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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"

15556 results found.

  1. VLA detection of GRB 070612A in C Band
  2. GRB 070628: NIR detection of afterglow
  3. GRB 070628: TAROT La Silla observatory optical observations
  4. GRB 070612A: Allen Telescope Array Observations
  5. OT20050728 was not an optical GRB afterglow
  6. GRB 070616 : WIDGET simultaneous optical observations
  7. GRB 070612A: Second Epoch WSRT Radio Observations
  8. GRB070621: RTT150 optical observations
  9. GRB 070621: VLT optical observations
  10. GRB 070621: Gemini South optical imaging
  11. GRB070621: OPTIMA-Burst optical upper limit
  12. GRB 070621: TAROT Calern observatory optical observations
  13. GRB 070621: ROTSE-III Prompt Optical Limits
  14. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  15. GRB 070612A: TNG optical observations
  16. Swift/UVOT detection of GRB070616 optical afterglow.
  17. GRB070616: Optical Observation by MITSuME Akeno
  18. GRB 070612B: Optical Observation by MITSuME Akeno
  19. GRB070616: Optical Observation by MITSuME Okayama
  20. GRB 070616: Swift XRT refined circular
  21. GRB 070612A: Possible WSRT Radio Detection
  22. GRB 070616: BTA astrometry and finding chart
  23. GRB 070616: BTA optical observations
  24. Swift/UVOT observations of GRB070616
  25. GRB 070612B: optical observations
  26. VLA upper limit on GRB 070610
  27. GRB 070612A: Rapid Decay
  28. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  29. GRB070612A: MITSuME Okayama Observation
  30. GRB 070612A: MDM Observations
  31. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  32. GRB 070610: TAROT Calern observatory optical observations
  33. GRB 070610: MITSuME OAO optical upper limit
  34. GRB 070610: SARA upper limit
  35. GRB 070610: Swift-XRT refined analysis
  36. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  37. GRB 070611: Swift-XRT refined analysis
  38. GRB 070610: Optical observations from OSN
  39. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  40. GRB 070611: ROTSE-III Optical Limits
  41. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  42. GRB 070412: TAROT Calern observatory optical observations
  43. GRB 070411: TAROT Calern observatory optical observations
  44. GRB070520B: optical observations
  45. GRB070520: optical observation
  46. GRB070518: optical observation
  47. GRB070521: optical observation
  48. Swift/UVOT refined analysis of GRB070531
  49. GRB 070531: Liverpool Telescope Optical Observations
  50. Swift/UVOT refined analysis of GRB070529
  51. GRB 070529: Optical aterglow from MIRO
  52. GRB 070529: Xinglong TNT Optical Upper Limit
  53. GRB 070529: Swift detection of a burst with an optical aterglow
  54. GRB 070518: MARGE Observations
  55. GRB 070518: optical observation
  56. GRB070521: NIR observations
  57. GRB070520B: NIR observations
  58. GRB 070521, optical observation
  59. GRB070518: Optical/NIR observation
  60. GRB 070521: optical limit by Pi of the Sky
  61. GRB 070521: TAROT La Silla observatory optical observations
  62. GRB 070520A: MITSuME Akeno optical upper limits
  63. GRB 070518: TNG observations
  64. GRB 070520: Xinglong EST optical Upper Limit
  65. GRB 070517: Gemini optical imaging
  66. GRB070518: OSN observation
  67. GRB 070518: Swift detection of a burst with optical afterglow
  68. GRB 070517: Optical search
  69. GRB070419A: optical observations
  70. GRB 070508: OA fading and tentative redshift
  71. GRB 070509: REM observations
  72. GRB 070509: ROTSE-III Optical Limits
  73. GRB 070508, SMARTS optical afterglow observation
  74. GRB 070508: Multicolor optical observations and possible redshift limit
  75. GRB 070508: Swift-XRT refined analysis
  76. GRB 070508: Optical observation limiting magnitude
  77. GRB 070508: Optical afterglow detection
  78. GRB 070508: REM observations
  79. GRB 070508: TAROT La Silla observatory optical observations
  80. GRB 070508: Swift detection of an intense burst with an optical counterpart
  81. GRB070506: Swift XRT refined analysis
  82. GRB 070506: Swift detection of a burst with optical afterglow
  83. GRB 070412, deep LBT imaging
  84. GRB 070429A: Swift XRT further analysis
  85. GRB 070429A: optical observations
  86. GRB 070429A: Swift XRT refined analysis
  87. GRB 070429A: optical and NIR observations
  88. GRB 070429B: ROTSE-III Optical Limits
  89. GRB 070429: ROTSE-III Optical Limits
  90. GRB 070420, SMARTS optical/IR afterglow observations
  91. GRB 070411: break in the optical light curve
  92. GRB070419A: Kuiper Optical detection
  93. GRB 070420: optical rebrightening observed at Mt. John
  94. GRB 070420: Swift XRT refined analysis
  95. GRB070420: Swift UVOT continuing observations
  96. GRB 070411: BART early limit
  97. GRB 070420: Faulkes Telescope South Observations
  98. GBR 070419A: Swift/XRT refined analysis
  99. GRB 070420: TAROT La Silla observatory optical observations
  100. GRB 070420: NIR and optical afterglow confirmed

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