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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"

32739 results found.

  1. GRB 240603A: VZLUSAT-2 detection
  2. GRB 240612A: GRBAlpha detection
  3. Fermi GRB 240612B: Global MASTER-Net observations report
  4. Fermi GRB 240612A: Global MASTER-Net observations report
  5. GRB 240607A: GECAM detection of a bright long burst
  6. Fermi GRB 240611A: Global MASTER-Net observations report
  7. Konus-Wind detection of GRB 240607A
  8. EXO 0748-676: Swift-BAT refined analysis
  9. GRB 240529A: LBT optical detection and late temporal decay
  10. GRB 240529A : MITSuME Akeno optical afterglow detection
  11. Fermi GRB 240610A: Global MASTER-Net observations report
  12. IPN triangulation of GRB 240607A
  13. Fermi GRB 240608A: Global MASTER-Net observations report
  14. Konus-Wind detection of GRB 240606B
  15. Fermi GRB 240607A: Global MASTER-Net observations report
  16. GRB 240529A: NOEMA detection
  17. GRB 240607A: Fermi GBM Observation
  18. GRB 240606B: Fermi GBM Observation
  19. Swift Trigger 1235109: consistent with noise and not astrophysical
  20. GRB 240607A: AstroSat CZTI detection of bright long burst
  21. GRB 240607A: Fermi GBM detection of a very bright burst
  22. GRB 240529A: radio detection with AMI-LA
  23. GRB 240606B: GECAM-B detection a long burst
  24. GRB 240606B: Swift ToO observations
  25. GRB 240606B: Swift/BAT-GUANO arcminute localization of a burst
  26. Konus-Wind detection of GRB 240603A
  27. Fermi GRB 240604A: Global MASTER-Net observations report
  28. IPN triangulation of GRB 240531A (short)
  29. Fermi GRB 240605A: Global MASTER-Net observations report
  30. Fermi GRB 240605C: Global MASTER-Net observations report
  31. LIGO/Virgo/KAGRA S240601co: Updated Sky localization
  32. IPN triangulation of GRB 240603A
  33. GRB 240529A: SAO RAS optical observations
  34. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  35. Fermi GRB 240603C: Global MASTER-Net observations report
  36. Swift Trigger 1232465: consistent with noise
  37. GRB 240529A: MASTER prompt OT detection
  38. GRB 240529A: continued SAO RAS optical observations
  39. Fermi GRB 240602A: Global MASTER-Net observations report
  40. GRB 240529A: further SAO RAS optical observations
  41. LIGO/Virgo/KAGRA S240601aj: Updated Sky localization
  42. LIGO/Virgo/KAGRA S240601co: Identification of a GW compact binary merger candidate
  43. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  44. LIGO/Virgo/KAGRA S240530a: Updated Sky localization
  45. LXT 240528A: GSP optical upper limit
  46. GRB 240529A: 1.3m DFOT Optical observations
  47. LIGO/Virgo/KAGRA S240527en: Updated Sky localization
  48. LIGO/Virgo/KAGRA S240601aj: Identification of a GW compact binary merger candidate
  49. GRB 240529A : Mondy optical observations
  50. Konus-Wind detection of GRB 240529A
  51. IPN triangulation of the initial episode of GRB 240529A
  52. GRB 240529A: SAO RAS optical observations
  53. LIGO/Virgo/KAGRA S240531bp: Updated Sky localization
  54. LIGO/Virgo/KAGRA S240531bp: Identification of a GW compact binary merger candidate
  55. GRB 240529A: MAAO 0.7m telescope optical afterglow detection
  56. GRB 240529A: Insight-HXMT/HE detection
  57. GRB 240529A: optical photometry from Konkoly
  58. GRB 240529A: GROWTH-India optical follow-up
  59. GRB 240529A: T193/MISTRAL observations
  60. GRB 240529A: Redshift from GTC/OSIRIS+
  61. GRB 240529A: AKO Optical Afterglow Detection
  62. LIGO/Virgo/KAGRA S240530a: Identification of a GW compact binary merger candidate
  63. GRB 240529A: J-band detections with WINTER
  64. GRB 240529A: Skynet Optical Observations
  65. GRB 240529A: Swift-BAT refined analysis
  66. LIGO/Virgo S240527fv: GRANDMA/FRAM-Auger Optical Observations
  67. GRB 240529A: Swift/UVOT Detection
  68. GRB 240529A: NOT optical observations
  69. GRB 240529A: AstroSat CZTI detection
  70. GRB 240529A: GOTO optical afterglow detection
  71. LIGO/Virgo/KAGRA S240527fv: Updated Sky localization
  72. GRB 240527B: Fermi GBM Observation
  73. Fermi GRB 240527A: Global MASTER-Net observations report
  74. LIGO/Virgo/KAGRA S240527fv: Identification of a GW compact binary merger candidate
  75. GRB 240527B: Fermi-LAT detection
  76. LIGO/Virgo/KAGRA S240527en: Identification of a GW compact binary merger candidate
  77. Fermi GRB 240527B: Global MASTER-Net observations report
  78. GRB 240523A: Swift-BAT refined analysis
  79. LIGO/Virgo/KAGRA S240525p: Updated Sky localization
  80. LIGO/Virgo/KAGRA S240525p: Identification of a GW compact binary merger candidate
  81. GRB 240521B: Fermi GBM Observation
  82. Fermi GBM Sub-Threshold Detection of GRB 240516B
  83. GRB 240513A: Swift-XRT afterglow detection
  84. LIGO/Virgo/KAGRA S240520cv: Updated Sky localization and EM Bright Classification
  85. EP240518a: GSP optical upper limit
  86. LIGO/Virgo/KAGRA S240520cv: Identification of a GW compact binary merger candidate
  87. GRB 240514B: VZLUSAT-2 detection
  88. GRB 240504A: VZLUSAT-2 detection
  89. GRB 240502A: VZLUSAT-2 detection
  90. GRB 240519A: GRBAlpha detection
  91. GRB 240516A: Swift/UVOT Upper Limits
  92. GRB 240519A: AstroSat CZTI detection
  93. EP240518a: possibly identified with a flare star by EP-FXT
  94. LIGO/Virgo/KAGRA S240514c: Updated Sky localization
  95. GRB 240516A: Swift-BAT refined analysis
  96. Fermi GRB 240517A: Global MASTER-Net observations report
  97. GRB 240516A ATCA radio observations
  98. IPN triangulation of GRB 240514B (short)
  99. GRB 240513A: Swift ToO observations
  100. Konus-Wind detection of GRB 240513A

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