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"

21984 results found.

  1. NGC 2770B has the same redshift as NGC 2770
  2. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  3. optical observations, XRT in NGC 2770
  4. XRF 080109/SN 2008D: PROMPT Optical Imaging
  5. Gemini-South observations of XRF 080109 / SN 2008D
  6. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  7. Discovery of Radio Emission from Transient in NGC 2770
  8. XRF 080109 in NGC2770: NIR observations at TNG
  9. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  10. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  11. XRF 080109 in NGC2770: Detectable Superluminal Motion
  12. XRF in NGC 2770: Search for X-ray periodicity
  13. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
  14. Opticall follow-ups for the X-ray transient in NGC 2770
  15. X-ray transient in NGC 2770: Optical observations with Astrotel-Caucasus
  16. Swift UVOT Observations of the X-ray transient in NGC 2770
  17. Possible XRF in NGC 2770 - NOT observations of the optical counterpart
  18. Bright X-ray Transient (a XRF? ) in NGC 2770 - A SN optical counterpart?
  19. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  20. GRB 071227: optical afterglow
  21. GRB 071227: Magellan redshift confirmation
  22. GRB 071227: VLT probable redshift of the candidate host galaxy
  23. GRB 071227: Magellan observations
  24. GRB071227: Swift/UVOT refined analysis
  25. GRB 071227: REM NIR and Optical observations
  26. GRB071020: optical observations
  27. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  28. GRB 070429B: Probable host galaxy and redshift
  29. GRB 071129: Swift detection of a burst
  30. Konus-Wind and Konus-A observations of GRB 071125
  31. GRB 071112C: Optical/NIR observations
  32. VLA radio detection of GRB 071122
  33. GRB071122: Swift/UVOT Observations
  34. GRB071104: NIR Afterglow Candidate at TNG
  35. GRB 071122: MASTER optical observation
  36. GRB 071122 Swift-XRT refined analysis
  37. GRB 071122: P60 Optical Afterglow Candidate
  38. GRB 071122: ROTSE-III Optical Limits
  39. GRB 071118: P60 Observations
  40. GRB071118 MITSuME OAO optical observation
  41. GRB 071118: Observations from OSN
  42. GRB 071117: VLT observations and probable redshift
  43. Swift/UVOT observations of GRB071118
  44. Konus-Wind and Konus-A observations of GRB 071117
  45. Swift XRT follow-up observations of GRB071008
  46. Swift/UVOT upper limits for GRB 071117
  47. GRB 071117: Gemini Optical Afterglow Discovery
  48. GRB 071118, Swift-BAT refined analysis
  49. GRB 071117: TAROT La Silla observatory optical observations
  50. GRB 071112B: Gemini Image Differencing
  51. GRB 071117: Gemini Observations
  52. GRB 071117: Las Campanas optical observations
  53. VLT FORS2 observations of short hard GRB071112B
  54. GRB 071117: Initial Swift/UVOT observations
  55. GRB 071117: Swift detection of a bright burst
  56. VLA radio upper limit on GRB 071112C
  57. ATCA radio observations of short hard burst GRB 071112B
  58. GRB 071112C: Optical and NIR data observed with KANATA
  59. GRB 071112C: WSRT Radio Observations
  60. GRB 071112C: optical observation
  61. GRB 071112C: Gemini Absorption Redshift
  62. GRB 071112C : Second Epoch Lulin R-band observations
  63. GRB071112C MITSuME Okayama Optical Observation
  64. GRB 071112C: Swift/UVOT observations
  65. GRB 071112C: Optical observations at Crni Vrh
  66. Swift UVOT upper limits of GRB071112B
  67. GRB 071112B: Magellan i-band imaging
  68. GRB 071112B: Gemini Optical Imaging
  69. GRB071112C: NOT observations
  70. GRB 071112C : Lulin R-band observation
  71. GRB 071112C: RTT150 optical observations
  72. GRB 071112C: TAROT Calern observatory optical observations
  73. Swift XRT follow-up observations of GRB071028B
  74. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  75. GRB 071112C: Optical and NIR afterglows observed with KANATA
  76. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  77. GRB071109: Super-LOTIS observations
  78. VLA IInd observation of INTEGRAL burst GRB 071109
  79. GRB 071109: further Swift-XRT analysis
  80. GRB 071109: TAROT Calern observatory optical observations
  81. No radio detection at Swift-XRT position
  82. GRB 071109: Swift-XRT possible X-ray counterpart
  83. VLA prompt radio detection of the INTEGRAL burst 071109
  84. GRB 071109: BOOTES-2 prompt optical observations
  85. Swift XRT and UVOT observations of GRB071028B
  86. GRB071101: Optical and NIR upper limits by KANATA
  87. GRB0711101: Two new source from Xinglong TNT observation
  88. GRB 071101: TAROT Calern observatory optical observations
  89. GRB 071101: Swift XRT position
  90. GRB 071101: BOOTES-2 prompt optical observations
  91. GRB 071101: a nearby galaxy
  92. GRB 071020: MITSuME Akeno optical observations
  93. GRB 071031: REM NIR and Optical observation
  94. GRB 071031, SMARTS afterglow observations
  95. GRB 071031: VLT high-resolution spectroscopy
  96. GRB071025: Optical+NIR observations
  97. GRB 071028: SARA observations of variable source
  98. Swift UVOT upper limits to GRB071028
  99. GRB071028: Xinglong EST V-band upper limit
  100. GRB 071025: Kuiper Telescope 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