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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"

20968 results found.

  1. GRB030329: XMM-Newton observation
  2. GRB 021004: HST observations
  3. GRB030324: Further Observations of the Candidate Optical Afterglow
  4. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  5. GRB 030418: Second Epoch Optical Observations with Magellan
  6. HETE GRB030329, correction to Rc Observations in Loiano
  7. GRB030329: RTT150 optical observations
  8. GRB030329, BVRI photometry
  9. GRB 030329: High-Resolution Spectroscopy of the Host
  10. GRB030429: RTT150 optical observations, a possible host galaxy
  11. GRB030329: RTT150 optical observations and upper limit for a host
  12. GRB030501, optical observation
  13. GRB030329: RTT150 optical observations and upper limit for a host
  14. GRB 030429: Radio Observations
  15. GRB 030429: IR photometry with IRSF/SIRIUS
  16. GRB 030329 Optical Observations
  17. GRB030429: Optical Observations
  18. GRB 030501: TAROT possible candidate counterpart
  19. GRB 030429: confirmation of afterglow candidate
  20. GRB030429, possible optical counterpart
  21. GRB 030329 Oprical observations in Rozhen observatory
  22. GRB 030429: ROTSE-III observations
  23. GRB 030324: Radio Observations
  24. GRB030329 observed as a sudden ionospheric disturbance (SID)
  25. GRB030329, SPM optical observations (Correction)
  26. GRB030329, SPM optical observations
  27. GRB 030329, the review of the sky area in plate archive (1950-1998)
  28. Optical Observations of GRB 030418 with Magellan
  29. GRB 030329: optical spectropolarimetry at VLT
  30. GRB030329: optical polarization
  31. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  32. MASTER:optical observations GRB030418
  33. MASTER:optical observations probable GRB030414
  34. GRB030329: 444 AAVSO Measurements
  35. MASTER:optical observations GRB030416
  36. ROTSE-III prompt optical detections of GRB 030418
  37. GRB030418: Upper limits from recent and historical observations.
  38. GRB030418: Kiso near infrared observations
  39. GRB 030418: Optical afterglow
  40. GRB 030418: Optical afterglow candidate
  41. GRB030329: Optical Observations
  42. OT GRB 030329: early UBVRcIc spectral evolution
  43. GRB030329, UBVRI polarimetry, R-polarization
  44. GRB 030329: SARA Optical Observations
  45. OT GRB 030329: early spectrum
  46. GRB030329: VR Photometry at TNG
  47. GRB 030413: Optical Observations
  48. GRB 030329 Rc observations
  49. GRB 030329 VLBA Observations
  50. GRB 030329: VLT V-band photometry
  51. GRB030329: RTT150 optical observations
  52. GRB030329: Near Infrared Observations at Gunma
  53. Kiso observation of the GRB030329 at April 6
  54. GRB030329: Optical observcations
  55. GRB030329: BV photographic observations
  56. GRB 030329 Optical observations
  57. GRB030329: RTT150 optical observations
  58. GRB030329: Kiso B and R band observations
  59. GRB030329: RTT150 optical observation
  60. GRB030329: More AAVSO VR obs
  61. GRB030328: R upper limit after 6 hours by MASTER
  62. GRB 030329: BV photographic observations
  63. GRB 030329: SARA Optical Observations
  64. GRB 030329: SARA Optical Observations
  65. GRB030329: Optical observations
  66. SDSS 0.5m PT observations of GRB030329 (correction)
  67. SDSS 0.5m PT observations of GRB030329
  68. GRB 030329, Optical observations
  69. GRB 030329, nearby galaxies
  70. GRB030329: final R-band light curve by MASTER
  71. GRB030329 - more 15 GHz radio data
  72. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  73. GRB 030329: Sub-millimeter detection
  74. GRB 030329: SARA Optical Observations
  75. GRB 030329: SARA Optical Observations
  76. GRB030329: optical observations at Tokyo Tech
  77. GRB 030329: optical observations
  78. GRB 030329, BRI photometry
  79. GRB 030329 , SPM optical observations
  80. GRB030329: Optical observations at Teramo
  81. GRB 030329: Radio observations at GMRT
  82. GRB030329: more 15GHz observations
  83. Further AAVSO V,B,R observations of GRB030329
  84. GRB 030329: Additional Mt. Laguna Optical Observations
  85. GRB 030329: SARA Optical Observations
  86. GRB 030329: Observations with ANDICAM
  87. GRB030329: Optical observations
  88. GRB030329: further optical photometry and evidence for a light curve discontinuity
  89. GRB 030329: Correction to GCN 2056
  90. GRB 030329: KAIT optical photometry
  91. GRB030329 Further RBO Optical Observations
  92. GRB 030329: SARA Optical Observations
  93. AAVSO V & R observations of GRB030329
  94. GRB 030329: optical observations
  95. GRB 030329: beginning of the new fading phase in optical band
  96. GRB 030329: optical photometry
  97. GRB030329: Optical observations
  98. Photometry of GRB030329 - Constant OT Magnitude
  99. GRB 030329, R-band observations
  100. GRB 030329: further optical observations

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