Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

26424 results found.

  1. GRB 070714B: confirmation of optical afterglow
  2. GRB 070616: No Evidence for I Band Afterglow
  3. GRB 070714A: Swift XRT refined analysis
  4. GRB070714B: Swift-XRT refined analysis
  5. GRB 070707: Swift-XRT follow-up observations
  6. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  7. GRB 070714A, Swift-BAT refined analysis
  8. GRB 070714 : Liverpool Telescope optical counterpart ?
  9. GRB 070714: Swift detection of a bright burst, possibly short
  10. SN 2007bg - off-axis GRB?
  11. GRB 070704: RTT150 optical observations
  12. GRB 070704: Suzaku/WAM observation of the prompt emission
  13. Konus-Wind observation of GRB 070707
  14. GRB 070707: optical afterglow
  15. Swift/UVOT Observations of GRB070707
  16. Swift XRT observation of GRB 070707
  17. GRB 070707: VLT observations
  18. GRB070704: FAVOR optical observations
  19. GRB 070704 : Liverpool Telescope Observations
  20. GRB 070611: VLT observations
  21. VLA detection of GRB 070612A in C Band
  22. GRB 070704: Swift-XRT refined analysis
  23. Swift/UVOT Observations of GRB070704
  24. GRB 070704, Swift-BAT refined analysis
  25. GRB 070704: Correction to GCN Circ 6594
  26. GRB 070704: Swift detection of a burst
  27. GRB 070626: Suzaku/WAM observation of the prompt emission
  28. GRB 070628 Swift-UVOT Refined Analysis
  29. GRB 070628: NIR detection of afterglow
  30. GRB 070628, Swift-BAT refined analysis
  31. GRB 070628: TAROT La Silla observatory optical observations
  32. Swift UVOT Observations of GRB 070628
  33. OT20050728 was not an optical GRB afterglow
  34. GRB 070616 : WIDGET simultaneous optical observations
  35. GRB 070616: Suzaku/WAM observation of the prompt emission
  36. GRB070621: RTT150 optical observations
  37. GRB 070621: VLT optical observations
  38. GRB 070621: Swift/UVOT Upper Limits
  39. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  40. GRB 070621: Swift-BAT refined analysis
  41. GRB070621: Swift XRT refined analysis
  42. GRB 070621: Gemini South optical imaging
  43. GRB 070621: UVOT-enhanced XRT position
  44. Observations of GRB070612A at Calar Alto
  45. GRB 070621: NOT observations
  46. GRB070621: OPTIMA-Burst optical upper limit
  47. GRB 070621: TAROT Calern observatory optical observations
  48. GRB 070621: Watcher Observations
  49. GRB 070621: Swift detection of a burst
  50. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  51. Swift/UVOT detection of GRB070616 optical afterglow.
  52. GRB 070612A: NOT observations
  53. GRB070616: Optical Observation by MITSuME Okayama
  54. GRB 070616, Swift-BAT further refined analysis
  55. GRB 070616: BTA optical observations
  56. GRB 070616: TLS observation
  57. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  58. GRB 070616: Swift detection of a burst
  59. GRB 070612B: optical observations
  60. UVOT Observations of INTEGRAL burst GRB070615
  61. VLA upper limit on GRB 070610
  62. GRB 070615
  63. SWIFT J195509.6+261406 (GRB 070610): further observations
  64. GRB 070612A: Super-LOTIS observations
  65. GRB 070612A: Rapid Decay
  66. GRB 070612A: Suzaku/WAM observation of the prompt emission
  67. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  68. GRB070612A: MITSuME Okayama Observation
  69. GRB 070612A: continued SARA observations
  70. GRB 070611: Watcher Observations
  71. Swift Trigger 282176 is Cygnus X-1
  72. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  73. GRB 070612B: SARA upper limit
  74. GRB 070612B, Swift-BAT refined analysis
  75. GRB 070612A, Swift-BAT refined analysis
  76. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  77. GRB 070612B: Swift/UVOT upper limits
  78. GRB 070612B: FRAM limit
  79. GRB070612B: P60 Observations
  80. GRB 070612A: SARA detection of possible OT
  81. GRB 070610: TAROT Calern observatory optical observations
  82. GRB 070610: MITSuME OAO optical upper limit
  83. GRB070612 - SDSS Pre-Burst Observations
  84. GRB 070612: Swift detection of a burst
  85. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  86. GRB 070610: SARA upper limit
  87. GRB 070610: Swift-XRT refined analysis
  88. GRB 070611: Swift/UVOT Observations
  89. GRB 070611: Swift-XRT refined analysis
  90. GRB 070611, Swift-BAT refined analysis
  91. GRB 070610: Optical observations from OSN
  92. GRB 070610: Watcher Observations
  93. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  94. GRB 070611: ROTSE-III Optical Limits
  95. GRB 070610: Swift-UVOT Upper Limits
  96. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  97. GRB 070610, Swift-BAT refined analysis
  98. GRB 070412: TAROT Calern observatory optical observations
  99. GRB 070411: TAROT Calern observatory optical observations
  100. GRB070520B: optical observations

Advanced

Download all Circulars as a .tar.gz archive:
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