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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"

27392 results found.

  1. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  2. IPN triangulation of GRB030519B=H2716 (small error box)
  3. HETE GRB030329, correction to Rc Observations in Loiano
  4. GRB 030329: Optical limit (contemporaneous imaging)
  5. IPN triangulation of GRB030509 (small errror box)
  6. GRB030329, BVRI photometry
  7. GRB030429, refiend optical brightness
  8. GRB 030329: Optical limit (contemporaneous photography)
  9. GRB030418, BVRcIc field photometry
  10. GRB030429, BVRcIc field photometry
  11. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  12. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  13. GRB030329: RTT150 optical observations and upper limit for a host
  14. GRB030501, optical observation
  15. GRB030501 triangulation (correction to GCN 2194)
  16. GRB030329: RTT150 optical observations and upper limit for a host
  17. GRB 030429: redshift from VLT spectroscopy
  18. GRB030501B triangulation (single error box)
  19. GRB 030329, BVRI photometry
  20. GRB030429: Optical Observations
  21. GRB030501: TAROT candidate afterglow present in archival images
  22. GRB 030429: confirmation of afterglow candidate
  23. GRB 030329 Oprical observations in Rozhen observatory
  24. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  25. IPN triangulation of GRB030425 (single error box)
  26. GRB 030329, the review of the sky area in plate archive (1950-1998)
  27. GRB 030329: optical spectropolarimetry at VLT
  28. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  29. GRB030329: optical polarization
  30. IPN triangulation of GRB030422 (two large error boxes)
  31. GRB030329, optical observation
  32. MASTER:optical observations GRB030418
  33. MASTER:optical observations probable GRB030414
  34. GRB030418: Kiso near infrared observations
  35. GRB 030418: Optical afterglow
  36. OT GRB 030329: early UBVRcIc spectral evolution
  37. OT GRB 030329: early spectrum
  38. IPN triangulation of GRB030414 (small error box)
  39. IPN triangulation of GRB030413 (small error box)
  40. Superluminal motion in GRB 030329 (Correction)
  41. Superluminal motion in GRB 030329
  42. GRB030329, optical position
  43. IPN triangulation of GRB030406 (small error box)
  44. IPN triangulation of GRB050403 (small error box)
  45. GRB 030329: BVRI photometry at Asiago
  46. GRB 030329: VLT V-band photometry
  47. Kiso observation of the GRB030329 at April 6
  48. GRB 030329, color evolution
  49. GRB030328, UBVRcIc field photometry
  50. GRB 030329 Optical observations
  51. GRB030329: Kiso B and R band observations
  52. GRB030328: R upper limit after 6 hours by MASTER
  53. SDSS 0.5m PT observations of GRB030329 (correction)
  54. SDSS 0.5m PT observations of GRB030329
  55. GRB030329: final R-band light curve by MASTER
  56. GRB030329, optical observation
  57. GRB030329, new UBVRcIc field photometry
  58. GRB 030329, light curve and SN prediction
  59. GRB 030329, BRI photometry
  60. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  61. GRB030329: Optical observations at Teramo
  62. GRB 030329: Radio observations at GMRT
  63. Further AAVSO V,B,R observations of GRB030329
  64. GRB 030329: Additional Mt. Laguna Optical Observations
  65. GRB 030329: Observations with ANDICAM
  66. GRB030329: further optical photometry and evidence for a light curve discontinuity
  67. triangulation of GRB 030331 (single error box)
  68. GRB 030329: optical observations
  69. Photometry of GRB030329 - Constant OT Magnitude
  70. GRB030329 - OT brightens
  71. GRB 030329, optical photometry
  72. GRB 030324: Optical and NIR Observations
  73. GRB030329: R band light curve by MASTER
  74. GRB030329 - Light curve flattening
  75. GRB 030324, optical search
  76. GRB 030329, optical observations
  77. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  78. GRB030329a: detection by Konus-Wind
  79. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  80. GRB030329, BVRcIc field photometry
  81. GRB030329, SPM optical observations
  82. GRB 030329: Optical decay and synthesis
  83. GRB030329 optical observations
  84. GRB 030329: Optical pre-Imaging
  85. GRB 030329: Upper limit from 5.6 hours before trigger
  86. GRB030328: X-ray Afterglow Observed with Chandra
  87. GRB 030329, R-band observations
  88. GRB 030329: OT B and R photometry, decline rate
  89. GRB030329: Upper limits from recent and historical observations.
  90. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  91. GRB 030329: Optical Afterglow Observations
  92. GRB 030328: optical observations
  93. GRB 030329: Optical afterglow fading
  94. GRB 030328: OT photometry
  95. GRB030328: optical spectroscopy at TNG
  96. GRB030328: optical photometry at the TNG
  97. VLT spectra of GRB 030328
  98. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  99. GRB 030328: Optical observations
  100. GRB030324 optical observation

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