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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"

12312 results found.

  1. GRB080506: Swift/UVOT observations
  2. GRB080503, RIMOTS optical upper limit
  3. GRB 080503: VLA radio upper limit
  4. GRB 080503: MITSuME Ishigakijima optical upper limits
  5. GRB080503: Swift/UVOT Upper Limits
  6. GRB 080503: MITSuME Akeno optical upper limits
  7. GRB 080503: Swift detection of a short burst
  8. VLA radio upper limit on GRB 080430
  9. GRB080426: Swift/UVOT upper limits
  10. GRB 080426: Swift detection of a possibly short burst
  11. Possible GRB 080315: XRT non-detection of afterglow
  12. GRB080319A: MAGIC telescope GeV observation
  13. GRB 080420?: Swift detection of a possible short burst
  14. Swift XRT and UVOT observations of GRB080414
  15. GRB 080319B: Jet Break, Energetics, Supernova
  16. GRB080413A: Swift/UVOT observations
  17. GRB080330: MAGIC telescope GeV observation
  18. Swift/UVOT observations of GRB080409
  19. UVOT/Swift Observations of GRB080408
  20. GRB 080409: Swift detection of a burst
  21. GRB 080325: optical upper limit
  22. GRB080328, RIMOTS optical upper limit
  23. GRB 080330 Swift-UVOT refined analysis
  24. GRB 080328: BTA optical imaging and spectroscopy
  25. Swift/UVOT observations of GRB080328
  26. GRB 080325: MITSuME Akeno optical upper limits
  27. GRB 080325: GROND Observations
  28. GRB 080325: Swift/UVOT Upper Limits
  29. GRB 080319D: GROND Detection of the Optical Counterpart
  30. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  31. GRB 080319B: optical upper limit
  32. GRB 080319D: optical upper limit
  33. GRB 080319C: UVOT Observations
  34. GRB 080319A: UVOT Observations
  35. GRB 080319B: Allen Telescope Array Observations
  36. GRB 080319B optical observations
  37. GRB 080320: Swift detection of a burst
  38. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  39. GRB 080319A: REM observations
  40. Swift/UVOT observations of GRB 080315
  41. Swift trigger 306323: Swift-BAT/XRT refined analysis
  42. GRB 080315: Swift detection of a possible burst
  43. GRB 080307: NIR upper limit
  44. GRB 080229: NIR upper limit
  45. GRB080307: optical upper limit
  46. GRB 080310: Swift/UVOT Refined Analysis
  47. GRB080229, optical upper limit (Correction)
  48. GRB080307, optical upper limit
  49. GRB080229, optical upper limit
  50. GRB 080307: Swift/UVOT Upper Limits
  51. GRB080307: Optical upper limits
  52. GRB 080303: Swift/UVOT follow-up of afterglow detection
  53. Swift UVOT observations of GRB080229B
  54. GRB080229: Possible optical afterglow
  55. UVOT analysis for GRB080229
  56. GRB 080229: Swift detection of a bright burst
  57. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  58. Swift-XRT improved positions, and new redshift limits.
  59. ESO optical and NIR observations of GRB 080218B
  60. Swift/UVOT observations of GRB080218B
  61. GRB 080218B: REM NIR early upper limits
  62. GRB 080218B: GROND upper limits
  63. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  64. VLA radio upper limit on GRB 080212
  65. Swift/UVOT refined analysis of GRB080212
  66. GRB 080212: REM NIR afterglow?
  67. GRB 080207: VLT NIR early upper limits
  68. GRB 080210: Swift/UVOT Refined Analysis
  69. GRB 080210: VLT redshift
  70. GRB 080210: GOND detection in all bands and redshift upper limit
  71. GRB 080207: GROND upper limits
  72. GRB 080207: Optical limits from Gemini-South
  73. Swift detection of AX J1749.1-2639
  74. GRB 080207: REM NIR observations
  75. GRB080207: Swift/UVOT refined analysis
  76. GRB 080207: Swift detection of a burst
  77. GRB 080205 optical upper limit
  78. VLA radio upper limit on GRB 080205
  79. GRB 080205: Swift/UVOT observations
  80. GRB 080205: Swift detection of a burst
  81. GRB 080129: Swift/UVOT Refined Upper Limits
  82. Swift/UVOT observations of GRB080130
  83. GRB 080129 (?): UVOT Upper Limits
  84. GRB 080121: Upper limit on X-ray afterglow
  85. Konus-Wind observation of GRB 080122
  86. GRB 080121: Swift/UVOT upper limits
  87. GRB 080123: Swift/UVOT refined analysis
  88. XRF 080109 / SN 2008D: GMRT radio observation at 1280 MHz
  89. VLA radio upper limit on GRB 080120
  90. UVOT detection of GRB080120
  91. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  92. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  93. Refined Swift-XRT analysis of the transient in NGC 2770
  94. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
  95. GRB071227: Swift/UVOT refined analysis
  96. GRB 071227: REM NIR and Optical observations
  97. GRB 071227: Swift detection of a burst
  98. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  99. GRB071122: Swift/UVOT Observations
  100. GRB 071122: Swift detection of a burst

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