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"

42960 results found.

  1. GRB 051221: IR Observations at GRB+1hr
  2. GRB 051221: Swift detection of a bright short burst
  3. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  4. GRB051211A (=H3979): Refined Analysis
  5. GRB 051211B: optical afterglow
  6. Swift detection of an RS CVn flare star
  7. Swift Trigger 172767 is not a GRB
  8. GRB 051215: near-infrared observations
  9. GRB051215 - SDSS pre-burst observations
  10. GRB 051215: Swift detection of a possible burst
  11. GRB 051215: A short GRB in a cluster?
  12. GRB051105: optical observations
  13. GRB 051213: Swift-BAT refined analysis
  14. GRB051211B: XRT refined analysis
  15. GRB 051213: Swift-BAT detection of a burst
  16. GRB 051211a: RTT150 optical observations
  17. GRB051211B, RBO optical observations
  18. GRB 051211B: Swift XRT confirmation of the afterglow
  19. GRB051211B: Liverpool Telescope observation
  20. GRB 051211b: RTT150 optical observations
  21. GRB051211b: P60 Observations
  22. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  23. GRB 051211B: Swift XRT Observations
  24. GRB 051210: Magellan Imaging
  25. GRB 051211: TAROT optical limits
  26. GRB 051211B: a possible optical detection by TAROT
  27. GRB 051211B: a long GRB detected by INTEGRAL
  28. GRB 051211: Swift XRT upper limit
  29. GRB 051211:IAC80 optical observations
  30. HETE SXC localization of GRB 051211 (=H3979)
  31. GRB 051210: Optical imaging from Las Campanas
  32. GRB 051210: SALT detection limit
  33. GRB 051210: BAT further refined analysis of the short burst
  34. GRB 051210: Swift XRT refined analysis
  35. GRB 051210: FRAM early limit
  36. GRB 051210: A short GRB in a cluster?
  37. GRB 051210: Swift detection of a burst
  38. IPN observations of SGR1806-20
  39. Swift XRT positions
  40. An extraordinary long burst on December 3 from SGR1806-20
  41. IBAS Alert 2706 : not a real GRB
  42. Possible resuming of the SGR 1806-20 activity
  43. Swift-BAT trigger 165579 is not a GRB
  44. GRB 051127: Swift-BAT detection of a possible burst
  45. GRB051117B: Swift XRT refined analysis
  46. GRB051117b: No Swift/UVOT Detection
  47. GRB051111: Rc optical observations: correction
  48. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  49. GRB051111: Suzaku WAM observation of the prompt emission
  50. GRB051111: Rc optical observations
  51. GRB051008: Suzaku WAM observation of the prompt emission
  52. GRB 051109B: GAO 150cm telescope Optical limit
  53. GRB 051109A : GAO 150cm telescope Rc-band detection
  54. GRB 051021 Optical Observations
  55. GRB 051117B: MARGE Optical Limits
  56. GRB 051117A and B: Radio Observations
  57. GRB 051117B: R and I observations of possible host galaxy
  58. GRB 051117b: NIR observations
  59. GRB 051117A: Refined analysis of the Swift-BAT burst
  60. GRB051117A : XRT refined analysis
  61. GRB 051117B: Lulin R and I band observation
  62. GRB 051117B: Optical observations
  63. GRB 051117B: ROTSE-III Optical Limits
  64. GRB051117B: Swift XRT position
  65. GRB 051117B: Swift detection of a burst
  66. GRB 051117: Swift detection of a bright burst
  67. GRB051114: results of the Swift-XRT observation
  68. GRB 051028 Optical Observations
  69. GRB 051109B : Nainital upper limits
  70. GRB 051114: Swift-BAT refined analysis
  71. GRB050925: analysis of the XMM-Newton observation
  72. GRB051109A optical observations
  73. GRB 051114: Swift-BAT detection of a short burst
  74. GRB 051111: Further spectroscopic analysis
  75. GRB 051113: Swift-BAT refined analysis
  76. GRB 051113: Swift-BAT detection of a burst
  77. GRB 051111: AEOS optical observations
  78. GRB051103: Radio Observations
  79. GRB 051109A Milagro GeV/TeV Observations
  80. GRB/SGR 050925: XMM-Newton ToO observation
  81. GRB051111: Swift/UVOT Observations
  82. GRB 051111A : R-band temporal decay index based on Lulin
  83. GRB051111: XRT preliminary analysis
  84. GRB 051111: Swift-BAT refined analysis
  85. GRB 051109A Optical Observations
  86. GRB 051111A : Lulin BVRI multi band afterglow observation
  87. GRB051111a: SARA Observations
  88. GRB 051111a: IR photometry
  89. GRB 051111: Keck HIRES redshift
  90. GRB 051111A: KAIT optical observations
  91. GRB 051111a: Afterglow fading in Ic
  92. GRB051111: Super-LOTIS Early Detection
  93. Faulkes Telescope R-band detection of GRB051111
  94. GRB 051103 Milagro GeV/TeV Observations
  95. GRB051111: Swift-BAT detection of a bright burst
  96. GRB 051008 Tautenburg Supernova Search
  97. GRB 051109B. Radio Observations
  98. GRB 051109A
  99. GRB 051105a: GETS optical limit
  100. GRB 051109b: GETS 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