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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"

19543 results found.

  1. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  2. GRB 070809: The Swift evidence for the SHB nature of this burst
  3. GRB 070913: SMARTS optical/IR observations
  4. GRB 070913: TAROT La Silla observatory optical observations
  5. GRB 070911: PAIRITEL IR Observations
  6. GRB 070809: Confirmation of optical transient
  7. Candidate Orphan GRB Optical Transient in IC 4779
  8. Las Campanas observations of possible TAROT GRB transient near IC
  9. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  10. GRB 070824 - Combined SuperAGILE/IPN Localization
  11. Konus-Wind observation of very bright GRB 070821
  12. GRB 070731: Swift/UVOT Upper Limit
  13. GRB 070805: UVOT afterglow candidate retraction
  14. GRB 070810B : Faulkes Telescope South Observations
  15. GRB 070810A: Continued Keck Imaging
  16. GRB 070810B: Keck spectroscopy of possible host galaxies
  17. GRB070810B: Swift/UVOT Upper Limits
  18. GRB 070810B, Swift-BAT refined analysis
  19. GRB 070810B: Xinglong TNT optical Upper Limit
  20. GRB070810B: Optical observations with KANATA
  21. GRB 070809: Swift/UVOT Upper Limits
  22. GRB 070810B: Swift detection of a short burst
  23. VLA upper limit on the short hard burst GRB 070729
  24. No radio detection in superAGILE burst 070724B
  25. GRB 070809: Keck Imaging
  26. GRB 070810: enhanced Swift-XRT position
  27. GRB 070810: Swift/UVOT Optical Counterpart
  28. GRB 070810: Swift detection of a burst
  29. GRB 070809: Optical Pre-imaging from Palomar
  30. GRB 070808: Swift/UVOT upper limits
  31. GRB 070809: Swift detection of a short burst
  32. GRB 070808 : Faulkes Telescope South Observations
  33. GCN Swift XRT update position notices and enhanced position circulars
  34. GRB 070808: Swift XRT refined analysis
  35. GRB 070808: Xinglong TNT optical Upper Limit
  36. GRB070808: Optical observations with KANATA
  37. GRB070808 - SDSS Pre-Burst Observations
  38. GRB 070808: ROTSE-III Optical Limits
  39. GRB070805 XRT and UVOT afterglow candidate
  40. GRB070612A: Radio upper limit from GMRT
  41. Swift/UVOT observations of GRB070805
  42. GRB 070805: Swift/UVOT initial analysis
  43. UVOT observations of SAXJ1810.8-2609
  44. Swift detection of a outburst from SAX J1810.8-2609
  45. VLA non-detection of GRB 070721B
  46. GRB 070802: REM optical observations
  47. GRB 070802: Swift-XRT refined analysis
  48. GRB070802: Swift/UVOT upper limits
  49. GRB 070802: V-band detection of the candidate afterglow
  50. GRB 070802: GROND J band candidate
  51. GRB 070802: Swift detection of a burst
  52. Swift/UVOT detection of GRB070714B
  53. VLA upper limit on short hard burst GRB 070714B
  54. GRB070729: Swift/UVOT upper limits
  55. GRB 070724B: P60 Observations
  56. GRB 070724B: Swift/UVOT Upper limits
  57. GRB 070721A: optical observations
  58. GRB 070724A: further VLT observations
  59. Four radio sources in Swift-XRT error box of GRB 070724
  60. GRB 070724: P60 and Gemini Observations
  61. GRB 060814 - Keck host detection and redshift
  62. Swift/UVOT refined analysis of GRB070724
  63. GRB 070724: Swift-XRT Team refined analysis
  64. GRB 070721B: further observations and analysis
  65. GRB 070724: Swift detection of a burst
  66. GRB 070714B: Keck observations
  67. Swift/UVOT Observations of GRB070721A
  68. GRB 070721B : Faulkes Telescope South observations
  69. GRB 070721A : Faulkes Telescope South optical limit
  70. GRB 070721A: Swift/XRT refined analysis
  71. GRB 070721A, Swift-BAT refined analysis
  72. GRB070721B: A bright UVOT candidate
  73. GRB070714B: TNG NIR observations
  74. GRB 070714A: Swift/UVOT Upper limits
  75. GRB 070714B: Swift/UVOT Upper Limits
  76. GRB 070714B: confirmation of optical afterglow
  77. GRB 070616: No Evidence for I Band Afterglow
  78. GRB 070714A: Swift XRT refined analysis
  79. GRB070714B: Swift-XRT refined analysis
  80. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  81. GRB 070714 ("Bastille"): Optical Pre-Imaging
  82. GRB 070714 : Liverpool Telescope optical counterpart ?
  83. GRB 070714: Swift detection of a bright burst, possibly short
  84. GRB 070704: RTT150 optical observations
  85. GRB 070707: optical afterglow
  86. Swift/UVOT Observations of GRB070707
  87. Swift XRT observation of GRB 070707
  88. GRB 070707: VLT observations
  89. GRB070704: FAVOR optical observations
  90. GRB 070704 : Liverpool Telescope Observations
  91. GRB 070611: VLT observations
  92. VLA detection of GRB 070612A in C Band
  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 070628 Swift-UVOT Refined Analysis
  98. GRB 070628: NIR detection of afterglow
  99. GRB 070628: TAROT La Silla observatory optical observations
  100. GRB 070612A: Allen Telescope Array Observations

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