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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"

38608 results found.

  1. GRB 080121: Swift/UVOT upper limits
  2. SNe 2008D and 2007uy: Chandra Detections
  3. GRB 080121: Enhanced Swift-XRT position
  4. Two non-burst Swift SubThreshold triggers
  5. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  6. IPN triangulation of GRB080122
  7. GRB 080121: Swift-BAT detection of a very weak, short burst
  8. GRB 080123: Swift-XRT refined analysis
  9. GRB 080123: Swift/UVOT refined analysis
  10. GRB 080123: Enhanced Swift-XRT position
  11. GRB 080123: Swift detection of a short burst
  12. GRB 080120: GROND confirmation of the optical afterglow
  13. XRF 080109 / SN 2008D: GMRT radio observation at 1280 MHz
  14. VLA radio upper limit on GRB 080120
  15. GRB 080120: Swift-XRT refined analysis
  16. UVOT detection of GRB080120
  17. GRB 080120 : Planned XMM-Newton observation
  18. GRB080120: Swift XRT position
  19. GRB 080120: a long GRB detected by INTEGRAL
  20. XRF 080109 / SN 2008D: 1.4 GHz WSRT Radio Observations
  21. Transient in NGC2770 / SN2008D: Metallicity of nearby HII regions
  22. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  23. XRF 080109 / SN 2008D: WSRT Radio Detection
  24. Transient 080109/ SN 2008D, metallicity of the host galaxy
  25. XRF 080109 / SN 2008D: optical observations
  26. NGC 2770B has the same redshift as NGC 2770
  27. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  28. XRF 080109 / SN 2008D: spectroscopic evolution
  29. XRF 080109 / SN 2008D: UKIRT JHK imaging
  30. optical observations, XRT in NGC 2770
  31. XRF 080109/SN 2008D: PROMPT Optical Imaging
  32. Gemini-South observations of XRF 080109 / SN 2008D
  33. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  34. Discovery of Radio Emission from Transient in NGC 2770
  35. XRF 080109 in NGC2770: NIR observations at TNG
  36. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  37. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  38. Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
  39. XRF in NGC 2770: Search for X-ray periodicity
  40. Spectroscopic classification of SN 2008D (Transient in NGC 2770)
  41. Refined Swift-XRT analysis of the transient in NGC 2770
  42. Transient in NGC 2770: spectroscopic evidence for a SN
  43. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
  44. Opticall follow-ups for the X-ray transient in NGC 2770
  45. X-ray transient in NGC 2770: Optical observations with Astrotel-Caucasus
  46. Optical Spectroscopy of the Transient in NGC 2770
  47. Swift UVOT Observations of the X-ray transient in NGC 2770
  48. Early OT detection of XRF in NGC 2770 in Asiago frames
  49. Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
  50. Possible XRF in NGC 2770 - NOT observations of the optical counterpart
  51. Bright X-ray Transient (a XRF? ) in NGC 2770 - A SN optical counterpart?
  52. GRB 071227: Suzaku WAM observation of the prompt emission
  53. GRB 071227: optical afterglow
  54. Further Swift-BAT analysis of GRB 071227
  55. Konus-Wind observation of GRB 071227
  56. GRB 071227: Magellan redshift confirmation
  57. GRB 071227: Swift-XRT refined analysis
  58. GRB 071227: VLT probable redshift of the candidate host galaxy
  59. GRB 071227: Magellan observations
  60. GRB071227: Swift/UVOT refined analysis
  61. GRB 071227: REM NIR and Optical observations
  62. Swift-BAT refined analysis of short GRB 071227
  63. GRB 071227: Swift detection of a burst
  64. GRB071020: optical observations
  65. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  66. Swift-BAT trigger 298308 is not a GRB
  67. GRB 071208?: Swift detection of a possible burst
  68. IBAS Alert #4772 in not a GRB
  69. GRB 071125: Suzaku WAM observation of the prompt emission
  70. GRB 070429B: Probable host galaxy and redshift
  71. GRB 071129, Swift-BAT refined analysis
  72. GRB 071129: Swift detection of a burst
  73. Konus-Wind and Konus-A observations of GRB 071125
  74. IPN triangulation of very bright GRB 071125
  75. Disregard the "GRB 071126" position
  76. GRB 071126: Enhanced Swift-XRT position
  77. VLA radio detection of GRB 071122
  78. GRB071122: Swift/UVOT Observations
  79. GRB071104: NIR Afterglow Candidate at TNG
  80. GRB 071122: MASTER optical observation
  81. GRB 071122 Swift-XRT refined analysis
  82. GRB071122: Gemini Absorption redshift
  83. GRB 071122: P60 Optical Afterglow Candidate
  84. GRB 071122: ROTSE-III Optical Limits
  85. GRB 071122: Swift detection of a burst
  86. GRB 071118: P60 Observations
  87. GRB071118 MITSuME OAO optical observation
  88. GRB 071118: Observations from OSN
  89. GRB 071117: VLT observations and probable redshift
  90. Swift/UVOT observations of GRB071118
  91. GRB 071117: Swift-XRT revised position
  92. Konus-Wind and Konus-A observations of GRB 071117
  93. Swift XRT follow-up observations of GRB071008
  94. Swift/UVOT upper limits for GRB 071117
  95. GRB071118: Swift XRT refined analysis
  96. GRB 071117: Gemini Optical Afterglow Discovery
  97. GRB 071118, Swift-BAT refined analysis
  98. GRB 071112B: Gemini Image Differencing
  99. GRB 071118: Swift detection of a burst
  100. GRB 071117: Gemini Observations

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