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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"

5164 results found.

  1. GRB 231024A: Fermi GBM Observation
  2. GRB 231024A: LCOGT and ZTF detections of the GOTO optical counterpart candidate
  3. GRB 231024A: GOTO optical counterpart candidate
  4. GRB 231024A: Fermi GBM Final Localization
  5. Fermi trigger No 719846439: Global MASTER-Net observations report
  6. The photometry of the transient in Messier 31 field: GMG observation
  7. GRB 231012A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705709044)
  8. Fermi GRB 231019A: Global MASTER-Net observations report
  9. IPN triangulation of GRB 231018A
  10. GRB 231017A: JinShan optical upper limit
  11. GRB 231015A: AstroSat CZTI detection
  12. (correction) Discovery of an optical transient with strong flaring activity: a new blazar candidate in the Messier 31 field
  13. Discovery of an optical transient with strong flaring activity: a new blazar candidate in the Messier 31 field.
  14. NuEm-230927A: Swift-XRT follow-up
  15. LIGO/Virgo/KAGRA S230922g: DECam GW-MMADS candidates
  16. LIGO/Virgo/KAGRA S230924an: Identification of a GW compact binary merger candidate
  17. LIGO/Virgo/KAGRA S230922g: Identification of a GW compact binary merger candidate
  18. LIGO/Virgo/KAGRA S230922q: Identification of a GW compact binary merger candidate
  19. Detection of self-absorbed radio emission from GRB 230812B with the JVLA + uGMRT
  20. GRB 230917A: AstroSat CZTI detection
  21. Fermi trigger No 716449174: Global MASTER-Net observations report
  22. LIGO/Virgo/KAGRA S230914ak: Identification of a GW compact binary merger candidate
  23. Fermi GRB 230911B: Global MASTER-Net observations report
  24. GRB 230905B: AstroSat CZTI detection
  25. GRB 230906A: Fermi GBM Final Localizationn
  26. GRB 230904C: Fermi GBM Final Localization
  27. Fermi trigger No 715429986: Global MASTER-Net observations report
  28. Fermi GRB 230903A: Global MASTER-Net observations report
  29. GRB 230903A: Swift detection of a burst
  30. Swift GRB230903.72: Global MASTER-Net observations report
  31. GRB 230812B: Spectroscopic detection of the associated SN 2023pel.
  32. GRB 230827A: VZLUSAT-2 detection
  33. Fermi GRB 230827A: Global MASTER-Net observations report
  34. Swift J1727.8-1613 (GRB 230824A): Osservatorio Astronomico "Nastro Verde" optical observations
  35. Swift J1727.8-1613 (GRB 230824A): Leavitt Observatory optical observations
  36. GRB 230826A: Swift-XRT refined Analysis
  37. Swift J1727.8-1613 (GRB 230824A): Skynet Optical Observations
  38. GRB 230812B: radio detection with the VLA
  39. Fermi trigger No 714618399: Global MASTER-Net observations report
  40. MAXI/GSC detection of Swift J1727.8-1613 (GRB 230824A)
  41. GRB 230824A: AKO Optical Afterglow Candidate
  42. Integral GRB230824.72: Global MASTER-Net observations report
  43. GRB 230824B: AstroSat CZTI detection
  44. Swift GRB230824.58: Global MASTER-Net observations report
  45. LIGO/Virgo/KAGRA S230824r: Identification of a GW compact binary merger candidate
  46. Swift GRB230824.10: Global MASTER-Net observations report
  47. Swift Trigger 1186908 is not a GRB
  48. GRB 230818A: Swift-XRT refined Analysis
  49. GRB 230818A: KGO RC-25 optical observations
  50. Fermi GRB 230818A: Global MASTER-Net observations report
  51. Fermi trigger No 713974668: Global MASTER-Net observations report
  52. Swift GRB230818.98: Global MASTER-Net observations report
  53. GRB 230817A: AstroSat CZTI detection
  54. GRB 230812B: SAO RAS optical observations
  55. GRB 230816A: TShAO and Assy optical observations
  56. IPN triangulation of GRB 230815B
  57. GRB 230815A: Swift-XRT refined Analysis
  58. GRB 230812B: CrAO ZTSh optical observations
  59. GRB 230812B: Osservatorio Astronomico "Nastro Verde" optical observation
  60. GRB 230812B: Montarrenti Observatory optical observations
  61. GRB 230812B: Swift-XRT afterglow detection
  62. GRB 230812B: Zwicky Transient Facility Identifies Optical Afterglow Candidate of a Fermi GRB (Trigger 713559497)
  63. LAT GRB230812.79: Global MASTER-Net observations report
  64. Fermi trigger No 713525317: Global MASTER-Net observations report
  65. GRB 230805B : MITSuME Akeno optical upper limits
  66. Fermi trigger No 712991593: Global MASTER-Net observations report
  67. GRB 230805B: Swift-XRT refined Analysis
  68. GRB 230803A: Fermi GBM Final Real-time Localization
  69. GRB 230802A: Swift-XRT refined Analysis
  70. IceCube-230707A: JCMT/SCUBA-2 submm observations
  71. GRB 230723B: MITSuME Ishigaki optical observation
  72. GRB 230728A: Swift-XRT refined Analysis
  73. IceCube-230724A: No counterparts from the Zwicky Transient Facility
  74. Fermi-LAT gamma-ray observations of IceCube-230724A
  75. IceCube-230725A: Upper limits from a search for additional neutrino events in IceCube
  76. IceCube-230724A: Upper limits from a search for additional neutrino events in IceCube
  77. GRB 230723B: Further CAHA observations and host galaxy detection
  78. GRB 230723B: MITSuME Akeno optical afterglow candidate detection
  79. IceCube-230724A - IceCube observation of a high-energy neutrino candidate track-like event
  80. IceCube Alert 230724.08: Global MASTER-Net observations report
  81. Fermi trigger No 711853834: Global MASTER-Net observations report
  82. GRB 230724A: Fermi GBM Final Real-time Localization
  83. Fermi trigger No 711805358: Global MASTER-Net observations report
  84. Swift GRB230720.30: Global MASTER-Net observations report
  85. GRB 230707A: Swift/BAT-GUANO position correction
  86. LIGO/Virgo/KAGRA S230708z: Identification of a GW compact binary merger candidate
  87. LIGO/Virgo/KAGRA S230704f: Updated Sky localization
  88. LIGO/Virgo/KAGRA S230706ah: Identification of a GW compact binary merger candidate
  89. GRB 230628E: Swift-XRT refined Analysis
  90. LIGO/Virgo/KAGRA S230627c: Global MASTER-Net observations report
  91. GRB 230622A: Swift-BAT refined analysis
  92. GRB 230625A: Fermi GBM Final Real-time Localization
  93. ATLAS23msn/ZTF23aaoohpy/AT2023lcr: Zeiss-1000 of Koshka observatory optical observations
  94. LIGO/Virgo/KAGRA S230624av: Identification of a GW compact binary merger candidate
  95. GRB 230623A: MAXI/GSC detection
  96. LIGO/Virgo S230622e: Global MASTER-Net observations report
  97. LIGO/Virgo S230621ad: Global MASTER-Net observations report
  98. Fermi trigger No 709083929: Global MASTER-Net observations report
  99. ZTF23aaoohpy/AT2023lc: Mondy optical observations
  100. GRB 230618A: Osservatorio Astronomico Nastro verde upper limit

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