Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

15380 results found.

  1. GRB 081028: TAROT Calern observatory optical observations
  2. GRB 081028: optical observations at the NOT
  3. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  4. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  5. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  6. GRB081025: RTT150 optical observations
  7. GRB081024B: P200 Observations
  8. GRB 081025 BAT refined analysis
  9. Swift UVOT observations of GRB081025
  10. Konus-Wind observation of GRB 081025
  11. GRB 081025: Burst detection from Swift-BAT slew data
  12. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  13. Fermi-LAT observation of GRB 081024B
  14. Swift UVOT observations of GRB 081024
  15. GRB 081024: Faulkes Telescope North optical observations
  16. Swift trigger 332287 is not a GRB
  17. Swift detection of a possible burst (trigger 332287)
  18. GRB 081017: REM early observations
  19. GRB 081011: Swift XRT refined analysis
  20. GRB 081016: A long GRB discovered by INTEGRAL
  21. Detection of flare star Algol in Swift-BAT slew data
  22. GRB 081009: Fermi GBM detection
  23. GRB 081008: Galaxy associated with z=1.967 absorber
  24. GRB 081012: Fermi GBM detection
  25. GRB 081007 and GRB 081007B: Fermi GBM detection
  26. GRB 081008 optical upper limit
  27. GRB 081012: Observations from NOT
  28. GRB 081012: Swift/UVOT analysis of initial observations
  29. Konus-Wind observation of GRB 081001
  30. GRB 081008: VLT redshift confirmation
  31. GRB081008: Swift/UVOT observations
  32. GRB 081007: Early RAPTOR measurements of optical counterpart
  33. GRB 081007, Faulkes Telescope North optical observations
  34. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  35. GRB 081001: Further observations from OSN
  36. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  37. GRB 081003B: a long GRB detected with INTEGRAL
  38. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  39. GRB 081003: A long GRB discovered by INTEGRAL
  40. GRB 081001: Observations from OSN
  41. GRB 080925: Suzaku WAM observation of the prompt emission
  42. GRB 081001: Swift UVOT Observations
  43. GRB081001: SuperAGILE Localization of a long GRB
  44. GRB080928: redshift retraction
  45. GRB 080928: Watcher observations
  46. GRB 080928: VLT redshift
  47. GRB 080928: GROND DETECTION
  48. GRB 080920: Fermi GBM detection
  49. GRB080922, optical upper limit
  50. GRB080916A: Suzaku WAM observation of the prompt emission
  51. GRB080922: A long GRB detected by INTEGRAL
  52. GRB 080913B: Fermi GBM detection
  53. Trigger 324561: IGR J08408-4503 detected by Swift
  54. GRB 080916C: GROND Confirmation of the Optical Afterglow
  55. GRB 080916C: GROND Confirmation of the Optical Afterglow
  56. GRB 080919: REM NIR observations
  57. GRB080913: Swift-BAT spectral lag
  58. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  59. GRB 080916A: Fermi GBM detection
  60. GRB 080916C: Swift UVOT Refined Analysis
  61. GRB 080916C: Swift XRT refined analysis
  62. Konus-Wind observation of GRB 080916A
  63. Konus-Wind observation of GRB 080916C
  64. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  65. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  66. GRB 080916B: Swift UVOT Refined Analysis
  67. IPN Triangulation and Energy Spectrum of GRB080916C
  68. GRB080916A: Refined Swift/UVOT Observations
  69. GRB 080915a, SMARTS optical/IR observations
  70. GRB 080916C: Fermi LAT observation
  71. SGR 0501+4516 : P200 i-band observations
  72. GRB 080913: Swift-XRT refined analysis
  73. GRB 080913: GROND photo-z
  74. GRB 080913: VLT/FORS2 observations
  75. GRB 080913: REM NIR early observations
  76. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  77. GRB 080906: Watcher observations
  78. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  79. GRB 080905C: Fermi GBM detection
  80. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  81. Swift trigger 324362 (LS I +61 303 ?): XRT
  82. Swift trigger 324362 (LS I +61 303 ?)
  83. GRB 080905B: Watcher optical detection
  84. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  85. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  86. Swift Trigger 324116 is known source again
  87. Swift Trigger 324112 is known source Swift J1842.5-1124
  88. GRB 080906: Refined Swift/UVOT Observations
  89. GRB 080906: GROND observations of the optical/NIR afterglow
  90. GRB 080905B: Refined UVOT Analysis
  91. GRB 080905B: VLT redshift
  92. GRB 080825C: Fermi GBM Spectral Analysis
  93. GRB 080905: Swift detection of a probably-short burst
  94. GRB 080903: Liverpool Telescope observations
  95. Recent VLA non-detection of SGR 0501+4516
  96. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  97. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  98. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  99. nIR observations of SGR 0501+4516
  100. SGR 0501+4516: Confirmation of the NIR counterpart

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