Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

42617 results found.

  1. GRB 080319C: KAIT OA observations
  2. GRB 080320 - SDSS Pre-Burst Observations
  3. GRB 080320: Swift detection of a burst
  4. GRB 080320: ROTSE-III Optical Limits
  5. GRB 080319B : Lulin observation of temporal break at 0.2 days
  6. GRB 080319B: optical observations
  7. GRB 080319C - SDSS Pre-Burst Observations
  8. GRB 080319A SDSS Pre-Burst Observations
  9. Swift-BAT trigger 306829 is IGR J16479-4514
  10. GRB080319B - SDSS Pre-Burst Observations
  11. GRB 080319B: RAPTOR observations of a naked eye burst
  12. GRB 080319A: Swift-XRT Team Refined Analysis
  13. GRB 080319B, Swift-BAT refined analysis
  14. GRB080319B: Prompt PROMPT Detections
  15. GRB 080319C: Swift-XRT Team Refined Analysis
  16. GRB 080319B: Swift-XRT Team Refined Analysis
  17. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  18. GRB 080319C: AGILE-MCAL observation of the prompt emission
  19. GRB 080319B: Hobby-Eberly Telescope Spectroscopy
  20. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  21. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  22. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  23. GRB 080319B: TORTORA synchronous observation
  24. VLT/UVES redshift of GRB 080319B from FeII fine-structure lines
  25. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  26. GRB 080319B: Enhanced Swift-XRT position
  27. GRB 080319A: Enhanced Swift-XRT position
  28. GRB 080319A, Swift-BAT refined analysis
  29. GRB 080319B: REM early data
  30. VLT/UVES redshift of GRB 080319B
  31. GRB 080319C: Early Super-LOTIS Observations
  32. GRB 080319C: Swift detection of a burst with an optical afterglow
  33. GRB 080319C: KAIT OA candidate
  34. GRB 080319A: REM observations
  35. GRB 080319B: Change in power law decay index
  36. GRB 080319B: Gemini-South Spectroscopy
  37. GRB 080319A: optical observations at the NOT
  38. GRB0 080319B : LOAO optical observation
  39. GRB 080319b: Early IR Imaging from PAIRITEL
  40. GRB080319B Liverpool Telescope optical afterglow candidate
  41. GRB 080319B: Super-LOTIS Detection of a Bright OT
  42. GRB 080319B: REM observations
  43. GRB 080319B: KAIT OA
  44. GRB080319A: P60 Optical Afterglow Observations
  45. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  46. GRB 080319A: Swift detection of a burst
  47. Swift Trigger 306745 is not a GRB
  48. Swift Trigger 306616 is not a GRB
  49. GRB080310, LBT and MDM photometry
  50. GRB080315: Bok Optical Observations
  51. Swift/UVOT observations of GRB 080315
  52. Swift trigger 306323: Swift-BAT/XRT refined analysis
  53. SAX J1818.6-1703: Swift detection (trigger 306379)
  54. GRB 080315: Optical observations
  55. GRB 080315: TAROT Calern observatory optical observations
  56. GRB 080315: Swift detection of a possible burst
  57. GRB080310 : Lulin Optical observations
  58. GRB080310, unusual slow decay in the optical
  59. GRB080310 : Optical observations by LOAO and Lulin
  60. GRB 080310: ROTSE-III Observations of Optical Counterpart
  61. GRB080310: Optical observation by MITSuME telescope
  62. GRB080310, optical observations with the LBT
  63. GRB 080229A: GAO 150cm telescope Optical Observation
  64. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  65. GRB 080307: NIR upper limit
  66. GRB 080229: NIR upper limit
  67. GRB 080310: early RAPTOR multicolor observations
  68. GRB 080310, Swift-BAT refined analysis
  69. GRB080210: optical observations
  70. GRB080307: optical upper limit
  71. GRB 080310: Swift-XRT refined analysis
  72. GRB 080310: Swift/UVOT Refined Analysis
  73. GRB 080310: Redshift from Keck/DEIMOS Spectra
  74. GRB 080310 - SDSS Pre-Burst Observations
  75. GRB 080310: Enhanced Swift-XRT position
  76. GRB 080310: RRM optical photometry with the VLT
  77. GRB080310, detection of break in optical
  78. GRB 080310: VLT/UVES spectroscopy
  79. GRB080310, optical observations with LBT
  80. GRB 080310: Lick/Kast Spectroscopy
  81. GRB080310: Super-LOTIS suggestion of brightening
  82. GRB 080310, SMARTS optical/IR afterglow observations
  83. GRB 080310: REM observations
  84. GRB 080310: Magellan redshift
  85. GRB 080310 afterglow candidate (correction to UT time)
  86. GRB 080310: Swift detection of a burst with optical afterglow
  87. GRB 080310 afterglow candidate
  88. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  89. GRB 080307: Swift-XRT Team refined analysis
  90. GRB 080307: Swift/UVOT Upper Limits
  91. GRB 080307, Swift-BAT refined analysis
  92. GRB080307 - SDSS Pre-Burst Observations
  93. GRB 080307: TNT optical observation
  94. GRB080307: Optical upper limits
  95. GRB 080307: Gemini-N i-band observations - candidate afterglow
  96. GRB 080307: BOAO imaging - retraction and new limit
  97. GRB 080307: retraction of UVOT candidate
  98. GRB 080307: Enhanced Swift-XRT position
  99. GRB 080307, Preliminary Swift-BAT refined analysis
  100. GRB 080307: Swift detection of a burst

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