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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"

32724 results found.

  1. GRB 070913: Corrected BAT position
  2. GRB 070913: SMARTS optical/IR observations
  3. GRB 070911: PAIRITEL IR Observations
  4. GRB 070911: Swift XRT refined analysis
  5. GRB 070911, Swift-BAT refined analysis
  6. IPN search for a GRB associated with TAROT transient on August 31
  7. Intense burst from SGR 1806-20 detected on September 7
  8. GRB 070809: Confirmation of optical transient
  9. Observations of possible TAROT GRB transient near IC 4779
  10. GRB 070810b: Image Subtraction of Multiple Keck Observations
  11. Las Campanas observations of possible TAROT GRB transient near IC
  12. Konus-Wind observation of GRB 070824
  13. Konus-Wind observation of very bright GRB 070821
  14. GRB 070731: Swift/UVOT Upper Limit
  15. GRB 070805: UVOT afterglow candidate retraction
  16. GRB070810b: optical candidate
  17. GRB 070810A: ROTSE-III Refined Analysis
  18. GRB 061110A: redshift confirmed
  19. GRB 070810B : Faulkes Telescope South Observations
  20. GRB 070810A: Continued Keck Imaging
  21. GRB 070810B: Keck spectroscopy of possible host galaxies
  22. GRB070810B: Swift/UVOT Upper Limits
  23. GRB 070810B: XRT refined analysis
  24. GRB 070810B, Swift-BAT refined analysis
  25. GRB 070809: Swift/UVOT Corrected Photometry
  26. Swift Trigger 287421: False trigger due to star tracker loss
  27. GRB 070810A: Swift-BAT refined analysis
  28. GRB 070810B: Xinglong TNT optical Upper Limit
  29. GRB070810B: Optical observations with KANATA
  30. GRB 070809: Swift/UVOT Upper Limits
  31. VLA upper limit on the short hard burst GRB 070729
  32. GRB 070810: Keck redshift and photometry
  33. No radio detection in superAGILE burst 070724B
  34. GRB 070809: Keck Imaging
  35. GRB 070810: Swift-XRT Team Refined Analysis
  36. GRB 070809: Swift-XRT refined analysis
  37. GRB 070810: Swift/UVOT Optical Counterpart
  38. GRB 070809, Swift-BAT refined analysis
  39. GRB 070809: Optical Pre-imaging from Palomar
  40. GRB 070808: Swift/UVOT upper limits
  41. GRB 070809: ROTSE-III Optical Limits
  42. GRB 070808 : Faulkes Telescope South Observations
  43. GCN Swift XRT update position notices and enhanced position circulars
  44. GRB 070808: Swift XRT refined analysis
  45. GRB 070808, Swift-BAT refined analysis
  46. GRB 070808: OPTIMA-Burst optical upper limit
  47. GRB 070808: Xinglong TNT optical Upper Limit
  48. GRB070808: Optical observations with KANATA
  49. GRB 070808: ROTSE-III Optical Limits
  50. GRB061121A: PROMPT Observations
  51. GRB070805 XRT and UVOT afterglow candidate
  52. GRB070612A: Radio upper limit from GMRT
  53. GRB 070721B: correct afterglow position
  54. Swift/UVOT observations of GRB070805
  55. GRB 070805, Swift-BAT refined analysis
  56. GRB 070805: Swift XRT initial analysis.
  57. UVOT observations of SAXJ1810.8-2609
  58. VLA non-detection of GRB 070721B
  59. GRB 070802: REM optical observations
  60. GRB 070724B: Swift-XRT afterglow confirmation
  61. GRB 070802: Swift-XRT refined analysis
  62. GRB070802: Swift/UVOT upper limits
  63. GRB 070802: Confirmation of the optical afterglow
  64. GRB 070802, Swift-BAT refined analysis
  65. GRB 070802: VLT redshift
  66. GRB 070802: refined Swift XRT position
  67. GRB 070802: V-band detection of the candidate afterglow
  68. GRB 070802: LCO I-band candidate
  69. GRB 070802: GROND J band candidate
  70. GRB 070802: LCO optical observations
  71. GRB 070802: Swift detection of a burst
  72. Konus-A observation of GRB 070729
  73. Swift/UVOT detection of GRB070714B
  74. AGILE-ACS position for the SGR 1806-20 July 27 burst
  75. GRB 070729: LCO optical imaging
  76. VLA upper limit on short hard burst GRB 070714B
  77. Intense burst from SGR 1806-20 detected on July 27
  78. GRB070729: Swift/UVOT upper limits
  79. GRB 070729: Swift-XRT refined analysis
  80. GRB 070729, Swift-BAT refined analysis
  81. GRB 070729: Magellan NIR Observations
  82. GRB 070724B: P60 Observations
  83. GRB 070724B: Swift/UVOT Upper limits
  84. GRB070721A: Swift/UVOT Detection of a Weak Afterglow
  85. GRB 070724B: Swift-XRT afterglow likely candidate
  86. GRB 070721A: optical observations
  87. GRB 070724A: further VLT observations
  88. GRB 070724B: Suzaku WAM observation of the prompt emission
  89. Konus-Wind observation of GRB 070724B
  90. GRB 070724B: Analysis of AGILE gamma-ray data
  91. GRB 070724B: Swift-XRT afterglow candidates
  92. Four radio sources in Swift-XRT error box of GRB 070724
  93. GRB 070724: optical observations
  94. GRB070724: Host galaxy redshift
  95. GRB 070724: P60 and Gemini Observations
  96. GRB 060814 - Keck host detection and redshift
  97. GRB 070724: Closer association with DSS source
  98. Swift/UVOT refined analysis of GRB070724
  99. GRB 070724: Swift-XRT Team refined analysis
  100. GRB 070724: Pre-Imaging Shows a Source in the XRT Error Circle

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