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"

5401 results found.

  1. GRB 120327A: Liverpool Telescope Observations
  2. GRB 120326A: optical observation of GMG
  3. GRB 120326A: T17 optical observations
  4. GRB 120326A: CQUEAN grizY Observation
  5. GRB 120323A: MASTER follow up observations
  6. IPN Triangulation of GRB 120323A (short/very intense)
  7. GRB 120324A: CQUEAN rizY Observation
  8. GRB 120320A: MITSuME Okayama Optical upper limits
  9. GRB 120320A , optical observations
  10. GRB 120320A: MASTER optical observations
  11. GRB 120311B: Optical follow-up
  12. GRB 120311A: C88 optical limits
  13. GRB 120312A: MASTER-NET optical observations
  14. GRB 120311B: C88 optical limits
  15. GRB 120311B: MITSuME Okayama Optical upper limits
  16. GRB 120311B: Enhanced Swift-XRT position
  17. GRB 120311B: Swift-XRT observations
  18. GRB 120311B: Swift detection of a burst
  19. GRB 120311A: Swift/UVOT Upper Limits
  20. GRB 120308A : LOAO optical observation
  21. GRB120308A: MITSuME Ishigakijima Optical Upper Limits
  22. GRB 120305A: EVLA deep limit on a radio counterpart
  23. GRB 120305A: MASTER-NET early optical observations
  24. GRB 120211A : LOAO optical observations
  25. GRB 120202A: Swift/XRT and UVOT observations
  26. GRB 120119A : LOAO Optical Observations
  27. GRB 120119A: optical upper limit
  28. GRB 120118B: Faulkes Telescope South observations
  29. AXP 4U 1042+61: Mondy optical observations
  30. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  31. Swift detection of an SGR burst from AXP 4U 0142+61
  32. GRB 120106A: Swift-BAT refined analysis
  33. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  34. GRB 111228A: LOAO Optical Observation
  35. GRB111228A: Further GMG observations
  36. GRB111228A: MITSuME Okayama Optical Observation
  37. GRB 111225A: GRT Optical Observation
  38. GRB 111225A: Swift detection of a burst with an optical counterpart
  39. GRB 111222A: Xinglong TNT observation
  40. GRB 111210A: optical upper limit of Mt. Terskol observatory
  41. GRB111215A: optical upper limit
  42. GRB 111211A: NOT afterglow confirmation
  43. GRB 111210A: Swift detection of a burst
  44. GRB 111209A optical limit by "Pi of the Sky"
  45. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  46. GRB 111123A: optical upper limit in CrAO
  47. XRF 111111A/MAXI J0158-744: MAXI GSC and SSC detection of a soft X-ray transient near SMC
  48. GRB 111109A: Swift/UVOT Photometry
  49. GRB 111109A: Swift-XRT observations
  50. GRB 111107A: GROND observations
  51. GRB 111103A: Fermi GBM observation
  52. GRB 111103B: optical observations from TAU, Ka-Dar
  53. Trigger 506913: MASTER detection of Swift J1922.7-1716 optical counterpart
  54. GRB 111103B: optical observations
  55. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  56. Swift-BAT trigger 506884 is not a GRB
  57. GRB 111029A: Faulkes Telescope North observations
  58. GRB 111022A: Swift detection of a burst
  59. GRB 111008A: Gemini optical counterpart
  60. GRB 111005A: Swift detection of a burst
  61. GRB 111003A: Fermi GBM detection
  62. GRB 110924A: Swift detection of a possible burst
  63. GRB110918A: Lick Observations
  64. GRB 110905A: Swift detection of a burst
  65. GRB 110903A: Fermi GBM observation
  66. GRB 110808A: Swift/UVOT Detection
  67. GRB 110808A: Swift detection of a burst with optical counterpart
  68. GRB 110807A: Swift detection of a burst or a posible new SGR
  69. Fermi GBM trigger 334123030 (110804165) is not a GRB
  70. IPN triangulation of GRB110802A (short/hard burst)
  71. GRB 110801A: optical observations in CrAO
  72. GRB110801A: MITSuME Ishigakijima Optical Observation
  73. AXP 4U 0142+61: Fermi GBM detection
  74. AXP 4U 0142+61: Swift-BAT refined analysis
  75. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  76. GRB 110726A: Swift detection of a burst
  77. Fermi Gamma-ray Burst Monitor trigger 332078586 is not a GRB
  78. GRB110709A: upper limits from CAHA 1.23m and OSN 1.5m
  79. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  80. GRB 110705A: Suzaku WAM observation of the prompt emission
  81. Konus-Wind observation of GRB 110705A
  82. GRB 110705A: Fermi GBM detection
  83. GRB 110625A: GROND detection of a source inside the XRT error circle
  84. GRB110530A: MITSuME Okayama Optical Observation
  85. GRB 110503A: R-band Detection
  86. GRB 110420A: Swift detection of a burst with optical counterpart
  87. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  88. GRB 110407A: MASTER optical observations
  89. GRB 110407A: GROND Detection of the Optical Afterglow
  90. Konus-Wind observation of GRB 110406A
  91. GRB 110328A / Swift J164449.3+573451, HST Observations
  92. GRB 110328A: Konkoly observations.
  93. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  94. GRB 110328/Swift J164449.3+573451: Fermi observations
  95. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  96. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  97. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  98. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  99. GRB 110213A, the review of the sky area in plate archives
  100. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits

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