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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"

37717 results found.

  1. GRB 261026A: SVOM/ECLAIRs refined analysis
  2. GRB 261024C: GECAM-B observation
  3. GRB 261026B: AstroSat CZTI detection
  4. GRB 261024D: Insight-HXMT/HE detection
  5. GRB261026A: Infrared detection with MDM/MIRAGE
  6. GRB 261026A: SVOM/VT optical blue bump
  7. GRB 261026A: SAO RAS optical observations
  8. GRB 261024D: GECAM-B observation
  9. GRB 261026A: EP-FXT follow-up observation
  10. GRB 261024A: SVOM/GRM observation
  11. GRB 261026A: Upper Limit with 60cm Panzhihua Telescope
  12. GRB 261026A: OHP/T120 optical imaging
  13. GRB 261024D: Glowbug gamma-ray detection
  14. GRB 261026B: NuSTAR detection of prompt emission
  15. GRB 261024D: NuSTAR detection of prompt emission
  16. GRB 261024C: NuSTAR detection of prompt emission
  17. GRB 261026A: Ondrejov D50 optical limit
  18. GRB 261026A: ULL-ASTRO-MASTER optical detection with LCO 40-cm telescope at Haleakalā Observatory
  19. GRB 261026A: J-band observations by the SYSU 80cm infrared telescope
  20. GRB 261026A: SVOM/VT optical observations
  21. IPN triangulation of GRB 260730B
  22. GRB 261026C: Fermi GBM Final Real-time Localization
  23. GRB 261020A: Insight-HXMT/HE detection
  24. GRB 261026A: WINTER J-band observations
  25. GRB 261024D: AstroSat CZTI detection of a long burst
  26. GRB 261024C: AstroSat CZTI detection of a long burst
  27. GRB 261019A: GECAM-B observation
  28. GRB 261019A: SVOM/GRM observation
  29. Fermi GRB 261026B: Global MASTER-Net observations report
  30. GRB 261026A: SVOM/VT optical observation from VHF data
  31. GRB 261026A: KAIT optical observations
  32. GRB 261026A: SVOM/COLIBRÍ (FM-GFT) optical observations
  33. GRB 261026B: Fermi GBM Final Real-time Localization
  34. GRB 261024A: NuSTAR detection of prompt emission
  35. GRB 261026A: SVOM detection of a burst
  36. GRB 261025B: Fermi GBM Final Real-time Localization
  37. GRB 261025A: Fermi GBM Final Localization Correction
  38. GRB 261024B: Fermi GBM Final Real-time Localization
  39. GRB 261024A: BALROG localization (Fermi Trigger 814551785 / GRB 261024683)
  40. GRB 261024A: Fermi GBM Final Real-time Localization
  41. EP261023a: Mondy optical upper limit
  42. EP261015a: VLA non-detection
  43. GRB 261019A: Insight-HXMT/HE detection
  44. GRB 261017A: SVOM/GRM observation
  45. GRB 261021A: Fermi GBM Final Real-time Localization
  46. GRB 261020B: AstroSat CZTI detection of a short burst
  47. Fermi-LAT Gamma-ray Observations of IceCube-261020A
  48. EP261015a: AZT-20 Assy-Turgen optical observations
  49. GRB 261020A: Fermi GBM Observation
  50. GRB 261017A: SAO RAS optical upper limit
  51. GRB 260903A
  52. EP261015a: Terskol Zeiss-2000 optical upper limit
  53. GRB 261017A: COLIBRÍ optical upper limit
  54. IceCube-261020A - IceCube observation of a high-energy neutrino candidate track-like event
  55. GRB 261020A: MAXI GSC detection
  56. GRB 261020A: Fermi GBM Final Real-time Localization
  57. Konus-Wind detection of GRB 261017A
  58. GRB 261019A: Fermi GBM Final Localization
  59. GRB 261017A: Possible Swift/UVOT Detection
  60. GRB 261017A: Luminance-band upper limit from a 28cm telescope in Chengde
  61. GRB 261017A: R-band upper limit with the 1.3-m DFOT
  62. GRB 261017A: Swift-BAT refined analysis
  63. GRB 261017A: a short minimum variability timescale compatible with a compact object merger origin
  64. GRB 261017A: J band upper limit by the SYSU 80cm infrared telescope
  65. GRB 261017A : MITSuME Akeno optical upper limits
  66. GRB 261017A: Swift-XRT refined Analysis
  67. GRB 261017A: Nanshan/NEXT optical upper limit
  68. GRB 261017A: Enhanced Swift-XRT position
  69. GRB 261017A: Fermi GBM Observation
  70. GRB261010A: Retraction of Keck/MOSFIRE near-IR source
  71. GRB 261017A: Swift detection of a burst
  72. GRB 261017A: Fermi GBM Final Real-time Localization
  73. GRB 261011A: 1.3m DFOT optical upper limit
  74. GRB 261010A: Pan-STARRS z-band imaging and upper limit
  75. GRB 261010A: VLA radio observations
  76. GRB261010A: Keck/MOSFIRE detection of a near-IR source
  77. GRB 261010A: ASKAP non-detection of a radio afterglow
  78. GRB 261010A: LBT tentative near-infrared detection
  79. GRB 261011A: SAO RAS and AbAO optical observations
  80. GRB 261010A: Glowbug gamma-ray detection
  81. GRB 261008A: SVOM/GRM observation
  82. GRB 261009A: GECAM-B detection of a burst
  83. GRB 261010A: initial pulse rest-frame energetics from Konus-Wind detection
  84. GRB 261010A: a short minimum variability timescale and a distinct pulse evolution compatible with a merger origin
  85. GRB 261013A: Fermi GBM Final Real-time Localization
  86. GRB 261011A: Later-epoch J-band upper limit from the SYSU 80 cm infrared telescope
  87. Fermi-LAT Gamma-ray Observations of IceCube-261012A
  88. GRID detection of GRB 261010A
  89. GRB 261011A: GECAM-B observation
  90. GRB 261011B: GECAM-B observation
  91. GRB 261010A: J-band upper limit by the SYSU 80cm infrared telescope
  92. GRB 261010A: Swift-XRT refined Analysis
  93. GRB 261011A: Swift-XRT refined Analysis
  94. GRB 261011A: Enhanced Swift-XRT position
  95. GRB 261010A: a Type I-L (merger-driven) GRB candidate
  96. GRB 261011A: 10.4m GTC spectroscopic redshift (z = 2.407)
  97. GRB 261011A: Swift-BAT refined analysis
  98. IceCube-261012A - IceCube observation of a high-energy neutrino candidate track-like event
  99. GRB 261010A: 10.4m GTC spectroscopy of the galaxy 2" from the afterglow
  100. GRB 261011A: REM optical/NIR observations

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