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"

32508 results found.

  1. GRB 070721: Swift detection of a possible burst
  2. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  3. GRB 070714B : Suzaku WAM observation of the prompt emission
  4. GRB070714B: TNG NIR observations
  5. Erratum : Suzaku WAM observation of GRB 070704
  6. GRB 070714A: Swift/UVOT Upper limits
  7. GRB 070714B: Swift/UVOT Upper Limits
  8. GRB 070616: No Evidence for I Band Afterglow
  9. GRB 070714A: Swift XRT refined analysis
  10. GRB070714B: Swift-XRT refined analysis
  11. GRB 070707: Swift-XRT follow-up observations
  12. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  13. GRB 070714 ("Bastille"): Optical Pre-Imaging
  14. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  15. GRB 070714A, Swift-BAT refined analysis
  16. GRB 070714 : Liverpool Telescope optical counterpart ?
  17. GRB 070704: RTT150 optical observations
  18. GRB 070704: Suzaku/WAM observation of the prompt emission
  19. Konus-Wind observation of GRB 070707
  20. GRB 070707: optical afterglow
  21. GRB 070707: object inside XRT error circle
  22. Swift/UVOT Observations of GRB070707
  23. Swift XRT observation of GRB 070707
  24. GRB 070707: VLT observations
  25. GRB 070429B: NIR Observations
  26. GRB070704: FAVOR optical observations
  27. GRB 070704 : Liverpool Telescope Observations
  28. GRB 070611: VLT observations
  29. VLA detection of GRB 070612A in C Band
  30. Konus-Wind observation of GRB 070626
  31. GRB 070704: Swift-XRT refined analysis
  32. Swift/UVOT Observations of GRB070704
  33. GRB 070704, Swift-BAT refined analysis
  34. GRB 070704: Correction to GCN Circ 6594
  35. GRB 070626: Suzaku/WAM observation of the prompt emission
  36. GRB 070628 Swift-UVOT Refined Analysis
  37. GRB 070628: NIR detection of afterglow
  38. GRB 070628, Swift-BAT refined analysis
  39. GRB 070628: TAROT La Silla observatory optical observations
  40. GRB 070628: Swift XRT refined analysis
  41. GRB 070628: Watcher Observations
  42. GRB 070612A: Allen Telescope Array Observations
  43. INTEGRAL burst GRB070615: X-ray continued observations
  44. GRB 070616 : WIDGET simultaneous optical observations
  45. GRB 070616: Suzaku/WAM observation of the prompt emission
  46. GRB 070612A: Second Epoch WSRT Radio Observations
  47. GRB070621: RTT150 optical observations
  48. GRB 070621: VLT optical observations
  49. GRB 070621: Swift/UVOT Upper Limits
  50. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  51. GRB 070621: Swift-BAT refined analysis
  52. GRB070621: Swift XRT refined analysis
  53. GRB 070621: Gemini South optical imaging
  54. Observations of GRB070612A at Calar Alto
  55. GRB 070621: NOT observations
  56. GRB070621: OPTIMA-Burst optical upper limit
  57. GRB 070621: Watcher Observations
  58. GRB 070621: ROTSE-III Prompt Optical Limits
  59. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  60. GRB 070612A: TNG optical observations
  61. Swift/UVOT detection of GRB070616 optical afterglow.
  62. GRB070612A: Gemini Spectroscopic Redshift
  63. GRB 070612A: NOT observations
  64. GRB070616: Optical Observation by MITSuME Akeno
  65. GRB 070612B: Optical Observation by MITSuME Akeno
  66. GRB070616: Optical Observation by MITSuME Okayama
  67. GRB 070616, Swift-BAT further refined analysis
  68. GRB 070616: Swift XRT refined circular
  69. GRB 070612A: Possible WSRT Radio Detection
  70. Swift/UVOT observations of GRB070616
  71. GRB 070616: TLS observation
  72. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  73. GRB 070616, Swift-BAT partial refined analysis
  74. GRB 070612B: optical observations
  75. VLA upper limit on GRB 070610
  76. GRB 070615
  77. GRB 070612A: Super-LOTIS observations
  78. GRB 070612A: Rapid Decay
  79. GRB 070612A: Suzaku/WAM observation of the prompt emission
  80. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  81. GRB070612A: MITSuME Okayama Observation
  82. GRB 070612A: continued SARA observations
  83. GRB 070612A: spectral lag
  84. GRB 070611: Watcher Observations
  85. GRB 070612A: MDM Observations
  86. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  87. GRB 070612B: SARA upper limit
  88. GRB 070612B, Swift-BAT refined analysis
  89. GRB 070612A, Swift-BAT refined analysis
  90. GRB 070612B: Swift-XRT refined analysis
  91. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  92. GRB 070612B: Swift/UVOT upper limits
  93. GRB070612B: P60 Observations
  94. GRB 070612B: KAIT limits
  95. GRB 070612A: SARA detection of possible OT
  96. GRB 070612B: Swift XRT position from downlink data
  97. GRB 070610: MITSuME OAO optical upper limit
  98. GRB070612 - SDSS Pre-Burst Observations
  99. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  100. GRB 070610: SARA upper limit

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