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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

2678 results found.

  1. AXP 4U 1042+61: Mondy optical observations
  2. INTEGRAL Weak trigger #6433: GRT Optical Observation
  3. GRB 120106A: Swift detection of a burst
  4. GRB 120102A: Swift-BAT refined analysis
  5. GRB 120102A: Swift/UVOT Detection
  6. GRB 120102A: Enhanced Swift-XRT position
  7. GRB 120102A: Swift detection of a burst with an optical counterpart
  8. GRB 111229A: Swift/UVOT Detection
  9. GRB 111229A: Enhanced Swift-XRT position
  10. GRB 111229A: GROND afterglow candidate
  11. GRB 111229A: Swift detection of a burst
  12. GRB 111228A, Swift-BAT refined analysis
  13. GRB 111103B: optical upper limit
  14. GRB 111209A: IRTF NIR Imaging/Spectroscopy
  15. GRB 111129A: Swift/UVOT Detection
  16. GRB 111129A: Enhanced Swift-XRT position
  17. GRB 111129A: Swift detection of a burst with an optical counterpart
  18. GRB 111126A found in ground analysis of BAT data
  19. GRB 111107A: Swift-XRT refined Analysis
  20. GRB 111103B: optical observations
  21. GRB 111024A: MAXI/GSC detection of a burst
  22. EVLA 22 GHz Detection of GRB 111008A
  23. GRB 111008A: Gemini spectroscopic redshift
  24. GRB 111008A, GROND observations
  25. GRB 111008A: Gemini optical counterpart
  26. GRB 111008A: Enhanced Swift-XRT position
  27. GRB 111008A, Swift-BAT refined analysis,
  28. GRB 111008A: Swift detection of a burst
  29. GRB 111005A: Swift-BAT refined analysis
  30. MAXI/GSC detection of a short soft X-ray transient
  31. GRB 110915A, Swift-BAT refined analysis
  32. GRB 110915A: Swift detection of a burst
  33. GRB 110731A: SAO RAS and Terskol observations
  34. IPN triangulation of GRB110825A (very intense, long-duration)
  35. GRB 110808A: Swift detection of a burst with optical counterpart
  36. GRB 110801A: Swift detection of a burst with an optical counterpart
  37. GRB110731A: Swift/UVOT Observations
  38. GRB 110731A: Swift detection of a burst with an optical counterpart
  39. IPN triangulation of GRB 110721A
  40. Konus-Wind observation of GRB 110709A
  41. Konus-Wind observation of GRB 110709B
  42. GRB110709A: upper limits from CAHA 1.23m and OSN 1.5m
  43. Swift-BAT trigger 456532 is not astrophysical
  44. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  45. IPN triangulation of GRB110618A (long duration, extremely intense)
  46. Fermi Gamma-ray Burst Monitor trigger 110621949 is not a GRB
  47. GRB 110604A: Suzaku WAM observation of the prompt emission
  48. GRB 110530A: MASTER OT observations
  49. GRB 110530A: MITSuME Akeno Optical Observation
  50. GRB 110422A: MASTER first 30 min OT light curve
  51. GRB 110422A: MASTER earlier OT polarization observations
  52. GRB 110420B: Fermi GBM observation
  53. GRB 110420B: Swift detection of a short hard burst
  54. GRB110414A: MITSuME Okayama Optical upper limits
  55. GRB 110414A: Swift detection of a burst
  56. GRB 110411A: MASTER prompt and follow-up optical limits
  57. GRB 110411A : Xinglong TNT OT candidate
  58. GRB 110411A, Swift-BAT refined analysis
  59. GRB 110411A: Enhanced Swift-XRT position
  60. GRB 110411A: Swift detection of a burst
  61. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  62. GRB 110407A: Enhanced Swift-XRT position
  63. GRB 100407A : Errata of afterglow position in GCN 11899
  64. GRB 110407A : Lulin optical afterglow detection
  65. GRB 110407A: Prompt enhanced Swift-XRT position
  66. GRB 110407A: Swift detection of a burst
  67. Konus-Wind observation of GRB 110406A
  68. GRB 110213A, the review of the sky area in plate archives
  69. GRB 110213B: Swift XRT observation
  70. GRB 110212A, Swift-BAT refined analysis
  71. GRB 110212A: Swift detection of a burst
  72. GRB110205A: MITSuME Ishigakijima Optical Observation
  73. GRB 101112A: Maidanak and CrAO optical observations
  74. Konus-Wind observation of GRB 110120A
  75. GRB 101224A, the review of the sky area in plate archives
  76. GRB 101225A: CQUEAN optical observation
  77. GRB 101225a
  78. Short GRB 110106A: MASTER OT observations
  79. GRB 101224A: Swift-XRT refined Analysis
  80. GRB 101224A, Swift-BAT refined analysis
  81. GRB 101224A - UVOT-enhanced XRT position
  82. GRB 101224A: Swift detection of a short burst
  83. GRB 101123A: Fermi GBM detection
  84. Optical observation of GRB 101024A
  85. GRB 101114A: GROND Upper limits
  86. GRB 090113, the review of the sky area in plate archives
  87. GRB 090111, the review of the sky area in plate archives (1976-1996)
  88. GRB 101024A: GROND optical/NIR observations
  89. GRB 101020A, Swift-BAT refined analysis
  90. GRB 101008A: optical observations
  91. GRB 101017A: ROTSE-III Optical Limits
  92. GRB100906A: Ashra-1 observation of early optical emission
  93. GRB 100909A: Faulkes Telescope North afterglow candidate
  94. GRB 100901A: Kanata Telescope observation of the optical afterglow
  95. GRB 100902A: MASTER Prompt Optical Observations
  96. GRB 100901A : HCT optical observations
  97. IPN triangulation of GRB 100826A
  98. GRB 100814A: ISON-NM optical observations
  99. GRB 100805A: IAC80 BVR-band observations
  100. GRB 100805A: Swift detection of a burst with an optical counterpart

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