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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"

35344 results found.

  1. GRB 070612A: NOT observations
  2. GRB 070612B: Optical Observation by MITSuME Akeno
  3. GRB070616: Optical Observation by MITSuME Okayama
  4. GRB 070616, Swift-BAT further refined analysis
  5. GRB 070616: Swift XRT refined circular
  6. GRB 070612A: Possible WSRT Radio Detection
  7. GRB 070616: BTA astrometry and finding chart
  8. GRB 070616: BTA optical observations
  9. GRB 070616: TLS observation
  10. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  11. GRB 070616, Swift-BAT partial refined analysis
  12. GRB 070616: Swift detection of a burst
  13. GRB 070612B: optical observations
  14. VLA upper limit on GRB 070610
  15. GRB 070615
  16. GRB 070615: A long GRB detected by INTEGRAL
  17. SWIFT J195509.6+261406 (GRB 070610): further observations
  18. GRB 070612A: Super-LOTIS observations
  19. GRB 070612A: Rapid Decay
  20. GRB 070612A: Suzaku/WAM observation of the prompt emission
  21. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  22. GRB070612A: MITSuME Okayama Observation
  23. GRB 070612A: continued SARA observations
  24. GRB 070612A: spectral lag
  25. GRB 070611: Watcher Observations
  26. Swift Trigger 282176 is Cygnus X-1
  27. GRB 070612A: MDM Observations
  28. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  29. GRB 070612B: SARA upper limit
  30. GRB 070612B, Swift-BAT refined analysis
  31. GRB 070612A, Swift-BAT refined analysis
  32. GRB 070612B: Swift-XRT refined analysis
  33. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  34. GRB 070612B: Swift/UVOT upper limits
  35. GRB 070612B: FRAM limit
  36. GRB 070612B: KAIT limits
  37. GRB 070612A: SARA detection of possible OT
  38. GRB 070612B: Swift XRT position from downlink data
  39. GRB 070610: TAROT Calern observatory optical observations
  40. GRB 070610: MITSuME OAO optical upper limit
  41. GRB 070612B: Swift detection of a burst
  42. GRB070612 - SDSS Pre-Burst Observations
  43. GRB 070612: Swift detection of a burst
  44. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  45. GRB 070610: SARA upper limit
  46. GRB 070610: Swift-XRT refined analysis
  47. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  48. GRB 070611: Swift/UVOT Observations
  49. GRB 070611: Swift-XRT refined analysis
  50. GRB 070611, Swift-BAT refined analysis
  51. GRB 070610: Optical observations from OSN
  52. GRB 070610: Watcher Observations
  53. GRB 070611: VLT redshift
  54. GRB 060121 : pseudo-z = 1.9 ('intermediate-duration' burst)
  55. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  56. GRB 070611; Swift-XRT position
  57. GRB 070611: ROTSE-III Optical Limits
  58. GRB 070611: Swift detection of a burst
  59. GRB 070610: Swift-UVOT Upper Limits
  60. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  61. GRB 070610, Swift-BAT refined analysis
  62. GRB 070610; Swift-XRT position
  63. GRB 070610: Swift detection of a burst
  64. GRB 070412: TAROT Calern observatory optical observations
  65. GRB 070411: TAROT Calern observatory optical observations
  66. GRB 070419A, deep LBT photometry and possible supernova detection
  67. GRB070520B: optical observations
  68. GRB070520: optical observation
  69. GRB070518: optical observation
  70. GRB070521: optical observation
  71. GRB 070531: NOT nIR observations
  72. GRB 070531: Swift-BAT refined analysis
  73. GRB 070531: I-band observations from IAC80
  74. GRB 070531: Swift-XRT position
  75. GRB 070531: Liverpool Telescope Optical Observations
  76. GRB 070531: Swift detection of a burst
  77. GRB 070529: SARA upper limit
  78. GRB 070529: MARGE Observations
  79. GRB 070529: Optical aterglow from MIRO
  80. GRB 070529: Gemini Redshift
  81. GRB 070529: Swift-XRT refined analysis
  82. GRB 070529, Swift-BAT refined analysis
  83. GRB 070529: Xinglong TNT Optical Upper Limit
  84. GRB 070529: Swift detection of a burst with an optical aterglow
  85. GRB 070412: Deep Keck imaging
  86. Swift trigger 280447 is probably a Galactic transient
  87. GRB 070518, deep LBT photometry
  88. GRB 070518: MARGE Observations
  89. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  90. Konus-Wind observation of GRB 070521
  91. GRB 070518: optical observation
  92. GRB070520B: NIR observations
  93. GRB 070521: Swift/UVOT Upper Limits
  94. GRB 070521, optical observation
  95. GRB 070521: Swift-XRT refined analysis
  96. GRB 070521: Keck imaging
  97. GROND upper limits of GRB 070521
  98. GRB 070521 Milagro GeV/TeV Observations
  99. GRB 070520B: SARA upper limit
  100. GRB 070520A: SARA upper limit

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