Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

5386 results found.

  1. GRB 120311B: Enhanced Swift-XRT position
  2. GRB 120311B: Swift-XRT observations
  3. GRB 120311B: Swift detection of a burst
  4. GRB 120311A: Swift/UVOT Upper Limits
  5. GRB 120308A : LOAO optical observation
  6. GRB120308A: MITSuME Ishigakijima Optical Upper Limits
  7. GRB 120305A: EVLA deep limit on a radio counterpart
  8. GRB 120305A: MASTER-NET early optical observations
  9. GRB 120211A : LOAO optical observations
  10. GRB 120202A: Swift/XRT and UVOT observations
  11. GRB 120119A : LOAO Optical Observations
  12. GRB 120119A: optical upper limit
  13. GRB 120118B: Faulkes Telescope South observations
  14. AXP 4U 1042+61: Mondy optical observations
  15. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  16. Swift detection of an SGR burst from AXP 4U 0142+61
  17. GRB 120106A: Swift-BAT refined analysis
  18. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  19. GRB 111228A: LOAO Optical Observation
  20. GRB111228A: Further GMG observations
  21. GRB111228A: MITSuME Okayama Optical Observation
  22. GRB 111225A: GRT Optical Observation
  23. GRB 111225A: Swift detection of a burst with an optical counterpart
  24. GRB 111222A: Xinglong TNT observation
  25. GRB 111210A: optical upper limit of Mt. Terskol observatory
  26. GRB111215A: optical upper limit
  27. GRB 111211A: NOT afterglow confirmation
  28. GRB 111210A: Swift detection of a burst
  29. GRB 111209A optical limit by "Pi of the Sky"
  30. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  31. GRB 111123A: optical upper limit in CrAO
  32. XRF 111111A/MAXI J0158-744: MAXI GSC and SSC detection of a soft X-ray transient near SMC
  33. GRB 111109A: Swift/UVOT Photometry
  34. GRB 111109A: Swift-XRT observations
  35. GRB 111107A: GROND observations
  36. GRB 111103A: Fermi GBM observation
  37. GRB 111103B: optical observations from TAU, Ka-Dar
  38. Trigger 506913: MASTER detection of Swift J1922.7-1716 optical counterpart
  39. GRB 111103B: optical observations
  40. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  41. Swift-BAT trigger 506884 is not a GRB
  42. GRB 111029A: Faulkes Telescope North observations
  43. GRB 111022A: Swift detection of a burst
  44. GRB 111008A: Gemini optical counterpart
  45. GRB 111005A: Swift detection of a burst
  46. GRB 111003A: Fermi GBM detection
  47. GRB 110924A: Swift detection of a possible burst
  48. GRB110918A: Lick Observations
  49. GRB 110905A: Swift detection of a burst
  50. GRB 110903A: Fermi GBM observation
  51. GRB 110808A: Swift/UVOT Detection
  52. GRB 110808A: Swift detection of a burst with optical counterpart
  53. GRB 110807A: Swift detection of a burst or a posible new SGR
  54. Fermi GBM trigger 334123030 (110804165) is not a GRB
  55. IPN triangulation of GRB110802A (short/hard burst)
  56. GRB 110801A: optical observations in CrAO
  57. GRB110801A: MITSuME Ishigakijima Optical Observation
  58. AXP 4U 0142+61: Fermi GBM detection
  59. AXP 4U 0142+61: Swift-BAT refined analysis
  60. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  61. GRB 110726A: Swift detection of a burst
  62. Fermi Gamma-ray Burst Monitor trigger 332078586 is not a GRB
  63. GRB110709A: upper limits from CAHA 1.23m and OSN 1.5m
  64. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  65. GRB 110705A: Suzaku WAM observation of the prompt emission
  66. Konus-Wind observation of GRB 110705A
  67. GRB 110705A: Fermi GBM detection
  68. GRB 110625A: GROND detection of a source inside the XRT error circle
  69. GRB110530A: MITSuME Okayama Optical Observation
  70. GRB 110503A: R-band Detection
  71. GRB 110420A: Swift detection of a burst with optical counterpart
  72. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  73. GRB 110407A: MASTER optical observations
  74. GRB 110407A: GROND Detection of the Optical Afterglow
  75. Konus-Wind observation of GRB 110406A
  76. GRB 110328A / Swift J164449.3+573451, HST Observations
  77. GRB 110328A: Konkoly observations.
  78. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  79. GRB 110328/Swift J164449.3+573451: Fermi observations
  80. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  81. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  82. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  83. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  84. GRB 110213A, the review of the sky area in plate archives
  85. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  86. GRB 110319B Swift-XRT afterglow confirmation
  87. GRB 110319B: Swift-XRT afterglow candidate.
  88. GRB 110319B found in ground analysis of Swift-BAT data
  89. GRB 110315A: RTT150 optical observations
  90. GRB 110315A: MASTER early optical observations
  91. GRB110312A: MITSuME Okayama Optical upper limits
  92. GRB110305A: MITSuME Ishigakijima Optical upper limits
  93. GRB 110223A: optical upper limits
  94. GRB 110223A: Liverpool Telescope observations
  95. GRB 110223A: Swift detection of a burst
  96. GRB 110201A: Subaru/MOIRCS Ks-band photometry
  97. GRB 110128A: Swift/UVOT observations
  98. GRB 110128A: WHT redshifts of nearby field galaxies
  99. GRB 110128A: Enhanced Swift-XRT position
  100. GRB 110128A: Afterglow detection from NOT

Advanced

Download all Circulars as a .tar.gz archive:
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