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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"

32534 results found.

  1. GRB030329: XMM-Newton observation
  2. GRB030324: Further Observations of the Candidate Optical Afterglow
  3. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  4. IPN triangulation of GRB030519B=H2716 (small error box)
  5. GRB 030418: Second Epoch Optical Observations with Magellan
  6. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  7. HETE GRB030329, correction to Rc Observations in Loiano
  8. GRB 030329: Optical limit (contemporaneous imaging)
  9. GRB 030501: final TAROT limits
  10. IPN triangulation of GRB030509 (small errror box)
  11. IPN triangulation of GRB030509 - correction
  12. GRB030329: RTT150 optical observations
  13. GRB030329, BVRI photometry
  14. GRB030429, refiend optical brightness
  15. GRB 030329: Optical limit (contemporaneous photography)
  16. GRB030418, BVRcIc field photometry
  17. GRB 030429: Redshift of neighbor galaxy
  18. GRB030429, BVRcIc field photometry
  19. GRB030429: RTT150 optical obs., correction to GCN 2208
  20. GRB 030329: High-Resolution Spectroscopy of the Host
  21. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  22. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  23. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  24. GRB030429: RTT150 optical observations, a possible host galaxy
  25. GRB030329: RTT150 optical observations and upper limit for a host
  26. GRB030501, optical observation
  27. GRB030501 observation report
  28. GRB030501 triangulation (correction to GCN 2194)
  29. GRB030329: RTT150 optical observations and upper limit for a host
  30. GRB 030429: Radio Observations
  31. GRB 030429: redshift from VLT spectroscopy
  32. GRB 030429: IR photometry with IRSF/SIRIUS
  33. GRB030501B triangulation (single error box)
  34. GRB 030329 Optical Observations
  35. GRB030328, optical observation
  36. GRB 030329, BVRI photometry
  37. GRB030429: Optical Observations
  38. GRB030501: TAROT candidate afterglow present in archival images
  39. GRB 030501: TAROT possible candidate counterpart
  40. IPN triangulation of GRB030501 (IBIS event; annulus)
  41. GRB 030429: confirmation of afterglow candidate
  42. GRB030425: CrAO optical observation
  43. GRB 030329 Oprical observations in Rozhen observatory
  44. GRB 030324: Radio Observations
  45. GRB030329 observed as a sudden ionospheric disturbance (SID)
  46. GRB030329, SPM optical observations
  47. GRB 030329, the review of the sky area in plate archive (1950-1998)
  48. GRB 030329: Spectral Evolution of SN 2003dh
  49. GRB 030329: optical spectropolarimetry at VLT
  50. GRB030329: optical polarization
  51. GRB030329, optical observation
  52. GRB030329: 444 AAVSO Measurements
  53. ROTSE-III prompt optical detections of GRB 030418
  54. GRB030418: Upper limits from recent and historical observations.
  55. GRB 030418: Optical afterglow
  56. GRB 030418: Finder for afterglow candidate
  57. GRB 030329 OT position
  58. GRB030329: Optical Observations
  59. OT GRB 030329: early UBVRcIc spectral evolution
  60. GRB030329, UBVRI polarimetry, R-polarization
  61. GRB 030329: SARA Optical Observations
  62. OT GRB 030329: early spectrum
  63. GRB030329: VR Photometry at TNG
  64. GRB030324: Candidate Optical Afterglow
  65. GRB 030413: Optical Observations
  66. GRB 030329 Rc observations
  67. Superluminal motion in GRB 030329 (Correction)
  68. Superluminal motion in GRB 030329
  69. GRB 030329 and SN 2003dh
  70. GRB030329, optical position
  71. GRB 030329 VLBA Observations
  72. GRB 030329: BVRI photometry at Asiago
  73. GRB 030329, light curve flattens
  74. GRB 030329: VLT V-band photometry
  75. If the SN/GRB connection confirmed
  76. GRB 030329: Supernova Confirmed
  77. GRB030329: RTT150 optical observations
  78. GRB030329: Near Infrared Observations at Gunma
  79. GRB030329: HET spectroscopic monitoring
  80. GRB 030329, color evolution
  81. GRB030328, UBVRcIc field photometry
  82. GRB030329: Optical observcations
  83. GRB030329: BV photographic observations
  84. GRB 030329 Optical observations
  85. GRB 030329, color evolution
  86. GRB 030329: possible color change
  87. GRB030329: RTT150 optical observations
  88. GRB 030329: Supernova Spectrum Emerging
  89. GRB030329: RTT150 optical observation
  90. GRB030329: More AAVSO VR obs
  91. GRB030328: R upper limit after 6 hours by MASTER
  92. GRB 030329: BV photographic observations
  93. GRB 030329: SARA Optical Observations
  94. GRB 030329: SARA Optical Observations
  95. GRB030329, fading resumes
  96. GRB 030329, BVRI photometry
  97. GRB030329: Optical observations
  98. SDSS 0.5m PT observations of GRB030329 (correction)
  99. SDSS 0.5m PT observations of GRB030329
  100. GRB 030329, Optical observations

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