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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"

28124 results found.

  1. XRF030723 Radio Observations
  2. XRF030723(=H2777): Chandra Observations
  3. XRF 030723: VLT spectra
  4. GRB030725, possible optical transient
  5. XRF030723: Palomar observations and proposed counterpart
  6. XRF 030723, optical observations
  7. Konus-Wind detection of the bursts from SGR1806-20 region
  8. GRBlog: Compilation of all GCN Circ. data
  9. IPN detection of renewed activity from SGR1806-20
  10. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  11. GRB030329: second XMM-Newton observation
  12. GRB030418: R optical observations
  13. HETE detection of burst from SGR1806-20
  14. GRB 021206, Radio afterglow candidate
  15. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  16. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  17. GRB 030528: Optical Observations
  18. GRB 030528: tentative NIR counterpart
  19. GRB030329, further radio observations at GMRT
  20. GRB 030519B: optical observations.
  21. GRB 030329: optical observations
  22. GRB 030329: Correction to GCN 2254
  23. GRB 030329: Optical Observations
  24. GRB 021004: HST observations
  25. GRB030324: Further Observations of the Candidate Optical Afterglow
  26. GRB 030418: Second Epoch Optical Observations with Magellan
  27. GRB 030329: Optical limit (contemporaneous imaging)
  28. GRB030329: RTT150 optical observations
  29. GRB 030329: Optical limit (contemporaneous photography)
  30. GRB 030429: Redshift of neighbor galaxy
  31. GRB030429: RTT150 optical observations, a possible host galaxy
  32. GRB030329: RTT150 optical observations and upper limit for a host
  33. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  34. GRB030329: RTT150 optical observations and upper limit for a host
  35. GRB 030429: redshift from VLT spectroscopy
  36. GRB 030429: IR photometry with IRSF/SIRIUS
  37. GRB 030329 Optical Observations
  38. GRB030501: TAROT candidate afterglow present in archival images
  39. GRB 030429: confirmation of afterglow candidate
  40. GRB030501 localized by INTEGRAL
  41. GRB 030329 Oprical observations in Rozhen observatory
  42. GRB 030324: Radio Observations
  43. GRB030329 observed as a sudden ionospheric disturbance (SID)
  44. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  45. GRB 030329: Spectral Evolution of SN 2003dh
  46. Optical Observations of GRB 030418 with Magellan
  47. GRB 030329: optical spectropolarimetry at VLT
  48. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  49. GRB030418: Kiso near infrared observations
  50. GRB 030418: Optical afterglow
  51. GRB 030418: Finder for afterglow candidate
  52. GRB 030418: Optical afterglow candidate
  53. GRB030329, UBVRI polarimetry, R-polarization
  54. GRB 030329: SARA Optical Observations
  55. OT GRB 030329: early spectrum
  56. GRB030329: VR Photometry at TNG
  57. GRB030324: Candidate Optical Afterglow (Erratum)
  58. GRB030324: Candidate Optical Afterglow
  59. GRB 030329 Rc observations
  60. Superluminal motion in GRB 030329 (Correction)
  61. Superluminal motion in GRB 030329
  62. GRB 030329 and SN 2003dh
  63. GRB 030329 VLBA Observations
  64. GRB 030329: BVRI photometry at Asiago
  65. GRB 030329: Supernova Confirmed
  66. GRB030329: RTT150 optical observations
  67. GRB030329: Near Infrared Observations at Gunma
  68. Kiso observation of the GRB030329 at April 6
  69. GRB 030329 Optical observations
  70. GRB 030329, color evolution
  71. GRB 030329: possible color change
  72. GRB030329: RTT150 optical observations
  73. GRB 030329: Supernova Spectrum Emerging
  74. GRB030329: Kiso B and R band observations
  75. GRB030329: RTT150 optical observation
  76. GRB 030329: SARA Optical Observations
  77. GRB 030329: SARA Optical Observations
  78. GRB030329, fading resumes
  79. GRB 030329, Optical observations
  80. GRB 030329, nearby galaxies
  81. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  82. GRB 030329: Sub-millimeter detection
  83. GRB 030329: SARA Optical Observations
  84. GRB 030329: SARA Optical Observations
  85. GRB030329, new UBVRcIc field photometry
  86. GRB 030329, light curve and SN prediction
  87. GRB030329: optical observations at Tokyo Tech
  88. GRB 030329: optical observations
  89. GRB030329: multiple re-brightening phases
  90. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  91. GRB 030329 , SPM optical observations
  92. GRB 030329: Radio observations at GMRT
  93. Further AAVSO V,B,R observations of GRB030329
  94. GRB 030329: SARA Optical Observations
  95. GRB 030329: Observations with ANDICAM
  96. GRB030329: further optical photometry and evidence for a light curve discontinuity
  97. GRB 030329: fitting parameters and re-brightening
  98. GRB 030329: KAIT optical photometry
  99. GRB030329 Further RBO Optical Observations
  100. GRB 030329: SARA Optical Observations

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