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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"

21977 results found.

  1. GRB 070612A: Second Epoch WSRT Radio Observations
  2. GRB070621: RTT150 optical observations
  3. GRB 070621: VLT optical observations
  4. GRB 070621: Swift/UVOT Upper Limits
  5. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  6. WHT observations of GRB070621
  7. GRB 070621: Gemini South optical imaging
  8. Observations of GRB070612A at Calar Alto
  9. GRB 070621: NOT observations
  10. GRB070621: OPTIMA-Burst optical upper limit
  11. GRB 070621: TAROT Calern observatory optical observations
  12. GRB 070621: Watcher Observations
  13. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  14. GRB 070612A: TNG optical observations
  15. Swift/UVOT detection of GRB070616 optical afterglow.
  16. GRB070612A: Gemini Spectroscopic Redshift
  17. GRB 070612A: NOT observations
  18. GRB 070612A: Possible WSRT Radio Detection
  19. GRB 070616: BTA optical observations
  20. Swift/UVOT observations of GRB070616
  21. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  22. GRB 070612B: optical observations
  23. UVOT Observations of INTEGRAL burst GRB070615
  24. GRB 070615
  25. SWIFT J195509.6+261406 (GRB 070610): further observations
  26. GRB 070612A: Super-LOTIS observations
  27. GRB 070612A: Rapid Decay
  28. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  29. GRB070612A: MITSuME Okayama Observation
  30. GRB 070612A: continued SARA observations
  31. GRB 070611: Watcher Observations
  32. GRB 070612A: MDM Observations
  33. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  34. GRB 070612B: SARA upper limit
  35. GRB 070612B: Swift-XRT refined analysis
  36. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  37. GRB 070612B: Swift/UVOT upper limits
  38. GRB070612B: P60 Observations
  39. GRB 070612B: KAIT limits
  40. GRB 070612A: SARA detection of possible OT
  41. GRB 070610: TAROT Calern observatory optical observations
  42. GRB070612 - SDSS Pre-Burst Observations
  43. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  44. GRB 070610: SARA upper limit
  45. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  46. GRB 070611: Swift/UVOT Observations
  47. GRB 070610: Optical observations from OSN
  48. GRB 070610: Watcher Observations
  49. GRB 060121 : pseudo-z = 1.9 ('intermediate-duration' burst)
  50. GRB 070611; Swift-XRT position
  51. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  52. GRB 070610; Swift-XRT position
  53. GRB 070412: TAROT Calern observatory optical observations
  54. GRB 070411: TAROT Calern observatory optical observations
  55. GRB 070419A, deep LBT photometry and possible supernova detection
  56. GRB070520B: optical observations
  57. GRB 070531: NOT nIR observations
  58. GRB 070531: I-band observations from IAC80
  59. GRB 070531: Liverpool Telescope Optical Observations
  60. GRB 070529: SARA upper limit
  61. GRB 070529: MARGE Observations
  62. GRB 070529: Optical aterglow from MIRO
  63. GRB 070412: Deep Keck imaging
  64. GRB 070518, deep LBT photometry
  65. GRB 070518: MARGE Observations
  66. GRB070521: Second Epoch Gemini Imaging
  67. GRB070521: NIR observations
  68. GRB070520B: NIR observations
  69. GRB 070521: Swift/UVOT Upper Limits
  70. GRB 070521: Keck imaging
  71. GRB070521: Gemini Observations
  72. GROND upper limits of GRB 070521
  73. GRB 070521 Milagro GeV/TeV Observations
  74. GRB 070521: Subaru observations and possible host detection
  75. GRB070518: Optical/NIR observation
  76. GRB 070520B: Swift/UVOT Upper Limits
  77. GRB 070520A: Subaru Observations
  78. GRB 070520A: Swift UVOT Upper Limits
  79. GRB 070521: optical limit by Pi of the Sky
  80. GRB070521: P200 Observations
  81. GRB070521 : Faulkes Telescope North Observations
  82. GRB 070521: TAROT La Silla observatory optical observations
  83. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  84. GRB070521 - SDSS Pre-Burst Observations
  85. GRB 070518: TNG observations
  86. GRB 070517: Gemini optical imaging
  87. GRB 070509: objects inside XRT error circle
  88. GRB070419A: optical observations
  89. GRB 070419A, Deep LBT photometry
  90. GRB 070509: Swift/UVOT Upper Limits
  91. GRB 070508: OA fading and tentative redshift
  92. GRB 070509: REM observations
  93. GRB070508: Swift/UVOT Observations
  94. GRB 070508: Multicolor optical observations and possible redshift limit
  95. GRB 070508: Swift-XRT refined analysis
  96. GRB 070508: Optical observation limiting magnitude
  97. GRB 070508: REM observations
  98. GRB 070508: TAROT La Silla observatory optical observations
  99. GRB070506: Swift/UVOT Observations
  100. GRB070506: Swift XRT refined analysis

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