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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"

20480 results found.

  1. GRB 120118B: TNG NIR observations
  2. GRB 120118B : Lulin Optical limit
  3. GRB 120119A: PROMPT optical observation of early afterglow
  4. GRB 120119A: GROND Detection of the Optical/NIR Afterglow
  5. GRB 120118B: Swift/UVOT Upper Limits
  6. GRB 120119A: Liverpool Telescope afterglow detection
  7. GRB 120119A: PAIRITEL NIR Detection
  8. GRB 120118B: NOT observations
  9. GRB 120118B: Faulkes Telescope South observations
  10. GRB 120118B: MASTER optical observations
  11. XRF 120118A: Optical candidate
  12. GRB 120116A: Swift/UVOT Upper Limits
  13. AXP 4U 1042+61: Mondy optical observations
  14. GRB 120116A: Mondy optical observations
  15. GRB 120116A: EVLA observations
  16. GRB 120116A: WHT optical observations
  17. GRB 120116A: Optical observations at Crni Vrh
  18. GRB 120116A: NOT observations
  19. GRB 120116A: IAC80 I-band observations
  20. GRB 120116A: Bassano Bresciano Observatory optical observations
  21. GRB 111228A: optical observations
  22. IPN Triangulation of GRB 120107A
  23. GRB 120106A: Swift/UVOT Upper Limits
  24. GRB 120106A: Bassano Bresciano Observatory optical observations
  25. GRB 120106A: MITSuME Okayama Ks-band upper limit
  26. GRB 120106A: TAROT Calern observatory optical observations
  27. GRB 120106A: MASTER-Tunka optical observations
  28. GRB111228A :LOAO R-band Observations
  29. GRB 111222A: Fermi GBM observations
  30. GRB 111222A: Second Swift observation
  31. GRB111209A: ATCA detection at 5.5, 9, and 18GHz
  32. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  33. GRB 111228A: optical observations in CrAO
  34. GRB 120102A: Swift/UVOT Detection
  35. GRB 111225A: optical observations in CrAO
  36. GRB 111228A, optical observations
  37. GRB 111228A: Optical and NIR observations with Kanata telescope
  38. GRB 111228A: SMARTS optical/IR afterglow observations
  39. GRB 111229A: Swift/UVOT Detection
  40. GRB 111229A: Faulkes Telescope South observations
  41. GRB 111228A: Continued Skynet PROMPT/Dolomiti Optical Observations
  42. GRB111228A: Further GMG observations
  43. GRB 111229A: GROND afterglow candidate
  44. GRB 111228A: Liverpool Telescope Observations
  45. GRB 111225A: Lightbuckets Optical Observations
  46. GRB 111228A: P60 Observations
  47. GRB 111228A: T100 observations
  48. GRB 111228A: GMG optical observation
  49. GRB 111228A: NOT redshift
  50. FERMI GRB111228.45: MASTER observations
  51. GRB 111228A: Gemini South Redshift
  52. GRB 111228A: PAIRITEL NIR Detection
  53. GRB 111228A: MMT Redshift
  54. GRB 111228A: TAROT La Silla observatory observations
  55. GRB 111228A: GROND observations
  56. GRB 111228A: MASTER OT observations
  57. GRB 111228A: GRAS017 optical observations
  58. GRB 111228A: IAC80 BVI-band observations
  59. GRB 111228A: Swift/UVOT Detection
  60. GRB 111228A: Skynet/Dolomiti Optical Observations
  61. GRB 111228A: NOT optical observation
  62. GRB 111228A: optical observations
  63. GRB 111228A: TAROT Calern observatory. OT decay stopped
  64. GRB 111228A, optical observations
  65. GRB 111228A: TAROT Calern observatory. OT seems still bright
  66. GRB 111225A, optical observations
  67. GRB 111228A: Xinglong TNT confirms the optical afterglow
  68. GRB 111205A: optical observations
  69. GRB 111225A: Swift/UVOT Observations
  70. GRB 111225A: PAIRITEL NIR Upper Limits
  71. GRB 111225A: 1.23m CAHA optical observations
  72. GRBv111225A: Xinglong TNT optical afterglow
  73. GRB 111225A: Super-LOTIS early detection
  74. GRB 111225A: TAROT Calern observatory optical observations
  75. GRB111222A: GMG optical observation
  76. GRB 111222A: Xinglong TNT observation
  77. GRB 111222A: Swift/UVOT Observations
  78. GRB 111222A: Swift-XRT observations
  79. GRB 111215A: EVLA observations
  80. GRB 110820A: optical observations in Maidanak observatory
  81. GRB 111215B: Swift/UVOT Upper Limits
  82. GRB 111215B: Swift-XRT observations
  83. GRB 111215A: WHT, LT and NOT imaging
  84. GRB 111215A: TNG K-band observations
  85. GRB 111215A: Swift/UVOT Upper Limits
  86. Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
  87. GRB 111215A: OSN I-band observations
  88. GRB 111215A: MASTER-Net optical prompt and follow up observations
  89. GRB 111215A, Optical Observations
  90. GRB 111215A: GMG optical upper limit
  91. GRB 111215A : Xinglong TNT upper limit
  92. GRB 111212A: GROND observations
  93. GRB 111211A: VLT/X-shooter redshift
  94. GRB 111211A: NOT afterglow confirmation
  95. GRB 111211A: Swift/XRT target of opportunity observation
  96. GRB 111212A: Swift/UVOT Upper Limits
  97. GRB 111212A: Swift-XRT observations
  98. GRB 111211A: GROND afterglow candidate
  99. GRB 111210A: Xinglong TNT upper limit
  100. GRB 111209A - ATCA 34GHz upper limit

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