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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"

2626 results found.

  1. GRB 081003A: Swift-XRT Team position and analysis
  2. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  3. GRB080928: Gemini-South Absorption Redshift
  4. Swift detection of a possible GRB (trigger 325707)
  5. GRB 080916C: Swift/XRT detection of possible afterglow
  6. GRB 080916B: Swift UVOT Refined Analysis
  7. GRB 080905B: Refined UVOT Analysis
  8. GRB 080906: Swift detection of a burst with optical afterglow
  9. GRB 080905B: Swift detection of a burst with possible optical counterpart
  10. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  11. SGR 0501+4516: Detection of possible optical counterpart
  12. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  13. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  14. Swift trigger 322590: BAT detection of a possible burst
  15. Enhanced Swift-XRT position of SGR 0501+4516
  16. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  17. SGR 0501+4516: Swift XRT measure of the spin period
  18. SGR 0501+4516: Astrotel-Caucasus optical observations
  19. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  20. GRB 080822 (SGR 0501+4516): archival optical observations
  21. GRB 080810: KANATA optical-NIR observation, update
  22. GRB080804: Gemini South redshift confirmation
  23. GRB 080805: GROND detection of possible afterglow
  24. GRB 080727A: Swift-XRT refined analysis
  25. Retraction of Swift Trigger 317393
  26. Trigger 317393: Swift detection of a possible GRB
  27. GRB 080710: TLS observations, steepening afterglow decay
  28. GRB 080707: possible break in the X-rays
  29. Trigger 315630: Swift detection of a possible burst
  30. GRB 080701: Swift detection of a burst
  31. Swift-BAT trigger 314975 possible burst
  32. GRB 070809: Putative host galaxy and redshift
  33. Swift observations of BAT Slew Survey event (Trigger=010)
  34. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  35. GRB 080604, Swift-BAT refined analysis
  36. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  37. GRB 080602: Swift detection of a burst
  38. GRB 080523, Swift-BAT refined analysis
  39. GRB 080523: Swift detection of a burst
  40. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  41. GRB 080515: Swift-XRT position and analysis
  42. GRB 080517, Swift-BAT refined analysis
  43. GRB 080517: Swift detection of a burst
  44. GRB 080514B: possible AGILE detection at E>50 MeV
  45. Swift detection of a possible galactic transient
  46. GRB 080507: E Pur Si Muove!
  47. GRB 080503: Hubble Space Telescope Imaging
  48. GRB 080507: Swift-XRT position of a possible afterglow
  49. GRB 080506: TLS 2nd Epoch - possible light curve break
  50. GRB 080506, Swift-BAT refined analysis
  51. GRB 080503: Late-time Optical rebrightening (possible mini-SN) - correction
  52. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  53. GRB 080503: New candidate afterglow/host in Gemini imaging
  54. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  55. GRB 080430: Swift detection of a burst with optical afterglow
  56. GRB080426: Observations from CAHA
  57. Possible GRB 080315: XRT non-detection of afterglow
  58. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  59. GRB 080420?: Swift detection of a possible short burst
  60. GRB 080413A: Suzaku WAM observation of the prompt emission
  61. Swift-BAT spectral lag analysis of GRB 080413B
  62. GRB 080413: Swift detection of a burst with an optical afterglow
  63. GRB 080408: Swift-XRT position of a possible afterglow
  64. GRB 080409: Swift detection of a burst
  65. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  66. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  67. GRB 080330: REM optical observations
  68. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  69. GRB080319B: optical observations
  70. GRB 080325: Swift detection of a burst
  71. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  72. GRB 080320, Swift-BAT refined analysis
  73. GRB080319B: Time-Independent XRT Spectrum
  74. GRB 080319B: Swift-XRT Team Refined Analysis
  75. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  76. GRB080319B Liverpool Telescope optical afterglow candidate
  77. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  78. GRB 080319A: Swift detection of a burst
  79. Swift trigger 306323: Swift-BAT/XRT refined analysis
  80. GRB 080315: Swift detection of a possible burst
  81. GRB 080310, Swift-BAT refined analysis
  82. GRB 080310: Swift detection of a burst with optical afterglow
  83. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  84. GRB 080307, Swift-BAT refined analysis
  85. GRB 080307, Preliminary Swift-BAT refined analysis
  86. GRB 080307: Swift detection of a burst
  87. VLA possible radio detection of GRB 080229
  88. GRB080229: Possible optical afterglow
  89. GRB 080212: REM refined analysis
  90. GRB 080210: GOND detection in all bands and redshift upper limit
  91. GRB 080130: further Swift XRT observations confirm fading source
  92. Swift/UVOT observations of GRB080130
  93. GRB 080130(?): Swift XRT observation
  94. GRB 080130?: Detection of a possible burst by BATSS
  95. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  96. GRB 080129: Gemini-South photometry
  97. GRB 080129: Swift XRT position
  98. GRB 080129 (?): UVOT Upper Limits
  99. GRB 080129 (?): Swift detection of a possible burst
  100. IPN triangulation of GRB080122

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