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"

32509 results found.

  1. GRB080825B: Swift/UVOT Upper Limits
  2. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  3. Swift-BAT trigger 322590 is not a GRB
  4. VLA non-detection of SGR 0501+4516
  5. Radio Detection of SGR 0501+4516: Retraction
  6. SGR 0501+4516: Decline in Activity
  7. SGR 0501+4516: Proximity to supernova remnant HB9
  8. Enhanced Swift-XRT position of SGR 0501+4516
  9. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  10. GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum
  11. Konus-Wind observation of GRB 080825B
  12. GRB 080825B: Swift-XRT team analysis
  13. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  14. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  15. GRB080825: Afterglow confirmation and redshift estimate
  16. Suzaku ToO Observation of SGR 0501+4516
  17. GRB 080825B - optical counterpart candidate
  18. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  19. Konus-Wind observations of new SGR 0501+4516
  20. Radio Detection of SGR 0501+4516
  21. SGR 0501+4516: MDM Optical Observations
  22. GRB 080822B, Swift-BAT refined analysis
  23. SGR 0501+4516: Astrotel-Caucasus optical observations
  24. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  25. SGR 0501+4516: WSRT Radio Observations
  26. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  27. GRB 080822B: MASTER optical observation
  28. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  29. SGR 0501+4516: optical observations
  30. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  31. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  32. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  33. GRB 080822B: Swift detection of a burst
  34. GRB 080822 (SGR 0501+4516): archival optical observations
  35. New Soft Gamma Repeater 0501+4516 was GRB 080822
  36. GRB080810 - optical observations
  37. GRB080810: optical observations
  38. Radio detection of GRB 080810 with the VLA
  39. GRB 080810: RTT150 optical observations
  40. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  41. GLAST Burst Monitor detection of GRB 080810
  42. GRB 080810: Liverpool and Faulkes North observations
  43. GRB080810: MITSuME optical observation
  44. First GLAST Burst Monitor GRB Circulars
  45. GRB 080810: Swift/UVOT Refined Analysis
  46. GRB 080810: optical observations
  47. GRB 080810: Liverpool Telescope observations
  48. GRB 080810: D50 optical observation
  49. GRB 080810: Kanazawa optical observation
  50. GRB 080810: OSN follow-up
  51. GRB 080810: Observations from NOT
  52. GRB 080810: RTT150 optical observations
  53. GRB 080810: Swift-XRT Team refined analysis
  54. GRB 080810: KANATA optical-NIR observation, update
  55. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  56. GRB 080810: Keck/HIRES Spectroscopy
  57. GRB 080810, Swift-BAT refined analysis
  58. GRB 080810 : optical observation with KANATA
  59. GRB 080723B: GROND upper limits
  60. GRB 080723B: XMM-Newton observation
  61. GRB 080805: VLT redshift update
  62. GRB 080805: Faulkes Telescope South optical observations
  63. GRB 080804: GROND observations
  64. GRB 080727B: Late VLT imaging
  65. GRB 080804: ATCA Radio Observations
  66. GRB 080805: Swift-XRT Refined Analysis
  67. GRB 080805: Swift/UVOT Upper Limits
  68. GRB 080804: Swift-XRT Refined Analysis
  69. GRB 080804: Swift/UVOT Refined Analysis
  70. GRB 080805, Swift-BAT refined analysis
  71. GRB 080804, Swift-BAT refined analysis
  72. GRB080804: Gemini South redshift confirmation
  73. GRB 080804: Faulkes Telescope South observations
  74. GRB 080805: VLT redshift
  75. GRB 080805: Afterglow confirmation
  76. GRB 080805: GROND detection of possible afterglow
  77. GRB 080804: UVES redshift
  78. GRB 080804: ROTSE-III Detection of Optical Counterpart
  79. GRB 080802: Swift/UVOT Upper Limits
  80. GRB 080802: Swift-XRT Refined Analysis
  81. GRB 080802: UVI Telescope Upper Limit
  82. GRB 080802, Swift-BAT refined analysis
  83. GRB 080727C: Suzaku WAM observation of the prompt emission
  84. GRB 080727B: IR photometry
  85. GRB 080727A: Early IR observations
  86. GRB 080727C: TAROT Calern observatory optical observations
  87. GRB 080727B: KAIT photometry and an early lightcurve break
  88. GRB 080727B: GROND redshift limit
  89. GRB 080727C, Swift-BAT refined analysis
  90. GRB 080727C: Swift/UVOT Upper Limits
  91. Konus-Wind observation of GRB 080727B
  92. GRB 080727C: Swift XRT refined analysis
  93. GRB 080727C: Liverpool Telescope observations
  94. GRB 080727A: VLT upper limits
  95. GRB 080727B: REM NIR afterglow prompt detection
  96. GRB080727C: RTT150 optical observations
  97. GRB 080727B: Swift/UVOT Upper Limits
  98. GRB 080727B: Swift-XRT refined analysis
  99. GRB 080727B, Swift-BAT refined analysis
  100. GRB 080727A, Swift-BAT refined analysis

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