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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"

2744 results found.

  1. Swift-BAT refined analysis of trigger 334129
  2. GRB 081109A: Possible Swift-UVOT detection
  3. GRB 081109A: Faulkes Telescope South observations
  4. GRB 081109A: Swift-XRT refined analysis
  5. Swift-BAT Trigger 334129: possible burst
  6. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  7. GRB 081024B: new Swift-XRT observations
  8. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  9. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  10. GRB 081025: TLS upper limits
  11. GRB 081024B: Swift-XRT further observations
  12. GRB 081025: Swift-XRT position
  13. GRB 081024B: Swift-XRT observations
  14. GRB 081024: Swift-XRT refined analysis
  15. Swift detection of a possible burst (trigger 332287)
  16. GRB 081011: Swift XRT refined analysis
  17. GRB 081016: Swift-XRT candidate afterglow detection
  18. GRB 081007 and GRB 081007B: Fermi GBM detection
  19. GRB 081003A: Swift-XRT Team position and analysis
  20. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  21. GRB080928: Gemini-South Absorption Redshift
  22. Swift detection of a possible GRB (trigger 325707)
  23. GRB 080916C: Swift/XRT detection of possible afterglow
  24. GRB 080916B: Swift UVOT Refined Analysis
  25. GRB 080905B: Refined UVOT Analysis
  26. GRB 080906: Swift detection of a burst with optical afterglow
  27. GRB 080905B: Swift detection of a burst with possible optical counterpart
  28. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  29. SGR 0501+4516: Detection of possible optical counterpart
  30. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  31. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  32. Swift trigger 322590: BAT detection of a possible burst
  33. Enhanced Swift-XRT position of SGR 0501+4516
  34. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  35. SGR 0501+4516: Swift XRT measure of the spin period
  36. SGR 0501+4516: Astrotel-Caucasus optical observations
  37. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  38. GRB 080822 (SGR 0501+4516): archival optical observations
  39. GRB 080810: KANATA optical-NIR observation, update
  40. GRB080804: Gemini South redshift confirmation
  41. GRB 080805: GROND detection of possible afterglow
  42. GRB 080727A: Swift-XRT refined analysis
  43. Retraction of Swift Trigger 317393
  44. Trigger 317393: Swift detection of a possible GRB
  45. GRB 080710: TLS observations, steepening afterglow decay
  46. GRB 080707: possible break in the X-rays
  47. Trigger 315630: Swift detection of a possible burst
  48. GRB 080701: Swift detection of a burst
  49. Swift-BAT trigger 314975 possible burst
  50. GRB 070809: Putative host galaxy and redshift
  51. Swift observations of BAT Slew Survey event (Trigger=010)
  52. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  53. GRB 080604, Swift-BAT refined analysis
  54. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  55. GRB 080602: Swift detection of a burst
  56. GRB 080523, Swift-BAT refined analysis
  57. GRB 080523: Swift detection of a burst
  58. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  59. GRB 080515: Swift-XRT position and analysis
  60. GRB 080517, Swift-BAT refined analysis
  61. GRB 080517: Swift detection of a burst
  62. GRB 080514B: possible AGILE detection at E>50 MeV
  63. Swift detection of a possible galactic transient
  64. GRB 080507: E Pur Si Muove!
  65. GRB 080503: Hubble Space Telescope Imaging
  66. GRB 080507: Swift-XRT position of a possible afterglow
  67. GRB 080506: TLS 2nd Epoch - possible light curve break
  68. GRB 080506, Swift-BAT refined analysis
  69. GRB 080503: Late-time Optical rebrightening (possible mini-SN) - correction
  70. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  71. GRB 080503: New candidate afterglow/host in Gemini imaging
  72. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  73. GRB 080430: Swift detection of a burst with optical afterglow
  74. GRB080426: Observations from CAHA
  75. Possible GRB 080315: XRT non-detection of afterglow
  76. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  77. GRB 080420?: Swift detection of a possible short burst
  78. GRB 080413A: Suzaku WAM observation of the prompt emission
  79. Swift-BAT spectral lag analysis of GRB 080413B
  80. GRB 080413: Swift detection of a burst with an optical afterglow
  81. GRB 080408: Swift-XRT position of a possible afterglow
  82. GRB 080409: Swift detection of a burst
  83. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  84. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  85. GRB 080330: REM optical observations
  86. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  87. GRB080319B: optical observations
  88. GRB 080325: Swift detection of a burst
  89. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  90. GRB 080320, Swift-BAT refined analysis
  91. GRB080319B: Time-Independent XRT Spectrum
  92. GRB 080319B: Swift-XRT Team Refined Analysis
  93. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  94. GRB080319B Liverpool Telescope optical afterglow candidate
  95. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  96. GRB 080319A: Swift detection of a burst
  97. Swift trigger 306323: Swift-BAT/XRT refined analysis
  98. GRB 080315: Swift detection of a possible burst
  99. GRB 080310, Swift-BAT refined analysis
  100. GRB 080310: Swift detection of a burst with optical afterglow

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