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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"

45792 results found.

  1. GRB 240605B: Fermi GBM Final Real-time Localization
  2. GRB 240604A: Fermi GBM Final Localization
  3. GRB 240605A: Fermi GBM Final Real-time Localization
  4. GRB 240604A: GECAM detection of a long burst
  5. GRB 240529A: SAO RAS optical observations
  6. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  7. Fermi GRB 240603C: Global MASTER-Net observations report
  8. LIGO/Virgo/KAGRA S240601co: Upper limits from Swift/BAT-GUANO
  9. LIGO/Virgo/KAGRA S240530a: Upper limits from Swift/BAT-GUANO
  10. GRB 240603A: Fermi GBM Final Localization
  11. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  12. GRB 240603C: Fermi GBM Final Real-time Localization
  13. Swift Trigger 1232465: consistent with noise
  14. GRB 240603B: Swift detection of a possible burst
  15. GRB 240529A: MASTER prompt OT detection
  16. GRB 240603A: GECAM detection of a short burst
  17. GRB 240529A: continued SAO RAS optical observations
  18. Fermi GRB 240602A: Global MASTER-Net observations report
  19. GRB 240529A: OSN optical detection
  20. The EP-WXT source triggered on June 1st is likely a flaring star
  21. GRB 240529A: further SAO RAS optical observations
  22. LIGO/Virgo/KAGRA S240601aj: Updated Sky localization
  23. GRB 240602A: Fermi GBM Final Real-time Localization
  24. LIGO/Virgo/KAGRA S240601co: Identification of a GW compact binary merger candidate
  25. Swift Trigger 1232465 is not a GRB
  26. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  27. LIGO/Virgo/KAGRA S240530a: Updated Sky localization
  28. LXT 240528A: GSP optical upper limit
  29. GRB 240529A: 1.3m DFOT Optical observations
  30. LIGO/Virgo/KAGRA S240527en: Updated Sky localization
  31. LIGO/Virgo/KAGRA S240601aj: Identification of a GW compact binary merger candidate
  32. GRB 240531A: AstroSat CZTI detection of a short burst
  33. GRB 240529A : Mondy optical observations
  34. Konus-Wind detection of GRB 240529A
  35. IPN triangulation of the initial episode of GRB 240529A
  36. GRB 240529A: SAO RAS optical observations
  37. LIGO/Virgo/KAGRA S240531bp: Updated Sky localization
  38. LIGO/Virgo/KAGRA S240531bp: Identification of a GW compact binary merger candidate
  39. GRB 240529A: MAAO 0.7m telescope optical afterglow detection
  40. GRB 240529A: Insight-HXMT/HE detection
  41. GRB 240529A: optical photometry from Konkoly
  42. GRB 240529A: GROWTH-India optical follow-up
  43. GRB 240529A: T193/MISTRAL observations
  44. GRB 240529A: Redshift from GTC/OSIRIS+
  45. GRB 240529A: AKO Optical Afterglow Detection
  46. LIGO/Virgo/KAGRA S240530a: Identification of a GW compact binary merger candidate
  47. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  48. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  49. GRB 240529A: J-band detections with WINTER
  50. GRB 240529A: Skynet Optical Observations
  51. LXT 240528A: LEIA detection of a fast X-ray transient
  52. GRB 240529A: Swift-BAT refined analysis
  53. LIGO/Virgo S240527fv: GRANDMA/FRAM-Auger Optical Observations
  54. GRB 240529A: Swift-XRT refined Analysis
  55. GRB240529A: BOOTES-6/DPRT optical detection
  56. GRB 240529A: Swift/UVOT Detection
  57. GRB 240529A: NOT optical observations
  58. GRB 240529A: AstroSat CZTI detection
  59. GRB 240529A: GOTO optical afterglow detection
  60. GRB 240527B: Swift-XRT afterglow detection
  61. GRB 240529A: Enhanced Swift-XRT position
  62. GRB 240529A: Swift detection of a burst with an optical counterpart
  63. Swift GRB240529.12: Global MASTER-Net observations report
  64. LIGO/Virgo/KAGRA S240527fv: Updated Sky localization
  65. GRB 240527B: Fermi GBM Observation
  66. Fermi GRB 240527A: Global MASTER-Net observations report
  67. LIGO/Virgo/KAGRA S240527fv: Identification of a GW compact binary merger candidate
  68. GRB 240527B: Fermi-LAT detection
  69. LAT GRB240527.59: Global MASTER-Net observations report
  70. LIGO/Virgo/KAGRA S240527en: Identification of a GW compact binary merger candidate
  71. Fermi GRB 240527B: Global MASTER-Net observations report
  72. GRB 240527B: Fermi GBM Final Localization
  73. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  74. GRB 240527A: Fermi GBM Final Real-time Localization
  75. GRB 240523A: Swift-BAT refined analysis
  76. Fermi trigger No 738348224: Global MASTER-Net observations report
  77. Fermi trigger No 738330463: Global MASTER-Net observations report
  78. LIGO/Virgo/KAGRA S240525p: Updated Sky localization
  79. LIGO/Virgo/KAGRA S240525p: Identification of a GW compact binary merger candidate
  80. GRB 240523A: Swift-XRT refined Analysis
  81. GRB 240523A: Enhanced Swift-XRT position
  82. GRB 240523A: Swift detection of a burst
  83. GRB 240521B: Fermi GBM Observation
  84. Fermi GBM Sub-Threshold Detection of GRB 240516B
  85. GRB 240513A: Swift-XRT afterglow detection
  86. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  87. Fermi trigger No 737996942: Global MASTER-Net observations report
  88. LIGO/Virgo/KAGRA S240520cv: Updated Sky localization and EM Bright Classification
  89. EP240518a: GSP optical upper limit
  90. GRB 240521A: GECAM-B detection of a long burst
  91. GRB 240516B: AstroSat CZTI detection
  92. LIGO/Virgo/KAGRA S240515m: Upper limits from Swift/BAT-GUANO
  93. LIGO/Virgo/KAGRA S240514x: Upper limits from Swift/BAT-GUANO
  94. LIGO/Virgo/KAGRA S240513ei: Upper limits from Swift/BAT-GUANO
  95. LIGO/Virgo/KAGRA S240520cv: Identification of a GW compact binary merger candidate
  96. IceCube-Cascade 240518A: Upper limits from a search for additional neutrino events in IceCube
  97. GRB 240514B: VZLUSAT-2 detection
  98. GRB 240504A: VZLUSAT-2 detection
  99. GRB 240502A: VZLUSAT-2 detection
  100. GRB 240519A: GRBAlpha detection

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