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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"

21011 results found.

  1. GRB 070612B: optical observations
  2. UVOT Observations of INTEGRAL burst GRB070615
  3. GRB 070615
  4. SWIFT J195509.6+261406 (GRB 070610): further observations
  5. GRB 070612A: Super-LOTIS observations
  6. GRB 070612A: Rapid Decay
  7. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  8. GRB070612A: MITSuME Okayama Observation
  9. GRB 070612A: continued SARA observations
  10. GRB 070611: Watcher Observations
  11. GRB 070612A: MDM Observations
  12. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  13. GRB 070612B: SARA upper limit
  14. GRB 070612B: Swift-XRT refined analysis
  15. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  16. GRB 070612B: Swift/UVOT upper limits
  17. GRB070612B: P60 Observations
  18. GRB 070612B: KAIT limits
  19. GRB 070612A: SARA detection of possible OT
  20. GRB 070610: TAROT Calern observatory optical observations
  21. GRB070612 - SDSS Pre-Burst Observations
  22. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  23. GRB 070610: SARA upper limit
  24. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  25. GRB 070611: Swift/UVOT Observations
  26. GRB 070610: Optical observations from OSN
  27. GRB 070610: Watcher Observations
  28. GRB 070611; Swift-XRT position
  29. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  30. GRB 070610; Swift-XRT position
  31. GRB 070412: TAROT Calern observatory optical observations
  32. GRB 070411: TAROT Calern observatory optical observations
  33. GRB 070419A, deep LBT photometry and possible supernova detection
  34. GRB070520B: optical observations
  35. GRB 070531: NOT nIR observations
  36. GRB 070531: I-band observations from IAC80
  37. GRB 070531: Liverpool Telescope Optical Observations
  38. GRB 070529: SARA upper limit
  39. GRB 070529: MARGE Observations
  40. GRB 070529: Optical aterglow from MIRO
  41. GRB 070518, deep LBT photometry
  42. GRB 070518: MARGE Observations
  43. GRB070521: Second Epoch Gemini Imaging
  44. GRB070521: NIR observations
  45. GRB070520B: NIR observations
  46. GRB 070521: Swift/UVOT Upper Limits
  47. GRB070521: Gemini Observations
  48. GROND upper limits of GRB 070521
  49. GRB 070521 Milagro GeV/TeV Observations
  50. GRB 070521: Subaru observations and possible host detection
  51. GRB070518: Optical/NIR observation
  52. GRB 070520B: Swift/UVOT Upper Limits
  53. GRB 070520A: Subaru Observations
  54. GRB 070520A: Swift UVOT Upper Limits
  55. GRB 070521: optical limit by Pi of the Sky
  56. GRB070521: P200 Observations
  57. GRB070521 : Faulkes Telescope North Observations
  58. GRB 070521: TAROT La Silla observatory optical observations
  59. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  60. GRB070521 - SDSS Pre-Burst Observations
  61. GRB 070518: TNG observations
  62. GRB 070517: Gemini optical imaging
  63. GRB 070509: objects inside XRT error circle
  64. GRB070419A: optical observations
  65. GRB 070419A, Deep LBT photometry
  66. GRB 070509: Swift/UVOT Upper Limits
  67. GRB 070508: OA fading and tentative redshift
  68. GRB 070509: REM observations
  69. GRB070508: Swift/UVOT Observations
  70. GRB 070508: Multicolor optical observations and possible redshift limit
  71. GRB 070508: Swift-XRT refined analysis
  72. GRB 070508: Optical observation limiting magnitude
  73. GRB 070508: Optical afterglow detection
  74. GRB 070508: REM observations
  75. GRB 070508: TAROT La Silla observatory optical observations
  76. GRB070506: Swift/UVOT Observations
  77. GRB070506: Swift XRT refined analysis
  78. GRB 070429A: Swift XRT further analysis
  79. GRB070429B: VLT observations
  80. GRB 070429A: optical observations
  81. Swift/UVOT observations of GRB070429B
  82. Swift/UVOT observations of GRB070429A
  83. GRB 070429A: Swift XRT refined analysis
  84. GRB 070429A: optical and NIR observations
  85. GRB 070429B: ROTSE-III Optical Limits
  86. LT monitoring of GRB070412
  87. GRB 070420, SMARTS optical/IR afterglow observations
  88. GRB 070411: break in the optical light curve
  89. GRB070419A: Kuiper Optical detection
  90. GRB070419a: Swift UVOT observations
  91. GRB 070419A: MARGE Observations
  92. GRB 070420: optical rebrightening observed at Mt. John
  93. GRB070420: Swift UVOT continuing observations
  94. GRB 070420: Faulkes Telescope South Observations
  95. GRB 070420: TAROT La Silla observatory optical observations
  96. GRB 070420: NIR and optical afterglow confirmed
  97. GRB 070419A: MITSuME Okayama Observations
  98. GRB 070419A: Early Super-LOTIS Observations
  99. GRB 070419A: RAPTOR Detection of Early Emission
  100. GRB 070419: Keck/LRIS Absorption Redshift

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