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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"

19857 results found.

  1. GRB 070911: PAIRITEL IR Observations
  2. GRB 070911: Swift detection of a burst
  3. GRB 070809: Confirmation of optical transient
  4. Candidate Orphan GRB Optical Transient in IC 4779
  5. Las Campanas observations of possible TAROT GRB transient near IC
  6. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  7. GRB 070824 - Combined SuperAGILE/IPN Localization
  8. Konus-Wind observation of very bright GRB 070821
  9. GRB 070731: Swift/UVOT Upper Limit
  10. IPN Localization of GRB 070821 (long, very bright)
  11. GRB 070805: UVOT afterglow candidate retraction
  12. GRB 070810A: ROTSE-III Refined Analysis
  13. GRB 070810B : Faulkes Telescope South Observations
  14. GRB 070810A: Continued Keck Imaging
  15. GRB 070810B: Keck spectroscopy of possible host galaxies
  16. GRB070810B: Swift/UVOT Upper Limits
  17. GRB 070810B: XRT refined analysis
  18. GRB 070810B: Xinglong TNT optical Upper Limit
  19. GRB070810B: Optical observations with KANATA
  20. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  21. GRB 070809: Swift/UVOT Upper Limits
  22. VLA upper limit on the short hard burst GRB 070729
  23. No radio detection in superAGILE burst 070724B
  24. GRB 070809: Keck Imaging
  25. GRB 070810: enhanced Swift-XRT position
  26. GRB 070810: Swift/UVOT Optical Counterpart
  27. GRB 070808: Swift/UVOT upper limits
  28. GRB 070809: Swift detection of a short burst
  29. GRB 070808 : Faulkes Telescope South Observations
  30. GCN Swift XRT update position notices and enhanced position circulars
  31. GRB 070808: Swift XRT refined analysis
  32. GRB 070808: Xinglong TNT optical Upper Limit
  33. GRB070808: Optical observations with KANATA
  34. GRB070808 - SDSS Pre-Burst Observations
  35. GRB 070808: ROTSE-III Optical Limits
  36. GRB070805 XRT and UVOT afterglow candidate
  37. GRB070612A: Radio upper limit from GMRT
  38. Swift/UVOT observations of GRB070805
  39. UVOT observations of SAXJ1810.8-2609
  40. Swift detection of a outburst from SAX J1810.8-2609
  41. VLA non-detection of GRB 070721B
  42. GRB 070802: REM optical observations
  43. GRB 070802: Swift-XRT refined analysis
  44. GRB070802: Swift/UVOT upper limits
  45. GRB 070802: V-band detection of the candidate afterglow
  46. GRB 070802: GROND J band candidate
  47. Swift/UVOT detection of GRB070714B
  48. AGILE-ACS position for the SGR 1806-20 July 27 burst
  49. VLA upper limit on short hard burst GRB 070714B
  50. GRB070729: Swift/UVOT upper limits
  51. GRB 070729: Swift-XRT refined analysis
  52. GRB 070724B: P60 Observations
  53. GRB 070724B: Swift/UVOT Upper limits
  54. GRB 070721A: optical observations
  55. GRB 070724A: further VLT observations
  56. Four radio sources in Swift-XRT error box of GRB 070724
  57. GRB 070724: P60 and Gemini Observations
  58. GRB 060814 - Keck host detection and redshift
  59. Swift/UVOT refined analysis of GRB070724
  60. GRB 070724: Swift-XRT Team refined analysis
  61. GRB 070721B: further observations and analysis
  62. GRB 070724: Swift detection of a burst
  63. GRB 070714B: Keck observations
  64. Swift/UVOT Observations of GRB070721A
  65. GRB 070721B : Faulkes Telescope South observations
  66. GRB 070721A : Faulkes Telescope South optical limit
  67. GRB 070721A: Swift/XRT refined analysis
  68. GRB 070721A, Swift-BAT refined analysis
  69. GRB070721B: A bright UVOT candidate
  70. GRB070714B: TNG NIR observations
  71. GRB 070714A: Swift/UVOT Upper limits
  72. GRB 070714B: Swift/UVOT Upper Limits
  73. GRB 070714B: Swift-BAT spectral lag for the SHB
  74. GRB 070714B: confirmation of optical afterglow
  75. GRB 070616: No Evidence for I Band Afterglow
  76. GRB 070714A: Swift XRT refined analysis
  77. GRB070714B: Swift-XRT refined analysis
  78. GRB 070714 : Liverpool Telescope optical counterpart ?
  79. GRB 070714: Swift detection of a bright burst, possibly short
  80. GRB 070704: RTT150 optical observations
  81. GRB 070707: optical afterglow
  82. Swift/UVOT Observations of GRB070707
  83. Swift XRT observation of GRB 070707
  84. GRB 070707: VLT observations
  85. GRB 070707: A long GRB detected by INTEGRAL
  86. GRB 070707: A long GRB detected by INTEGRAL
  87. GRB 070429B: NIR Observations
  88. GRB070704: FAVOR optical observations
  89. GRB 070704 : Liverpool Telescope Observations
  90. GRB 070611: VLT observations
  91. VLA detection of GRB 070612A in C Band
  92. Konus-Wind observation of GRB 070626
  93. GRB 070704: Swift-XRT refined analysis
  94. Swift/UVOT Observations of GRB070704
  95. GRB 070704: Correction to GCN Circ 6594
  96. GRB 070704: Swift detection of a burst
  97. GRB 070626: Suzaku/WAM observation of the prompt emission
  98. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  99. GRB 070628 Swift-UVOT Refined Analysis
  100. GRB 070628: NIR detection of afterglow

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