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"

20960 results found.

  1. GRB 110709B: Gemini-South optical observations
  2. GRB 110709A : Xinglong TNT upper limit
  3. GRB 110709B: Swift detection of renewed activity at T+11 minutes.
  4. GRB 110708A: Swift/UVOT Observations
  5. GRB 110709A: MASTER-NET optical observations
  6. GRB 110708A: Liverpool Telescope observations
  7. GRB 110708A: Lick observations
  8. Swift J185003.2-005627: 1.23m CAHA and BOOTES-3 observations
  9. GRB 110625A: Fermi GBM and LAT observations
  10. GRB 110625A: Swift/UVOT Upper Limits
  11. GRB 110625A: 1.23m CAHA I-band observations
  12. GRB 110625A: GROND detection of a source inside the XRT error circle
  13. GRB 110625A: Konkoly observations
  14. Swift J185003.2-005627: Swift-XRT/UVOT refined analysis
  15. Swift J185003.2-005627: TAROT La Silla observatory optical observations
  16. Swift J185003.2-005627: TAROT Calern observatory optical observations
  17. GRB 110618A: SMARTS optical observations
  18. GRB 110604A: final update on Swift-XRT observations
  19. GRB 110610A: 1.23m CAHA optical observations
  20. GRB 110610A: Swift/UVOT Upper Limits
  21. GRB 110610A: MASTER-NET optical observations
  22. GRB 110530A: optical observations in Mondy observatory
  23. GRB 110530A: optical observations at Mt. Terskol, second epoch
  24. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  25. GRB 110530A: Xinglong TNT observation
  26. GRB 110530A: NOT optical observations
  27. GRB 110530A: optical observations at Mt. Terskol
  28. GRB 110530A: Correction to GCN Circ 12050
  29. GRB 110530A: MASTER OT observations
  30. LAT Observations of GRB110529A
  31. Swift J1644+57/GRB 110328A, Additional HST Observations
  32. GRB 110521A: Swift/UVOT Upper Limits
  33. GRB 110520A: NOT optical follow-ups
  34. GRB 110521A - NOT optical observation
  35. GRB 110521A: MASTER synchronous and early optical observations limit
  36. Swift/UVOT observations of GRB110520A
  37. GRB 110520A: IAC80 I-band observations
  38. GRB 110520A: WHT IR observations
  39. GRB 110520A - NOT optical observation
  40. GRB 110520A: Skynet/DAO optical observations
  41. GRB 110520A: Liverpool Telescope Observations
  42. GRB 110520A: TAROT Calern observatory optical observations
  43. GRB 110520A: MASTER-NET optical observations
  44. Radio observations of GRB 110428A with the EVLA
  45. GRB 110503A: TAROT Calern observatory optical observations
  46. GRB 110503A: Jet Break seen from TLS
  47. GRB 110503A optical observations
  48. GRB 110422A: Herschel FIR observation preliminary report
  49. GRB 110503A: R-band Detection
  50. GRB 110503A: Centimeter observation from EVLA
  51. GRB 110503A: Millimeter observation from SMA
  52. GRB 110503A: SARA-N Observations and Photometric Calibration
  53. GRB 110503A: Swift/UVOT Observations
  54. GRB 110503A: PAIRITEL NIR Detection
  55. GRB 110503A - TLS Afterglow Observations
  56. GRB 110503A: NOT afterglow photometry
  57. GRB 110503A: Redshift from 10.4m GTC
  58. GRB 110428A : X-ray afterglow confirmation
  59. GRB 110422A: optical observations in CrAO
  60. GRB 110428A : Swift-XRT observations
  61. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  62. GRB 110426A: MAXI/GSC detection of a GRB
  63. GRB 110422A: optical observations in CrAO, second epoch
  64. GRB 110422A: Redshift confirmation from GTC
  65. GRB 110422A: tentative redshift from TNG
  66. GRB 110422A: Herschel observation scheduled
  67. GRB110422A: NOT optical follow-ups
  68. GRB 110422A: optical observations in CrAO
  69. GRB 110422A: Further NOT observation
  70. GRB 110422A: Swift/UVOT Detection of optical afterglow
  71. GRB 110422A: THO optical observations
  72. GRB 110422A: TNG optical observations
  73. GRB 110422A: SAO RAS optical observations
  74. GRB 110422A: MASTER earlier OT polarization observations
  75. GRB 110422A: Mondy optical observations
  76. GRB 110420B: Swift/UVOT Upper Limits
  77. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  78. GRB 110420B: Swift-XRT afterglow candidate retraction
  79. GRB 110420B, GROND observations
  80. GRB 110420A Swift/UVOT Observations
  81. GRB 110414A: GROND upper limits
  82. GRB 110414A: Swift/UVOT Upper limits
  83. GRB 110414A : Faulkes Telescope North observations
  84. GRB 110411A: PAIRITEL NIR Upper Limits
  85. GRB 110411A: optical limits from OSN
  86. GRB 110411A: Swift/UVOT Upper Limits
  87. GRB 110411A: MASTER optical observations
  88. GRB 110328A / Swift J164449.3+573451: R-band Monitoring
  89. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  90. GRB 110407A:VLF observations on 20.27kHz
  91. GRB 110328A / Swift J164449.3+573451: optical observations
  92. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  93. GRB 110407A: MASTER optical observations
  94. GRB110407A: UVOT Upper Limits
  95. GRB 110407A: GROND Detection of the Optical Afterglow
  96. GRB 110407A: NOT optical observations
  97. GRB 110407A : Lulin optical afterglow detection
  98. GRB 110407A: MASTER early optical observations
  99. GRB 110328/Swift J164449.3+573451: Chandra observations
  100. GRB 110402A: LOAO Optical Observation

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