Skip to main content
New! Browse Circulars by Event, Advanced Search, Sample Codes, Schema Release. 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"

10826 results found.

  1. GRB 070721B, Swift-BAT refined analysis
  2. GRB 070714B : Suzaku WAM observation of the prompt emission
  3. GRB 070714A: Swift-BAT T_zero
  4. GRB 070616: No Evidence for I Band Afterglow
  5. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  6. SN 2007bg - off-axis GRB?
  7. GRB 070704: RTT150 optical observations
  8. GRB 070704: Suzaku/WAM observation of the prompt emission
  9. Konus-Wind observation of GRB 070707
  10. GRB 070707: VLT observations
  11. GRB070704: FAVOR optical observations
  12. Konus-Wind observation of GRB 070626
  13. Swift/UVOT Observations of GRB070704
  14. GRB 070704: Correction to GCN Circ 6594
  15. GRB 070704: Swift detection of a burst
  16. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  17. GRB 070628, Swift-BAT refined analysis
  18. GRB 070628: Watcher Observations
  19. Swift UVOT Observations of GRB 070628
  20. GRB 070628: Swift detection of a possible burst
  21. GRB 070612A: Second Epoch WSRT Radio Observations
  22. GRB 070621: Swift-BAT refined analysis
  23. GRB 070621: ROTSE-III Prompt Optical Limits
  24. GRB 070621: Swift detection of a burst
  25. Swift/UVOT observations of GRB070616
  26. GRB 070615: A long GRB detected by INTEGRAL
  27. SWIFT J195509.6+261406 (GRB 070610): further observations
  28. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  29. GRB 070612A, Swift-BAT refined analysis
  30. GRB 070612A: SARA detection of possible OT
  31. GRB 070612B: Swift detection of a burst
  32. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  33. GRB 070610: Watcher Observations
  34. GRB 070611: ROTSE-III Optical Limits
  35. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  36. GRB 070610, Swift-BAT refined analysis
  37. GRB 070610: Swift detection of a burst
  38. GRB 070419A, deep LBT photometry and possible supernova detection
  39. GRB070520B: optical observations
  40. GRB070520: optical observation
  41. GRB070518: optical observation
  42. GRB070521: optical observation
  43. Swift/UVOT refined analysis of GRB070531
  44. GRB 070531: Swift-BAT refined analysis
  45. GRB 070531: Swift detection of a burst
  46. Swift/UVOT refined analysis of GRB070529
  47. GRB 070529: MARGE Observations
  48. Konus-Wind observation of GRB 070521
  49. GROND upper limits of GRB 070521
  50. GRB 070520A: SARA upper limit
  51. GRB 070521: SARA upper limit
  52. GRB 070521: optical limit by Pi of the Sky
  53. GRB 070521: Swift detection of a burst
  54. GRB 070520: Xinglong EST optical Upper Limit
  55. GRB 070517: Swift detection of a burst
  56. GRB 070512: IPN localization and Konus spectrum of a bright burst
  57. GRB070419A: optical observations
  58. Konus-Wind and Konus-A observation of GRB 070508
  59. RHESSI Spectrum of GRB070508
  60. GRB 070508: Suzaku/WAM observation of the prompt emission
  61. GRB 070509: ROTSE-III Optical Limits
  62. GRB 070508, Swift-BAT refined analysis
  63. GRB 070508: Optical observation limiting magnitude
  64. GRB 070508: Optical afterglow detection
  65. GRB 070508: Swift detection of an intense burst with an optical counterpart
  66. GRB 070429A: Swift XRT refined analysis
  67. GRB 070429B: Swift XRT refined analysis
  68. GRB 070429B: ROTSE-III Optical Limits
  69. GRB 070429: ROTSE-III Optical Limits
  70. GRB 070427, Swift-BAT Refined Analysis
  71. GRB 070420, SMARTS optical/IR afterglow observations
  72. Konus-Wind observation of GRB 070420
  73. GRB070420: Swift UVOT continuing observations
  74. GRB 070420: NIR and optical afterglow confirmed
  75. GRB 070419A: Early Super-LOTIS Observations
  76. GRB 070419A: SARA observations
  77. GRB 070419B optical afterglow candidate
  78. GRB 070419B: optical afterglow candidate
  79. GRB 070419A: ROTSE-III Optical Limits
  80. GRB 070419: Swift detection of a burst
  81. GRB 070318, SMARTS optical/IR afterglow observations
  82. GRB 070411: Swift/UVOT observations
  83. GRB 070411: Optical photometry at Crni Vrh
  84. GRB 070411, Swift-BAT refined analysis
  85. GRB 070411 : Liverpool Telescope Observations
  86. GRB 070411: Optical observations at Crni Vrh
  87. GRB 070411: ROTSE-III Detection of Optical Counterpart
  88. GRB 070411: Tautenburg RRM Afterglow Confirmation
  89. GRB 070411: Swift detection of a burst with optical afterglow
  90. GRB 070406: Swift XRT team further analysis
  91. Suzaku ToO observation of SGR 1806-20
  92. GRB 070406: Gemini South Imaging and XRT analysis
  93. GRB 070406: SARA upper limit
  94. GRB 070406: Xinglong TNT optical Upper Limit
  95. Konus-Wind and Konus-A observations of GRB 070402
  96. IPN triangulation of GRB070402
  97. INTEGRAL ToO Observation of SGR1806-20
  98. Konus-Wind observation of GRB 070328
  99. long burst from SGR 1806-20 detected on March 26
  100. GRB 070328: Swift/XRT Refined Analysis

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