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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"

5050 results found.

  1. GRB 111204A: MASTER optical observations
  2. GRB 111123A, GROND observations
  3. GRB 111121A: Swift detection of a short hard burst
  4. GRB 111117A: optical upper limit in CrAO
  5. XRF 111111A/MAXI J0158-744: MAXI GSC and SSC detection of a soft X-ray transient near SMC
  6. Continued Skynet observations of GRB111107A
  7. GRB 111107A: Swift detection of a burst with an optical counterpart
  8. Trigger 506913: MASTER detection of Swift J1922.7-1716 optical counterpart
  9. GRB 111022B: MASTER OT observations
  10. IPN Triangulation of GRB 111016B (long duration, intense)
  11. GRB 111018A: Swift detection of a burst
  12. Fermi GBM triggers 110923481, 110924391 and 110925200 are not GRBs
  13. MAXI/GSC detection of a short soft X-ray transient
  14. GRB 110915B: SuperAGILE localization of a long GRB
  15. GRB 110731A: SAO RAS and Terskol observations
  16. IPN triangulation of GRB110825A (very intense, long-duration)
  17. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  18. IPN triangulation of GRB110815A (long, intense)
  19. IPN triangulation of GRB 110808B (short/hard/intense)
  20. SGR J1834.9-0846: A Neutron Star in W41?
  21. Konus-Wind observation of GRB 110802A
  22. GRB 110801A: SAO RAS optical observations
  23. GRB 110801A: Evidence for a jet break
  24. GRB 110801A: MASTER OT observations
  25. AXP 4U 0142+61: Fermi GBM detection
  26. AXP 4U 0142+61: Swift-BAT refined analysis
  27. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  28. GRB 110709A: Suzaku WAM observation of the prompt emission
  29. Konus-Wind observation of GRB 110709A
  30. GRB110709A: upper limits from CAHA 1.23m and OSN 1.5m
  31. GRB 110709A: Fermi GBM observation
  32. GRB 110709A: Swift detection of a burst
  33. GRB 110625A: Suzaku WAM observation of the prompt emission
  34. GRB 110625A: GROND detection of a source inside the XRT error circle
  35. Konus-Wind observation of GRB 110625A
  36. GRB 110610A: Swift detection of a burst
  37. GRB 110530A: optical observations at Mt. Terskol
  38. GRB 110520A: Swift detection of a burst
  39. GRB 110519A: Swift detection of a burst
  40. GRB 110503A: R-band Detection
  41. GRB 110422A: Update of Herschel FIR observation schedule
  42. GRB 110422A: optical observations in CrAO, second epoch
  43. GRB 110420A: Swift detection of a burst with optical counterpart
  44. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  45. GRB 110414A : Faulkes Telescope North observations
  46. GRB 110411A: MASTER prompt and follow-up optical limits
  47. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  48. GRB 100407A : Errata of afterglow position in GCN 11899
  49. GRB 110407A : Lulin optical afterglow detection
  50. GRB 110407A: Prompt enhanced Swift-XRT position
  51. GRB 110402A: further NOT observations
  52. GRB 110328A / Swift J164449.3+573451: Infrared transient
  53. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  54. Fermi Gamma-ray Burst Monitor trigger 322686470 (110324797) is not a GRB
  55. GRB 110319B: GROND upper limits
  56. GRB 110301A: Fermi GBM detection
  57. Swift XRT and UVOT Observations of OT 110215
  58. OT 110215: NIR observations from NOT of GRB candidate
  59. OT 110215: possible GRB from 2MASS J00264184+8324093
  60. GRB 110213A: THO optical observations
  61. GRB 110212A: SARA-N Optical Limits
  62. GRB110205A: MITSuME Ishigakijima Optical Observation
  63. GRB 110205A: GRAS005 optical observations
  64. GRB 110106B, radio observations
  65. GRB 110120A: MASTER optical observations
  66. GRB 110120A: MASTER optical observations
  67. GRB110119A: MITSuME Okayama optical upper limits
  68. New feature in Fermi GBM GRB Ground Position Notices
  69. Short GRB 110112B : early optical limit by "Pi of the Sky"
  70. GRB 110112B: Fermi GBM observation
  71. GRB 110112B: A short GRB detected by INTEGRAL
  72. GRB 110112A: MASTER optical observations
  73. GRB 110106B: MASTER optical observations
  74. GRB 110112A: Swift detection of a possible short burst
  75. GRB 110106B: Swift-XRT refined Analysis
  76. GRB 101225A: Swift-XRT refined Analysis
  77. GRB 101224A: Fermi GBM observation
  78. GRB101224A: MITSuME Okayama optical upper limits
  79. GRB 101219B: Swift-XRT refined Analysis
  80. GRB 101219A: Swift-XRT refined Analysis
  81. GRB 101213A: Swift-XRT refined Analysis
  82. GRB 101213A: Swift detection of a burst
  83. GRB 101204A: Swift-XRT refined Analysis
  84. GRB 101201A: Swift-XRT refined Analysis
  85. Optical observation of GRB 101024A
  86. GRB 101117B: Swift-XRT refined analysis
  87. XRF101117A: MAXI/GSC detection of a short X-ray transient
  88. GRB 101112A - XRT source detection/analysis
  89. GRB 101112A: a long GRB detected by INTEGRAL
  90. GRB 101030A : Swift XRT refined analysis
  91. GRB 101024A: Swift XRT refined analysis
  92. GRB 101023A: miniTAO/ANIR NIR detection
  93. GRB 101024A: Fermi GBM observation
  94. GRB 101024A: GRAS06 optical observations
  95. GGRB 101023A: GROND detection of the optical-NIR afterglow
  96. GRB 101023A: Swift-XRT Team Refined Analysis
  97. GRB 101023A: Gemini discovery of optical afterglow
  98. GRB 101011A: XRT Refined Analysis
  99. GRB 101008A: Swift-XRT refined analysis
  100. GRB 100924A: Fermi GBM observation

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