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"

23416 results found.

  1. GRB 070808: ROTSE-III Optical Limits
  2. GRB 070808: Swift detection of a burst
  3. GRB061121A: PROMPT Observations
  4. GRB070805 XRT and UVOT afterglow candidate
  5. GRB070612A: Radio upper limit from GMRT
  6. Swift/UVOT observations of GRB070805
  7. GRB 070805: Swift detection of a burst
  8. UVOT observations of SAXJ1810.8-2609
  9. Swift detection of a outburst from SAX J1810.8-2609
  10. VLA non-detection of GRB 070721B
  11. GRB 070802: REM optical observations
  12. GRB 070802: Swift-XRT refined analysis
  13. GRB070802: Swift/UVOT upper limits
  14. GRB 070802, Swift-BAT refined analysis
  15. GRB 070802: V-band detection of the candidate afterglow
  16. GRB 070802: GROND J band candidate
  17. GRB 070802: Swift detection of a burst
  18. GRB 070731, Swift-BAT refined analysis
  19. Swift/UVOT detection of GRB070714B
  20. AGILE-ACS position for the SGR 1806-20 July 27 burst
  21. GRB 070729: LCO optical imaging
  22. VLA upper limit on short hard burst GRB 070714B
  23. GRB070729: Swift/UVOT upper limits
  24. GRB 070729: Magellan NIR Observations
  25. GRB 070724B: P60 Observations
  26. GRB 070729: Swift detection of a short hard burst
  27. GRB 070724B: Swift/UVOT Upper limits
  28. GRB 070724B: Swift-XRT afterglow likely candidate
  29. GRB 070721A: optical observations
  30. GRB 070724A: further VLT observations
  31. GRB 070724B: Analysis of AGILE gamma-ray data
  32. GRB 070724b: First Gamma Ray Burst Localization by SuperAGILE onboard
  33. Four radio sources in Swift-XRT error box of GRB 070724
  34. GRB 070724: P60 and Gemini Observations
  35. GRB 060814 - Keck host detection and redshift
  36. Swift/UVOT refined analysis of GRB070724
  37. GRB 070724: Swift-XRT Team refined analysis
  38. Short-Hard GRB070714B: PROMPT Observations
  39. GRB 070721B: further observations and analysis
  40. GRB 070724: Swift detection of a burst
  41. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  42. GRB 070714B: Keck observations
  43. Swift/UVOT Observations of GRB070721A
  44. GRB 070721B : Faulkes Telescope South observations
  45. GRB 070721A : Faulkes Telescope South optical limit
  46. GRB 070721A: Swift/XRT refined analysis
  47. GRB070721B: A bright UVOT candidate
  48. GRB 070721B: Swift detection of a burst
  49. GRB 070721: Swift detection of a possible burst
  50. GRB070714B: TNG NIR observations
  51. GRB 070714A: Swift/UVOT Upper limits
  52. GRB 070714B: Swift/UVOT Upper Limits
  53. GRB 070714B: confirmation of optical afterglow
  54. GRB 070616: No Evidence for I Band Afterglow
  55. GRB 070714A: Swift XRT refined analysis
  56. GRB070714B: Swift-XRT refined analysis
  57. GRB 070707: Swift-XRT follow-up observations
  58. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  59. GRB 070714 ("Bastille"): Optical Pre-Imaging
  60. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  61. GRB 070714 : Liverpool Telescope optical counterpart ?
  62. GRB 070714: Swift detection of a bright burst, possibly short
  63. GRB 070704: RTT150 optical observations
  64. GRB 070707: optical afterglow
  65. Swift/UVOT Observations of GRB070707
  66. Swift XRT observation of GRB 070707
  67. GRB 070707: VLT observations
  68. GRB070704: FAVOR optical observations
  69. GRB 070704 : Liverpool Telescope Observations
  70. GRB 070611: VLT observations
  71. VLA detection of GRB 070612A in C Band
  72. GRB 070704: Swift-XRT refined analysis
  73. Swift/UVOT Observations of GRB070704
  74. GRB 070704: Correction to GCN Circ 6594
  75. GRB 070704: Swift detection of a burst
  76. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  77. GRB 070628 Swift-UVOT Refined Analysis
  78. GRB 070628: NIR detection of afterglow
  79. GRB 070628: TAROT La Silla observatory optical observations
  80. GRB 070628: Swift XRT refined analysis
  81. GRB 070628: Swift detection of a possible burst
  82. GRB 070612A: Allen Telescope Array Observations
  83. OT20050728 was not an optical GRB afterglow
  84. INTEGRAL burst GRB070615: X-ray continued observations
  85. GRB 070616 : WIDGET simultaneous optical observations
  86. GRB070621: RTT150 optical observations
  87. GRB 070621: VLT optical observations
  88. GRB 070621: Swift/UVOT Upper Limits
  89. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  90. GRB 070621: Swift-BAT refined analysis
  91. GRB 070621: Gemini South optical imaging
  92. GRB 070621: UVOT-enhanced XRT position
  93. Observations of GRB070612A at Calar Alto
  94. GRB 070621: NOT observations
  95. GRB070621: OPTIMA-Burst optical upper limit
  96. GRB 070621: TAROT Calern observatory optical observations
  97. GRB 070621: Watcher Observations
  98. GRB 070621: ROTSE-III Prompt Optical Limits
  99. GRB 070621: Swift detection of a burst
  100. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz

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