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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"

42898 results found.

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

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