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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"

27391 results found.

  1. IPN triangulation of GRB030519B=H2716 (small error box)
  2. HETE GRB030329, correction to Rc Observations in Loiano
  3. GRB 030329: Optical limit (contemporaneous imaging)
  4. IPN triangulation of GRB030509 (small errror box)
  5. GRB030329, BVRI photometry
  6. GRB030429, refiend optical brightness
  7. GRB 030329: Optical limit (contemporaneous photography)
  8. GRB030418, BVRcIc field photometry
  9. GRB030429, BVRcIc field photometry
  10. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  11. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  12. GRB030329: RTT150 optical observations and upper limit for a host
  13. GRB030501, optical observation
  14. GRB030501 triangulation (correction to GCN 2194)
  15. GRB030329: RTT150 optical observations and upper limit for a host
  16. GRB 030429: redshift from VLT spectroscopy
  17. GRB030501B triangulation (single error box)
  18. GRB 030329, BVRI photometry
  19. GRB030429: Optical Observations
  20. GRB030501: TAROT candidate afterglow present in archival images
  21. GRB 030429: confirmation of afterglow candidate
  22. GRB 030329 Oprical observations in Rozhen observatory
  23. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  24. IPN triangulation of GRB030425 (single error box)
  25. GRB 030329, the review of the sky area in plate archive (1950-1998)
  26. GRB 030329: optical spectropolarimetry at VLT
  27. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  28. GRB030329: optical polarization
  29. IPN triangulation of GRB030422 (two large error boxes)
  30. GRB030329, optical observation
  31. MASTER:optical observations GRB030418
  32. MASTER:optical observations probable GRB030414
  33. GRB030418: Kiso near infrared observations
  34. GRB 030418: Optical afterglow
  35. OT GRB 030329: early UBVRcIc spectral evolution
  36. OT GRB 030329: early spectrum
  37. IPN triangulation of GRB030414 (small error box)
  38. IPN triangulation of GRB030413 (small error box)
  39. Superluminal motion in GRB 030329 (Correction)
  40. Superluminal motion in GRB 030329
  41. GRB030329, optical position
  42. IPN triangulation of GRB030406 (small error box)
  43. IPN triangulation of GRB050403 (small error box)
  44. GRB 030329: BVRI photometry at Asiago
  45. GRB 030329: VLT V-band photometry
  46. Kiso observation of the GRB030329 at April 6
  47. GRB 030329, color evolution
  48. GRB030328, UBVRcIc field photometry
  49. GRB 030329 Optical observations
  50. GRB030329: Kiso B and R band observations
  51. GRB030328: R upper limit after 6 hours by MASTER
  52. SDSS 0.5m PT observations of GRB030329 (correction)
  53. SDSS 0.5m PT observations of GRB030329
  54. GRB030329: final R-band light curve by MASTER
  55. GRB030329, optical observation
  56. GRB030329, new UBVRcIc field photometry
  57. GRB 030329, light curve and SN prediction
  58. GRB 030329, BRI photometry
  59. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  60. GRB030329: Optical observations at Teramo
  61. GRB 030329: Radio observations at GMRT
  62. Further AAVSO V,B,R observations of GRB030329
  63. GRB 030329: Additional Mt. Laguna Optical Observations
  64. GRB 030329: Observations with ANDICAM
  65. GRB030329: further optical photometry and evidence for a light curve discontinuity
  66. triangulation of GRB 030331 (single error box)
  67. GRB 030329: optical observations
  68. Photometry of GRB030329 - Constant OT Magnitude
  69. GRB030329 - OT brightens
  70. GRB 030329, optical photometry
  71. GRB 030324: Optical and NIR Observations
  72. GRB030329: R band light curve by MASTER
  73. GRB030329 - Light curve flattening
  74. GRB 030324, optical search
  75. GRB 030329, optical observations
  76. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  77. GRB030329a: detection by Konus-Wind
  78. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  79. GRB030329, BVRcIc field photometry
  80. GRB030329, SPM optical observations
  81. GRB 030329: Optical decay and synthesis
  82. GRB030329 optical observations
  83. GRB 030329: Optical pre-Imaging
  84. GRB 030329: Upper limit from 5.6 hours before trigger
  85. GRB030328: X-ray Afterglow Observed with Chandra
  86. GRB 030329, R-band observations
  87. GRB 030329: OT B and R photometry, decline rate
  88. GRB030329: Upper limits from recent and historical observations.
  89. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  90. GRB 030329: Optical Afterglow Observations
  91. GRB 030328: optical observations
  92. GRB 030329: Optical afterglow fading
  93. GRB 030328: OT photometry
  94. GRB030328: optical spectroscopy at TNG
  95. GRB030328: optical photometry at the TNG
  96. VLT spectra of GRB 030328
  97. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  98. GRB 030328: Optical observations
  99. GRB030324 optical observation
  100. GRB030131, BVRcIc field photometry

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