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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"

45723 results found.

  1. GRB240529A: 3.6m TNG NIR detection 8d after the burst
  2. GRB 240529A: LBT optical detection and late temporal decay
  3. GRB 240529A : MITSuME Akeno optical afterglow detection
  4. Trigger 1236151: Swift detection of EXO 0748-676
  5. Fermi GRB 240610A: Global MASTER-Net observations report
  6. GRB 240610A: Fermi GBM Final Real-time Localization
  7. IPN triangulation of GRB 240607A
  8. Fermi Gamma-ray Burst Monitor trigger 739632045/240609556 is not a GRB
  9. Fermi trigger No 739632045: Global MASTER-Net observations report
  10. Fermi GRB 240608A: Global MASTER-Net observations report
  11. Konus-Wind detection of GRB 240606B
  12. Fermi trigger No 739506569: Global MASTER-Net observations report
  13. GRB 240608A: Fermi GBM Final Real-time Localization
  14. Fermi GRB 240607A: Global MASTER-Net observations report
  15. GRB 240529A: NOEMA detection
  16. GRB 240607A: Fermi GBM Observation
  17. GRB 240606B: Fermi GBM Observation
  18. Swift Trigger 1235109: consistent with noise and not astrophysical
  19. GRB 240607A: AstroSat CZTI detection of bright long burst
  20. GRB 240607A: Fermi GBM detection of a very bright burst
  21. GRB 240529A: radio detection with AMI-LA
  22. GRB 240607A: BALROG localization (Fermi Trigger 739450879 / GRB 240607459)
  23. GRB 240607A: Fermi GBM Final Real-time Localization
  24. GRB 240606B: GECAM-B detection a long burst
  25. Fermi trigger No 739373591: Global MASTER-Net observations report
  26. GRB 240606B: Swift-XRT afterglow detection
  27. Swift GRB240606.15: Global MASTER-Net observations report
  28. GRB 240606B: Swift ToO observations
  29. GRB 240606B: Swift/BAT-GUANO arcminute localization of a burst
  30. Konus-Wind detection of GRB 240603A
  31. Swift Trigger 1235109: a possible GRB 240606A
  32. Fermi GRB 240604A: Global MASTER-Net observations report
  33. IPN triangulation of GRB 240531A (short)
  34. Fermi GRB 240605A: Global MASTER-Net observations report
  35. Fermi GRB 240605C: Global MASTER-Net observations report
  36. Fermi Gamma-ray Burst Monitor trigger 739290883/240605607 is not a GRB
  37. LIGO/Virgo/KAGRA S240601co: Updated Sky localization
  38. GRB 240605C: Fermi GBM Final Real-time Localization
  39. IPN triangulation of GRB 240603A
  40. GRB 240605B: Fermi GBM Final Real-time Localization
  41. GRB 240604A: Fermi GBM Final Localization
  42. GRB 240605A: Fermi GBM Final Real-time Localization
  43. GRB 240604A: GECAM detection of a long burst
  44. GRB 240529A: SAO RAS optical observations
  45. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  46. Fermi GRB 240603C: Global MASTER-Net observations report
  47. LIGO/Virgo/KAGRA S240601co: Upper limits from Swift/BAT-GUANO
  48. LIGO/Virgo/KAGRA S240530a: Upper limits from Swift/BAT-GUANO
  49. GRB 240603A: Fermi GBM Final Localization
  50. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  51. GRB 240603C: Fermi GBM Final Real-time Localization
  52. Swift Trigger 1232465: consistent with noise
  53. GRB 240603B: Swift detection of a possible burst
  54. GRB 240529A: MASTER prompt OT detection
  55. GRB 240603A: GECAM detection of a short burst
  56. GRB 240529A: continued SAO RAS optical observations
  57. Fermi GRB 240602A: Global MASTER-Net observations report
  58. GRB 240529A: OSN optical detection
  59. The EP-WXT source triggered on June 1st is likely a flaring star
  60. GRB 240529A: further SAO RAS optical observations
  61. LIGO/Virgo/KAGRA S240601aj: Updated Sky localization
  62. GRB 240602A: Fermi GBM Final Real-time Localization
  63. LIGO/Virgo/KAGRA S240601co: Identification of a GW compact binary merger candidate
  64. Swift Trigger 1232465 is not a GRB
  65. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  66. LIGO/Virgo/KAGRA S240530a: Updated Sky localization
  67. LXT 240528A: GSP optical upper limit
  68. GRB 240529A: 1.3m DFOT Optical observations
  69. LIGO/Virgo/KAGRA S240527en: Updated Sky localization
  70. LIGO/Virgo/KAGRA S240601aj: Identification of a GW compact binary merger candidate
  71. GRB 240531A: AstroSat CZTI detection of a short burst
  72. GRB 240529A : Mondy optical observations
  73. Konus-Wind detection of GRB 240529A
  74. IPN triangulation of the initial episode of GRB 240529A
  75. GRB 240529A: SAO RAS optical observations
  76. LIGO/Virgo/KAGRA S240531bp: Updated Sky localization
  77. LIGO/Virgo/KAGRA S240531bp: Identification of a GW compact binary merger candidate
  78. GRB 240529A: MAAO 0.7m telescope optical afterglow detection
  79. GRB 240529A: Insight-HXMT/HE detection
  80. GRB 240529A: optical photometry from Konkoly
  81. GRB 240529A: GROWTH-India optical follow-up
  82. GRB 240529A: T193/MISTRAL observations
  83. GRB 240529A: Redshift from GTC/OSIRIS+
  84. GRB 240529A: AKO Optical Afterglow Detection
  85. LIGO/Virgo/KAGRA S240530a: Identification of a GW compact binary merger candidate
  86. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  87. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  88. GRB 240529A: J-band detections with WINTER
  89. GRB 240529A: Skynet Optical Observations
  90. LXT 240528A: LEIA detection of a fast X-ray transient
  91. GRB 240529A: Swift-BAT refined analysis
  92. LIGO/Virgo S240527fv: GRANDMA/FRAM-Auger Optical Observations
  93. GRB 240529A: Swift-XRT refined Analysis
  94. GRB240529A: BOOTES-6/DPRT optical detection
  95. GRB 240529A: Swift/UVOT Detection
  96. GRB 240529A: NOT optical observations
  97. GRB 240529A: AstroSat CZTI detection
  98. GRB 240529A: GOTO optical afterglow detection
  99. GRB 240527B: Swift-XRT afterglow detection
  100. GRB 240529A: Enhanced Swift-XRT position

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