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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"

41745 results found.

  1. GRB 260516D: SVOM possible detection of a burst
  2. GRB 260516C: Fermi GBM Final Real-time Localization
  3. Konus-Wind detection of GRB 260515A
  4. GRB 260515A: Liverpool Telescope optical detection
  5. GRB 260515A: LCO optical counterpart detection
  6. GRB 260515A: SVOM/COLIBRÍ (FM-GFT) optical observations
  7. GRB 260515A: EP-FXT follow-up observation
  8. EP260514a: refined analysis of the EP-WXT and follow-up EP-FXT observations
  9. EP260514a: NOT optical counterpart confirmation
  10. EP260514a: TRT optical counterpart candidate
  11. EP260514a: SVOM/VT optical candidate
  12. Fermi GRB 260516B: Global MASTER-Net observations report
  13. GRB 260516B: Fermi GBM Final Real-time Localization
  14. GRB 260515A: SVOM/VT optical observations
  15. GRB 260515A: OHP/T193 optical observations
  16. EP260514a: COLIBRÍ optical upper limits
  17. GRB 260516A: Fermi GBM Final Real-time Localization
  18. GRID detection of GRB 260507A
  19. GRB 260515A: GTC/OSIRIS+ spectroscopic redshift z = 0.764
  20. GRB 260515A: LCO optical observations
  21. SVOM GRB 260515A: Global MASTER-Net observations report
  22. GRB 260515A: NOT optical observations.
  23. SVOM GRB 260515A: MASTER OT J151044.43+243321.7 optical counterpart detection
  24. GRB 260515A: SVOM/VT optical candidate from VHF data
  25. GRB 260515A: JinShan optical counterpart candidate
  26. GRB 260515A: SVOM detection of a burst
  27. GRB 260510C: Glowbug gamma-ray detection
  28. IceCube-260504A: No Candidate Transients from the Zwicky Transient Facility
  29. EP260514a: GROWTH-India Telescope optical upper limit
  30. GRB 260511B: NOT optical observations
  31. Konus-Wind detection of GRB 260512A
  32. GRB 260510C: CALET Gamma-Ray Burst Monitor detection
  33. EP260514a: Global MASTER-Net observations report
  34. EP260514a: Einstein Probe detection of a fast X-ray transient
  35. EP260512a: LCO optical upper limits
  36. GRB 260511B: Mephisto multi-band optical followup
  37. Fermi GRB 260514A: Global MASTER-Net observations report
  38. GRB 260512A: AstroSat CZTI detection
  39. The EP-WXT trigger 01709262077 is likely a flaring star
  40. EP260512a: EP-FXT follow-up observation
  41. EP260507a: Xinglong Schmidt optical counterpart detection
  42. GRB 260514A: Fermi GBM Final Real-time Localization
  43. EP260512a: Global MASTER-Net observations report
  44. Fermi GRB 260513A: Global MASTER-Net observations report
  45. Fermi GRB 260512A: Global MASTER-Net observations report
  46. GRB 260511B: further SAO RAS optical observations
  47. GRB 260513A: Fermi GBM Final Real-time Localization
  48. GRB 260509A: SVOM/VT optical observations
  49. Konus-Wind detection of GRB 260511B
  50. The EP-WXT trigger 01709262036 is likely a flaring star
  51. EP260512a: COLIBRÍ optical upper limits
  52. EP260512a: Einstein Probe detection of an X-ray transient
  53. GRB 260511B: further J-band observations by the SYSU 80 cm infrared telescope
  54. GRB 260511B: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
  55. GRB 260512A: NuSTAR detection of prompt emission
  56. GRB 260509A: Infrared J and Hs observations with MDM/MIRAGE
  57. GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE
  58. EP260507a: Infrared J and Hs upper limits with MDM/MIRAGE
  59. GRB 260512A: Fermi GBM Final Real-time Localization
  60. GRB 260511A: Glowbug gamma-ray detection
  61. Konus-Wind detection of GRB 260511A
  62. GRB 260511B: SAO RAS optical observations
  63. GRB 260510D: Glowbug gamma-ray detection of a likely short burst
  64. GRB 260511B: FRAM-ORM optical detection
  65. GRB 260511A: EP-FXT follow-up observation
  66. GRB 260511B: EP-FXT follow-up observation
  67. GRB 260511B: LCO optical counterpart detection
  68. GRB260511B: MAO/AZT-22 optical observations
  69. GRB 260511A: SVOM/VT optical observations
  70. GRB 260511B: LCO optical observations
  71. GRB 260511B: OHP/T193 spectroscopic observations
  72. GRB 260511B: GOTO optical counterpart detection
  73. GRB 260511B: Xinglong 2.16m/BEFOSC redshift confirmation
  74. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) further optical observations
  75. GRB 260510A: AstroSat CZTI detection (Erroneous Submission)
  76. GRB 260511B: SVOM/VT optical observations
  77. GRB 260511B: SVOM/COLIBRÍ (FM-GFT) optical observations
  78. GRB 260510B: EP-FXT follow-up observation
  79. GRB 260511B: OSIRIS+/GTC redshift z=2.006
  80. GRB 260510C: Fermi GBM Observation
  81. GRB 260509A: SAO RAS optical observations
  82. GRB 260511A: REM near-infrared detection
  83. GRB 260511B: GROWTH-India Telescope optical observations
  84. GRB 260511B: AstroSat CZTI detection
  85. GRB 260506B: Glowbug gamma-ray detection
  86. GRB 260506A: Glowbug gamma-ray detection of a short burst
  87. GRB 260511B: J-band observations by the SYSU 80 cm infrared telescope
  88. GRB 260511B: NuSTAR detection of prompt emission
  89. GRB 260511A: NuSTAR detection of prompt emission
  90. GRB 260511B: Fermi GBM Detection
  91. GRB 260511C: Fermi GBM Final Real-time Localization
  92. GRB 260511B: SVOM/VT optical observation with VHF data
  93. GRB 260511B: TRT optical observation
  94. GRB 260510B: SVOM/ECLAIRs refined analysis
  95. GRB 260511B : MITSuME Akeno optical afterglow candidate detection
  96. GRB 260511A: Fermi GBM Detection
  97. GRB 260511B SVOM/C-GFT optical counterpart detection
  98. EP260509a: LCO optical upper limits
  99. GRB 260511A: UTGO H50 optical afterglow observation
  100. GRB 260510C: AstroSat CZTI detection

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