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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

31727 results found.

  1. Fermi GRB 240608A: Global MASTER-Net observations report
  2. Konus-Wind detection of GRB 240606B
  3. Fermi GRB 240607A: Global MASTER-Net observations report
  4. GRB 240529A: NOEMA detection
  5. GRB 240607A: Fermi GBM Observation
  6. GRB 240606B: Fermi GBM Observation
  7. Swift Trigger 1235109: consistent with noise and not astrophysical
  8. GRB 240607A: AstroSat CZTI detection of bright long burst
  9. GRB 240607A: Fermi GBM detection of a very bright burst
  10. GRB 240529A: radio detection with AMI-LA
  11. GRB 240606B: GECAM-B detection a long burst
  12. GRB 240606B: Swift ToO observations
  13. GRB 240606B: Swift/BAT-GUANO arcminute localization of a burst
  14. Konus-Wind detection of GRB 240603A
  15. Fermi GRB 240604A: Global MASTER-Net observations report
  16. IPN triangulation of GRB 240531A (short)
  17. Fermi GRB 240605A: Global MASTER-Net observations report
  18. Fermi GRB 240605C: Global MASTER-Net observations report
  19. LIGO/Virgo/KAGRA S240601co: Updated Sky localization
  20. IPN triangulation of GRB 240603A
  21. GRB 240529A: SAO RAS optical observations
  22. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  23. Fermi GRB 240603C: Global MASTER-Net observations report
  24. Swift Trigger 1232465: consistent with noise
  25. GRB 240529A: MASTER prompt OT detection
  26. GRB 240529A: continued SAO RAS optical observations
  27. Fermi GRB 240602A: Global MASTER-Net observations report
  28. GRB 240529A: further SAO RAS optical observations
  29. LIGO/Virgo/KAGRA S240601aj: Updated Sky localization
  30. LIGO/Virgo/KAGRA S240601co: Identification of a GW compact binary merger candidate
  31. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  32. LIGO/Virgo/KAGRA S240530a: Updated Sky localization
  33. LXT 240528A: GSP optical upper limit
  34. GRB 240529A: 1.3m DFOT Optical observations
  35. LIGO/Virgo/KAGRA S240527en: Updated Sky localization
  36. LIGO/Virgo/KAGRA S240601aj: Identification of a GW compact binary merger candidate
  37. GRB 240529A : Mondy optical observations
  38. Konus-Wind detection of GRB 240529A
  39. IPN triangulation of the initial episode of GRB 240529A
  40. GRB 240529A: SAO RAS optical observations
  41. LIGO/Virgo/KAGRA S240531bp: Updated Sky localization
  42. LIGO/Virgo/KAGRA S240531bp: Identification of a GW compact binary merger candidate
  43. GRB 240529A: MAAO 0.7m telescope optical afterglow detection
  44. GRB 240529A: Insight-HXMT/HE detection
  45. GRB 240529A: optical photometry from Konkoly
  46. GRB 240529A: GROWTH-India optical follow-up
  47. GRB 240529A: T193/MISTRAL observations
  48. GRB 240529A: Redshift from GTC/OSIRIS+
  49. GRB 240529A: AKO Optical Afterglow Detection
  50. LIGO/Virgo/KAGRA S240530a: Identification of a GW compact binary merger candidate
  51. GRB 240529A: J-band detections with WINTER
  52. GRB 240529A: Skynet Optical Observations
  53. GRB 240529A: Swift-BAT refined analysis
  54. LIGO/Virgo S240527fv: GRANDMA/FRAM-Auger Optical Observations
  55. GRB 240529A: Swift/UVOT Detection
  56. GRB 240529A: NOT optical observations
  57. GRB 240529A: AstroSat CZTI detection
  58. GRB 240529A: GOTO optical afterglow detection
  59. LIGO/Virgo/KAGRA S240527fv: Updated Sky localization
  60. GRB 240527B: Fermi GBM Observation
  61. Fermi GRB 240527A: Global MASTER-Net observations report
  62. LIGO/Virgo/KAGRA S240527fv: Identification of a GW compact binary merger candidate
  63. GRB 240527B: Fermi-LAT detection
  64. LIGO/Virgo/KAGRA S240527en: Identification of a GW compact binary merger candidate
  65. Fermi GRB 240527B: Global MASTER-Net observations report
  66. GRB 240523A: Swift-BAT refined analysis
  67. LIGO/Virgo/KAGRA S240525p: Updated Sky localization
  68. LIGO/Virgo/KAGRA S240525p: Identification of a GW compact binary merger candidate
  69. GRB 240521B: Fermi GBM Observation
  70. Fermi GBM Sub-Threshold Detection of GRB 240516B
  71. GRB 240513A: Swift-XRT afterglow detection
  72. LIGO/Virgo/KAGRA S240520cv: Updated Sky localization and EM Bright Classification
  73. EP240518a: GSP optical upper limit
  74. LIGO/Virgo/KAGRA S240520cv: Identification of a GW compact binary merger candidate
  75. GRB 240514B: VZLUSAT-2 detection
  76. GRB 240504A: VZLUSAT-2 detection
  77. GRB 240502A: VZLUSAT-2 detection
  78. GRB 240519A: GRBAlpha detection
  79. GRB 240516A: Swift/UVOT Upper Limits
  80. GRB 240519A: AstroSat CZTI detection
  81. EP240518a: possibly identified with a flare star by EP-FXT
  82. LIGO/Virgo/KAGRA S240514c: Updated Sky localization
  83. GRB 240516A: Swift-BAT refined analysis
  84. Fermi GRB 240517A: Global MASTER-Net observations report
  85. GRB 240516A ATCA radio observations
  86. IPN triangulation of GRB 240514B (short)
  87. GRB 240513A: Swift ToO observations
  88. Konus-Wind detection of GRB 240513A
  89. GRB 240516A: AstroSat CZTI detection
  90. GRB 240516A: Swift-XRT refined Analysis
  91. GRB 240514E: A possible candidate BD-21 1074
  92. GRB 240516A: Fermi GBM Observation
  93. GRB 240511A: Observations from GTC/OSIRIS+
  94. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  95. GRB 240516A: GOTO optical upper limit
  96. GRB 240514B: AT2024ixa/GOTO24bph is not consistent with the Fermi localisation
  97. GRB 240511A: radio detection of afterglow candidate
  98. GRB 240514B: GOTO candidate optical counterpart
  99. Fermi Gamma-ray Burst Monitor list of triggers that are not a GRB
  100. GRB 240514B: GRBAlpha detection

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