Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

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"

12318 results found.

  1. GRB 080516: Swift-XRT Team refined analysis
  2. Errartum: VLA upper limit on GRB 080507
  3. VLA upper limit on GRB 080705
  4. Konus-Wind observation of GRB 080513
  5. Swift detection of a possible galactic transient
  6. GRB 080506: VLA radio upper limit
  7. GRB080506: Swift/UVOT observations
  8. GRB080503, RIMOTS optical upper limit
  9. GRB 080503: VLA radio upper limit
  10. GRB 080503: MITSuME Ishigakijima optical upper limits
  11. GRB080503: Swift/UVOT Upper Limits
  12. GRB 080503: MITSuME Akeno optical upper limits
  13. GRB 080503: Swift detection of a short burst
  14. VLA radio upper limit on GRB 080430
  15. GRB080426: Swift/UVOT upper limits
  16. GRB 080426: Swift detection of a possibly short burst
  17. Possible GRB 080315: XRT non-detection of afterglow
  18. GRB080319A: MAGIC telescope GeV observation
  19. GRB 080420?: Swift detection of a possible short burst
  20. Swift XRT and UVOT observations of GRB080414
  21. GRB 080319B: Jet Break, Energetics, Supernova
  22. GRB080413A: Swift/UVOT observations
  23. GRB080330: MAGIC telescope GeV observation
  24. Swift/UVOT observations of GRB080409
  25. UVOT/Swift Observations of GRB080408
  26. GRB 080409: Swift detection of a burst
  27. GRB 080325: optical upper limit
  28. GRB080328, RIMOTS optical upper limit
  29. GRB 080330 Swift-UVOT refined analysis
  30. GRB 080328: BTA optical imaging and spectroscopy
  31. Swift/UVOT observations of GRB080328
  32. GRB 080325: MITSuME Akeno optical upper limits
  33. GRB 080325: GROND Observations
  34. GRB 080325: Swift/UVOT Upper Limits
  35. GRB 080319D: GROND Detection of the Optical Counterpart
  36. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  37. GRB 080319B: optical upper limit
  38. GRB 080319D: optical upper limit
  39. GRB 080319C: UVOT Observations
  40. GRB 080319A: UVOT Observations
  41. GRB 080319B: Allen Telescope Array Observations
  42. GRB 080319B optical observations
  43. GRB 080320: Swift detection of a burst
  44. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  45. GRB 080319A: REM observations
  46. Swift/UVOT observations of GRB 080315
  47. Swift trigger 306323: Swift-BAT/XRT refined analysis
  48. GRB 080315: Swift detection of a possible burst
  49. GRB 080307: NIR upper limit
  50. GRB 080229: NIR upper limit
  51. GRB080307: optical upper limit
  52. GRB 080310: Swift/UVOT Refined Analysis
  53. GRB080229, optical upper limit (Correction)
  54. GRB080307, optical upper limit
  55. GRB080229, optical upper limit
  56. GRB 080307: Swift/UVOT Upper Limits
  57. GRB080307: Optical upper limits
  58. GRB 080303: Swift/UVOT follow-up of afterglow detection
  59. Swift UVOT observations of GRB080229B
  60. GRB080229: Possible optical afterglow
  61. UVOT analysis for GRB080229
  62. GRB 080229: Swift detection of a bright burst
  63. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  64. Swift-XRT improved positions, and new redshift limits.
  65. ESO optical and NIR observations of GRB 080218B
  66. Swift/UVOT observations of GRB080218B
  67. GRB 080218B: REM NIR early upper limits
  68. GRB 080218B: GROND upper limits
  69. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  70. VLA radio upper limit on GRB 080212
  71. Swift/UVOT refined analysis of GRB080212
  72. GRB 080212: REM NIR afterglow?
  73. GRB 080207: VLT NIR early upper limits
  74. GRB 080210: Swift/UVOT Refined Analysis
  75. GRB 080210: VLT redshift
  76. GRB 080210: GOND detection in all bands and redshift upper limit
  77. GRB 080207: GROND upper limits
  78. GRB 080207: Optical limits from Gemini-South
  79. Swift detection of AX J1749.1-2639
  80. GRB 080207: REM NIR observations
  81. GRB080207: Swift/UVOT refined analysis
  82. GRB 080207: Swift detection of a burst
  83. GRB 080205 optical upper limit
  84. VLA radio upper limit on GRB 080205
  85. GRB 080205: Swift/UVOT observations
  86. GRB 080205: Swift detection of a burst
  87. GRB 080129: Swift/UVOT Refined Upper Limits
  88. Swift/UVOT observations of GRB080130
  89. GRB 080129 (?): UVOT Upper Limits
  90. GRB 080121: Upper limit on X-ray afterglow
  91. Konus-Wind observation of GRB 080122
  92. GRB 080121: Swift/UVOT upper limits
  93. GRB 080123: Swift/UVOT refined analysis
  94. XRF 080109 / SN 2008D: GMRT radio observation at 1280 MHz
  95. VLA radio upper limit on GRB 080120
  96. UVOT detection of GRB080120
  97. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  98. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  99. Refined Swift-XRT analysis of the transient in NGC 2770
  100. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov