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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"

23715 results found.

  1. IPN triangulation of GRB 240810A (short)
  2. GRB 240811A: Swift-BAT refined analysis
  3. GRB 240809A: Swift-BAT refined analysis
  4. GRB 240811A: Bassano Bresciano Observatory upper limit
  5. GRB 240811A: Swift/UVOT Upper Limits
  6. EP240801a: Assy-Turgen optical observations
  7. Fermi GRB 240810A: Global MASTER-Net observations report
  8. Konus-Wind detection of GRB 240809A
  9. Fermi trigger No 745057312: Global MASTER-Net observations report
  10. Swift GRB 240811A: Global MASTER-Net observations report
  11. Konus-Wind detection of GRB 240807A (a counterpart of EP240807a)
  12. GRB 240809A: Conclusive redshift from VLT
  13. GRB 240809A: KAIT optical observations
  14. GRB 240809B: MAXI/GSC detection
  15. GRB 240809A: Tentative redshift from NOT
  16. IPN triangulation of GRB 240807A / EP 240807a
  17. Swift GRB 240809A: Global MASTER-Net observations report
  18. GRB 240807A: SVOM/GRM observation
  19. EP240807a: STEP/T80S optical limits
  20. IceCube Alert 240808.27: Global MASTER-Net observations report
  21. EP EP240807a: Global MASTER-Net observations report
  22. EP EP240806a: Global MASTER-Net observations report
  23. GRB 240801A: GRBAlpha detection
  24. GRB 240710B: VZLUSAT-2 detection
  25. Fermi trigger No 744761058: Global MASTER-Net observations report
  26. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  27. EP-WXT trigger 01709018832: KAIT optical observations of the star flare
  28. EP240802a/GRB240802A: KAIT optical upper limit
  29. GRB 240720B: VZLUSAT-2 detection
  30. GRB 240710A: VZLUSAT-2 detection
  31. The EP-WXT trigger 01709018832 on August 7th is likely a flaring star
  32. EP240807a: EP-WXT detection of a fast X-ray transient
  33. EP240806a: Gemini North-GMOS spectroscopic redshift of z = 2.818
  34. GRB 240805B: GIT optical upper limit
  35. EP240806a: KAIT optical observations
  36. GRB 240805B: Swift-BAT refined analysis
  37. GRB 240805A: Swift-BAT refined analysis
  38. Fermi trigger No 744629911: Global MASTER-Net observations report
  39. EP240806a: LCOGT optical counterpart detection
  40. Konus-Wind detection of GRB 240802A (EP240802a)
  41. Konus-Wind detection of GRB 240805A
  42. GRB 240805B Bassano Bresciano Observatory upper limit
  43. GRB240805A: Fermi GBM Observation
  44. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)
  45. Fermi Gamma-ray Burst Monitor trigger 240806402/744629911 is not a GRB
  46. EP240806a: EP-FXT detection of the X-ray emission
  47. GRB 240626B: VZLUSAT-2 detection
  48. GRB 240624B: VZLUSAT-2 detection
  49. GRB 240619C: VZLUSAT-2 detection
  50. EP 240806A: LCO optical observations
  51. EP240806a: GSP optical counterpart detection
  52. EP240806a: EP-WXT detection of a fast X-ray transient
  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. Swift GRB 240805B: Global MASTER-Net observations report
  61. EP240801a: BTA BVRI photometry
  62. Fermi GRB 240805A: Global MASTER-Net observations report
  63. Swift GRB 240805A: Global MASTER-Net observations report
  64. Fermi Gamma-ray Burst Monitor trigger 744558410/240805574 is not a GRB
  65. GRB 240805A: Swift-XRT refined Analysis
  66. EP240804a: GSP detects optical candidate counterpart
  67. GRB 240805B: Swift detection of a burst
  68. GRB 240805A: INTEGRAL spectral analysis
  69. EP240801a: Continued optical observations at ZTSh (CraO)
  70. EP240804a: LCOGT optical counterpart detection
  71. EP240804a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  72. GRB 240805A: Swift detection of a burst
  73. Fermi GRB 240804A: Global MASTER-Net observations report
  74. EP240802a: Montarrenti Observatory optical upper limit
  75. Fermi trigger No 744459130: Global MASTER-Net observations report
  76. EP240802a: Time coincidence with GRB 240802A and optical upper limits with Kinder observations
  77. Fermi trigger No 744278264: Global MASTER-Net observations report
  78. EP240802a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  79. EP240801a: optical observations at CrAO and AbAO
  80. EP240801a: GRANDMA and Kilonova-Catcher optical observations
  81. EP240801a: GTC spectroscopy and absorption redshift
  82. EP240801a: NOT optical observations
  83. GRB 240730A: Swift-BAT refined analysis
  84. EP240801a: GSP follow-up observations of the candidate counterpart
  85. Fermi trigger No 744204856: Global MASTER-Net observations report
  86. EP240801a: Kinder follow-up observations of the candidate counterpart
  87. EP240801a: KAIT optical counterpart observations
  88. EP240801a: GMG observation
  89. EP240801a: TRT optical counterpart detection
  90. EP240801a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  91. GRB 240801B: AstroSat CZTI detection of a bright long burst
  92. Fermi GRB 240801A: Global MASTER-Net observations report
  93. Fermi trigger No 744128417: Global MASTER-Net observations report
  94. Fermi trigger No 744083370: Global MASTER-Net observations report
  95. GRB 240730A: Osservatorio Astronomico Nastro Verde upper limit
  96. GRB240730A: BOOTES-5/JGT early optical upper limit
  97. Fermi GRB 240730B: Global MASTER-Net observations report
  98. Swift GRB 240730A: Global MASTER-Net observations report
  99. GRB 240730A: Swift-XRT refined Analysis
  100. GRB 240730A: KAIT Optical Upper Limit

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