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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"
  1. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  2. GRB 080130: Swift-BAT refined analysis
  3. GRB 080130: further Swift XRT observations confirm fading source
  4. GRB 080129: Swift/UVOT Refined Upper Limits
  5. Swift/UVOT observations of GRB080130
  6. GRB 080130: REM NIR observations
  7. GRB 080130(?): Swift XRT observation
  8. GRB 080130?: Detection of a possible burst by BATSS
  9. GRB 080129: Optical observations from OSN
  10. GRB 080129: Swift-XRT refined analysis
  11. X-ray transient in NGC 2770: RTT150 optical observations
  12. GRB 080129: KAIT optical limits
  13. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  14. GRB 080129: optical limit by Pi of the Sky
  15. GRB 080129, Swift-BAT refined analysis
  16. GRB 080129: TAROT La Silla observatory optical observations
  17. GRB 080129: Gemini-South photometry
  18. GRB 080129: GROND detection in all bands, and fading
  19. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  20. GRB 080129: Enhanced Swift-XRT position
  21. GRB 080129: Gemini-South Imaging Observations
  22. GRB 080129: Swift XRT position
  23. GRB 080129 (?): UVOT Upper Limits
  24. GRB 080129 (?): Swift detection of a possible burst
  25. A new website of high-level data products for Swift GRBs
  26. GRB 080121: Upper limit on X-ray afterglow
  27. GRB 080123 : Suzaku WAM observation of the prompt emission
  28. Swift trigger(=301779) is not a GRB
  29. Transient 080109/SN 2008D: Spectroscopic Evolution
  30. GRB 080122: pseudo-z= 1.93 from prompt emission spectrum
  31. Konus-Wind observation of GRB 080122
  32. GRB 080122 : Suzaku WAM observation of the prompt emission
  33. GRB 080121: Swift/UVOT upper limits
  34. SNe 2008D and 2007uy: Chandra Detections
  35. GRB 080121 position was incorrect
  36. GRB 080121: Enhanced Swift-XRT position
  37. Two non-burst Swift SubThreshold triggers
  38. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  39. IPN triangulation of GRB080122
  40. GRB 080121: Nearby SDSS galaxies
  41. GRB 080121: Swift-BAT detection of a very weak, short burst
  42. GRB 080123: Swift-XRT refined analysis
  43. GRB 080123: Swift/UVOT refined analysis
  44. X-ray transient in NGC 2770: RTT150 optical observations
  45. GRB 080123, Swift-BAT refined analysis
  46. GRB 080123: Enhanced Swift-XRT position
  47. GRB 080123: Swift detection of a short burst
  48. GRB 080120: GROND confirmation of the optical afterglow
  49. XRF 080109 / SN 2008D: GMRT radio observation at 1280 MHz
  50. VLA radio upper limit on GRB 080120
  51. GRB 080120: Swift-XRT refined analysis
  52. UVOT detection of GRB080120
  53. GRB 080120: GROND detection
  54. GRB 080120 : Planned XMM-Newton observation
  55. GRB080120: Swift XRT position
  56. GRB 080120: a long GRB detected by INTEGRAL
  57. XRF 080109 / SN 2008D: 1.4 GHz WSRT Radio Observations
  58. Transient in NGC2770 / SN2008D: Metallicity of nearby HII regions
  59. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  60. XRF 080109 / SN 2008D: WSRT Radio Detection
  61. Transient 080109/ SN 2008D, metallicity of the host galaxy
  62. Transient 080109/ SN 2008D, IR Spectrum
  63. XRF 080109 / SN 2008D: optical observations
  64. NGC 2770B has the same redshift as NGC 2770
  65. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  66. XRF 080109 / SN 2008D: spectroscopic evolution
  67. XRF 080109 / SN 2008D: UKIRT JHK imaging
  68. optical observations, XRT in NGC 2770
  69. XRF 080109/SN 2008D: PROMPT Optical Imaging
  70. Gemini-South observations of XRF 080109 / SN 2008D
  71. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  72. Discovery of Radio Emission from Transient in NGC 2770
  73. XRF 080109 in NGC2770: NIR observations at TNG
  74. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  75. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  76. XRF 080109 in NGC2770: Detectable Superluminal Motion
  77. Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
  78. XRF in NGC 2770: Search for X-ray periodicity
  79. Spectroscopic classification of SN 2008D (Transient in NGC 2770)
  80. Refined Swift-XRT analysis of the transient in NGC 2770
  81. Transient in NGC 2770: spectroscopic evidence for a SN
  82. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
  83. Opticall follow-ups for the X-ray transient in NGC 2770
  84. X-ray transient in NGC 2770: Optical observations with Astrotel-Caucasus
  85. Optical Spectroscopy of the Transient in NGC 2770
  86. Swift UVOT Observations of the X-ray transient in NGC 2770
  87. Early OT detection of XRF in NGC 2770 in Asiago frames
  88. Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
  89. Possible XRF in NGC 2770 - NOT observations of the optical counterpart
  90. Bright X-ray Transient (a XRF? ) in NGC 2770 - A SN optical counterpart?
  91. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  92. GRB 071227: Suzaku WAM observation of the prompt emission
  93. GRB 071227: optical afterglow
  94. Further Swift-BAT analysis of GRB 071227
  95. Konus-Wind observation of GRB 071227
  96. GRB 071227: Magellan redshift confirmation
  97. GRB 071227: Swift-XRT refined analysis
  98. GRB 071227: VLT probable redshift of the candidate host galaxy
  99. GRB 071227: Magellan observations
  100. GRB071227: Swift/UVOT refined analysis

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