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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"

44404 results found.

  1. GRB 120118B: MASTER optical observations
  2. GRB 120118B: Swift detection of a burst
  3. XRF 120118A: Optical candidate
  4. XRF 120118A: further INTEGRAL analysis
  5. XRF 120118A: an X-Ray Flash detected by INTEGRAL
  6. GRB 120116A: Swift/UVOT Upper Limits
  7. GRB 120116A: Swift-XRT refined Analysis
  8. GRB 120116A: Enhanced Swift-XRT position
  9. AXP 4U 1042+61: Mondy optical observations
  10. GRB 120116A: Mondy optical observations
  11. GRB 120116A: Gemini optical/IR candidate
  12. GRB 120116A: EVLA observations
  13. GRB 120116A: WHT optical observations
  14. GRB 120116A: Optical observations at Crni Vrh
  15. GRB 120116A: Swift-BAT refined analysis
  16. GRB 120116A: NOT observations
  17. GRB 120116A: IAC80 I-band observations
  18. GRB 120116A: Bassano Bresciano Observatory optical observations
  19. GRB 120116A: MASTER Early optical limit
  20. GRB 120116A: Swift detection of a burst
  21. GRB 120114A found in ground analysis of BAT data
  22. GRB 111228A: optical observations
  23. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  24. GRB 120106A: optical upper limit
  25. Swift detection of an SGR burst from AXP 4U 0142+61
  26. GRB 120107A: Suzaku WAM observation of the prompt emission
  27. GRB 110915B, the review of the sky area in plate archives
  28. GRB 120107A: Fermi GBM observation
  29. GRB 120106A: MITSuME Okayama Optical Observation (update)
  30. Konus-Wind observation of GRB 120107A
  31. IPN Triangulation of GRB 120107A
  32. GBM trigger 347620337 (GRB 120107A?) : High-energy photon emission in Fermi/LAT data
  33. GRB 120106A: Swift/UVOT Upper Limits
  34. GRB 120106A: Bassano Bresciano Observatory optical observations
  35. GRB 120106A: MITSuME Okayama Ks-band upper limit
  36. GRB 120106A: MASTER Early OT marginally detection
  37. GRB 120106A: Swift-XRT refined Analysis
  38. INTEGRAL Weak trigger #6433: GRT Optical Observation
  39. GRB 120106A: Swift-BAT refined analysis
  40. GRB 120106A: MITSuME Okayama Optical upper limits
  41. GRB 120106A: Enhanced Swift-XRT position
  42. GRB 120106A: TAROT Calern observatory optical observations
  43. GRB 120106A: MASTER-Tunka optical observations
  44. GRB 120106A: Swift detection of a burst
  45. GRB111228A :LOAO R-band Observations
  46. GRB 111225A, the review of the sky area in plate archives
  47. GRB 111222A, the review of the sky area in plate archives
  48. GRB 111222A: Fermi GBM observations
  49. GRB 111222A: Second Swift observation
  50. GRB111209A: ATCA detection at 5.5, 9, and 18GHz
  51. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  52. GRB 111211A: Detection of the SN with the 10.4m GTC
  53. GRB 120102A: Fermi GBM observation
  54. Konus-Wind observation of GRB 120102A
  55. GRB 120102A: Swift-BAT refined analysis
  56. GRB 111228A: optical observations in CrAO
  57. GRB 120102A: Swift-XRT refined Analysis
  58. GRB 120102A: Swift/UVOT Detection
  59. GRB 120102A: Enhanced Swift-XRT position
  60. GRB 120102A: Swift detection of a burst with an optical counterpart
  61. GRB 111225A: optical observations in CrAO
  62. GRB 111228A, optical observations
  63. GRB 111228A: LOAO Optical Observation
  64. Konus-Wind observation of GRB 111228A
  65. GRB 111228A: MASTER-Net optical photometry
  66. GRB 111228A: correction for GCN 12787
  67. GRB 111228A: Optical and NIR observations with Kanata telescope
  68. GRB 110915A, the review of the sky area in plate archives
  69. GRB 111228A: SMARTS optical/IR afterglow observations
  70. GRB 111229A: Swift/UVOT Detection
  71. GRB 111229A: Faulkes Telescope South observations
  72. GRB 111229A: Swift-XRT refined Analysis
  73. GRB 111229A: Enhanced Swift-XRT position
  74. GRB 111228A: Continued Skynet PROMPT/Dolomiti Optical Observations
  75. GRB111228A: Further GMG observations
  76. GRB 111229A: Gemini-South Redshift
  77. GRB 111229A: Swift-BAT refined analysis
  78. GRB 111229A: GROND afterglow candidate
  79. GRB 111229A: Swift detection of a burst
  80. GRB 111228A: Liverpool Telescope Observations
  81. GRB 111225A: Lightbuckets Optical Observations
  82. GRB 111228A: P60 Observations
  83. GRB 111228A: X-shooter spectroscopy
  84. GRB 111228A: T100 observations
  85. GRB111228A: MITSuME Akeno photometry of the optical afterglow
  86. GRB 111228A: GMG optical observation
  87. GRB 111228A: Swift-XRT refined Analysis
  88. GRB 111228A: NOT redshift
  89. GRB111228A: TNG spectroscopy analysis
  90. FERMI GRB111228.45: MASTER observations
  91. GRB 111228A: Gemini South Redshift
  92. GRB 111228A: PAIRITEL NIR Detection
  93. GRB 111228A: MMT Redshift
  94. GRB 111228A: TAROT La Silla observatory observations
  95. GRB 111228A: GROND observations
  96. GRB 111228A: MASTER OT observations
  97. GRB111228A: Errata of MITSuME Okayama about GRB name in GCNC 12743
  98. GRB 111228A: GRAS017 optical observations
  99. GRB 111228A: IAC80 BVI-band observations
  100. GRB 111228A: Swift/UVOT Detection

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