: Upper limits from a search for additional neutrino events in IceCube
  14. GRB 231024A: AKO Optical Counterpart Candidate
  15. LIGO/Virgo/KAGRA S231029ai: Global MASTER-Net observations report
  16. IceCube Alert 231027.18: Global MASTER-Net observations report
  17. LIGO/Virgo/KAGRA S231025t: Global MASTER-Net observations report
  18. LIGO/Virgo/KAGRA S231025a: Global MASTER-Net observations report
  19. IC231004A: GRANDMA observations of AT2023uqf/ZTF23abidzvf candidate
  20. GRB 231024A: Fermi GBM Observation
  21. GRB 231024A: LCOGT and ZTF detections of the GOTO optical counterpart candidate
  22. GRB 231024A: GOTO optical counterpart candidate
  23. GRB 231024A: Fermi GBM Final Localization
  24. Fermi trigger No 719846439: Global MASTER-Net observations report
  25. The photometry of the transient in Messier 31 field: GMG observation
  26. GRB 231012A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705709044)
  27. Fermi GRB 231019A: Global MASTER-Net observations report
  28. IPN triangulation of GRB 231018A
  29. GRB 231017A: JinShan optical upper limit
  30. GRB 231015A: AstroSat CZTI detection
  31. (correction) Discovery of an optical transient with strong flaring activity: a new blazar candidate in the Messier 31 field
  32. Discovery of an optical transient with strong flaring activity: a new blazar candidate in the Messier 31 field.
  33. NuEm-230927A: Swift-XRT follow-up
  34. LIGO/Virgo/KAGRA S230922g: DECam GW-MMADS candidates
  35. LIGO/Virgo/KAGRA S230924an: Identification of a GW compact binary merger candidate
  36. LIGO/Virgo/KAGRA S230922g: Identification of a GW compact binary merger candidate
  37. LIGO/Virgo/KAGRA S230922q: Identification of a GW compact binary merger candidate
  38. Detection of self-absorbed radio emission from GRB 230812B with the JVLA + uGMRT
  39. GRB 230917A: AstroSat CZTI detection
  40. Fermi trigger No 716449174: Global MASTER-Net observations report
  41. LIGO/Virgo/KAGRA S230914ak: Identification of a GW compact binary merger candidate
  42. Fermi GRB 230911B: Global MASTER-Net observations report
  43. GRB 230905B: AstroSat CZTI detection
  44. GRB 230906A: Fermi GBM Final Localizationn
  45. GRB 230904C: Fermi GBM Final Localization
  46. Fermi trigger No 715429986: Global MASTER-Net observations report
  47. Fermi GRB 230903A: Global MASTER-Net observations report
  48. GRB 230903A: Swift detection of a burst
  49. Swift GRB230903.72: Global MASTER-Net observations report
  50. GRB 230812B: Spectroscopic detection of the associated SN 2023pel.
  51. GRB 230827A: VZLUSAT-2 detection
  52. Fermi GRB 230827A: Global MASTER-Net observations report
  53. Swift J1727.8-1613 (GRB 230824A): Osservatorio Astronomico "Nastro Verde" optical observations
  54. Swift J1727.8-1613 (GRB 230824A): Leavitt Observatory optical observations
  55. GRB 230826A: Swift-XRT refined Analysis
  56. Swift J1727.8-1613 (GRB 230824A): Skynet Optical Observations
  57. GRB 230812B: radio detection with the VLA
  58. Fermi trigger No 714618399: Global MASTER-Net observations report
  59. MAXI/GSC detection of Swift J1727.8-1613 (GRB 230824A)
  60. GRB 230824A: AKO Optical Afterglow Candidate
  61. Integral GRB230824.72: Global MASTER-Net observations report
  62. GRB 230824B: AstroSat CZTI detection
  63. Swift GRB230824.58: Global MASTER-Net observations report
  64. LIGO/Virgo/KAGRA S230824r: Identification of a GW compact binary merger candidate
  65. Swift GRB230824.10: Global MASTER-Net observations report
  66. Swift Trigger 1186908 is not a GRB
  67. GRB 230818A: Swift-XRT refined Analysis
  68. GRB 230818A: KGO RC-25 optical observations
  69. Fermi GRB 230818A: Global MASTER-Net observations report
  70. Fermi trigger No 713974668: Global MASTER-Net observations report
  71. Swift GRB230818.98: Global MASTER-Net observations report
  72. GRB 230817A: AstroSat CZTI detection
  73. GRB 230812B: SAO RAS optical observations
  74. GRB 230816A: TShAO and Assy optical observations
  75. IPN triangulation of GRB 230815B
  76. GRB 230815A: Swift-XRT refined Analysis
  77. GRB 230812B: CrAO ZTSh optical observations
  78. GRB 230812B: Osservatorio Astronomico "Nastro Verde" optical observation
  79. GRB 230812B: Montarrenti Observatory optical observations
  80. GRB 230812B: Swift-XRT afterglow detection
  81. GRB 230812B: Zwicky Transient Facility Identifies Optical Afterglow Candidate of a Fermi GRB (Trigger 713559497)
  82. LAT GRB230812.79: Global MASTER-Net observations report
  83. Fermi trigger No 713525317: Global MASTER-Net observations report
  84. GRB 230805B : MITSuME Akeno optical upper limits
  85. Fermi trigger No 712991593: Global MASTER-Net observations report
  86. GRB 230805B: Swift-XRT refined Analysis
  87. GRB 230803A: Fermi GBM Final Real-time Localization
  88. GRB 230802A: Swift-XRT refined Analysis
  89. IceCube-230707A: JCMT/SCUBA-2 submm observations
  90. GRB 230723B: MITSuME Ishigaki optical observation
  91. GRB 230728A: Swift-XRT refined Analysis
  92. IceCube-230724A: No counterparts from the Zwicky Transient Facility
  93. Fermi-LAT gamma-ray observations of IceCube-230724A
  94. IceCube-230725A: Upper limits from a search for additional neutrino events in IceCube
  95. IceCube-230724A: Upper limits from a search for additional neutrino events in IceCube
  96. GRB 230723B: Further CAHA observations and host galaxy detection
  97. GRB 230723B: MITSuME Akeno optical afterglow candidate detection
  98. IceCube-230724A - IceCube observation of a high-energy neutrino candidate track-like event
  99. IceCube Alert 230724.08: Global MASTER-Net observations report
  100. Fermi trigger No 711853834: Global MASTER-Net observations report

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