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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"

45766 results found.

  1. Fermi GRB 241016A: Global MASTER-Net observations report
  2. GRB 241016A: Fermi GBM Final Real-time Localization
  3. IceCube alert 139977_2910365 retraction
  4. IceCube Alert 241016.04: Global MASTER-Net observations report
  5. GRB 241010A: Swift-BAT refined analysis
  6. GRB 241013B: Fermi GBM Observation
  7. GRB 241013B: Swift/BAT-GUANO localization skymap of a burst
  8. GRB 241013A: Fermi GBM Observation
  9. GRB 240916A: radio detection with the VLA
  10. GRB241013A: REM observations
  11. GRB 241009A: LCO optical upper limits
  12. GRB 241013B: SVOM/GRM observation
  13. Fermi GRB 241013B: Global MASTER-Net observations report
  14. Integral GRB241013.04: Global MASTER-Net observations report
  15. GRB 241013B: Fermi GBM Final Real-time Localization
  16. GRB 241013A: a long GRB detected by INTEGRAL
  17. GRB 241013A: Fermi GBM Final Real-time Localization
  18. LIGO/Virgo/KAGRA S241009em: Updated Sky localization
  19. LIGO/Virgo/KAGRA S241011k: Updated Sky localization
  20. LIGO/Virgo/KAGRA S241011k: NED Galaxies in the Localization Volume
  21. LIGO/Virgo/KAGRA S241011k: Identification of a GW compact binary merger candidate
  22. Fermi Gamma-ray Burst Monitor GRB trigger 750372658/241011869 (GRB 241011A) is not a GRB
  23. GRB 241011A: Fermi GBM Final Real-time Localization
  24. GRB 241009A: GRANDMA optical upper limits
  25. GRB 241009A: Swift-XRT afterglow detection
  26. GRB 241010A: JinShan optical observations and potential host galaxy
  27. GRB 241006A: ATCA Radio Upper Limits
  28. GRB 241010A: Swift-XRT refined Analysis
  29. LIGO/Virgo/KAGRA S241007bw: Updated Sky localization
  30. Fermi trigger No 750211959: Global MASTER-Net observations report
  31. Fermi Gamma-ray Burst Monitor trigger 750303285/241011066 is not a GRB
  32. Fermi Gamma-ray Burst Monitor trigger 750291012/241010924 is not a GRB
  33. Swift GRB 241010A: Global MASTER-Net observations report
  34. Fermi trigger No 750291012: Global MASTER-Net observations report
  35. GRB 241010A: J-band observations with WINTER
  36. LIGO/Virgo/KAGRA S241009an: Updated Sky localization
  37. Fermi GRB 241010B: Global MASTER-Net observations report
  38. GRB 241010B: Fermi GBM Final Real-time Localization
  39. IceCube-241006A: Upper limits from a search for additional neutrino events in IceCube
  40. GRB 241010A: Enhanced Swift-XRT position
  41. GRB 241010A: LCO optical observations
  42. GRB 241010A: Swift detection of a burst with an optical counterpart
  43. Fermi-LAT Gamma-ray Observations of IceCube-241006A
  44. GRB 241006A: Swift-BAT refined analysis
  45. GRB 241009A: Swift ToO observations
  46. LIGO/Virgo/KAGRA S241009l: Updated Sky localization
  47. LIGO/Virgo/KAGRA S241009em: Identification of a GW compact binary merger candidate
  48. GRB 241009A : Detection of a long duration GRB by SVOM/ECLAIRs
  49. GRB 241008A: Fermi GBM Observation
  50. GRB 241008A: Fermi-LAT detection
  51. GRB 241002B: Swift-XRT afterglow detection
  52. LIGO/Virgo/KAGRA S241009an: Identification of a GW compact binary merger candidate
  53. GRB 241002A: NOT optical upper limits
  54. LIGO/Virgo/KAGRA S241009l: Identification of a GW compact binary merger candidate
  55. Fermi GRB 241008A: Global MASTER-Net observations report
  56. GRB 241008A: BALROG localization (Fermi Trigger 750117609 / GRB 241008917)
  57. GRB 241008A: Fermi GBM Final Real-time Localization
  58. IceCube-241006A: No candidates from the Zwicky Transient Facility
  59. GRB 241006A: GRANDMA optical upper limits
  60. EP240930a / GRB 240930B: CrAO ZTSH optical upper limit
  61. GRB 241002B: PRIME near-infrared detection in 3rd epoch
  62. Fermi-LAT Gamma-ray Observations of NuEm-240926A
  63. GRB 240910A: LBT optical observations
  64. EP trigger ID 01709065118: KAIT confirmation of the stellar flare
  65. GRB 241006A: Swift-XRT refined Analysis
  66. GRB 240821A: Host galaxy redshift from VLT/X-shooter
  67. GRB 241006A: PRIME near-infrared upper limits
  68. GRB 241006A: Swift/UVOT Upper Limits
  69. GRB 241006A: SVOM/VT follow-up and optical upper limit
  70. LIGO/Virgo/KAGRA S241007bw: Identification of a GW compact binary merger candidate
  71. IceCube Alert 241006.94: Global MASTER-Net observations report
  72. GRB 241001A: Swift-XRT afterglow detection
  73. GRB 241006A: Enhanced Swift-XRT position
  74. IceCube-241006A - IceCube observation of a high-energy neutrino candidate track-like event
  75. GRB 241006A: Swift detection of a burst
  76. Swift GRB241006.91: Global MASTER-Net observations report
  77. GRB 240930B: SVOM/C-GFT optical upper limit
  78. LIGO/Virgo/KAGRA S241006k: Identification of a GW compact binary merger candidate
  79. LIGO/Virgo/KAGRA S241005bo: Retraction of GW compact binary merger candidate
  80. Fermi trigger No 749721670: Global MASTER-Net observations report
  81. GRB 241004A: SVOM/GRM observation
  82. EP trigger ID 01709065118: the X-ray transient is likely a stellar flare event
  83. GRB 240930B / EP 240930a: SVOM/GRM observation
  84. GRB 241001A : ECLAIRs spectral analysis and XRF classification
  85. GRB 241002B: PRIME near-infrared detection in 2nd epoch
  86. GRB 241002B: Fermi GBM Observation
  87. Fermi trigger No 749735279: Global MASTER-Net observations report
  88. Fermi trigger No 749630753: Global MASTER-Net observations report
  89. Fermi trigger No 749693019: Global MASTER-Net observations report
  90. GRB 241002B: Swift-XRT observations
  91. GRB 241002C: SVOM/C-GFT optical upper limit
  92. GRB 241002A: Swift-BAT refined analysis
  93. GRB 241002B: Swift/BAT-GUANO localization skymap of a burst
  94. GRB 241002B: Swift ToO observations
  95. GRB 241002C: Swift-XRT observations confirm the source to be EI Eri
  96. Konus-Wind detection of GRB 240926A
  97. GRB 241002B: PRIME near-infrared detection
  98. LIGO/Virgo/KAGRA S240925n: NED Galaxies in the Localization Volume
  99. GRB 241002C: Swift ToO observations
  100. Fermi-GBM Sub-Threshold Detection of GRB 241002D

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