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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"

21263 results found.

  1. XMM-Newton Images of GRB 040223
  2. GRB 040223, VLA observations
  3. GRB 040223: REM IJK Observations
  4. GRB 040223 XMM-Newton observation ...
  5. GRB 031203 XMM-Newton observation
  6. GRB031111, optical observations
  7. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  8. GRB040106: refined X-ray transient position
  9. GRB040106, Radio Observations
  10. GRB040106, likely optical afterglow
  11. GRB 031220: Optical observations of Chandra X-ray sources
  12. XMM-Newton Images of GRB 040106
  13. GRB031220: observation at Univercity of Miyazaki
  14. XMM-Newton observation of GRB040106
  15. IPN triangulation of an intermediate burst from SGR1806-20
  16. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  17. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  18. GRB031220: Palomar Observations
  19. GRB 031220 : Kyoto Optical Observation
  20. GRB 031220: Subaru observation
  21. GRB 031220: Optical observation at Tokyo Tech
  22. GRB 2974 follow-up observations
  23. GRB031203, improved XMM position
  24. GRB 031203: SMARTS optical monitoring
  25. XMM-Newton Observations of GRB031203: Preliminary Images
  26. GRB 031203: Optical/IR Astrometry
  27. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  28. XMM-Newton Observation of GRB031203
  29. XMM-Newton Observation of GRB031203
  30. GRB 031203: IR NTTobservations do not confirm REM detection
  31. GRB031203 : Optical Observation of Lulin Observatory
  32. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  33. GRB031203: Planned XMM-Newton observation II
  34. GRB 031203: IR REM Observations
  35. GRB031203: Optical Observations
  36. GRB 031203 XMM-Newton observation
  37. GRB 031203: Optical/IR SMARTS Observations
  38. GRB031203: Planned XMM-Newton observation
  39. GRB 030329: Planned XMM-Newton Observation
  40. GRB 031111B (= H2925) : Kyoto Optical Observation
  41. GRB 031111, Radio observations
  42. IPN triangulation of GRB031114 (large error box)
  43. GRB 031111, optical observations
  44. IPN triangulation of GRB031108 (large error box)
  45. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  46. GRB030929/SN2003jd association unlikely based on IPN localiztion
  47. Lulin optical follow-up observations of GRB031026
  48. IPN triangulation of GRB031024 (single error box)
  49. IPN triangulation of GRB031024 (annulus)
  50. XRF 030824: additional observations at CFHT
  51. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  52. IPN triangulation of GRB031007 (two large error boxes)
  53. XRF 030723: Subaru Optical Observations
  54. XRF 030824: Early follow-up observation at Kiso observatory
  55. XRF 030723: Detection of the likely host galaxy
  56. IPN triangulation of GRB030921 (large error box)
  57. GRB030913: Subaru Optical Observations
  58. GRB 030913, optical candidate
  59. GRB 030913, BOOTES observations
  60. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  61. XRF030824: Optical observations
  62. IPN triangulation of GRB030827 (large error box)
  63. GRB030823: optical observation at Tokyo Tech
  64. Lulin follow-up observations of GRB030823
  65. IPN triangulation of GRB030821 (=H2814; refined error box)
  66. GRB 030817 = H2808 TAROT optical observations
  67. SGR 1808-20 (=H2802): A Possible new SGR
  68. IPN triangulation of GRB030806 (large burst; large error box)
  69. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  70. IPN/HETE summary of recent bursts from SGR1806-20
  71. XRF030723, BVRcIc field photometry update
  72. GRB021206 optical counterpart upper limit
  73. IPN triangulation of GRB030725 (=H2779; small error box)
  74. XRF030723 Radio Observations
  75. XRF 030723: confirmation of fading optical counterpart
  76. XRF030723(=H2777): Chandra Observations
  77. GRB030723: Upper limits from historical observations
  78. XRF030723: Palomar observations and proposed counterpart
  79. GRB030725 (=H2779): A Bright GRB Localized by HETE
  80. XRF030723, BVRcIc field photometry correction
  81. XRF030723, ROTSE-III Early Observations
  82. XRF030723, BVRcIc field photometry
  83. XRF 030723, optical observations
  84. XRF030723, optical observations
  85. Konus-Wind detection of the bursts from SGR1806-20 region
  86. SGR 1806-20, submm observations
  87. RXTE PCA Observations of SGR1806-20 Region
  88. IPN triangulation of GRB030714 (two large error boxes)
  89. IPN triangulation of GRB030715 (two large error boxes)
  90. GRBlog: Compilation of all GCN Circ. data
  91. GRB030329, optical observation in May
  92. IPN triangulation of GRB030626 (single large error box)
  93. IPN triangulation of GRB030626 (two large error boxes)
  94. GRB030329 -- RATAN-600 data in April-May
  95. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  96. IPN triangulation of GRB030606 (two alternate error boxes)
  97. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  98. IPN triangulation of GRB030605B (annulus)
  99. GRB 030528: tentative NIR counterpart
  100. GRB 030528, radio observations

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