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"

42813 results found.

  1. GRB 100901A: Gemini-N Redshift
  2. GRB 100901A: MASTER: the OT brightenning
  3. GRB 100901A: confirmation of the afterglow
  4. GRB 100901A: MASTER Optical Early Limits
  5. GRB 100901A: Faulkes Telescope North afterglow candidate
  6. GRB 100901A: Swift detection of a burst with an optical afterglow
  7. Konus-Wind observation of GRB 100826A
  8. GRB 100829.9: MASTER Optical Limits
  9. IPN triangulation of GRB 100826A
  10. GRB100826A: Fermi-LAT Observations
  11. GRB 100823A: optical upper limit
  12. GRB 100814A: Maidanak optical observations
  13. GRB 100823A: optical observations
  14. GRB 100823A: MAXI/GSC detection
  15. GRB 100725B: Mondy optical upper limit
  16. GRB 100725B: Maidanak optical upper limit
  17. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  18. GRB100807A: R band observations
  19. GRB100823A : MOA optical observation
  20. GRB 100823A: Candidate IR afterglow
  21. GRB 100823A: Swift XRT refined analysis
  22. GRB 100823A: VLT/X-Shooter spectroscopy
  23. GRB 100823A - second epoch WHT observations
  24. GRB 100823A: TNG NIR observations
  25. GRB 100823: 1.5m OSN I-band observations
  26. GRB 100823A: WHT observations
  27. GRB 100823A: Swift-BAT refined analysis
  28. GRB 100823A: Enhanced Swift-XRT position
  29. GRB 100823A: Swift detection of a burst
  30. GRB 100814A: Suzaku WAM observation of the prompt emission
  31. GRB 100814A: ISON-NM optical observations
  32. IBAS Alert n. 6057 is not due to a GRB
  33. EVLA radio afterglow detection of GRB 100814A
  34. GRB 100814B: Fermi GBM detection
  35. GRB 100814A: optical observations
  36. Konus-Wind observation of GRB 100816A
  37. GRB 100816A: 10.4-m GTC redshift confirmation
  38. GRB 100816A: Fermi GBM observation
  39. GRB 100816A: VLT and Gemini-N revised redshift
  40. GRB 100814A : Liverpool Telescope Observations
  41. GRB 100814A: NOT optical observations
  42. GRB 100816A: NOT optical observations
  43. Konus-Wind observation of GRB 100814A
  44. GRB 100816A: Gemini-N spectroscopy
  45. GRB 100816A: Swift UVOT Observations
  46. GRB100816A Swift-XRT refined analysis
  47. GRB 100816A: Swift-BAT spectral lag results
  48. GRB 100816A: 1.23m CAHA optical observations
  49. GRB 100816A, Swift-BAT refined analysis
  50. GRB 100816A: Enhanced Swift-XRT position
  51. GRB 100816A: Gemini-N imaging
  52. GRB 100816A: CQUEAN riz-band Detection, Host Galaxy?
  53. GRB100814A - interesting UVOT lightcurve.
  54. GRB 100816A: TAROT Calern observatory optical detection
  55. GRB 100816A: MASTER Optical Limits
  56. GRB100816A: TNG optical afterglow confirmation.
  57. GRB 100816A: ROTSE-III Optical Limits
  58. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  59. Swift-BAT trigger 431756 is not a burst
  60. GRB 100814A: Fermi GBM observation
  61. GRB 100814A: Submm observations from APEX
  62. Swift/UVOT Observations of GRB100814A - a clearer table.
  63. GRB 100814A: Swift-XRT refined analysis
  64. Swift/UVOT observations of GRB100814A
  65. GRB 100814A, Swift-BAT refined analysis
  66. GRB 100814A: CQUEAN r- and i-band Observation
  67. GRB 100814A: Enhanced Swift-XRT position
  68. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  69. GRB 100814A: IAC80 R-band observations
  70. GRB100814A: Magellan Echellette Observations
  71. GRB 100814A: Swift UVOT observations of the optical afterglow
  72. GRB 100814A: Swift detection of a burst with an optical afterglow
  73. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  74. Swift-BAT trigger 431582 likely is IGR J17464-2811
  75. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  76. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  77. GRB 100802A: further NOT observation
  78. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  79. GRB 100807A: P200 Infrared Observations
  80. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  81. GRB100807A: optical observation in CrAO
  82. GRB 100805A: optical observation in CrAO
  83. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  84. GRB 100807A: Swift XRT refined analysis
  85. GRB 100807A: P60 Optical Afterglow Discovery
  86. GRB 100807A: Swift/UVOT Upper Limits
  87. GRB 100805A: SAO RAS optical observations
  88. GRB 100807A: Enhanced Swift-XRT position
  89. GRB 100807A: Swift-BAT refined analysis
  90. GRB 100807A: Swift detection of a burst
  91. GRB 100805A: IAC80 and 1.5m OSN optical observations
  92. GRB 100805A: Xinglong TNT optical observation
  93. GRB 100805A: ROTSE-III Optical detection
  94. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  95. GRB 100802A: WIYN observations
  96. GRB 100805A: IAC80 BVR-band observations
  97. Swift-BAT trigger 430975 is not a burst
  98. GRB 100805A: Swift-BAT refined analysis
  99. GRB 100805A: Swift-XRT Refined Analysis
  100. GRB 100805A: GRAS 002 optical observations

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