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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"

28083 results found.

  1. GRB030429, BVRcIc field photometry
  2. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  3. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  4. GRB030329: RTT150 optical observations and upper limit for a host
  5. GRB030501, optical observation
  6. GRB030501 triangulation (correction to GCN 2194)
  7. GRB030329: RTT150 optical observations and upper limit for a host
  8. GRB 030429: redshift from VLT spectroscopy
  9. GRB030501B triangulation (single error box)
  10. GRB 030329, BVRI photometry
  11. GRB030429: Optical Observations
  12. GRB030501: TAROT candidate afterglow present in archival images
  13. GRB 030429: confirmation of afterglow candidate
  14. GRB 030329 Oprical observations in Rozhen observatory
  15. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  16. IPN triangulation of GRB030425 (single error box)
  17. GRB 030329, the review of the sky area in plate archive (1950-1998)
  18. GRB 030329: optical spectropolarimetry at VLT
  19. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  20. GRB030329: optical polarization
  21. IPN triangulation of GRB030422 (two large error boxes)
  22. GRB030329, optical observation
  23. MASTER:optical observations GRB030418
  24. MASTER:optical observations probable GRB030414
  25. GRB030418: Kiso near infrared observations
  26. GRB 030418: Optical afterglow
  27. OT GRB 030329: early UBVRcIc spectral evolution
  28. OT GRB 030329: early spectrum
  29. IPN triangulation of GRB030414 (small error box)
  30. IPN triangulation of GRB030413 (small error box)
  31. Superluminal motion in GRB 030329 (Correction)
  32. Superluminal motion in GRB 030329
  33. GRB030329, optical position
  34. IPN triangulation of GRB030406 (small error box)
  35. IPN triangulation of GRB050403 (small error box)
  36. GRB 030329: BVRI photometry at Asiago
  37. GRB 030329: VLT V-band photometry
  38. Kiso observation of the GRB030329 at April 6
  39. GRB 030329, color evolution
  40. GRB030328, UBVRcIc field photometry
  41. GRB 030329 Optical observations
  42. GRB030329: Kiso B and R band observations
  43. GRB030328: R upper limit after 6 hours by MASTER
  44. SDSS 0.5m PT observations of GRB030329 (correction)
  45. SDSS 0.5m PT observations of GRB030329
  46. GRB030329: final R-band light curve by MASTER
  47. GRB030329, optical observation
  48. GRB030329, new UBVRcIc field photometry
  49. GRB 030329, light curve and SN prediction
  50. GRB 030329, BRI photometry
  51. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  52. GRB030329: Optical observations at Teramo
  53. GRB 030329: Radio observations at GMRT
  54. Further AAVSO V,B,R observations of GRB030329
  55. GRB 030329: Additional Mt. Laguna Optical Observations
  56. GRB 030329: Observations with ANDICAM
  57. GRB030329: further optical photometry and evidence for a light curve discontinuity
  58. triangulation of GRB 030331 (single error box)
  59. GRB 030329: optical observations
  60. Photometry of GRB030329 - Constant OT Magnitude
  61. GRB030329 - OT brightens
  62. GRB 030329, optical photometry
  63. GRB 030324: Optical and NIR Observations
  64. GRB030329: R band light curve by MASTER
  65. GRB030329 - Light curve flattening
  66. GRB 030324, optical search
  67. GRB 030329, optical observations
  68. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  69. GRB030329a: detection by Konus-Wind
  70. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  71. GRB030329, BVRcIc field photometry
  72. GRB030329, SPM optical observations
  73. GRB 030329: Optical decay and synthesis
  74. GRB030329 optical observations
  75. GRB 030329: Optical pre-Imaging
  76. GRB 030329: Upper limit from 5.6 hours before trigger
  77. GRB030328: X-ray Afterglow Observed with Chandra
  78. GRB 030329, R-band observations
  79. GRB 030329: OT B and R photometry, decline rate
  80. GRB030329: Upper limits from recent and historical observations.
  81. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  82. GRB 030329: Optical Afterglow Observations
  83. GRB 030328: optical observations
  84. GRB 030329: Optical afterglow fading
  85. GRB 030328: OT photometry
  86. GRB030328: optical spectroscopy at TNG
  87. GRB030328: optical photometry at the TNG
  88. VLT spectra of GRB 030328
  89. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  90. GRB 030328: Optical observations
  91. GRB030324 optical observation
  92. GRB030131, BVRcIc field photometry
  93. Possible GRB030323 localized by INTEGRAL
  94. GRB030323: Detection on 2003/03/24
  95. IPN triangulation of GRB030326 (single small error box)
  96. IPN triangulation of GRB030325 (two small error boxes)
  97. GRB030323: V, R, I photometry
  98. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  99. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  100. VLT/FORS2 spectra of GRB 030323

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