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"

20512 results found.

  1. GRB 080916C: IRSF/SIRUS NIR Observation
  2. GRB 080916C: GROND Confirmation of the Optical Afterglow
  3. GRB 080916C: GROND Confirmation of the Optical Afterglow
  4. GRB 080919: REM NIR observations
  5. GRB 080919: Swift detection of a short burst
  6. GRB 080915A: GROND upper limits
  7. GRB 080916A: GROND lightcurve
  8. GRB 080916C: Swift UVOT Refined Analysis
  9. GRB 080916C: Swift XRT refined analysis
  10. Konus-Wind observation of GRB 080916C
  11. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  12. GRB080916A: Spectroscopic redshift
  13. GRB 080916C: Swift/XRT detection of possible afterglow
  14. GRB 080916B: Swift UVOT Refined Analysis
  15. GRB 080916B, Swift-BAT refined analysis
  16. GRB080916A: Refined Swift/UVOT Observations
  17. GRB 080915a, SMARTS optical/IR observations
  18. GRB 080916B: Enhanced Swift-XRT position
  19. GRB 080916C: Fermi LAT observation
  20. GRB 080916A: Swift XRT refined analysis
  21. GRB 080916B: Swift-XRT afterglow detection
  22. GRB 080916A: Enhanced Swift-XRT position
  23. GRB 080916: REM detection of the NIR afterglow
  24. GRB 080916: REM candidate afterglow
  25. GRB 080916: Swift detection of a burst with optical afterglow
  26. GRB 080915: REM NIR early observations
  27. GRB 080915: Swift/UVOT Upper Limits
  28. GRB 080915, Swift-BAT refined analysis
  29. GRB 080913: Swift-XRT refined analysis
  30. GRB080913: Swift/UVOT Upper Limits
  31. GRB 080913: VLT/FORS2 observations
  32. GRB 080913: REM NIR early observations
  33. GRB 080913: Enhanced Swift-XRT position
  34. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  35. GRB 080913: Swift detection of a burst
  36. GRB 080906: Watcher observations
  37. GRB 080906B: Fermi GBM detection
  38. GRB 080905C: Fermi GBM detection
  39. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  40. Swift trigger 324362 (LS I +61 303 ?)
  41. GRB080905A: Swift/UVOT Upper Limits
  42. GRB 080905B: Watcher optical detection
  43. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  44. GRB 080905A: MITSuME Akeno optical upper limits
  45. GRB 080906: Refined Swift/UVOT Observations
  46. GRB 080906: Swift-XRT Refined Analysis
  47. GRB 080905A: optical afterglow
  48. GRB 080906: GROND observations of the optical/NIR afterglow
  49. GRB 080905B: Refined UVOT Analysis
  50. GRB 080905B: VLT redshift
  51. GRB 080905A: NOT and VLT observations
  52. GRB 080905B: Enhanced Swift-XRT position
  53. GRB 080906: Swift detection of a burst with optical afterglow
  54. GRB080825C: Fermi-LAT observations
  55. GRB 080905B: Swift detection of a burst with possible optical counterpart
  56. GRB 080905: Swift detection of a probably-short burst
  57. GRB 080903: Swift/UVOT Observations
  58. GRB 080903: Swift-XRT Refined Analysis
  59. GRB 080903: Enhanced Swift-XRT position
  60. GRB 080903: optical observations
  61. GRB 080903: Liverpool Telescope observations
  62. GRB 080903: Optical afterglow candidate
  63. GRB 080903: TAROT Calern observatory optical observations
  64. GRB 080903: Swift detection of a burst
  65. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  66. SGR 0501+4516: Confirmation of the NIR counterpart
  67. GRB080828: Swift/UVOT Upper Limits
  68. SGR 0501+4516: Detection of possible optical counterpart
  69. GRB080825B: Swift/UVOT Upper Limits
  70. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  71. Swift-BAT trigger 322590 is not a GRB
  72. Swift trigger 322590: BAT detection of a possible burst
  73. Enhanced Swift-XRT position of SGR 0501+4516
  74. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  75. GRB 080825B: Swift-XRT team analysis
  76. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  77. Suzaku ToO Observation of SGR 0501+4516
  78. Konus-Wind observations of new SGR 0501+4516
  79. SGR 0501+4516: Astrotel-Caucasus optical observations
  80. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  81. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  82. SGR 0501+4516: optical observations
  83. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  84. GRB 080822: Swift detection of a short burst
  85. GLAST Burst Monitor detection of GRB080816
  86. GRB080810 - optical observations
  87. Radio detection of GRB 080810 with the VLA
  88. First GLAST Burst Monitor GRB Circulars
  89. GRB 080810: Swift/UVOT Refined Analysis
  90. GRB 080810: Liverpool Telescope observations
  91. GRB 080810: Kanazawa optical observation
  92. GRB 080810: OSN follow-up
  93. GRB 080810: Enhanced Swift-XRT position
  94. GRB 080810: KANATA optical-NIR observation, update
  95. GRB 080810 : optical observation with KANATA
  96. GRB 080810: Swift detection of a burst with a bright optical afterglow
  97. GRB 080723B: GROND upper limits
  98. GRB 080805: Faulkes Telescope South optical observations
  99. GRB 080804: GROND observations
  100. GRB 080727B: Late VLT imaging

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