Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

21983 results found.

  1. GRB080310, optical observations with the LBT
  2. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  3. GRB 080310: early RAPTOR multicolor observations
  4. GRB080210: optical observations
  5. GRB 080310 - SDSS Pre-Burst Observations
  6. GRB 080310: RRM optical photometry with the VLT
  7. GRB 080310: VLT/UVES spectroscopy
  8. GRB080310, optical observations with LBT
  9. GRB080310: Super-LOTIS suggestion of brightening
  10. GRB 080310, SMARTS optical/IR afterglow observations
  11. GRB 080310: REM observations
  12. GRB 080310: Magellan redshift
  13. GRB 080307: Swift/UVOT Upper Limits
  14. GRB080307 - SDSS Pre-Burst Observations
  15. GRB 080307: TNT optical observation
  16. GRB080307: Optical upper limits
  17. GRB 080307: Gemini-N i-band observations - candidate afterglow
  18. GRB 080307, Preliminary Swift-BAT refined analysis
  19. GRB 080307: Optical observation with DMC/KANATA
  20. Swift UVOT observations of GRB080229B
  21. GRB 080303A: Faulkes Telescope South optical afterglow observations
  22. GRB 080303
  23. GRB 080229: I-band observations from OSN
  24. GRB 080229: VLT NIR observations
  25. GRB 080229: TNG NIR observations
  26. GRB 080229: Deep Gemini/GMOS optical observations
  27. GRB 080229: REM NIR observations
  28. GRB080229: Possible optical afterglow
  29. GRB 080229: Faulkes Telescope South optical limit
  30. Early optical shallow decay in GRB 071112C
  31. GRB080207: optical observations
  32. GRB080205: optical observations
  33. GRB080211: optical observations
  34. GRB 071010B : Early optical brightening detected by TAOS
  35. Swift-XRT improved positions, and new redshift limits.
  36. ESO optical and NIR observations of GRB 080218B
  37. GRB 080218B: Swift-XRT refined analysis
  38. Swift/UVOT observations of GRB080218B
  39. GRB 080212: Mount Abu NIR observations
  40. GRB 080218B: GROND upper limits
  41. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  42. GRB 080212: VLT optical rapid decay
  43. GRB 080212: REM refined analysis
  44. GRB 080212: Gemini-South optical observations
  45. GRB 080212: GROND detects afterglow
  46. GRB 080212: REM NIR afterglow?
  47. GRB 080212: optical observations
  48. GRB 080210: Keck photometry
  49. GRB 080212: DSS/2MASS Galaxy at XRT position
  50. GRB 080207: VLT NIR early upper limits
  51. GRB 080207: optical observations.
  52. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  53. GRB 080210: Super-LOTIS observations
  54. GRB 080210: Swift-XRT Refined Analysis
  55. GRB 080210: GOND detection in all bands and redshift upper limit
  56. GRB080210 - SDSS Pre-Burst Observations
  57. GRB 080210: TAROT La Silla observatory optical detection
  58. GRB 080207: GROND upper limits
  59. GRB 080207: Optical limits from Gemini-South
  60. GRB 080205: RTT150 optical observations
  61. GRB 080207: Super-LOTIS observations
  62. GRB080207: RTT150 Optical Observations
  63. GRB 080207: REM NIR observations
  64. GRB080207: Swift/UVOT refined analysis
  65. GRB 080207: TAROT Calern observatory optical observations
  66. GRB 080205 optical upper limit
  67. GRB 080205: MASTER optical observation
  68. INT+WFC R-band observations of GRB 080205
  69. GRB 080205: Swift XRT refined analysis
  70. GRB 080205: OA evolution from KAIT observations
  71. GRB 080205: Swift/UVOT observations
  72. GRB 080205: KAIT OA detection
  73. GRB 080130: further Swift XRT observations confirm fading source
  74. GRB 080129: Swift/UVOT Refined Upper Limits
  75. Swift/UVOT observations of GRB080130
  76. GRB 080130: REM NIR observations
  77. GRB 080129: Optical observations from OSN
  78. X-ray transient in NGC 2770: RTT150 optical observations
  79. GRB 080129: KAIT optical limits
  80. GRB 080129: TAROT La Silla observatory optical observations
  81. GRB 080129: Gemini-South photometry
  82. GRB 080129: GROND detection in all bands, and fading
  83. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  84. GRB 080129: Gemini-South Imaging Observations
  85. A new website of high-level data products for Swift GRBs
  86. GRB 080121: Swift/UVOT upper limits
  87. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  88. GRB 080123: Swift/UVOT refined analysis
  89. X-ray transient in NGC 2770: RTT150 optical observations
  90. GRB 080120: GROND confirmation of the optical afterglow
  91. UVOT detection of GRB080120
  92. GRB 080120: GROND detection
  93. XRF 080109 / SN 2008D: 1.4 GHz WSRT Radio Observations
  94. Transient in NGC2770 / SN2008D: Metallicity of nearby HII regions
  95. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  96. XRF 080109 / SN 2008D: WSRT Radio Detection
  97. Transient 080109/ SN 2008D, metallicity of the host galaxy
  98. Transient 080109/ SN 2008D, IR Spectrum
  99. XRF 080109 / SN 2008D: optical observations
  100. NGC 2770B has the same redshift as NGC 2770

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