Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

32688 results found.

  1. GRB 070707: object inside XRT error circle
  2. Swift/UVOT Observations of GRB070707
  3. Swift XRT observation of GRB 070707
  4. GRB 070707: VLT observations
  5. GRB 070429B: NIR Observations
  6. GRB070704: FAVOR optical observations
  7. GRB 070704 : Liverpool Telescope Observations
  8. GRB 070611: VLT observations
  9. VLA detection of GRB 070612A in C Band
  10. Konus-Wind observation of GRB 070626
  11. GRB 070704: Swift-XRT refined analysis
  12. Swift/UVOT Observations of GRB070704
  13. GRB 070704, Swift-BAT refined analysis
  14. GRB 070704: Correction to GCN Circ 6594
  15. GRB 070626: Suzaku/WAM observation of the prompt emission
  16. GRB 070628 Swift-UVOT Refined Analysis
  17. GRB 070628: NIR detection of afterglow
  18. GRB 070628, Swift-BAT refined analysis
  19. GRB 070628: TAROT La Silla observatory optical observations
  20. GRB 070628: Swift XRT refined analysis
  21. GRB 070628: Watcher Observations
  22. GRB 070612A: Allen Telescope Array Observations
  23. INTEGRAL burst GRB070615: X-ray continued observations
  24. GRB 070616 : WIDGET simultaneous optical observations
  25. GRB 070616: Suzaku/WAM observation of the prompt emission
  26. GRB 070612A: Second Epoch WSRT Radio Observations
  27. GRB070621: RTT150 optical observations
  28. GRB 070621: VLT optical observations
  29. GRB 070621: Swift/UVOT Upper Limits
  30. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  31. GRB 070621: Swift-BAT refined analysis
  32. GRB070621: Swift XRT refined analysis
  33. GRB 070621: Gemini South optical imaging
  34. Observations of GRB070612A at Calar Alto
  35. GRB 070621: NOT observations
  36. GRB070621: OPTIMA-Burst optical upper limit
  37. GRB 070621: Watcher Observations
  38. GRB 070621: ROTSE-III Prompt Optical Limits
  39. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  40. GRB 070612A: TNG optical observations
  41. Swift/UVOT detection of GRB070616 optical afterglow.
  42. GRB070612A: Gemini Spectroscopic Redshift
  43. GRB 070612A: NOT observations
  44. GRB070616: Optical Observation by MITSuME Akeno
  45. GRB 070612B: Optical Observation by MITSuME Akeno
  46. GRB070616: Optical Observation by MITSuME Okayama
  47. GRB 070616, Swift-BAT further refined analysis
  48. GRB 070616: Swift XRT refined circular
  49. GRB 070612A: Possible WSRT Radio Detection
  50. Swift/UVOT observations of GRB070616
  51. GRB 070616: TLS observation
  52. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  53. GRB 070616, Swift-BAT partial refined analysis
  54. GRB 070612B: optical observations
  55. VLA upper limit on GRB 070610
  56. GRB 070615
  57. GRB 070612A: Super-LOTIS observations
  58. GRB 070612A: Rapid Decay
  59. GRB 070612A: Suzaku/WAM observation of the prompt emission
  60. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  61. GRB070612A: MITSuME Okayama Observation
  62. GRB 070612A: continued SARA observations
  63. GRB 070612A: spectral lag
  64. GRB 070611: Watcher Observations
  65. GRB 070612A: MDM Observations
  66. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  67. GRB 070612B: SARA upper limit
  68. GRB 070612B, Swift-BAT refined analysis
  69. GRB 070612A, Swift-BAT refined analysis
  70. GRB 070612B: Swift-XRT refined analysis
  71. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  72. GRB 070612B: Swift/UVOT upper limits
  73. GRB070612B: P60 Observations
  74. GRB 070612B: KAIT limits
  75. GRB 070612A: SARA detection of possible OT
  76. GRB 070612B: Swift XRT position from downlink data
  77. GRB 070610: MITSuME OAO optical upper limit
  78. GRB070612 - SDSS Pre-Burst Observations
  79. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  80. GRB 070610: SARA upper limit
  81. GRB 070610: Swift-XRT refined analysis
  82. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  83. GRB 070611: Swift/UVOT Observations
  84. GRB 070611: Swift-XRT refined analysis
  85. GRB 070611, Swift-BAT refined analysis
  86. GRB 070610: Watcher Observations
  87. GRB 070611: VLT redshift
  88. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  89. GRB 070611; Swift-XRT position
  90. GRB 070611: ROTSE-III Optical Limits
  91. GRB 070610: Swift-UVOT Upper Limits
  92. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  93. GRB 070610, Swift-BAT refined analysis
  94. GRB 070610; Swift-XRT position
  95. GRB 070411: TAROT Calern observatory optical observations
  96. GRB 070419A, deep LBT photometry and possible supernova detection
  97. GRB070520B: optical observations
  98. GRB070520: optical observation
  99. GRB070518: optical observation
  100. GRB070521: optical observation

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