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"

42182 results found.

  1. GRB 080120: GROND confirmation of the optical afterglow
  2. XRF 080109 / SN 2008D: GMRT radio observation at 1280 MHz
  3. GRB 080120: Swift-XRT refined analysis
  4. UVOT detection of GRB080120
  5. GRB 080120: GROND detection
  6. GRB 080120 : Planned XMM-Newton observation
  7. GRB080120: Swift XRT position
  8. GRB 080120: a long GRB detected by INTEGRAL
  9. XRF 080109 / SN 2008D: 1.4 GHz WSRT Radio Observations
  10. Transient in NGC2770 / SN2008D: Metallicity of nearby HII regions
  11. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  12. XRF 080109 / SN 2008D: WSRT Radio Detection
  13. Transient 080109/ SN 2008D, metallicity of the host galaxy
  14. Transient 080109/ SN 2008D, IR Spectrum
  15. XRF 080109 / SN 2008D: optical observations
  16. NGC 2770B has the same redshift as NGC 2770
  17. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  18. XRF 080109 / SN 2008D: spectroscopic evolution
  19. XRF 080109 / SN 2008D: UKIRT JHK imaging
  20. optical observations, XRT in NGC 2770
  21. XRF 080109/SN 2008D: PROMPT Optical Imaging
  22. Gemini-South observations of XRF 080109 / SN 2008D
  23. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  24. Discovery of Radio Emission from Transient in NGC 2770
  25. XRF 080109 in NGC2770: NIR observations at TNG
  26. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  27. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  28. XRF 080109 in NGC2770: Detectable Superluminal Motion
  29. Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
  30. XRF in NGC 2770: Search for X-ray periodicity
  31. Spectroscopic classification of SN 2008D (Transient in NGC 2770)
  32. Refined Swift-XRT analysis of the transient in NGC 2770
  33. Transient in NGC 2770: spectroscopic evidence for a SN
  34. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
  35. Opticall follow-ups for the X-ray transient in NGC 2770
  36. X-ray transient in NGC 2770: Optical observations with Astrotel-Caucasus
  37. Optical Spectroscopy of the Transient in NGC 2770
  38. Swift UVOT Observations of the X-ray transient in NGC 2770
  39. Early OT detection of XRF in NGC 2770 in Asiago frames
  40. Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
  41. Possible XRF in NGC 2770 - NOT observations of the optical counterpart
  42. Bright X-ray Transient (a XRF? ) in NGC 2770 - A SN optical counterpart?
  43. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  44. GRB 071227: Suzaku WAM observation of the prompt emission
  45. GRB 071227: optical afterglow
  46. Further Swift-BAT analysis of GRB 071227
  47. Konus-Wind observation of GRB 071227
  48. GRB 071227: Magellan redshift confirmation
  49. GRB 071227: Swift-XRT refined analysis
  50. GRB 071227: VLT probable redshift of the candidate host galaxy
  51. GRB 071227: Magellan observations
  52. GRB071227: Swift/UVOT refined analysis
  53. GRB 071227: REM NIR and Optical observations
  54. Swift-BAT refined analysis of short GRB 071227
  55. GRB 071227: Swift detection of a burst
  56. GRB071020: optical observations
  57. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  58. Swift-BAT trigger 298308 is not a GRB
  59. GRB 071208?: Swift detection of a possible burst
  60. GRB 071125: Suzaku WAM observation of the prompt emission
  61. GRB 070429B: Probable host galaxy and redshift
  62. GRB 071129, Swift-BAT refined analysis
  63. GRB 071129: Swift detection of a burst
  64. IPN triangulation of very bright GRB 071125
  65. GRB 071112C: Optical/NIR observations
  66. GRB 071126: Enhanced Swift-XRT position
  67. GRB071122: Swift/UVOT Observations
  68. GRB071104: NIR Afterglow Candidate at TNG
  69. GRB 071122: MASTER optical observation
  70. GRB 071122, Swift-BAT refined analysis
  71. GRB 071122 Swift-XRT refined analysis
  72. GRB071122: Gemini Absorption redshift
  73. GRB 071122: P60 Optical Afterglow Candidate
  74. GRB 071122: ROTSE-III Optical Limits
  75. GRB 071122: Swift detection of a burst
  76. GRB 071118: P60 Observations
  77. GRB071118 MITSuME OAO optical observation
  78. GRB 071118: Observations from OSN
  79. GRB 071117: VLT observations and probable redshift
  80. Swift/UVOT observations of GRB071118
  81. GRB 071117: Swift-XRT revised position
  82. Konus-Wind and Konus-A observations of GRB 071117
  83. Swift XRT follow-up observations of GRB071008
  84. GRB071118: Swift XRT refined analysis
  85. GRB 071117: Gemini Optical Afterglow Discovery
  86. GRB 071118, Swift-BAT refined analysis
  87. GRB 071117: TAROT La Silla observatory optical observations
  88. GRB 071112B: Gemini Image Differencing
  89. GRB 071118: Swift detection of a burst
  90. GRB 071117: Gemini Observations
  91. GRB 071117: Las Campanas optical observations
  92. GRB 071117: Swift-XRT refined analysis
  93. GRB 071117, Swift-BAT refined analysis
  94. GRB 071117: Swift/XRT position
  95. GRB 071117: Initial Swift/UVOT observations
  96. GRB 071117: Swift detection of a bright burst
  97. Swift detection of MXB 0656-072
  98. GRB 071112C: Optical and NIR data observed with KANATA
  99. Correction to the Swift-BAT Transient Identification (trigger=296683)
  100. GRB 071112C: WSRT Radio 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