Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

15987 results found.

  1. GRB 080707: VLT redshift
  2. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  3. Trigger 316063: Swift detection of a transient
  4. GRB 080702B: GROND Upper Limits
  5. GRB 080703: UVOT Follow-Up Observation
  6. GRB 080703: VLT observations of the afterglow
  7. GRB 080703: Swift detection of a burst with optical afterglow
  8. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  9. GRB 080702b: LCO optical observations
  10. GRB 080702B: Swift XRT and UVOT observations
  11. GRB 080702A: MITSuME Akeno optical upper limits
  12. GRB 080701A: Early RAPTOR optical limits
  13. Swift Trigger 315630: Swift/UVOT Upper Limits
  14. GRB 080701A, VATT optical upper limit
  15. GRB 080701: Swift detection of a burst
  16. GRB 080625: Swift/UVOT Follow-Up Observations
  17. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  18. GRB080623: Swift UVOT followup observations
  19. GRB 080623: TAROT La Silla observatory optical observations
  20. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  21. GRB080607: optical observation
  22. GRB 080603b: optical observation
  23. GRB 070809: Putative host galaxy and redshift
  24. GRB 0800603A: optical observation
  25. GRB080613B: MITSuME upper limits
  26. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  27. GRB 080603A: optical observations on June 04
  28. GRB 080613A: Swift-XRT detection of the afterglow
  29. GRB080613A: Swift/UVOT Upper Limits
  30. GRB 080613B - NOT optical and IR nondetections
  31. GRB080613B: Swift/UVOT Upper Limits
  32. GRB 080613: Faulkes Telescope North optical candidate
  33. GRB 080603A: Late-time Keck imaging and spectroscopy
  34. GRB 080603b: optical observation
  35. GRB080605: optical observation with the MITSuME-OAO telescope
  36. GRB080607: RTT150 optical observations
  37. GRB 080603A: optical observations
  38. Swift/UVOT Observations of GRB080607
  39. GRB 080605: optical observations
  40. GRB 080607 KAIT observations
  41. VLA detection of INTEGRAL burst GRB 080603A
  42. GRB 080605: GROND 2nd epoch observations
  43. GRB 080607 - PAIRITEL NIR detection
  44. GRB 080607: Keck/LRIS spectroscopy and redshift
  45. GRB 080607: Swift detection of a burst with optical afterglow
  46. GRB 080607: ROTSE-III Detection of Optical Counterpart
  47. GRB 080605: Swift-UVOT refined analysis
  48. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  49. GRB080605: observation by BOOTES
  50. GRB 080605: GROND detection of the optical afterglow candidate
  51. GRB080605: optical observations
  52. GRB 080605: VLT redshift
  53. GRB 080605: Liverpool Telescope optical afterglow candidate
  54. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  55. GRB 080605: Swift detection of a burst with an optical afterglow
  56. GRB 080603B: PAIRITEL infrared detection
  57. GRB 080603A: PAIRITEL infrared detection
  58. Swift/UVOT observations of GRB080604
  59. GRB 080604: Gemini-North spectroscopy
  60. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  61. GRB 080603B : Liverpool Telescope Observations
  62. GRB 080430: optical observations
  63. GRB 080603B: Swift/UVOT detection of the afterglow
  64. GRB 080604: Hobby-Eberly Telescope spectroscopy
  65. GRB 080603A: Swift/UVOT detection of the afterglow
  66. GRB080603B: RTT150 optical observations, break in light curves
  67. GRB080604: confirmation of optical afterglow
  68. GRB 080604: Swift detection of a burst with an optical afterglow
  69. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  70. GRB 080516: TAROT La Silla observatory optical observations
  71. GRB 080603B: BOOTES2/TELMA optical observations
  72. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  73. GRB 080603B: Swift detection of a burst with optical afterglow
  74. GRB080603: Super-LOTIS detection of Optical Counterpart
  75. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  76. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  77. GRB 080523: afterglow confirmation and redshift constraints
  78. GRB 080503: 2nd Epoch Chandra X-ray Observations
  79. GRB 080523: VLT optical observations
  80. Swift/UVOT observations of GRB 080523
  81. GRB 80516: Swift/UVOT Observations
  82. GRB 080514B: UVOT Observations
  83. GRB 080520: VLT redshift
  84. GRB 080520: Swift detection of a burst with optical afterglow
  85. GRB080517: Liverpool Telescope Optical Observations
  86. GRB 080517: Swift detection of a burst
  87. GRB080430: optical observations
  88. GRB 080516, SMARTS optical/IR observations
  89. GRB 080514B: Finding chart
  90. GRB080514: REM NIR & Optical Observations
  91. GRB 080506: NAYUTA Optical Observation
  92. GRB 080507: Keck photometry
  93. GRB 080507: E Pur Si Muove!
  94. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  95. GRB 080503: Hubble Space Telescope Imaging
  96. GRB080507: Swift/UVOT followup observations
  97. GRB 080507: Optical Afterglow
  98. GRB 080506:Optical observations from HCT
  99. GRB 080503: Fading in continued Gemini imaging
  100. GRB080503, RIMOTS optical upper limit

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