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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"

32551 results found.

  1. GRB 240615A: Fermi GBM Observation
  2. LIGO/Virgo/KAGRA S240615ea: Updated Sky localization
  3. GRB 240615A: GECAM detection
  4. X-ray transient EP240414a: Chandra late time observation
  5. GRB 240615A: FLWO-1.2m optical upper limits
  6. Fermi GRB 240616A: Global MASTER-Net observations report
  7. Konus-Wind detection of GRB 240615A (short/hard)
  8. GRB 240615A: GOTO optical upper limits
  9. GRB 240615A: Swift ToO observations
  10. GRB 240615A: Swift/BAT-GUANO arcminute localization of a short burst
  11. LIGO/Virgo/KAGRA S240615ea: Identification of a GW compact binary merger candidate
  12. LIGO/Virgo/KAGRA S240615dg: Identification of a GW compact binary merger candidate
  13. GRB 240603A: VZLUSAT-2 detection
  14. GRB 240612A: GRBAlpha detection
  15. Fermi GRB 240612B: Global MASTER-Net observations report
  16. Fermi GRB 240612A: Global MASTER-Net observations report
  17. GRB 240607A: GECAM detection of a bright long burst
  18. Fermi GRB 240611A: Global MASTER-Net observations report
  19. Konus-Wind detection of GRB 240607A
  20. EXO 0748-676: Swift-BAT refined analysis
  21. GRB 240529A: LBT optical detection and late temporal decay
  22. GRB 240529A : MITSuME Akeno optical afterglow detection
  23. Fermi GRB 240610A: Global MASTER-Net observations report
  24. IPN triangulation of GRB 240607A
  25. Fermi GRB 240608A: Global MASTER-Net observations report
  26. Konus-Wind detection of GRB 240606B
  27. Fermi GRB 240607A: Global MASTER-Net observations report
  28. GRB 240529A: NOEMA detection
  29. GRB 240607A: Fermi GBM Observation
  30. GRB 240606B: Fermi GBM Observation
  31. Swift Trigger 1235109: consistent with noise and not astrophysical
  32. GRB 240607A: AstroSat CZTI detection of bright long burst
  33. GRB 240607A: Fermi GBM detection of a very bright burst
  34. GRB 240529A: radio detection with AMI-LA
  35. GRB 240606B: GECAM-B detection a long burst
  36. GRB 240606B: Swift ToO observations
  37. GRB 240606B: Swift/BAT-GUANO arcminute localization of a burst
  38. Konus-Wind detection of GRB 240603A
  39. Fermi GRB 240604A: Global MASTER-Net observations report
  40. IPN triangulation of GRB 240531A (short)
  41. Fermi GRB 240605A: Global MASTER-Net observations report
  42. Fermi GRB 240605C: Global MASTER-Net observations report
  43. LIGO/Virgo/KAGRA S240601co: Updated Sky localization
  44. IPN triangulation of GRB 240603A
  45. GRB 240529A: SAO RAS optical observations
  46. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  47. Fermi GRB 240603C: Global MASTER-Net observations report
  48. Swift Trigger 1232465: consistent with noise
  49. GRB 240529A: MASTER prompt OT detection
  50. GRB 240529A: continued SAO RAS optical observations
  51. Fermi GRB 240602A: Global MASTER-Net observations report
  52. GRB 240529A: further SAO RAS optical observations
  53. LIGO/Virgo/KAGRA S240601aj: Updated Sky localization
  54. LIGO/Virgo/KAGRA S240601co: Identification of a GW compact binary merger candidate
  55. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  56. LIGO/Virgo/KAGRA S240530a: Updated Sky localization
  57. LXT 240528A: GSP optical upper limit
  58. GRB 240529A: 1.3m DFOT Optical observations
  59. LIGO/Virgo/KAGRA S240527en: Updated Sky localization
  60. LIGO/Virgo/KAGRA S240601aj: Identification of a GW compact binary merger candidate
  61. GRB 240529A : Mondy optical observations
  62. Konus-Wind detection of GRB 240529A
  63. IPN triangulation of the initial episode of GRB 240529A
  64. GRB 240529A: SAO RAS optical observations
  65. LIGO/Virgo/KAGRA S240531bp: Updated Sky localization
  66. LIGO/Virgo/KAGRA S240531bp: Identification of a GW compact binary merger candidate
  67. GRB 240529A: MAAO 0.7m telescope optical afterglow detection
  68. GRB 240529A: Insight-HXMT/HE detection
  69. GRB 240529A: optical photometry from Konkoly
  70. GRB 240529A: GROWTH-India optical follow-up
  71. GRB 240529A: T193/MISTRAL observations
  72. GRB 240529A: Redshift from GTC/OSIRIS+
  73. GRB 240529A: AKO Optical Afterglow Detection
  74. LIGO/Virgo/KAGRA S240530a: Identification of a GW compact binary merger candidate
  75. GRB 240529A: J-band detections with WINTER
  76. GRB 240529A: Skynet Optical Observations
  77. GRB 240529A: Swift-BAT refined analysis
  78. LIGO/Virgo S240527fv: GRANDMA/FRAM-Auger Optical Observations
  79. GRB 240529A: Swift/UVOT Detection
  80. GRB 240529A: NOT optical observations
  81. GRB 240529A: AstroSat CZTI detection
  82. GRB 240529A: GOTO optical afterglow detection
  83. LIGO/Virgo/KAGRA S240527fv: Updated Sky localization
  84. GRB 240527B: Fermi GBM Observation
  85. Fermi GRB 240527A: Global MASTER-Net observations report
  86. LIGO/Virgo/KAGRA S240527fv: Identification of a GW compact binary merger candidate
  87. GRB 240527B: Fermi-LAT detection
  88. LIGO/Virgo/KAGRA S240527en: Identification of a GW compact binary merger candidate
  89. Fermi GRB 240527B: Global MASTER-Net observations report
  90. GRB 240523A: Swift-BAT refined analysis
  91. LIGO/Virgo/KAGRA S240525p: Updated Sky localization
  92. LIGO/Virgo/KAGRA S240525p: Identification of a GW compact binary merger candidate
  93. GRB 240521B: Fermi GBM Observation
  94. Fermi GBM Sub-Threshold Detection of GRB 240516B
  95. GRB 240513A: Swift-XRT afterglow detection
  96. LIGO/Virgo/KAGRA S240520cv: Updated Sky localization and EM Bright Classification
  97. EP240518a: GSP optical upper limit
  98. LIGO/Virgo/KAGRA S240520cv: Identification of a GW compact binary merger candidate
  99. GRB 240514B: VZLUSAT-2 detection
  100. GRB 240504A: VZLUSAT-2 detection

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