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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"

6667 results found.

  1. GRB 070917: R band observations
  2. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  3. GRB 070911: PAIRITEL IR Observations
  4. GRB 070911: Swift XRT refined analysis
  5. GRB 070731: Swift/UVOT Upper Limit
  6. IPN Localization of GRB 070821 (long, very bright)
  7. GRB 070810B: XRT refined analysis
  8. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  9. GRB 070810: Swift-XRT Team Refined Analysis
  10. GRB 070809: Swift-XRT refined analysis
  11. GRB 070805: Swift XRT initial analysis.
  12. GRB 070724B: Swift-XRT afterglow confirmation
  13. GRB 070802: Swift-XRT refined analysis
  14. GRB 070802: GROND J band candidate
  15. GRB 070729: Swift-XRT refined analysis
  16. GRB 070729: Magellan NIR Observations
  17. GRB 070724: P60 and Gemini Observations
  18. GRB 070724: Swift-XRT Team refined analysis
  19. GRB 070721A: Swift/XRT refined analysis
  20. GRB 070616: No Evidence for I Band Afterglow
  21. GRB 070714A: Swift XRT refined analysis
  22. GRB070714B: Swift-XRT refined analysis
  23. GRB 070707: Swift-XRT follow-up observations
  24. Swift XRT observation of GRB 070707
  25. GRB 070628: Swift XRT refined analysis
  26. GRB070621: Swift XRT refined analysis
  27. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  28. GRB 070616: Swift XRT refined circular
  29. SWIFT J195509.6+261406 (GRB 070610): further observations
  30. GRB 070612B: Swift-XRT refined analysis
  31. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  32. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  33. GRB 070610: Swift-XRT refined analysis
  34. GRB 070611: Swift-XRT refined analysis
  35. GRB 070611; Swift-XRT position
  36. GRB 070610; Swift-XRT position
  37. GRB 070529: Swift-XRT refined analysis
  38. GRB 070521: Swift-XRT refined analysis
  39. GRB 070521: Keck imaging
  40. GRB070521: Gemini Observations
  41. GROND upper limits of GRB 070521
  42. GRB 070520B: Swift-XRT refined analysis
  43. GRB 070520A: Swift-XRT refined analysis
  44. GRB 070518: Swift-XRT refined analysis
  45. RHESSI Spectrum of GRB070508
  46. GRB 070508: Swift-XRT refined analysis
  47. GRB070412: MAGIC telescope GeV observation
  48. GRB 070429A: Swift XRT further analysis
  49. GRB 070420: Swift XRT refined analysis
  50. GBR 070419A: Swift/XRT refined analysis
  51. GRB 070419B: Swift XRT refined analysis
  52. GRB 070419A: Optical and IR observations with KANATA
  53. GRB 070418: Optical and IR observations with KANATA
  54. GRB 070406: Swift XRT refined analysis
  55. GRB 070411: Swift-XRT refined analysis
  56. GRB 070406: Swift XRT team further analysis
  57. Suzaku ToO observation of SGR 1806-20
  58. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  59. GRB 070406: Gemini South Imaging and XRT analysis
  60. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  61. GRB 070406: SARA upper limit
  62. GRB 070330: Swift-XRT refined analysis
  63. Konus-Wind observation of GRB 070328
  64. GRB 070328: Swift/XRT Refined Analysis
  65. GRB070208: optical observations
  66. GRB 070318: Gemini + Magellan spectra
  67. GRB070318: Swift-XRT refined analysis
  68. GRB 070311: Swift-XRT refined analysis
  69. GRB 070125: Chandra X-ray Confirmation of Jet Break
  70. GRB 070125: X-ray light curve analysis
  71. GRB 070306: XRT Team Refined Analysis
  72. GRB 070306: Optical and IR observations with KANATA
  73. GRB070224: Swift-XRT Refined Analysis
  74. GRB 070223: Optical-IR observation with KANATA
  75. GRB 070223: Swift-XRT Refined Analysis
  76. Konus-Wind and Konus-A observations of GRB 070220
  77. GRB 070209: Swift XRT refined analysis
  78. GRB 070219: XRT Refined Analysis
  79. GRB 070219: Liverpool Telescope Observations
  80. GRB 070125 observations with the GMRT
  81. GRB 070209: Swift XRT analysis
  82. GRB070208: optical observations
  83. IPN localization of very intense short GRB 070201
  84. GRB 070208: Swift XRT refined analysis
  85. GRB 070208: RAPTOR detection of early afterglow onset
  86. GRB 070208: Early IR detection and afterglow astrometry
  87. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  88. GRB061217: MAGIC telescope GeV observation
  89. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  90. GRB070124: Swift-XRT Observation
  91. GRB070125: Swift-XRT Refined Analysis
  92. RHESSI Spectrum of GRB070125
  93. GRB 070110: Ep,i - Eiso correlation
  94. GRB 070110 declared a "Burst of Interest" by Swift team
  95. GRB070110: Swift XRT Team refined analysis
  96. GRB070107: Swift/XRT refined analysis
  97. GRB070103: Swift XRT refined analysis
  98. GRB061222a: optical observations
  99. GRB 061210: Swift/XRT Astrometry Correction
  100. GRB 061222A: Confirmation of Gemini Afterglow Candidate

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