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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"

43899 results found.

  1. GRB 080129: GROND detection in all bands, and fading
  2. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  3. GRB 080129: Gemini-South Imaging Observations
  4. GRB 080129: Swift XRT position
  5. GRB 080129 (?): UVOT Upper Limits
  6. GRB 080129 (?): Swift detection of a possible burst
  7. A new website of high-level data products for Swift GRBs
  8. GRB 080121: Upper limit on X-ray afterglow
  9. GRB 080123 : Suzaku WAM observation of the prompt emission
  10. Swift trigger(=301779) is not a GRB
  11. Transient 080109/SN 2008D: Spectroscopic Evolution
  12. GRB 080122: pseudo-z= 1.93 from prompt emission spectrum
  13. Konus-Wind observation of GRB 080122
  14. GRB 080122 : Suzaku WAM observation of the prompt emission
  15. GRB 080121: Swift/UVOT upper limits
  16. SNe 2008D and 2007uy: Chandra Detections
  17. GRB 080121 position was incorrect
  18. Two non-burst Swift SubThreshold triggers
  19. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  20. IPN triangulation of GRB080122
  21. GRB 080121: Nearby SDSS galaxies
  22. GRB 080121: Swift-BAT detection of a very weak, short burst
  23. GRB 080123: Swift-XRT refined analysis
  24. GRB 080123: Swift/UVOT refined analysis
  25. X-ray transient in NGC 2770: RTT150 optical observations
  26. GRB 080123, Swift-BAT refined analysis
  27. GRB 080123: Swift detection of a short burst
  28. GRB 080120: GROND confirmation of the optical afterglow
  29. XRF 080109 / SN 2008D: GMRT radio observation at 1280 MHz
  30. VLA radio upper limit on GRB 080120
  31. GRB 080120: Swift-XRT refined analysis
  32. UVOT detection of GRB080120
  33. GRB 080120: GROND detection
  34. GRB 080120 : Planned XMM-Newton observation
  35. GRB080120: Swift XRT position
  36. GRB 080120: a long GRB detected by INTEGRAL
  37. XRF 080109 / SN 2008D: 1.4 GHz WSRT Radio Observations
  38. Transient in NGC2770 / SN2008D: Metallicity of nearby HII regions
  39. XRF 080109 / SN 2008D: WSRT Radio Detection
  40. Transient 080109/ SN 2008D, metallicity of the host galaxy
  41. Transient 080109/ SN 2008D, IR Spectrum
  42. XRF 080109 / SN 2008D: optical observations
  43. NGC 2770B has the same redshift as NGC 2770
  44. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  45. XRF 080109 / SN 2008D: spectroscopic evolution
  46. XRF 080109 / SN 2008D: UKIRT JHK imaging
  47. optical observations, XRT in NGC 2770
  48. XRF 080109/SN 2008D: PROMPT Optical Imaging
  49. Gemini-South observations of XRF 080109 / SN 2008D
  50. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  51. Discovery of Radio Emission from Transient in NGC 2770
  52. XRF 080109 in NGC2770: NIR observations at TNG
  53. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  54. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  55. XRF 080109 in NGC2770: Detectable Superluminal Motion
  56. Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
  57. XRF in NGC 2770: Search for X-ray periodicity
  58. Spectroscopic classification of SN 2008D (Transient in NGC 2770)
  59. Refined Swift-XRT analysis of the transient in NGC 2770
  60. Transient in NGC 2770: spectroscopic evidence for a SN
  61. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
  62. X-ray transient in NGC 2770: Optical observations with Astrotel-Caucasus
  63. Optical Spectroscopy of the Transient in NGC 2770
  64. Swift UVOT Observations of the X-ray transient in NGC 2770
  65. Early OT detection of XRF in NGC 2770 in Asiago frames
  66. Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
  67. Possible XRF in NGC 2770 - NOT observations of the optical counterpart
  68. Bright X-ray Transient (a XRF? ) in NGC 2770 - A SN optical counterpart?
  69. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  70. GRB 071227: Suzaku WAM observation of the prompt emission
  71. GRB 071227: optical afterglow
  72. Further Swift-BAT analysis of GRB 071227
  73. Konus-Wind observation of GRB 071227
  74. GRB 071227: Magellan redshift confirmation
  75. GRB 071227: Swift-XRT refined analysis
  76. GRB 071227: VLT probable redshift of the candidate host galaxy
  77. GRB 071227: Magellan observations
  78. GRB071227: Swift/UVOT refined analysis
  79. GRB 071227: REM NIR and Optical observations
  80. Swift-BAT refined analysis of short GRB 071227
  81. GRB 071227: Swift detection of a burst
  82. GRB071020: optical observations
  83. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  84. Swift-BAT trigger 298308 is not a GRB
  85. GRB 071208?: Swift detection of a possible burst
  86. IBAS Alert #4772 in not a GRB
  87. GRB 071125: Suzaku WAM observation of the prompt emission
  88. GRB 070429B: Probable host galaxy and redshift
  89. GRB 071129, Swift-BAT refined analysis
  90. GRB 071129: Swift detection of a burst
  91. Konus-Wind and Konus-A observations of GRB 071125
  92. IPN triangulation of very bright GRB 071125
  93. Disregard the "GRB 071126" position
  94. VLA radio detection of GRB 071122
  95. GRB071122: Swift/UVOT Observations
  96. GRB071104: NIR Afterglow Candidate at TNG
  97. GRB 071122: MASTER optical observation
  98. GRB 071122, Swift-BAT refined analysis
  99. GRB 071122 Swift-XRT refined analysis
  100. GRB071122: Gemini Absorption redshift

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