Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

19089 results found.

  1. GRB 070724B: P60 Observations
  2. GRB 070724B: Swift/UVOT Upper limits
  3. GRB 070721A: optical observations
  4. GRB 070724A: further VLT observations
  5. Four radio sources in Swift-XRT error box of GRB 070724
  6. GRB 070724: P60 and Gemini Observations
  7. GRB 060814 - Keck host detection and redshift
  8. Swift/UVOT refined analysis of GRB070724
  9. GRB 070724: Swift-XRT Team refined analysis
  10. GRB 070721B: further observations and analysis
  11. GRB 070724: Swift detection of a burst
  12. GRB 070714B: Keck observations
  13. Swift/UVOT Observations of GRB070721A
  14. GRB 070721B : Faulkes Telescope South observations
  15. GRB 070721A : Faulkes Telescope South optical limit
  16. GRB 070721A: Swift/XRT refined analysis
  17. GRB 070721A, Swift-BAT refined analysis
  18. GRB070721B: A bright UVOT candidate
  19. GRB070714B: TNG NIR observations
  20. GRB 070714A: Swift/UVOT Upper limits
  21. GRB 070714B: Swift/UVOT Upper Limits
  22. GRB 070714B: confirmation of optical afterglow
  23. GRB 070616: No Evidence for I Band Afterglow
  24. GRB 070714A: Swift XRT refined analysis
  25. GRB070714B: Swift-XRT refined analysis
  26. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  27. GRB 070714 ("Bastille"): Optical Pre-Imaging
  28. GRB 070714 : Liverpool Telescope optical counterpart ?
  29. GRB 070714: Swift detection of a bright burst, possibly short
  30. GRB 070704: RTT150 optical observations
  31. GRB 070707: optical afterglow
  32. Swift/UVOT Observations of GRB070707
  33. Swift XRT observation of GRB 070707
  34. GRB 070707: VLT observations
  35. GRB070704: FAVOR optical observations
  36. GRB 070704 : Liverpool Telescope Observations
  37. GRB 070611: VLT observations
  38. VLA detection of GRB 070612A in C Band
  39. GRB 070704: Swift-XRT refined analysis
  40. Swift/UVOT Observations of GRB070704
  41. GRB 070704: Correction to GCN Circ 6594
  42. GRB 070704: Swift detection of a burst
  43. GRB 070628 Swift-UVOT Refined Analysis
  44. GRB 070628: NIR detection of afterglow
  45. GRB 070628: TAROT La Silla observatory optical observations
  46. GRB 070612A: Allen Telescope Array Observations
  47. GRB 070616 : WIDGET simultaneous optical observations
  48. GRB070621: RTT150 optical observations
  49. GRB 070621: VLT optical observations
  50. GRB 070621: Swift/UVOT Upper Limits
  51. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  52. GRB 070621: Gemini South optical imaging
  53. GRB 070621: UVOT-enhanced XRT position
  54. Observations of GRB070612A at Calar Alto
  55. GRB 070621: NOT observations
  56. GRB 070621: TAROT Calern observatory optical observations
  57. GRB 070621: Watcher Observations
  58. GRB 070621: Swift detection of a burst
  59. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  60. Swift/UVOT detection of GRB070616 optical afterglow.
  61. GRB070616: Optical Observation by MITSuME Okayama
  62. GRB 070616: TLS observation
  63. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  64. GRB 070616: Swift detection of a burst
  65. GRB 070612B: optical observations
  66. UVOT Observations of INTEGRAL burst GRB070615
  67. VLA upper limit on GRB 070610
  68. GRB 070615
  69. SWIFT J195509.6+261406 (GRB 070610): further observations
  70. GRB 070612A: Super-LOTIS observations
  71. GRB 070612A: Rapid Decay
  72. GRB070612A: MITSuME Okayama Observation
  73. GRB 070612A: continued SARA observations
  74. GRB 070611: Watcher Observations
  75. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  76. GRB 070612B: SARA upper limit
  77. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  78. GRB 070612B: Swift/UVOT upper limits
  79. GRB 070612B: FRAM limit
  80. GRB070612B: P60 Observations
  81. GRB 070612A: SARA detection of possible OT
  82. GRB 070610: TAROT Calern observatory optical observations
  83. GRB 070610: MITSuME OAO optical upper limit
  84. GRB070612 - SDSS Pre-Burst Observations
  85. GRB 070610: SARA upper limit
  86. GRB 070610: Swift-XRT refined analysis
  87. GRB 070611: Swift/UVOT Observations
  88. GRB 070610: Optical observations from OSN
  89. GRB 070610: Watcher Observations
  90. GRB 070611: ROTSE-III Optical Limits
  91. GRB 070610: Swift-UVOT Upper Limits
  92. GRB 070412: TAROT Calern observatory optical observations
  93. GRB 070411: TAROT Calern observatory optical observations
  94. GRB 070531: NOT nIR observations
  95. GRB 070531: I-band observations from IAC80
  96. GRB 070531: Liverpool Telescope Optical Observations
  97. GRB 070531: Swift detection of a burst
  98. GRB 070529: SARA upper limit
  99. Swift/UVOT refined analysis of GRB070529
  100. GRB 070529: Optical aterglow from MIRO

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