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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"

45498 results found.

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

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