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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"

45700 results found.

  1. GRB 120212A: Errata of subject in GCNC 12936
  2. GRB 120212A: Enhanced Swift-XRT position
  3. GRB 120211A: MITSuME Okayama Ks-band Observation
  4. GRB 120212A: Kanata/HOWPol optical observation
  5. GRB 120212A: Swift-XRT observations
  6. GRB 120212A: Swift/UVOT detection
  7. GRB 120212A: Faulkes Telescope South afterglow candidate
  8. GRB 120211A: GROND Upper limits
  9. GRB 120212A: Swift detection of a burst
  10. GRB 120211A: MITSuME Okayama and Ishigakijima Optical upper limits
  11. GRB 120211A, optical observations
  12. GRB 120211A: Swift-XRT refined Analysis
  13. GRB 120211A: Swift/UVOT Upper Limits
  14. GRB 120211A: MASTER early optical observations
  15. GRB 120211A: Swift-BAT refined analysis
  16. GRB 120211A: MITSuME Okayama Ks-band upper limit
  17. GRB 120211A: Enhanced Swift-XRT position
  18. GRB 120211A - Faulkes Telescope South Observations
  19. GRB 120211A: Swift detection of a burst
  20. GRB 120202A, the review of the sky area in plate archives
  21. GRB 111228A, the review of the sky area in plate archives
  22. GRB 120202A: MASTER early optical observations
  23. LS I +61 303: Swift-BAT refined analysis
  24. GRB 120202A: D50 optical limits
  25. Swift detection of a burst from LS I +61 303
  26. GRB 120202A: GROND observations
  27. GRB 120202A: WHT, Gemini & UKIRT candidate afterglow
  28. GRB 120202A: Swift/XRT and UVOT observations
  29. GRB 120202A: TAROT Calern observatory optical observations
  30. GRB 120202A: A long GRB detected by INTEGRAL
  31. GRB 111228A: Possible host detected by Swift/UVOT
  32. GRB 120129A: MASTER optical observations
  33. GRB 120116A, the review of the sky area in plate archives
  34. Konus-Wind observation of GRB 120129A
  35. IPN Triangulation of GRB 120129A (long/intense)
  36. GRB 120127A / P48 Imaging
  37. GRB 120127A: MASTER optical observations
  38. GRB 120127A: MAXI/GSC detection of a probable GRB
  39. GRB 120118B: optical upper limit
  40. GRB 120116A: optical upper limit
  41. GRB 120119A : LOAO Optical Observations
  42. GRB 120119A : SMA submm follow-up observation
  43. Fermi GBM trigger 120123.169 is not a GRB
  44. GRB 120119A: EVLA observations
  45. GRB 120119A: GRT detection of early afterglow
  46. GRB 111225A: optical observations
  47. GRB 120119A: optical upper limit
  48. GRB 120121A: Swift/UVOT Upper Limits
  49. GRB 120121A: Swift-XRT refined Analysis
  50. GRB 120121A: Swift-BAT refined analysis
  51. GRB 120121A: Enhanced Swift-XRT position
  52. GRB 120121A: ISON-NM optical observations
  53. GRB 120121A: Swift-XRT position
  54. GRB 120121A: Swift detection of a burst
  55. GRB 120119A, Swift-BAT refined analysis
  56. GRB 120119A: TAROT La Silla observatory optical observations
  57. GRB120119A: REM NIR observations
  58. GRB 120119A: optical observations
  59. GRB 120119A: Swift/UVOT Observations
  60. GRB 120118B: RTT150 optical observations
  61. GRB 120119A: SMARTS optical/IR afterglow observations
  62. GRB 120119A: Swift-XRT refined Analysis
  63. GRB 120119A: Enhanced Swift-XRT position
  64. GRB 120102A, the review of the sky area in plate archive
  65. GRB 120119A: Fermi GBM observation
  66. GRB 120118B, Swift-BAT refined analysis
  67. Konus-Wind observation of GRB 120119A
  68. GRB 120119A: optical observations
  69. GRB 120118B: TNG NIR observations
  70. GRB 120118B: Swift-XRT refined Analysis
  71. GRB 120118B : Lulin Optical limit
  72. GRB 120119A: MMT redshift confirmation
  73. GRB 120119A: Lick 3m Spectroscopy
  74. GRB 120119A: Gemini-S redshift
  75. GRB 120119A: PROMPT optical observation of early afterglow
  76. GRB 120119A: GROND Detection of the Optical/NIR Afterglow
  77. GRB 120118B: Swift/UVOT Upper Limits
  78. GRB 120119A: Liverpool Telescope afterglow detection
  79. GRB 120119A: PAIRITEL NIR Detection
  80. GRB 120119A: Swift detection of a burst with an optical counterpart
  81. GRB 120118B: NOT observations
  82. GRB 120118B: Enhanced Swift-XRT position
  83. GRB 120118B: Faulkes Telescope South observations
  84. XRF 120118A: early optical limit by "Pi of the Sky"
  85. GRB 120118B: Swift-XRT position
  86. GRB 120118B: MASTER optical observations
  87. GRB 120118B: Swift detection of a burst
  88. XRF 120118A: Optical candidate
  89. XRF 120118A: further INTEGRAL analysis
  90. XRF 120118A: an X-Ray Flash detected by INTEGRAL
  91. GRB 120116A: Swift/UVOT Upper Limits
  92. GRB 120116A: Swift-XRT refined Analysis
  93. GRB 120116A: Enhanced Swift-XRT position
  94. AXP 4U 1042+61: Mondy optical observations
  95. GRB 120116A: Mondy optical observations
  96. GRB 120116A: Gemini optical/IR candidate
  97. GRB 120116A: EVLA observations
  98. GRB 120116A: WHT optical observations
  99. GRB 120116A: Optical observations at Crni Vrh
  100. GRB 120116A: Swift-BAT refined analysis

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