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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').
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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"

45422 results found.

  1. GRB 111228A: X-shooter spectroscopy
  2. GRB 111228A: T100 observations
  3. GRB111228A: MITSuME Akeno photometry of the optical afterglow
  4. GRB 111228A: GMG optical observation
  5. GRB 111228A: Swift-XRT refined Analysis
  6. GRB 111228A: NOT redshift
  7. GRB111228A: TNG spectroscopy analysis
  8. FERMI GRB111228.45: MASTER observations
  9. GRB 111228A: Gemini South Redshift
  10. GRB 111228A: PAIRITEL NIR Detection
  11. GRB 111228A: MMT Redshift
  12. GRB 111228A: TAROT La Silla observatory observations
  13. GRB 111228A: GROND observations
  14. GRB 111228A: MASTER OT observations
  15. GRB111228A: Errata of MITSuME Okayama about GRB name in GCNC 12743
  16. GRB 111228A: GRAS017 optical observations
  17. GRB 111228A: IAC80 BVI-band observations
  18. GRB 111228A: Swift/UVOT Detection
  19. GRB 111228A: Skynet/Dolomiti Optical Observations
  20. GRB 111228A: NOT optical observation
  21. GRB 111228A, Swift-BAT refined analysis
  22. GRB 111228A: optical observations
  23. GRB 111228A: Enhanced Swift-XRT position
  24. GRB 111228A: TAROT Calern observatory. OT decay stopped
  25. GRB 111228A, optical observations
  26. GRB 111228A: Fermi GBM observation
  27. GRB111228A: MITSuME Okayama Optical Observation
  28. GRB 111228A: TAROT Calern observatory. OT seems still bright
  29. GRB 111228A: Possible host galaxy in the SDSS arhive
  30. GRB 111225A, optical observations
  31. XMM-Newton observation of the short GRB 111020A
  32. GRB 111228A: Xinglong TNT confirms the optical afterglow
  33. GRB 111228A: Swift detection of a burst with an optical counterpart
  34. GRB 111205A: optical observations
  35. GRB 111225A: Swift/UVOT Observations
  36. GRB 111215A: Keck/LRIS Imaging
  37. GRB 111225A: Keck/LRIS Afterglow Photometry
  38. GRB 111222A : Suzaku WAM observation of the prompt emission
  39. GRB 111225A: PAIRITEL NIR Upper Limits
  40. GRB111225A: MITSuME Okayama optical upper limits
  41. GRB 111225A: GRT Optical Observation
  42. GRB 111225A: 1.23m CAHA optical observations
  43. GRB 111225A: Swift-XRT refined Analysis
  44. GRB 111225A, Swift-BAT refined analysis
  45. GRBv111225A: Xinglong TNT optical afterglow
  46. GRB 111225A: Enhanced Swift-XRT position
  47. GRB 111225A: Super-LOTIS early detection
  48. GRB 111225A: TAROT Calern observatory optical detection
  49. GRB 111225A: TAROT Calern observatory optical observations
  50. GRB 111225A: Swift detection of a burst with an optical counterpart
  51. GRB111222A: GMG optical observation
  52. GRB 111222A: Xinglong TNT observation
  53. GRB 111222A: Swift/UVOT Observations
  54. GRB 111222A: Swift-XRT observations
  55. Konus-Wind observation of GRB 111222A
  56. IPN Triangulation of GRB 111222A (short/hard/intense)
  57. GRB 111210A: optical upper limit of Mt. Terskol observatory
  58. Trigger 510075 is not a GRB
  59. GRB 111215A: EVLA observations
  60. XRT GRB Catalogue now live and online
  61. GRB 111103B: optical upper limit
  62. GRB 110820A: optical observations in Maidanak observatory
  63. GRB 111103A: optical upper limit of Mt. Terskol observatory
  64. GRB 111215B: Suzaku WAM observation of the prompt emission
  65. GRB 111211A: optical ovservations at Mt. Terskol observatory
  66. GRB111215A: optical upper limit
  67. GRB 111215B: Swift/UVOT Upper Limits
  68. Konus-Wind observation of GRB 111215B
  69. GRB 111215B: Swift-XRT observations
  70. GRB 111205A: Confirmation of X-ray Afterglow
  71. IPN Triangulation of GRB 111215B (long/intense)
  72. GRB111215A: Pre-Outburst Palomar 48 inch Imaging
  73. GRB 111215A: WHT, LT and NOT imaging
  74. GRB 111215A: TNG K-band observations
  75. GRB 111215A: MITSuME Okayama Optical upper limits
  76. GRB 111215A: Swift/UVOT Upper Limits
  77. GRB 111215A: Swift-XRT refined Analysis
  78. Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
  79. GRB 111215A: Enhanced Swift-XRT position
  80. GRB 111215A: Swift-BAT refined analysis
  81. GRB 111215A: OSN I-band observations
  82. GRB 111215A: MASTER-Net optical prompt and follow up observations
  83. GRB 111215A, Optical Observations
  84. GRB 111215A: MITSuME Akeno Optical upper limits
  85. GRB 111209A: RAPTOR Limits Before and During the Gamma-ray Emitting Interval
  86. GRB 111215A: GMG optical upper limit
  87. GRB 111215A : Xinglong TNT upper limit
  88. GRB 111215A: Swift detection of a burst
  89. GRB 111201A, the review of the sky area in plate archive
  90. GRB 111212A: GROND observations
  91. GRB 111211A: Swift/UVOT Detection
  92. GRB 111211A: VLT/X-shooter redshift
  93. Konus-Wind observation of GRB 111211A
  94. GRB 111211A: NOT afterglow confirmation
  95. GRB 111212A: Swift-XRT refined Analysis
  96. GRB 111211A: Swift/XRT target of opportunity observation
  97. GRB 111212A: Swift/UVOT Upper Limits
  98. GRB 111212A: Swift-BAT refined analysis
  99. GRB 111212A: Enhanced Swift-XRT position
  100. GRB 111212A: Swift-XRT observations

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