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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"

45679 results found.

  1. GRB 240809A: SVOM/GRM observation
  2. GRB 240808A: SVOM/GRM observation
  3. GRB 240807A: SVOM/GRM observation
  4. GRB 240809A: Swift detection of a burst with a bright optical counterpart
  5. EP-WXT trigger 01709018832: SVOM/C-GFT observations of the star flare
  6. EP240807a: STEP/T80S optical limits
  7. GRB 240807B: AstroSat CZTI detection of a short burst
  8. IceCube Alert 240808.27: Global MASTER-Net observations report
  9. EP EP240807a: Global MASTER-Net observations report
  10. EP EP240806a: Global MASTER-Net observations report
  11. IceCube-240808A - IceCube observation of a high-energy neutrino candidate track-like event
  12. GRB 240801A: GRBAlpha detection
  13. GRB 240807B: Fermi GBM Final Localization
  14. GRB 240710B: VZLUSAT-2 detection
  15. GRB 240805A: ATCA Radio Upper Limits
  16. Fermi trigger No 744761058: Global MASTER-Net observations report
  17. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  18. S240807h: Identification of a GW compact binary merger candidate
  19. EP-WXT trigger 01709018832: KAIT optical observations of the star flare
  20. EP240802a/GRB240802A: KAIT optical upper limit
  21. GRB 240720B: VZLUSAT-2 detection
  22. GRB 240710A: VZLUSAT-2 detection
  23. EP240806A: Liverpool Telescope optical follow-up observations
  24. The EP-WXT trigger 01709018832 on August 7th is likely a flaring star
  25. GRB 240807A: Fermi GBM Final Localization
  26. EP240807a: EP-WXT detection of a fast X-ray transient
  27. EP240806a: Gemini North-GMOS spectroscopic redshift of z = 2.818
  28. GRB 240805B: GIT optical upper limit
  29. EP240806a: KAIT optical observations
  30. GRB 240805B: Swift-BAT refined analysis
  31. GRB 240805A: Swift-BAT refined analysis
  32. Fermi trigger No 744629911: Global MASTER-Net observations report
  33. EP240804a (GRB 240804B): NOT optical observations
  34. EP240806a: LCOGT optical counterpart detection
  35. Konus-Wind detection of GRB 240802A (EP240802a)
  36. Improved IPN triangulation of GRB 240802A / EP 240802a
  37. Konus-Wind detection of GRB 240805A
  38. GRB 240805B Bassano Bresciano Observatory upper limit
  39. GRB240805A: Fermi GBM Observation
  40. GRB 240805B: JinShan optical afterglow detection
  41. GRB 240804B/EP240804a: Correction to the GRB name in GCN 37071
  42. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  43. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)
  44. Fermi Gamma-ray Burst Monitor trigger 240806402/744629911 is not a GRB
  45. EP240806a: EP-FXT detection of the X-ray emission
  46. GRB 240626B: VZLUSAT-2 detection
  47. GRB 240624B: VZLUSAT-2 detection
  48. GRB 240619C: VZLUSAT-2 detection
  49. EP 240806A: LCO optical observations
  50. EP240806a: GSP optical counterpart detection
  51. EP240806a: EP-WXT detection of a fast X-ray transient
  52. GRB 240805B: Optical detection with 1.6m Mephisto
  53. EP240804a: BOOTES-6/DPRT optical detection
  54. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  55. GRB 240805B: Swift-XRT refined Analysis
  56. Fermi trigger No 744544656: Global MASTER-Net observations report
  57. GRB 240805B: Swift/UVOT Upper Limits
  58. GRB 240805A: Swift/UVOT Upper Limits
  59. GRB 240805B: BTA optical afterglow candidate
  60. GRB 240805A: SVOM/GRM observation
  61. GRB 240805B: Enhanced Swift-XRT position
  62. GRB 240805B: LCOGT Optical Upper Limits
  63. Swift GRB 240805B: Global MASTER-Net observations report
  64. GRB 240805B: JinShan optical upper limits
  65. EP240801a: BTA BVRI photometry
  66. Fermi GRB 240805A: Global MASTER-Net observations report
  67. Swift GRB 240805A: Global MASTER-Net observations report
  68. Fermi Gamma-ray Burst Monitor trigger 744558410/240805574 is not a GRB
  69. GRB 240805A: Swift-XRT refined Analysis
  70. EP240804a: GSP detects optical candidate counterpart
  71. GRB 240805B: Swift detection of a burst
  72. GRB 240805A: Fermi-LAT detection
  73. GRB 240805A: INTEGRAL spectral analysis
  74. EP240801a: Continued optical observations at ZTSh (CraO)
  75. EP240804a: VLT/X-shooter spectroscopic redshift
  76. EP240804a: LCOGT optical counterpart detection
  77. GRB 240805A: A long GRB detected by INTEGRAL
  78. EP-WXT trigger 00109017646 is not a real source
  79. EP240804a: NOT optical counterpart detection
  80. EP240804a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  81. EP240802a: correction of EP-WXT trigger time in GCN 37019
  82. GRB 240805A: Swift detection of a burst
  83. GRB 240805A: Fermi GBM Final Real-time Localization
  84. Fermi GRB 240804A: Global MASTER-Net observations report
  85. EP240802a: Montarrenti Observatory optical upper limit
  86. GRB 240804A: Fermi GBM Final Real-time Localization
  87. Fermi trigger No 744459130: Global MASTER-Net observations report
  88. IPN triangulation of GRB 240802A / EP 240802a
  89. Fermi Gamma-ray Burst Monitor trigger 744459130/240804425 is not a GRB
  90. EP240801a: Osservatorio Astronomico Nastro Verde upper limit
  91. EP240802A: Bassano Bresciano Observatory upper limit
  92. GRB 240802A: SVOM/GRM observation
  93. EP240802a: Time coincidence with GRB 240802A and optical upper limits with Kinder observations
  94. Fermi trigger No 744278264: Global MASTER-Net observations report
  95. EP240802a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  96. GRB 240802A: AstroSat CZTI detection of a long burst
  97. EP240801a: further SAO RAS optical observations
  98. EP240801a: optical observations at CrAO and AbAO
  99. EP240801a: GRANDMA and Kilonova-Catcher optical observations
  100. EP240801a: Leavitt Observatory optical observations

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